A hanging basket cantilever pouring material system and method for large-section cable-stiffened integrated continuous rigid frame

Abstract

The application belongs to the technical field of large-section railway bridge hanging basket cantilever pouring construction, and particularly relates to a large-section cable stiffening integrated continuous rigid frame hanging basket cantilever pouring material distribution system and method. The system comprises: a middle intermediate hopper fixedly installed on the top of a segmental beam body to be poured; at least two groups of web hopper, which are arranged above the top of the webs on the two sides of the segmental beam body to be poured; at least two groups of web material distribution windows, which are arranged on the web inner molds on the two sides of the beam body in pairs; an openable and closable pressing bin plate, which is arranged at the chamfer position where the bottom plate of the beam body and the web are connected; web manholes, which are arranged in pairs at the end formwork of the web; and a material distribution pipeline assembly, which comprises a rigid material distribution pipeline and a flexible material distribution member. The application effectively reduces the free falling height of concrete, transports the concrete to the designated pouring area, and reduces the segregation risk.

Description

Technical Field

[0001] This invention belongs to the field of cantilever casting construction technology for large-section railway bridge hanging baskets, specifically a material placement system and method for cantilever casting of large-section cable-stiffened integrated continuous rigid frame hanging baskets. Background Technology

[0002] With the rapid development of my country's high-speed railway industry, noise pollution generated by high-speed train operation has become a core issue in environmental governance along the railway lines. Relying on the Chengkou Renhe Grand Bridge project of the Xi'an-Chongqing High-speed Railway, the project innovatively adopts a large-span cable-stiffened bridge-screen integrated continuous rigid frame structure, placing the train operation area in the main beam box chamber, so that the main beam has the dual functions of structural load-bearing and fully enclosed sound barrier.

[0003] For the cantilever casting construction of such ultra-large cross-section beams using hanging baskets, existing conventional processes have many technical problems: excessive free fall height of concrete can easily cause segregation; uneven distribution of concrete between the web and the base plate; poor precision in controlling the casting thickness; concrete heaving in the base plate during web casting; and low construction efficiency due to the inability to cast multiple areas simultaneously. These problems not only affect the appearance quality and concrete strength of the beam, but also reduce the structural bearing capacity and shorten the service life of the structure under long-term alternating loads from trains and natural environmental erosion, posing potential risks to the safe operation of high-speed railways.

[0004] To completely solve the aforementioned technical problems, this invention has developed a cantilevered concrete placement system adapted to large-section cable-stiffened bridge panels, which can simultaneously improve both concrete pouring efficiency and forming quality. The development and application of this system is of significant practical importance for ensuring the construction quality of high-speed railway bridge projects and improving the safety and stability of high-speed railway operations. It can also promote the high-quality development of high-speed railway bridge construction technology in my country and enhance my country's core competitiveness in the international high-speed railway construction field. Summary of the Invention

[0005] To address the aforementioned problems, this invention provides a cantilever casting and placement system and method for large-section cable-stiffened integrated continuous rigid frame hanging baskets.

[0006] This invention adopts the following technical solution: a cantilever casting and placement system for large-section cable-stiffened bridge screen integrated continuous rigid frame, comprising: An intermediate material hopper is fixedly installed on the top of the beam segment to be poured. The discharge end of the intermediate material hopper is provided with multiple discharge pipes with opening and closing control devices. The discharge ends of the multiple discharge pipes correspond to the bottom plate pouring area of ​​the beam and the inlet end of each set of web plate receiving hoppers, respectively, to divert the pumped concrete to different pouring areas. At least two sets of web plate receiving hoppers are provided, with the two sets of web plate receiving hoppers located directly above the web plates on both sides of the top of the beam segment to be poured. The discharge end of each set of web plate receiving hoppers is connected to a concrete conveying device that extends vertically into the web plate, which is used to directly convey concrete to the upper pouring area of ​​the web plate. At least two sets of web plate fabric windows are provided, and the web plate fabric windows are opened in pairs on the inner web plate molds on both sides of the beam. Each set of web plate fabric windows is equipped with a detachable sealing cover. An openable pressure plate is provided at the chamfered position where the bottom plate of the beam connects with the web plate. The pressure plate is connected to the inner mold structure through adjustable support components to realize the opening and closing control of the pressure plate. Web plate entry holes are provided in pairs at the end templates of the web plate, and the web plate entry holes are equipped with sealing and plugging covers. The material placement pipeline assembly includes a rigid material placement pipe and a flexible material placement component. The inlet end of the rigid material placement pipe is connected to the outlet end of the intermediate material hopper, and the inlet end of the flexible material placement component is connected to the rigid material placement pipe. The outlet end of the flexible material placement component corresponds to the web material placement window and the core casting area of ​​the beam bottom plate, respectively, to achieve precise layered material placement of the bottom plate and the web plate.

