Segmented construction method for building large-span concrete continuous beam bridge by using movable formwork

Abstract

The invention relates to the technical field of bridge construction, and discloses a segmental construction method for constructing a large-span concrete continuous beam bridge by using a movable formwork, which comprises the following steps of: 1, constructing a first span and a tail span; step 2, middle span construction; 3, recording the state of the formwork; fourthly, the formwork moves forwards for crossing construction; 5, regular inspection is carried out; and step 6, construction recording and adjustment. According to the construction method, flexible switching among different construction stages is allowed through the design of the movable formwork, the construction team can be rapidly switched among different span sections through segmented construction, the pouring load of each section is effectively controlled, the mobility of the formwork enables the construction team to be rapidly switched among different span sections, the construction period is shortened, the efficiency is improved, and in the pouring process, the construction period is shortened. The formwork relieves slab staggering caused by construction joints by jacking the supporting leg oil cylinders, so that seamless connection between different sections and a concrete pouring space formed by formwork closing are guaranteed, it is guaranteed that concrete is evenly poured according to design requirements, and the beneficial effect that the movable formwork is used for pouring construction of a large-span bridge is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of bridge construction, in particular to a segmented construction method for building a large-span concrete continuous beam bridge using a mobile formwork. Background Art

[0002] Because of its low cost, mobile formwork bridge machine technology has become one of the most important bridge construction methods, but it is generally suitable for the whole span casting construction of simple supported or continuous beam bridges with a span of 20 meters to 55 meters, and the number of bridge holes is 15 to 30 per unit. For example, the existing patent publication number is CN105970822A, which is a 50m double-width upward mobile formwork and its corresponding beam construction method. The method steps are (1) assembling the formwork; (2) pre-pressing; (3) beam construction of the first span beam; (4) giving up the constructed pier position; (5) performing a primary force system conversion; (6) moving over the span; (7) performing a secondary force system conversion; (8) constructing the second span beam. This patent constructs the double-width bridge deck in an integral construction manner, effectively solving the problem caused by the small bridge deck spacing, and constructing in an integral construction manner to improve construction efficiency and speed up the construction process.

[0003] Another example is a self-propelled bridge casting work platform and its construction method with publication number CN118241570A, the construction method includes: S1, the bridge casting work platform is pouring and curing concrete in the n and n+1 pier spans, during which the integral steel cage is tied on the mobile tire frame on the cast beam surface at the rear; S2, the curing and tensioning of the concrete in the n and n+1 pier spans are completed, and the bridge casting work platform completes demoulding and opening of the mold; the beneficial effect of this patent is that the longest time-consuming steel bar tying process in bridge construction can be carried out simultaneously with the bridge casting, curing and tensioning processes, while simplifying the construction process and effectively improving the efficiency of mobile mold frame beam making workers.

[0004] Although the above documents are all existing technologies for improving bridge construction, the above materials are only suitable for the construction of bridges with a span of less than 60 meters. If a mobile formwork is used for the construction of a bridge with a span of more than 60 meters, the load and deadweight of the equipment will be very large, and the force on the bridge will also be very large, which is very uneconomical. In addition, the piers or bridges need to be temporarily reinforced during the construction process. However, the low cost of building bridges with mobile formwork is inherent. Once temporary reinforcement is used, the construction cost will be increased, and the economic expenditure will be greater. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a method for constructing a large-span concrete continuous beam bridge in sections using a mobile formwork. The method has the advantages of using a mobile formwork to cast and construct a large-span bridge and maintaining low cost under the condition of large-span construction. The method solves the problem in the prior art that if a mobile formwork is used to construct a bridge with a span of more than 60 meters, the load and deadweight borne by the equipment will be very large, the force acting on the bridge will also be very large, which is very uneconomical, and the bridge piers or bridges need to be temporarily reinforced during the construction process. However, the low cost of building a bridge using a mobile formwork is inherent. Once temporary reinforcement is used, the construction cost will be increased, resulting in greater economic expenditure.

