A method for prefabricating an f-beam

Abstract

The present application relates to the construction technology field of cross-sea bridge, and particularly relates to a F-beam prefabrication method, comprising the following steps: S1: constructing a concrete pedestal and reserving a placing groove in the pedestal; S2: placing a first bottom die on the upper surface of the pedestal, prepositioning a bracket beam together with a lifting boom in the placing groove, placing a second bottom die on the upper surface of the bracket beam, the upper surfaces of the first bottom die and the second bottom die being located on the same plane and the first bottom die and the second bottom die being disconnected at a joint; S3: binding C-block steel bars on the pedestal; S4: installing prestressed pipes; S5: installing C-block end dies and C-block side dies; S6: pouring C-block concrete; S7: removing the C-block side dies and performing concrete curing; S8: performing prestressed tensioning and grouting; S9: lifting the C-block through the lifting boom, completing C-block demolding from the first bottom die, lifting the C-block to a beam storage area, and completing F-beam C-block prefabrication. The F-beam prefabrication method uses the bracket beam as the bottom die, simplifies the C-block demolding step, and significantly improves the prefabrication efficiency and construction safety.

Description

Technical Field

[0001] This invention relates to the field of cross-sea bridge construction technology, and in particular to a method for prefabricating F-beams. Background Technology

[0002] A special type of F-beam (such as...) has recently appeared on the market. Figure 1 , Figure 2 As shown in the figure, it is used in the construction of cross-sea bridges. Its unique design integrates pedestrian areas (cantilevered), utility tunnel areas and green areas, which not only simplifies the on-site construction process, but also reduces the risk of pollution to the marine environment, achieving a unity of functionality and aesthetics.

[0003] When constructing F-beams, due to their irregular shape and enormous weight (typically exceeding 400 tons), traditional on-site monolithic casting methods are difficult to implement. Therefore, in actual construction, F-beams usually need to be prefabricated in sections at a beam fabrication yard, and then transported to the construction site for assembly. Existing sectioning methods include... Figure 1 , Figure 2 As shown, it is usually divided into three parts: A, B, and C. The cross-sectional shapes of parts A and B are approximately the same as those of a conventional "I"-shaped beam, while part C (as shown in the image) is different. Figure 3 , Figure 4 The block shown is an irregularly shaped block with an extra-wide base and an extra-heavy weight. Its base width is usually between 4500mm and 5000mm, and the weight of a single block usually exceeds 170 tons.

[0004] Currently, traditional regular beam types (such as I-beams, T-beams, or blocks A and B of F-beams) are typically cast on steel formwork pedestals. The mold generally consists of a bottom mold and side molds, with the bottom mold fixed to the pedestal and the side molds removable. During demolding, the side molds are first removed, and then the beam blocks are separated from the bottom mold using methods such as crane lifting. Taking block A of an F-beam as an example, block A can usually be lifted using a wire rope jack to complete demolding. However, block C of an F-beam is an irregularly shaped block with an excessively wide base and excessive weight, making it impossible to use the wire rope jack method for lifting. If traditional prefabrication methods are used, block C is difficult to demold, significantly impacting construction efficiency. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of existing beam prefabrication methods, which are not applicable to the pre-setting of C blocks in F-beams, resulting in difficulties in demolding C blocks, and to provide a prefabrication method for F-beams.

[0006] In a first aspect, the present invention provides a method for prefabricating F-beams, comprising the following steps: S1: Construct a concrete platform and reserve a slot in the platform to accommodate the support beam. The slot is located at both ends of the platform. S2: Place the first bottom mold on the upper surface of the pedestal, pre-place the support beam and the hanger rod in the placement groove, and place the second bottom mold on the upper surface of the support beam. The upper surfaces of the first bottom mold and the second bottom mold are on the same plane and the first bottom mold and the second bottom mold are disconnected at the joint. S3: Tie the C-block steel bars onto the pedestal; S4: Install prestressed ducts; S5: Install the end mold and side mold of block C; S6: Pour concrete for block C. When pouring, first pour the bottom slab and cantilever beam of block C, and then pour the web of block C. S7: Remove the side formwork of block C and perform concrete curing; S8: Perform prestressing tensioning and grouting; S9: Lift block C using a boom to demold block C from the first bottom formwork, then lift block C to the beam storage area to complete the prefabrication of block C of beam F.

[0007] The F-beam prefabrication method provided by this invention directly embeds the load-bearing support beam for lifting block C into the placement groove. A second bottom mold is installed on the upper surface of the support beam, making the support beam not only a lifting tool but also a casting mold for the bottom of the beam. The first and second bottom molds are disconnected at their joints. After the beam is cast, the embedded support beam can be directly lifted, allowing block C to be detached from the first bottom mold, thus achieving demolding of block C from the first bottom mold. The second bottom mold can be detached from the beam when the lifting tool for block C is removed, greatly simplifying the demolding process of block C and significantly improving prefabrication efficiency and construction safety.