[0007] In some embodiments, an intermediate material hopper is located in the central area of ​​the beam top in both longitudinal and transverse directions. The intermediate material hopper includes a lifting ring, a feeding hopper, a receiving hopper cover plate, and multiple discharge steel pipes. The lifting ring is fixed to the top of the feeding hopper. The feeding hopper adopts a tapered structure that is wider at the top and narrower at the bottom. The upper ends of the multiple discharge steel pipes are connected to the discharge port of the feeding hopper, and the lower ends penetrate the top plate of the beam and extend into the box girder. The receiving hopper cover plate is correspondingly installed at the upper end of each discharge steel pipe, constituting the opening and closing control component of the discharge pipeline.

[0008] In some embodiments, the material distribution pipeline assembly further includes multiple steel pipe elbows, which are fixed to the inner formwork truss and can move forward synchronously with the hanging basket; the upper end of the steel pipe elbow is connected to the discharge steel pipe of the intermediate material hopper, and the lower end is connected to the rigid material distribution pipe or the flexible material distribution component; the lower end of the discharge steel pipe extends into the steel pipe elbow, and the two are connected in a non-rigid manner.

[0009] In some embodiments, the rigid fabric placement tube includes at least two steel pipes, which are respectively disposed at corresponding positions on both sides of the web of the beam. The upper end of the steel pipe is rigidly connected to a steel pipe elbow, and the lower end is connected to a steel wire hose. The steel wire hose constitutes the flexible fabric placement component, and its outlet end can extend into the fabric placement window of the web to place the fabric.

[0010] In some embodiments, the flexible fabric component includes at least two steel wire hoses connected to steel pipe elbows. The upper ends of the steel wire hoses are rigidly connected to the steel pipe elbows, and the lower ends can extend into the web fabric window at the lower part of the web or extend to the casting area of ​​the bottom plate of the beam.

[0011] In some embodiments, the web receiving hopper adopts a tapered structure that is wider at the top and narrower at the bottom. The web receiving hopper is fixed to the top layer of the steel mesh of the beam. The concrete conveying component is a concrete conveying hose, which extends vertically into the pouring area inside the web.

[0012] In some embodiments, at least two web casting windows are provided on the inner formwork of each side of the beam, corresponding to the lower casting area and the middle casting area of ​​the web, respectively; the sealing cover of the web casting window includes a sealing steel plate, a square tube flat beam and a top screw, the size of the sealing steel plate matches the opening size of the web casting window, the square tube flat beam is clamped on the outside of the web template, and the top screw passes through the square tube flat beam and presses against the sealing steel plate to achieve the sealing and fixing of the cover.

[0013] In some embodiments, the pressure plate is made of steel formwork and is arranged longitudinally along the pouring surface; the pressure plate is in the open state during the bottom slab concrete pouring stage, and in the closed and locked state after the bottom slab is poured and before the web is poured.

[0014] In some embodiments, at least one web entry hole is reserved at the end template of each side of the web of the beam. The height of the web entry hole is matched with the operational requirements of the web concrete vibration operation. The sealing cover plate of the web entry hole is detachably and sealed to the end template.