[0006] To achieve the above object, the present invention provides the following technical solution: a method for constructing a long-span concrete continuous beam bridge in sections using a mobile formwork, comprising a formwork for constructing a bridge, and the construction method comprises the following steps:

[0007] Step 1, construction of the first and last spans: The formwork construction area No. 1 "beam section near the bridgehead pier" is constructed, and then the "middle span beam section" of area No. 2 is constructed. Before pouring the area adjacent to the middle pier, the front load-bearing leg cylinder is lifted to alleviate the misalignment caused by the construction joint. During the formwork construction process, the pouring of the 56-80m beam section is taken as the key control condition, and the formwork structure configuration is adopted to implement segmented construction, reducing the pouring load under the condition of a span of 70-100m;

[0008] Step 2, construction of the middle span: the formwork first constructs the 28-40m beam section of area 1, applies prestress to achieve self-sustaining, and then constructs the 42-60m beam section of area 2. The construction sequence of area 2 is: first cast the part of area 2 located behind area 1, and then cast the part behind area 2, to ensure that this section is seamlessly connected with the cast section, and jointly support the 70-100m span beam section, lift the front load-bearing leg cylinder and the rear load-bearing leg cylinder, and alleviate the misalignment between the cast-in-place beam section and the construction joint of the "beam section near the bridgehead pier" in area 1 and the cast beam section at the rear;

[0009] Step 3: Record the state of the formwork: record the state of the formwork during the construction of the 70-100m span, and analyze the load and stress distribution of different sections;

[0010] Step 4: Move the formwork forward to cross the span: close the formwork, pour concrete until it meets the design requirements. After pouring, release the jacking device between the formwork bed and the pier, lower the formwork 150-200mm to implement the formwork drop, and transport the rear load-bearing legs to the front end of the poured concrete beam in turn, and transport the front load-bearing legs to the top of the leading pier to ensure correct support, retract the front auxiliary leg cylinder, use the load-bearing leg longitudinal movement cylinder to push the formwork forward to the standard pouring position of the lower span, and push the mold hydraulic cylinder to close the formwork, and adjust the formwork bed to the pouring state;

[0011] Step 5. Regular inspection: After each stage of restraint, check the stability of the mold frame;

[0012] Step 6. Construction records and adjustments: record the construction status of each process.

[0013] Preferably, the concrete pouring working conditions are:

[0014] The weight of concrete is transmitted in sequence: formwork suspension, crank arm, main truss, load-bearing legs, lifting cylinders, and finally to the bridge deck and pier tops. During pouring, the formwork closes to form a concrete pouring space, so that concrete can be poured.

[0015] Preferably, the step 4 of moving the mold frame forward across the span construction also includes mold dropping, and the mold dropping working conditions are specifically as follows:

[0016] After releasing the tightening device between the mold bed and the bridge pier, all vertical constraints of the mold frame are removed. Under the action of the leg lifting oil jack, the entire mold bed is lowered 150-200mm as a whole to complete the mold dropping.

[0017] Preferably, the step four of moving the mold frame forward over the span construction also includes mold opening, and the mold opening working condition is: after the mold is dropped, the center seam bolts of the hanger rod, the hanging curved arm and the connecting bolts of the center seam of the bottom mold are removed, and all lateral constraints on the lateral movement of the mold frame are removed. Then, the mold opening hydraulic cylinder pushes the hanging curved arm and the outer mold plate to open outward to avoid the lateral space of the pier, and completes the mold opening work.

[0018] Preferably, the rear load-bearing legs are transported as follows: after the mold frame is opened and the main truss is longitudinally moved to the front auxiliary legs to reach the leading pier, the rear load-bearing legs, the front load-bearing legs and the front auxiliary legs are supported at three points, and the rear load-bearing legs are transported to the front end of the poured concrete beam for installation using the longitudinal movement cylinders of the rear load-bearing legs themselves; the front load-bearing legs are transported as follows: after the rear load-bearing legs are transported into place and installed, the rear auxiliary legs, the rear load-bearing legs and the front auxiliary legs are supported at three points, and the front load-bearing legs are transported to the leading pier and the column frame for installation and anchoring using the longitudinal movement cylinders of the front load-bearing legs themselves.