[0008] Preferably, in S1, the position of the placement groove corresponds to the position of the cantilever beam of block C.

[0009] To reduce the weight of block C, the cantilever beams of block C are spaced out. The positions of the placement slots correspond to the positions of the cantilever beams of block C, so that the support beams can hold the cantilever beams of block C after the block is poured, ensuring the safety of subsequent hoisting operations.

[0010] Preferably, in S1, the placement groove is located below the web of block C.

[0011] The placement slot is located below the web of block C, which allows the support beam to support the bottom plate and cantilever beam of block C, while also bringing the lifting action line closer to the center line of gravity of the entire block C, ensuring the safety of subsequent lifting operations.

[0012] Preferably, in S1, two mounting slots are pre-formed at the front end of the pedestal and two mounting slots are pre-formed at the rear end of the pedestal.

[0013] Because block C has an eccentric, irregular structure, the lifting equipment used to lift it is a balance beam lifting equipment similar to a frame structure. Two mounting slots are designed at the front end of the platform, corresponding to two support beams; similarly, there are two support beams at the rear end of the platform. During lifting, block C can be lifted simultaneously from both ends along its length, ensuring the beam's stability and preventing tilting.

[0014] Preferably, in S3, when tying the C-block reinforcement, the position and spacing of the main reinforcement are marked according to the design requirements, and the position of each stirrup is marked on the main reinforcement according to the designed stirrup spacing, and then tied and installed one by one.

[0015] By precisely marking the spacing and position of the main reinforcement bars and stirrups with lines, the geometric dimensions of the steel reinforcement cage are ensured to meet the design requirements, avoiding the accumulation of errors caused by manual estimation or visual inspection, and guaranteeing the structural bearing capacity after the C block is formed.

[0016] Preferably, in S4, the prestressed duct is a galvanized double-corrugated pipe. During installation, a positioning rib is set every 100cm±5cm, and a positioning rib is set every 50cm±5cm in the bending section of the prestressed duct.

[0017] The alignment (position, curvature) of the prestressed duct is precisely designed based on structural calculations. By setting dense and precise positioning ribs in the straight and curved sections, lateral displacement or floating of the galvanized double-corrugated pipe can be effectively prevented during rebar tying, worker movement, or concrete pouring, ensuring that the actual applied prestress matches the design value, thereby guaranteeing the bending resistance and crack resistance of block C under huge loads.

[0018] Preferably, S5 includes the following steps: S51: Install C-block end mold: S511: Loft the position of the end mold of block C, starting from the center and moving outwards to both sides; S512: Install anchor plates on the end mold of block C and fill the grouting holes with foam; S513: Hoist the C-block end mold to the installation position, aligning the mold end with the long mark line on the upper beam of the bottom mold; S514: After the C block end formwork is installed, a rigid plastic flexible tube is inserted into the prestressed duct; S52: Install the C-block side mold, with the lower edge of the C-block side mold covering the base by at least 5cm.

[0019] During construction, an integral formwork was used for the C-block end formwork, with layout proceeding from the center outwards to both sides. This ensured the installation accuracy of key structures such as the C-block beam length, prestressed ducts, and end anchor plates. Foam was inserted into the grouting holes of the anchor plates to prevent concrete or mortar from entering and clogging the ducts. Rigid plastic flexible tubing was installed inside the prestressed ducts to prevent grout from entering the corrugated pipes or deforming them during pouring, ensuring the prestressed ducts maintained their geometric integrity and clean, unobstructed inner walls before tensioning and grouting. The lower edge of the C-block side formwork wrapped around the platform by at least 5cm to prevent root rot, honeycombing, or grout leakage at the beam bottom, improving the beam's appearance quality and durability.

[0020] Preferably, S6 includes the following steps: S61: Cast the bottom slab and cantilever beam of block C. The bottom slab and cantilever beam of block C are cast in one layer. The casting direction is from the first end to the last end of block C. When the casting reaches 4 to 5 meters from the last end, the casting direction is changed to the first end from the last end. Finally, the closure is completed. S62: Cast the web of block C. The web of block C shall be cast in layers, with each layer not exceeding 30cm in thickness.

[0021] When pouring the C-block base slab and C-block cantilever beam, at a distance of 4m from the end... At 5m, the pouring method was changed to reverse pouring, with the final closure in the middle area. This effectively controls water seepage and shrinkage in the beam, helping to push air and water along the pouring direction towards the closure joint, preventing the formation of air bubbles or water pockets within the beam. Simultaneously, it balances the lateral pressure of the ultra-wide base slab, preventing formwork deformation and ensuring the base slab's alignment and geometric dimensions. The C-block web is relatively high, and layered pouring ensures that the effective range of the vibrator can completely cover and fully overlap, avoiding structural defects such as honeycomb, pitting, or voids caused by insufficient vibration. Furthermore, controlling the layer height reduces lateral pressure on the side formwork, further ensuring the side formwork remains undeformed and maintaining the web's alignment.