[0015] A method for cantilever casting and placement of formwork for integrated continuous rigid frames with cable stiffeners on large cross-sections includes the following steps: S1: Install and open the steel pipe elbow, rigid placing pipe, flexible placing component, web placing window, pressure plate, adjusting support component and web manhole in place so that the above components can move forward synchronously with the hanging basket. S2: Use lifting equipment to hoist the intermediate connecting hopper and the web connecting hopper to the preset position of the beam segment to be poured and fix them; S3: The concrete is pumped to the intermediate hopper. The concrete is then transported to the bottom slab pouring surface via the intermediate hopper, steel pipe elbow, and corresponding flexible material placing device. The workers use the swinging flexible material placing device to evenly distribute the concrete to the bottom slab. After the bottom slab concrete is poured and finished, the pressure plate is closed by adjusting the support components to back-pressure seal the bottom slab concrete. S4: Layered pouring of web concrete: S41: Connect the flexible fabric piece for the bottom plate to the web plate fabric window of the lower layer of the web plate, and pour the lower layer of web plate concrete. The workers enter the web plate through the web plate manhole to vibrate the concrete. After the lower layer of web plate concrete is poured, remove the flexible fabric piece and close the lower layer web plate fabric window. S42: Concrete is fed through the intermediate hopper, steel pipe elbow, rigid placing pipe and corresponding flexible placing component, and then connected to the upper web placing window of the web plate to pour the middle layer of concrete in the web plate. After the pouring is completed, the flexible placing component is removed and the upper web plate placing window is closed. S43: Concrete is pumped to the web receiving hopper and then transported to the top layer of the web via a concrete conveying device to complete the top layer concrete pouring. S5: After the web plate is poured, remove the intermediate material receiving hopper and the web plate material receiving hopper, and pour the top slab concrete of the beam to complete the pouring operation of a single segment of the beam.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. Effectively reduce the free fall height of concrete. Through the rational design of the tremie pipe and the placing pipe, the concrete is transported to the designated pouring area, reducing the risk of segregation and ensuring the quality of concrete.

[0017] 2. To achieve simultaneous material distribution in multiple areas, the diversion function of the intermediate material receiving hopper and the web plate material receiving hopper, combined with valve cover plate control, significantly improves pouring efficiency and shortens construction time.

[0018] 3. To solve the problem of concrete backflow, an openable pressure plate is installed to seal the bottom slab in a timely manner after its pouring, preventing concrete backflow during subsequent web pouring and ensuring the appearance quality of the beam.

[0019] 4. Improve the uniformity of the fabric distribution. With the help of the fine fabric distribution design of the web fabric distribution window and steel wire hose, the web casting range can be accurately covered, avoiding strength defects caused by uneven fabric distribution.

[0020] 5. Enhanced construction convenience and continuity: The placing pipe, pressure plate, and manhole are all designed to move forward synchronously with the hanging basket, reducing the frequency of disassembly and assembly, optimizing the work process, and improving overall construction efficiency.

[0021] 6. Balancing sealing and functionality, the web panel fabric windows and access holes are equipped with special covers to effectively prevent grout leakage while meeting construction requirements and ensuring the integrity of the formwork system. Attached Figure Description

[0022] Figure 1 Schematic diagram of concrete placement system for cantilevered formwork casting; Figure 2 Front view of the cantilever concrete placement system for hanging basket casting; Figure 3Side view of the cantilever casting and placing system; Figure 4 This is a detailed drawing of the intermediate feed hopper; Figure 5 This is a detailed view of the web window; In the diagram: 1-Top plate middle receiving hopper, 2-φ300 steel pipe elbow, 3-Web plate receiving hopper, 4-φ200 water hose, 5-Steel pipe, 6-Steel wire hose, 7-Steel wire hose, 8-Web plate window, 9-Pressure plate, 10-Pressure plate adjustment support, 11-Web plate entrance hole. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are some embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] This embodiment provides a cantilever casting and placement system for large-section cable-stiffened bridge screen integrated continuous rigid frame hanging baskets, which is core-adapted to the large-span cable-stiffened bridge screen integrated continuous rigid frame structure used in the Chengkou Renhe Grand Bridge project of the Xi'an-Chongqing High-speed Railway. This structure sets the train travel area inside the main beam box chamber. The main beam structure has the dual functions of structural load-bearing and fully enclosed sound barrier. Its main beam adopts an ultra-large cross-section design, with a beam height of 11m and a beam width of 15.4m. Addressing the core pain points of cantilever casting construction of such ultra-large cross-section beams, the core construction scheme of "window opening in the inner formwork of the continuous rigid frame web" is adopted. This can effectively solve industry problems such as excessive free fall height of concrete, uneven placement and excessive thickness of material, slurry heaving of web concrete, and slow casting efficiency in traditional processes.