[0019] Preferably, after the reverse transportation is completed, the front auxiliary leg cylinder is retracted, and the longitudinal movement cylinders of the front load-bearing legs and the rear load-bearing legs are used to push the formwork forward to reach the standard casting position of the lower span, thereby completing the forward movement of the mobile formwork across the span.

[0020] Preferably, the closing of the template and the adjustment working conditions in step 4 are:

[0021] The mold opening hydraulic cylinder pushes the hanging crank arm inward to close, thereby driving the outer mold plate to close inward together. After closing, the connecting bolts of the center seam of the bottom mold, the center seam bolts of the hanging crank arm and the precision-rolled threaded hanger rod are connected. Finally, the entire mold bed is lifted into place under the action of the outrigger lifting cylinder, and the mold bed elevation and center line are adjusted to put the entire mold frame into the casting state.

[0022] Preferably, the construction process and construction period of the formwork movement are such that after one beam is constructed, the formwork moves to the next span beam for construction and the pouring of the concrete beam of the span is completed. The entire process is designed as a standard operation cycle.

[0023] Preferably, when constructing the 28-40m beam section in area No. 1, the formwork is supported by the front auxiliary legs, the front load-bearing legs and the rear load-bearing legs, wherein the front auxiliary legs and the front load-bearing legs are supported on the front and middle bridge piers, and the rear load-bearing legs are supported on the rear poured beam surface. The formwork is suspended on the cantilever beam and the main beam through the hanging crank arm and the hanging rod. The beam section within the span is cast first, and then the cantilever end is cast. The casting is divided into longitudinal sections and horizontal layers.

[0024] After the construction of the beam section in area No. 1 is completed, the formwork is moved to drop the mold and open the mold, then retreat 28-40 meters to adjust the mold bed posture to construct the first span 56-80 meter beam section or the middle span 42-60 meter beam section in area No. 2. At this time, the formwork is supported by the front load-bearing legs and the rear load-bearing legs. Finally, before pouring the beam section in the area near the construction joint, the leg support cylinder needs to be lifted upward.

[0025] Preferably, after the construction of the beam section in area No. 2 is completed and the overall tensioning is completed, the mobile formwork is moved forward across the span according to the conventional formwork over-span process to start the construction of the next span of the bridge.

[0026] Preferably, the formwork in the present application is a prior art as a necessary equipment for bridge construction and has been disclosed in the documents cited in the background technology, so the principle of the formwork construction of the present application will not be described in detail.

[0027] Compared with the prior art, the present invention provides a method for constructing a large-span concrete continuous beam bridge in sections using a mobile formwork, which has the following beneficial effects:

[0028] 1. The present invention allows flexible switching between different construction stages through the design of a mobile formwork, which is conducive to segmented construction. Through segmented construction, the pouring load of each section can be effectively controlled, reducing the overall construction risk. The mobility of the formwork enables the construction team to quickly switch between different spans, shortening the construction period and improving efficiency. During the pouring process, the formwork alleviates the misalignment caused by the construction joint by lifting the outrigger cylinder, thereby ensuring seamless connection between different sections. The concrete pouring space formed by the closed formwork ensures that the concrete is poured evenly according to the design requirements, preventing To prevent uneven solidification of concrete or structural defects, the longitudinal segmentation and horizontal layered pouring methods are adopted to ensure the strength and stability of each layer during the pouring process and avoid potential construction risks. The formwork adopts the mold dropping and opening process, which enables the formwork to be quickly evacuated from the poured section after the pouring is completed, reducing the impact on subsequent construction. The reverse transportation mechanism of the rear load-bearing leg cylinder and the front load-bearing leg cylinder ensures the stability of the structure and the accuracy of the support, which promotes the rapid preparation of the formwork before a new round of construction, and achieves the beneficial effect of using mobile formwork for the pouring construction of large-span bridges.