[0022] Preferably, in S7, when removing the side formwork of block C, the temperature difference between the concrete core of block C and the surface of block C, and between the surface of block C and the ambient temperature, is no greater than 15℃; when performing concrete curing, the wet curing period is no less than 7 days.

[0023] Strict control of temperature difference can avoid surface or deep cracks caused by temperature stress mismatch between the inside and the surface of concrete, thus ensuring the structural integrity of block C; sufficient wet curing ensures the full progress of cement hydration reaction, ensuring that block C can reach the design strength before entering the prestressing tensioning stage.

[0024] Preferably, in S9, the height of block C above the pedestal is no more than 30cm, and the block moves horizontally and at a constant speed, with an inclination angle of less than 5°.

[0025] Strictly limiting the lifting height, horizontal movement speed, and beam tilt angle can ensure the safety of beam demolding and hoisting, and reduce the probability of hoisting accidents.

[0026] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention provides a method for prefabricating F-beams, in which the load-bearing support beam for lifting C-blocks is directly embedded in the placement groove. A second bottom mold is installed on the upper surface of the support beam, making the support beam not only a lifting tool but also a casting mold for the bottom of the beam. The first and second bottom molds are disconnected at their joints. After the beam is cast, the embedded support beam can be directly lifted, allowing the C-block to be detached from the first bottom mold, thus achieving demolding of the C-block from the first bottom mold. The second bottom mold can be detached from the beam when the C-block lifting tool is removed, greatly simplifying the demolding process of the C-block and significantly improving prefabrication efficiency and construction safety. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the segmentation of beam F; Figure 2 This is a top view of beam F; Figure 3 This is a schematic diagram of the C-block structure; Figure 4 This is a top view of block C; Figure 5 This is a schematic diagram of the pedestal structure; Figure 6 This is a top view of the pedestal; Figure 7 A schematic diagram showing the support beam pre-placed in the mounting slot; Figure 8 for Figure 7 Enlarged diagram of section A in the middle; Figure 9 This is a schematic diagram showing the lifting status of block C; Figure 10 This is a schematic diagram showing the state after block C is lifted. Figure 11 This is the main view of the C-block lifting device; Figure 12 This is a side view of the C-block lifting device.

[0028] Marked in the image: 1-Platform, 11-Installation slot, 21-First bottom formwork, 22-Second bottom formwork, 31-Support beam, 32-Hanging rod. Detailed Implementation

[0029] The present invention will now be described in further detail with reference to specific embodiments. However, this should not be construed as limiting the scope of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0030] Unless otherwise specified, the use of terms such as "upper," "lower," "left," "right," "center," "inner," and "outer" to indicate orientation or positional relationships in the description of specific embodiments of the present invention is based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationship in which the product / equipment / device is typically placed during use. These terms are merely for the purpose of facilitating the description of the present invention or simplifying the description in specific embodiments, enabling those skilled in the art to quickly understand the solution, and do not indicate or imply that a particular device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, they should not be construed as limitations on the present invention.

[0031] Furthermore, the use of terms such as "horizontal," "vertical," "suspended," and "parallel" does not imply that the corresponding device / component / element must be absolutely horizontal, vertical, suspended, or parallel, but rather that it can be slightly tilted or have a deviation. For example, "horizontal" merely means that its direction is more horizontal relative to "vertical," not that the structure must be completely horizontal, but that it can be slightly tilted. Alternatively, it can be simplified to mean that the corresponding device / component / element, when set in a "horizontal," "vertical," "suspended," or "parallel" direction, can have an error / deviation of ±10% relative to the corresponding direction, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, and more preferably within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the present invention.

[0032] Furthermore, the use of terms such as "first," "second," and "third" in terminology is merely for distinguishing descriptions of identical or similar components and should not be interpreted as emphasizing or implying the relative importance of a particular component.

[0033] Furthermore, in the description of the embodiments of the present invention, "several", "more than", and "a number of" represent at least two. The number can be any number, such as 2, 3, 4, 5, 6, 7, 8, or 9, and can even exceed nine.

[0034] Furthermore, in the description of the technical solution of this invention, unless otherwise explicitly specified / limited / restricted, the terms "set up," "install," "connect," "link," "provided with," "laid out," and "arranged" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to common connection methods in the art, such as welding, riveting, bolting, and threaded connections. Such connections can be mechanical, electrical, or communication connections; they can be direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components.