[0025] I. System Overall Structure This fabric distribution system includes an intermediate feed hopper 1, at least two sets of web feed hoppers 3, a fabric distribution pipeline assembly, at least two sets of web fabric distribution windows 8, an openable pressure plate 9, and a web inlet 11.

[0026] The intermediate material receiving hopper 1 is fixedly installed on the top of the beam segment to be poured. The discharge end of the intermediate material receiving hopper 1 is provided with multiple discharge pipes with opening and closing control devices. The discharge ends of the multiple discharge pipes correspond to the bottom plate pouring area of ​​the beam and the inlet end of each set of web plate receiving hoppers 3, respectively, to divert the pumped concrete to different pouring areas and realize multi-area synchronous material distribution.

[0027] The two sets of web receiving hoppers 3 are respectively located directly above the webs on both sides of the top of the beam segment to be poured. The discharge end of each set of web receiving hoppers 3 is connected to a concrete conveying device that extends vertically into the web, which is used to directly convey the concrete to the upper pouring area of ​​the web to avoid concrete spillage or segregation during the pouring process.

[0028] The web plate fabric windows 8 are opened in pairs on the inner web plate molds on both sides of the beam. Each set of web plate fabric windows 8 is equipped with a detachable sealing cover plate, which not only meets the fabric placement requirements, but also avoids grout leakage during pouring.

[0029] The openable pressure plate 9 is arranged at the chamfer position where the bottom plate of the beam connects with the web. The pressure plate 9 is connected to the inner mold structure through the adjustable support member 10 to realize the opening and closing control of the pressure plate 9, which can effectively avoid the bottom plate concrete from turning over during the web pouring process.

[0030] The web plate access holes 11 are opened in pairs at the end templates of the web plate, and the web plate access holes 11 are equipped with sealing cover plates to balance the convenience of personnel passage and the sealing of the template.

[0031] The material placement pipeline assembly includes a rigid material placement pipe and a flexible material placement component. The rigid material placement pipe is fixed to the inner formwork truss structure of the hanging basket and adopts a recyclable design, which can move forward synchronously with the hanging basket without frequent disassembly and assembly. The inlet end of the rigid material placement pipe is connected to the outlet end of the intermediate material hopper 1, and the inlet end of the flexible material placement component is connected to the rigid material placement pipe. The outlet end of the flexible material placement component corresponds to the web material placement window 8 and the core casting area of ​​the beam bottom plate, respectively, to achieve precise layered material placement of the bottom plate and the web plate.

[0032] II. Specific Implementation Structure of Each Core Component Intermediate hopper 1: The intermediate receiving hopper 1 is located in the central area of ​​the beam in both longitudinal and transverse directions at the top of the beam. There are no continuous prestressed pipes inside the beam in this area, which provides the conditions for its installation. The receiving hopper is installed and fixed as a whole to the top layer of steel mesh of the beam.

[0033] The intermediate receiving hopper 1 includes a lifting ring 1.3, a feeding hopper 1.4, a receiving hopper cover plate 1.1, and multiple discharge steel pipes 1.2. The lifting ring 1.3 is fixed to the top of the feeding hopper 1.4 and is used to cooperate with cranes, tower cranes, and other lifting equipment to complete the installation and removal of the receiving hopper. The feeding hopper 1.4 adopts a rectangular converging structure that is wider at the top and narrower at the bottom to ensure smooth concrete falling and avoid pipe blockage. Four φ200mm discharge steel pipes 1.2 are arranged below the feeding hopper 1.4. The discharge steel pipes 1.2 penetrate the top plate of the beam and extend to the inner box of the box girder, with the ends corresponding to the preset material placement areas of the web and bottom plate, respectively. The receiving hopper cover plates 1.1 are correspondingly set at the upper ends of each discharge steel pipe 1.2, forming the opening and closing control components of the discharge pipeline. During concrete pouring, the operators can open the receiving hopper cover plates 1.1 of the corresponding areas as needed to achieve precise material placement in the web and bottom plate areas.