[0029] 2. The present invention can quickly complete the pouring of different sections through the movable formwork design, reducing the construction time. During construction, the pouring of each section and the movement of the formwork can be completed quickly, significantly reducing labor costs and equipment rental costs. The design of the formwork allows the formation of a closed concrete space during the pouring process, thereby maximizing the use efficiency of concrete and reducing waste. The mobile formwork structure can be quickly moved to the next section after completing one section of construction, reducing the need to produce new formworks, thereby saving materials and manufacturing costs. The mobile formwork is suitable for bridges of different spans and shapes. When project requirements change, the construction plan can be quickly adjusted to avoid large-scale rework caused by design modifications, thereby maintaining low costs and achieving the beneficial effect of maintaining low costs in large-span construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the steps of the present invention;

[0031] Figure 2 A schematic diagram of the states of the No. 1 area and the No. 2 area when the first span of the continuous beam bridge is constructed according to the present invention;

[0032] Figure 3 A schematic diagram of the states of area No. 1 and area No. 2 when constructing the middle span of the continuous beam bridge according to the present invention;

[0033] Figure 4 This is a schematic diagram of the construction status of the first and last spans of the mobile formwork in Example 1;

[0034] Figure 5 This is a schematic diagram of the construction state of the middle span of the mobile formwork in Example 1;

[0035] Figure 6 It is a schematic diagram of the steps of moving the mold frame across;

[0036] Figure 7 This is a schematic diagram of the pouring working condition of the rear load-bearing outrigger cylinder;

[0037] Figure 8 This is a schematic diagram of the mold opening working condition of the front load-bearing leg cylinder. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] Embodiment 1

[0040] A method for constructing a long-span concrete continuous beam bridge in sections using a mobile formwork, comprising a formwork for constructing the bridge, and the construction method comprises the following steps:

[0041] Step 1, construction of the first and last spans: The formwork first constructs the No. 1 area "beam section near the bridgehead pier", and then constructs the No. 2 area "middle span beam section". Before pouring the area adjacent to the middle pier, lift the front load-bearing leg cylinder to alleviate the misalignment caused by the construction joint. During the formwork construction process, the pouring of the 56-meter beam section is taken as the key control condition, and the formwork structure configuration is adopted to implement segmented construction to reduce the pouring load under the condition of a 70-meter span;

[0042] Step 2, construction of the middle span: The formwork first constructs the 28-meter beam section of area 1, applies prestress to achieve self-sustaining, and then constructs the 42-meter beam section of area 2. The construction sequence of area 2 is: first cast the part of area 2 located behind area 1, and then cast the part behind area 2, ensuring that this section is seamlessly connected with the cast section to jointly support the 70-meter span beam section, and lift the front load-bearing leg cylinder and the rear load-bearing leg cylinder;

[0043] Step 3: Record the state of the formwork: record the state of the formwork during the 70-meter span construction and analyze the load and stress distribution of different sections;

[0044] Step 4: Move the formwork forward to cross the span: close the formwork, pour concrete until it meets the design requirements. After pouring, release the jacking device, lower the formwork 150-200mm to implement the formwork, and then transport the rear load-bearing legs to the front end of the poured concrete beam, and transport the front load-bearing legs to the top of the leading pier to ensure correct support. Retract the front auxiliary leg cylinder, use the load-bearing leg longitudinal movement cylinder to push the formwork forward to the standard pouring position of the lower span, and push the mold hydraulic cylinder to close the formwork, and adjust the mold bed to the pouring state;

[0045] Step 5. Regular inspection: After each stage of restraint, check the stability of the mold frame;

[0046] Step 6. Construction records and adjustments: record the construction status of each process.

[0047] Span and beam length: 70m span, 56m key beam. The larger span effectively disperses the load, while the longer key beam can optimize the anchorage and stress distribution of the concrete.

[0048] Adjustment of the outrigger cylinder: Lifting the outrigger cylinder can effectively alleviate the misalignment caused by the construction joint, maintain the overall horizontality and verticality, and reduce the stress concentration caused by the construction joint.