[0034] Three of the discharge steel pipes 1.2 correspond to the inlet end of the bottom plate casting area and the material receiving hoppers 3 on both sides of the web plate, respectively. The on / off control of each discharge steel pipe 1.2 is achieved through the material receiving hopper cover plate 1.1. The remaining discharge steel pipe 1.2 is connected to the material distribution pipeline assembly and is used for layered casting and material distribution of the web plate.

[0035] Steel pipe elbow 2: The material distribution pipeline assembly also includes multiple φ300mm steel pipe elbows 2. In this embodiment, four elbows are provided, corresponding one-to-one with the four discharge steel pipes 1.2 of the intermediate material hopper 1. The steel pipe elbows 2 are fixed to the inner mold truss by welding. After installation, they move forward synchronously with the hanging basket, without the need for disassembly and assembly section by section.

[0036] The upper end of the steel pipe elbow 2 is connected to the discharge steel pipe 1.2 of the intermediate connecting hopper 1. The lower end of the discharge steel pipe 1.2 extends 10cm into the steel pipe elbow 2. The two are connected in a non-rigid manner, which facilitates the installation and dismantling of the intermediate connecting hopper 1. The lower end of the steel pipe elbow 2 is connected to the rigid material placing pipe and flexible material placing component used for the web and bottom plate. After the entire material placing pipeline system is installed, it moves synchronously with the hanging basket.

[0037] Web plate receiving hopper 3 and concrete conveying water belt 4: The web receiving hopper 3 is arranged on both sides of the web area of ​​the beam and is installed and fixed to the top layer of steel mesh. This receiving hopper is specifically used for concrete pouring operations above the web window. The web receiving hopper 3 adopts a rectangular converging structure design that is wider at the top and narrower at the bottom. Its lower end is connected to a φ200 concrete conveying water belt 4. The concrete conveying water belt 4 constitutes the concrete conveying component. In this embodiment, a 4.5m long and 25cm diameter string structure is used, which can penetrate deep into the web and directly convey concrete to the upper pouring area of ​​the web, avoiding concrete spillage or segregation during the placement process.

[0038] Rigid placing pipe (φ200mm steel pipe 5): The rigid concrete placement pipe includes at least two φ200mm steel pipes 5, which are arranged corresponding to the top windows on both sides of the web and are specifically used for concrete placement in the middle area of ​​the web. The upper end of the φ200mm steel pipe 5 is rigidly connected to the φ300mm steel pipe elbow 2, and the installation angle can be adjusted according to the actual position of the web placement window 8. The lower end of the φ200mm steel pipe 5 is connected to the φ200mm steel wire hose 6 of the steel pipe, and moves forward synchronously with the hanging basket after installation.

[0039] Flexible fabric components: The flexible material placement components include a φ200mm steel wire hose 6 for connecting to the steel pipe and a φ200mm steel wire hose 7 for connecting to the steel pipe elbow. Both types of hoses have flexible swing operation characteristics, which can adapt to the material placement needs of different pouring areas. After installation, they move forward synchronously with the hanging basket.

[0040] Among them, the upper ends of the two φ200mm steel wire hoses 6 connected to the steel pipes are connected one-to-one with the φ200mm steel pipes 5. During the pouring operation, the hoses can be inserted into the web plate material placement window 8 to place the material. After the operation is completed, the hoses can be easily removed, which greatly improves the convenience of operation.

[0041] The upper ends of the two φ200mm steel wire hoses 7 connected to the steel pipe elbows are rigidly connected to the φ300mm steel pipe elbows 2, respectively, and are used for concrete placement operations in the bottom windows on both sides of the web and the bottom plate area. During the operation, the bottom plate placement construction is carried out first, and the operators ensure that the bottom plate concrete is placed evenly by swinging the hoses left and right. After the bottom plate placement is completed, the hoses are then inserted into the web placement window 8 at the bottom of the web to carry out the concrete pouring of the lower part of the web.

[0042] Web fabric window 8: At least two web plate placement windows 8 are opened on the inner formwork of the web plate on both sides of the beam, corresponding to the lower part of the web plate pouring area and the middle part of the web plate pouring area respectively, for the concrete placing pipe to extend into and carry out the concrete placement operation in the web plate area; the web plate placement windows 8 are opened in advance during the inner formwork processing stage, and are equipped with a special window sealing cover plate, which is composed of a window sealing steel plate 8.3, a square tube flat beam 8.2 and a top screw 8.1.

[0043] Among them, the size of the window sealing steel plate is precisely matched with the window opening size of the web plate formwork to ensure the appearance quality of the concrete at the window; the square tube flat bar is clamped on the outside of the web plate formwork, and the installation and removal of the cover plate is completed by tightening and loosening the top screw, which improves the convenience of construction operation and can effectively avoid the problem of grout leakage during pouring.

[0044] Ballast plate 9 and ballast plate adjustment support 10: The pressure plate 9 is installed on the corresponding areas of the web plate on both sides of the top of the bottom plate. It is made of steel formwork, with a plate width of 2m, and is laid longitudinally along the pouring surface. The pressure plate 9 is connected to the web plate formwork through the adjustable support component 10. The opening and closing of the pressure plate 9 can be controlled by tightening and loosening the adjustable support. It can be manually controlled to open and close without frequent disassembly and assembly, and can move forward synchronously with the hanging basket, ensuring the convenience of operation and the continuity of construction.

[0045] During the bottom slab concrete pouring stage, the pressure plate 9 is in the open state to ensure smooth pouring of the bottom slab; after the bottom slab is poured and before the web is poured, the pressure plate 9 is closed and locked to prevent slurry heaving during the web concrete pouring process and to ensure the quality of the beam pouring.

[0046] Web plate manhole 11: Given the large pouring height of the web of the large-section concrete beam, workers need to enter the web to carry out concrete vibration operations. Therefore, one web entry hole 11 is reserved at each end of the formwork on both sides of the web to facilitate workers to enter and exit the formwork for inspection, adjustment, vibration and other operations. The web entry hole 11 is equipped with a special sealing cover plate. When the pouring height of the web concrete approaches the elevation of the entry hole, the entry hole is sealed in time to balance the convenience of workers' passage and the sealing of the formwork.

[0047] A method for cantilever casting and placement construction of large-section cable-stiffened bridge screen integrated continuous rigid frame using hanging baskets, implemented using a placement system, includes the following steps: S1: Install the steel pipe elbow 2, rigid placing pipe, flexible placing component, web plate placing window 8, pressure plate 9, adjusting support component 10, and web plate entry hole 11 in the corresponding positions so that the above components can move forward synchronously with the hanging basket. S2: Use lifting equipment to hoist the intermediate receiving hopper 1 and the web receiving hopper 3 to the preset positions of the beam segment to be poured and fix them; S3: Pump the concrete to the intermediate hopper 1. The concrete is then transported to the bottom slab pouring surface via the intermediate hopper 1, steel pipe elbow 2 and corresponding flexible material placing component. The workers use the swinging flexible material placing component to evenly distribute the concrete to the bottom slab. After the bottom slab concrete is poured and the surface is finished, the pressure plate 9 is closed by adjusting the support component 10 to back-pressure seal the bottom slab concrete. S4: Layered pouring of web concrete: S41: Connect the flexible fabric piece for the bottom plate to the web plate fabric window 8 of the lower layer of the web plate, and pour the lower layer of web plate concrete. The workers enter the web plate through the web plate manhole 11 to vibrate the concrete. After the lower layer of web plate concrete is poured, remove the flexible fabric piece and close the lower layer web plate fabric window 8. S42: Concrete is fed through the intermediate hopper 1, steel pipe elbow 2, rigid placing pipe and corresponding flexible placing component, and connected to the upper web placing window 8 of the web plate to pour the middle layer of concrete in the web plate. After the pouring is completed, the flexible placing component is removed and the upper web plate placing window 8 is closed. S43: Concrete is pumped to the web receiving hopper 3 and then transported to the top layer of the web via the concrete conveying device to complete the top layer concrete pouring of the web. S5: After the web plate is poured, remove the intermediate receiving hopper 1 and the web plate receiving hopper 3, and pour the top slab concrete of the beam to complete the pouring operation of the single segment beam.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A cantilever casting and placement system for integrated continuous rigid frame bridge panels with large cross-section cable stiffeners, characterized in that, include: Intermediate hopper (1), the intermediate hopper (1) is fixedly installed on the top of the beam segment to be poured, the discharge end of the intermediate hopper (1) is provided with multiple discharge pipes with opening and closing control components, the discharge ends of the multiple discharge pipes correspond to the bottom plate pouring area of ​​the beam and the inlet end of each set of web plate receiving hoppers (3), and are used to divert the pumped concrete to different pouring areas. At least two sets of web plate receiving hoppers (3) are provided, with the two sets of web plate receiving hoppers (3) located directly above the web plates on both sides of the top of the beam segment to be poured. The discharge end of each set of web plate receiving hoppers (3) is connected to a concrete conveying device that extends vertically into the web plate, which is used to directly convey concrete to the upper pouring area of ​​the web plate. At least two sets of web plate fabric windows (8) are provided. The web plate fabric windows (8) are opened in pairs on the web plate inner mold on both sides of the beam. Each set of web plate fabric windows (8) is equipped with a detachable sealing cover. An openable pressure plate (9) is provided at the chamfered position where the bottom plate of the beam connects with the web plate. The pressure plate (9) is connected to the inner mold structure through an adjustable support member (10) to realize the opening and closing control of the pressure plate (9). Web plate entry hole (11), the web plate entry hole (11) is opened in pairs at the end template of the web plate, and the web plate entry hole (11) is equipped with a sealing cover plate; The material distribution pipeline assembly includes a rigid material distribution pipe and a flexible material distribution component. The inlet end of the rigid material distribution pipe is connected to the outlet end of the intermediate material hopper (1). The inlet end of the flexible material distribution component is connected to the rigid material distribution pipe. The outlet end of the flexible material distribution component corresponds to the web plate material distribution window (8) and the core casting area of ​​the beam bottom plate, respectively, to achieve precise layered material distribution of the bottom plate and the web plate.