[0049] Reduced pouring load: The formwork structure configuration is used to achieve segmented construction, which effectively reduces the pouring load of the beam section and improves the overall stability. Under the condition of a span of 70 meters, the pouring pressure of the concrete is more uniform, reducing the risk of cracking.

[0050] Through segmented construction, the pouring load of each section can be effectively controlled and the overall construction risk can be reduced. The mobility of the formwork enables the construction team to quickly switch between different spans, shortening the construction period and improving efficiency. During the pouring process, the formwork alleviates the misalignment caused by the construction joint by lifting the outrigger cylinder, thereby ensuring seamless connection between different sections. The concrete pouring space formed by the closure of the formwork ensures that the concrete is poured evenly according to the design requirements and prevents uneven concrete solidification or structural defects. The longitudinal segmentation and horizontal layered pouring methods are adopted to ensure the strength and stability of each layer during the pouring process and avoid potential construction risks. The drop and open mold process adopted by the formwork enables the formwork to be quickly evacuated from the poured section after the pouring is completed, reducing the impact on subsequent construction. The reverse transportation mechanism of the rear load-bearing outrigger cylinder and the front load-bearing outrigger cylinder ensures the stability of the structure and the accuracy of the support, and promotes the rapid preparation of the formwork before a new round of construction.

[0051] Embodiment 2

[0052] A method for constructing a long-span concrete continuous beam bridge in sections using a mobile formwork, comprising a formwork for constructing the bridge, and the construction method comprises the following steps:

[0053] Step 1, construction of the first and last spans: construct the formwork of the "beam section near the bridgehead pier" in area No. 1, and then construct the "middle span beam section" in area No. 2. Before pouring the area adjacent to the middle pier, lift the front load-bearing leg cylinder to alleviate the misalignment caused by the construction joint. During the formwork construction process, the pouring of the 80-meter beam section is taken as the key control condition, and the formwork structure configuration is adopted to implement segmented construction to reduce the pouring load under the condition of a span of 100 meters;

[0054] Step 2, construction of the middle span: The formwork first constructs the 40-meter beam section of area 1, applies prestress to achieve self-sustaining, and then constructs the 60-meter beam section of area 2. The construction sequence of area 2 is: first cast the part of area 2 located behind area 1, and then cast the part behind area 2, ensuring that this section is seamlessly connected with the cast section to jointly support the 100-meter span beam section, and lift the front load-bearing leg cylinder and the rear load-bearing leg cylinder;

[0055] Step 3: Record the state of the formwork: record the state of the formwork during the construction of the 100-meter span, and analyze the load and stress distribution of different sections;

[0056] Step 4: Move the formwork forward to cross the span: close the formwork, pour concrete until it meets the design requirements. After pouring, release the jacking device, lower the formwork 150-200mm to implement the formwork, and then transport the rear load-bearing legs to the front end of the poured concrete beam, and transport the front load-bearing legs to the top of the leading pier to ensure correct support. Retract the front auxiliary leg cylinder, use the load-bearing leg longitudinal movement cylinder to push the formwork forward to the standard pouring position of the lower span, and push the mold hydraulic cylinder to close the formwork, and adjust the mold bed to the pouring state;

[0057] Step 5. Regular inspection: After each stage of restraint, check the stability of the mold frame;

[0058] Step 6. Construction records and adjustments: record the construction status of each process.

[0059] Span and beam section length: 100-meter span, 80-meter key beam section. Under the span of 100 meters, the distribution of pouring pressure will be more uniform, which will help reduce the risk of cracking and stress concentration caused by construction joints. Under larger spans, it can still effectively maintain horizontal and vertical degrees and reduce misalignment. The height and adjustment of the outrigger cylinders can enhance the stability of the formwork. The 80-meter beam section means that construction joints are reduced and continuity is enhanced during the construction process. The construction efficiency is improved through the optimized configuration of the formwork. Due to the better configuration of the formwork structure, the pouring load is reduced, the overall performance is improved, and the construction time is reduced. The larger span and long beam section improve the stability of the construction. Compared with the first embodiment, the second embodiment shows more superior bearing capacity and structural stiffness in dealing with multiple index effects in large spans. The pouring load can be effectively controlled during the construction process, which helps to improve the overall stability and safety of the project.