2. The cantilever casting and placement system for integrated continuous rigid frame cable-stiffened bridge panels according to claim 1, characterized in that, The intermediate material hopper (1) is located in the central area of ​​the beam top in both longitudinal and transverse directions. The intermediate material hopper (1) includes a lifting ring (1.3), a feeding hopper (1.4), a receiving hopper cover plate (1.1), and multiple discharge steel pipes (1.2). The lifting ring (1.3) is fixed to the top of the feeding hopper (1.4). The feeding hopper (1.4) adopts a narrow-mouth structure with a wider top and a narrower bottom. The upper ends of the multiple discharge steel pipes (1.2) are connected to the discharge port of the feeding hopper (1.4), and the lower ends penetrate the top plate of the beam and extend into the box girder. The receiving hopper cover plate (1.1) is correspondingly set at the upper end of each discharge steel pipe, forming the opening and closing control component of the discharge pipeline.

3. The cantilever casting and placement system for integrated continuous rigid frame cable-stiffened bridge panels according to claim 2, characterized in that, The fabric distribution pipeline assembly also includes multiple steel pipe elbows (2), which are fixed on the inner formwork truss and can move forward synchronously with the hanging basket; the upper end of the steel pipe elbow (2) is connected to the discharge steel pipe of the intermediate material hopper (1), and the lower end is connected to the rigid fabric distribution pipe or the flexible fabric distribution component; the lower end of the discharge steel pipe extends into the steel pipe elbow (2), and the two are connected in a non-rigid manner.

4. The cantilever casting and placement system for integrated continuous rigid frame cable-stiffened bridge panels according to claim 1, characterized in that, The rigid fabric tube includes at least two steel pipes (5), which are respectively located at corresponding positions on both sides of the web of the beam. The upper end of the steel pipe (5) is rigidly connected to the steel pipe elbow (2), and the lower end is connected to a steel wire hose (6). The steel wire hose (6) constitutes the flexible fabric component, and its outlet end can be inserted into the fabric window (8) of the web to carry out fabric placement.

5. The cantilever casting and placement system for integrated continuous rigid frame cable-stiffened bridge panels according to claim 1, characterized in that, The flexible fabric component includes at least two steel wire hoses (7) connected to steel pipe elbows. The upper end of the steel wire hose (7) is rigidly connected to the steel pipe elbow (2), and the lower end can be inserted into the web fabric window (8) at the lower part of the web or extended to the bottom plate casting area of ​​the beam.

6. The cantilever casting and placement system for integrated continuous rigid frame cable-stiffened bridge panels according to claim 1, characterized in that, The web receiving hopper (3) adopts a narrow-mouth structure with a wider top and a narrower bottom. The web receiving hopper (3) is fixed to the top layer of the steel mesh of the beam. The concrete conveying component adopts a concrete conveying water belt (4), which extends vertically to the pouring area inside the web.

7. The cantilever casting and placement system for integrated continuous rigid frame cable-stiffened bridge panels according to claim 1, characterized in that, At least two web plate placement windows (8) are provided on the inner formwork of each side of the beam body, corresponding to the lower casting area and the middle casting area of ​​the web plate respectively; the sealing cover of the web plate placement window (8) includes a sealing steel plate, a square tube flat beam and a top screw. The size of the sealing steel plate matches the opening size of the web plate placement window (8). The square tube flat beam is clamped on the outside of the web plate template. The top screw passes through the square tube flat beam and presses against the sealing steel plate to achieve the sealing and fixing of the cover plate.

8. The cantilever casting and placement system for integrated continuous rigid frame cable-stiffened bridge panels according to claim 1, characterized in that, The pressure plate (9) is made of steel template and is laid out longitudinally along the pouring surface. The pressure plate (9) is in the open state during the bottom slab concrete pouring stage and in the closed and locked state after the bottom slab is poured and before the web is poured.

9. The cantilever casting and placement system for integrated continuous rigid frame cable-stiffened bridge panels according to claim 1, characterized in that, At least one web entry hole (11) is reserved at the end template of each side web of the beam. The height of the web entry hole (11) is matched with the operation requirements of web concrete vibration operation. The sealing cover of the web entry hole (11) is detachably sealed to the end template.

10. A method for cantilever casting and placement construction of large-section cable-stiffened bridge screen integrated continuous rigid frame using hanging basket, characterized in that, The fabric system described in any one of claims 1-9 is implemented by comprising the following steps: S1: Install the steel pipe elbow (2), rigid cloth pipe, flexible cloth component, web cloth window (8), pressure plate (9), adjustment support component (10), and web inlet hole (11) in place so that the above components can move forward synchronously with the hanging basket. S2: The intermediate receiving hopper (1) and the web receiving hopper (3) are hoisted to the preset position of the beam segment to be poured and fixed by the lifting equipment; S3: Pump the concrete to the intermediate hopper (1). The concrete is transported to the bottom slab pouring surface through the intermediate hopper (1), steel pipe elbow (2) and corresponding flexible material placing component. The operator evenly distributes the concrete to the bottom slab by swinging the flexible material placing component. After the bottom slab concrete is poured and the surface is finished, the pressure plate (9) is closed by adjusting the support component (10) to back-pressure seal the bottom slab concrete. S4: Layered pouring of web concrete: S41: Connect the flexible fabric piece for the bottom plate to the web plate fabric window (8) of the lower layer of the web plate, and pour the lower layer of web plate concrete. The workers enter the web plate through the web plate access hole (11) to vibrate the concrete. After the lower layer of web plate concrete is poured, take out the flexible fabric piece and close the lower layer web plate fabric window (8). S42: Concrete is connected to the web plate placement window (8) on the upper layer of the web plate through the intermediate material hopper (1), steel pipe elbow (2), rigid material placement pipe and corresponding flexible material placement component, and the middle layer of web plate concrete is poured. After the pouring is completed, the flexible material placement component is removed and the upper layer web plate placement window (8) is closed. S43: The concrete is pumped to the web plate receiving hopper (3) and then transported to the top layer of the web plate via the concrete conveying device to complete the top layer of the web plate concrete pouring. S5: After the web plate is poured, remove the intermediate material receiving hopper (1) and the web plate material receiving hopper (3), and pour the top plate concrete of the beam to complete the pouring operation of the single segment beam.

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