[0060] Adjustment of the outrigger cylinder: Lifting the outrigger cylinder can effectively alleviate the misalignment caused by construction joints under larger spans and maintain the overall horizontality and verticality.

[0061] Reduction of pouring load: Segmented construction is achieved through formwork structure configuration, which can effectively reduce the pouring load under large span conditions and improve the stability of the beam section. In a span of 100 meters, the concrete pouring pressure is more uniform, further reducing the risk of cracking.

[0062] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations may be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for constructing a long-span concrete continuous beam bridge in sections using a mobile formwork, comprising a formwork for constructing a bridge, characterized in that: The construction method comprises the following steps: Step 1, construction of the first and last spans: The formwork construction area No. 1 "beam section near the bridgehead pier" is constructed, and then the No. 2 area "middle span beam section" is constructed. Before pouring the area adjacent to the middle pier, the front load-bearing leg cylinder is lifted to alleviate the misalignment caused by the construction joint. During the formwork construction process, the pouring of the 56-80m beam section is taken as the key control condition, and the formwork structure configuration is adopted to implement segmented construction, reducing the pouring load under the condition of 70-100m span; Step 2, construction of the middle span: the formwork first constructs the 28-40m beam section of area 1, applies prestress to achieve self-sustaining, and then constructs the 42-60m beam section of area 2. The construction sequence of area 2 is: first cast the part of area 2 located behind area 1, and then cast the part behind area 2, to ensure that this section is seamlessly connected with the cast section, and jointly support the 70-100m span beam section, lift the front load-bearing leg cylinder and the rear load-bearing leg cylinder, and alleviate the misalignment between the cast-in-place beam section and the construction joints of the "beam section near the bridgehead pier" in area 1 and the cast-in-place beam section at the rear; Step 3: Record the state of the formwork: record the state of the formwork during the construction of the 70-100m span, and analyze the load and stress distribution of different sections; Step 4: Move the formwork forward to cross the span: close the formwork, pour concrete until it meets the design requirements. After pouring, release the jacking device between the formwork bed and the pier, lower the formwork 150-200mm to implement the formwork drop, and transport the rear load-bearing legs to the front end of the poured concrete beam in turn, and transport the front load-bearing legs to the top of the leading pier to ensure correct support, retract the front auxiliary leg cylinder, use the load-bearing leg longitudinal movement cylinder to push the formwork forward to the standard pouring position of the lower span, and push the mold hydraulic cylinder to close the formwork, and adjust the formwork bed to the pouring state; Step 5. Regular inspection: After each stage of restraint, check the stability of the mold frame; Step 6. Construction records and adjustments: record the construction status of each process.

2. The method for constructing a long-span concrete continuous beam bridge in sections using a mobile formwork according to claim 1 is characterized in that: The concrete pouring working conditions are: The weight of concrete is transmitted in sequence: formwork suspension, crank arm, main truss, load-bearing legs, lifting cylinders, and finally to the bridge deck and pier tops. During pouring, the formwork closes to form a concrete pouring space, so that concrete can be poured.

3. The method for constructing a long-span concrete continuous beam bridge in sections using a mobile formwork according to claim 2, characterized in that: The step 4 of the mold frame moving forward over the span construction also includes mold dropping, and the mold dropping working conditions are specifically as follows: After releasing the tightening device between the mold bed and the bridge pier, all vertical constraints of the mold frame are removed. Under the action of the leg lifting oil jack, the entire mold bed is lowered 150-200mm as a whole to complete the mold dropping.

4. The method for constructing a long-span concrete continuous beam bridge in sections using a mobile formwork according to claim 3 is characterized in that: The step 4 of the mold frame moving forward over the span construction also includes mold opening, and the mold opening working condition is: After the mold is dropped, the center seam bolts of the hanger and hanging curved arm and the connecting bolts of the center seam of the bottom mold are removed, and all lateral constraints on the lateral movement of the mold frame are cleared. Then the mold opening hydraulic cylinder pushes the hanging curved arm and the outer mold plate outward to avoid the lateral space of the pier and complete the mold opening work.

5. The method for constructing a long-span concrete continuous beam bridge in sections using a mobile formwork according to claim 4, characterized in that: The rear load-bearing legs are transported as follows: after the mold frame is opened and the main truss is longitudinally moved to the front auxiliary legs to reach the leading pier, the rear load-bearing legs, the front load-bearing legs and the front auxiliary legs are used to support the legs, and the longitudinal movement cylinders of the rear load-bearing legs are used to transport the rear load-bearing legs to the front end of the poured concrete beam for installation. The front load-bearing legs are transported as follows: after the rear load-bearing legs are transported into place and installed, the rear auxiliary legs, the rear load-bearing legs and the front auxiliary legs are used to support the legs, and the longitudinal movement cylinders of the front load-bearing legs are used to transport the front load-bearing legs to the leading pier and the column frame for installation and anchoring.

6. The method for constructing a long-span concrete continuous beam bridge in sections using a mobile formwork according to claim 5, characterized in that: After the reverse transportation is completed, the front auxiliary outrigger oil cylinder is retracted, and the longitudinal movement cylinders of the front load-bearing outrigger oil cylinder and the rear load-bearing outrigger oil cylinder are used to push the formwork forward to reach the standard casting position of the lower span, thereby completing the forward movement of the mobile formwork across the span.

7. The method for constructing a long-span concrete continuous beam bridge in sections using a mobile formwork according to claim 5, characterized in that: The closing formwork and adjustment conditions in step 4 are as follows: The mold opening hydraulic cylinder pushes the hanging crank arm inward to close, thereby driving the outer mold plate to close inward together. After closing, the connecting bolts of the center seam of the bottom mold, the center seam bolts of the hanging crank arm and the precision-rolled threaded hanger rod are connected. Finally, the entire mold bed is lifted into place under the action of the outrigger lifting cylinder, and the mold bed elevation and center line are adjusted to put the entire mold frame into the casting state.

8. The method for constructing a long-span concrete continuous beam bridge in sections using a mobile formwork according to claim 7, characterized in that: The construction process and construction period of the formwork movement are as follows: after completing the construction of one beam, the formwork moves to the next span beam for construction, and the pouring of the concrete beam of this span is completed. The entire process is designed as a standard operation cycle.

9. The method for constructing a long-span concrete continuous beam bridge in sections using a mobile formwork according to claim 8, characterized in that: When constructing the 28-40m beam section in area No. 1, the formwork is supported by the front auxiliary legs, the front load-bearing legs and the rear load-bearing legs, wherein the front auxiliary legs and the front load-bearing legs are supported on the front and middle bridge piers, and the rear load-bearing legs are supported on the rear poured beam surface. The formwork is suspended on the cantilever beam and the main beam through the hanging arm and the hanging rod. The beam section within the span is poured first, and then the cantilever end is poured. The pouring is carried out in sections longitudinally and layers horizontally. After the construction of the beam section in area No. 1 is completed, the formwork is moved to drop the mold and open the mold, then retreat 28-40 meters to adjust the mold bed posture to construct the first span 56-80 meter beam section or the middle span 42-60 meter beam section in area No.

2. At this time, the formwork is supported by the front load-bearing legs and the rear load-bearing legs. Finally, before pouring the beam section in the area near the construction joint, the leg support cylinder needs to be lifted upward.

10. The method for constructing a long-span concrete continuous beam bridge in sections using a mobile formwork according to claim 9, characterized in that: After the construction of the beam section in area No. 2 is completed and the overall tensioning is completed, the mobile formwork is moved forward across the span according to the conventional formwork crossing process to start the construction of the next span of the bridge.

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