[0035] Example 1 This embodiment provides a method for prefabricating F-beams, used for prefabricating such beams in a beam fabrication yard. Figures 1-4 The C block of beam F is shown. Because the C block of beam F is an irregularly shaped block, its base plate is excessively wide (typically 4500mm–5000mm), its web plate is excessively high (typically exceeding 2500mm), and its weight is excessive (typically exceeding 170 tons), making it impossible to lift using a wire rope sling method. For example... Figure 11 , Figure 12 The special lifting device for block C is shown. This device supports the bottom plate and cantilever beam of block C through the bottom support beam 31. The lifting rod 32 passes through the body of block C and connects the support beam 31 to the middle cross beam. In this way, the support beam 31 and the middle cross beam can form a stable lifting frame, thereby enabling stable lifting of block C.

[0036] Specifically, the F-beam prefabrication method provided in this embodiment includes the following steps: S1: Construction concrete platform 1, such as Figure 5 , Figure 6 , Figure 7 As shown, a mounting slot 11 for accommodating the support beam 31 is reserved in the pedestal 1. The mounting slot 11 is located at both ends of the pedestal 1. It can be understood that the size, depth and position of the mounting slot 11 match the position of the support beam 31 when the C block is hoisted later.

[0037] Furthermore, the position of the mounting slot 11 corresponds to the position of the cantilever beam in block C. Specifically, as shown... Figure 9 As shown, the mounting slot 11 is located below the cantilever beam of block C. Figure 4 As shown, to reduce the weight of block C, the cantilever beams of block C are spaced apart along the length of block C. The position of the placement groove 11 corresponds to the position of the cantilever beams of block C, so that the support beam 31 can support the cantilever beams of block C after the block C is poured, ensuring the safety of subsequent hoisting operations.

[0038] Furthermore, such as Figure 9 As shown, the placement slot 11 is located below the web of block C. That is, the placement slot 11 passes through the bottom plate, web, and cantilever beam of block C, so that the position of the support beam 31 can support the bottom plate, web, and cantilever beam of the completed block C, and at the same time, make the lifting action line closer to the center line of gravity of the entire block C, ensuring the safety of subsequent lifting operations.

[0039] Furthermore, such as Figure 6 As shown, two mounting slots 11 are prefabricated at the front end of the pedestal 1, and two mounting slots 11 are prefabricated at the rear end of the pedestal 1. (As indicated...) Figures 10-12As shown, since block C is an eccentric irregular structure, the lifting device for lifting block C is a balance beam lifting device similar to a frame structure. Two mounting slots 11 are designed at the first end of the platform 1, which correspond to two supporting beams 31. Similarly, there are also two supporting beams 31 at the last end of the platform 1. During lifting, it can be lifted simultaneously from both the first and last ends along the length of block C, ensuring the stability of the beam and preventing the beam from tilting.

[0040] S2: Place the first bottom mold 21 on the upper surface of the pedestal 1, pre-place the support beam 31 along with the hanger 32 in the placement groove 11, and place the second bottom mold 22 on the upper surface of the support beam 31, as follows: Figure 8 As shown, the upper surfaces of the first bottom mold 21 and the second bottom mold 22 are located on the same plane, and the first bottom mold 21 and the second bottom mold 22 are disconnected at the joint.

[0041] S3: Tie the C-block steel bars on the base 1. Specifically, when tying the C-block steel bars, mark the position and spacing of the main bars according to the design requirements, and mark the position of each stirrup on the main bars according to the designed stirrup spacing, and then tie and install them one by one.

[0042] S4: Install prestressed ducts; In this embodiment, the prestressed ducts are galvanized double-corrugated pipes. For positive bending moments in block C, corrugated pipes with inner diameters of 60mm and 65mm are used; for negative bending moments, corrugated pipes with inner diameters of 95mm and 105mm are used. The length of each corrugated pipe is manufactured according to actual needs. During installation, a positioning rib is installed every 100cm ± 5cm, and a positioning rib is installed every 50cm ± 5cm in the bending section of the prestressed duct. Φ12 steel bars can be used for the positioning ribs.

[0043] S5: Install the C-block end mold and C-block side mold, specifically including the following steps: S51: Install C-block end mold: S511: Loft the position of the end mold of block C. When lofting, start from the center and work outwards to both sides, and then mark the positions. S512: Install anchor plates on the end mold of block C and fill the grouting holes with foam; S513: Hoist the C block end formwork to the installation position, hold the formwork at both ends to prevent the formwork from colliding with the steel reinforcement cage; under the command of the formwork erection personnel, slowly lower the hook so that the formwork end is aligned with the beam length mark line on the bottom formwork; S514: After the C block end formwork is installed, a rigid plastic flexible tube is inserted into the prestressed duct; S52: Install the C-block side mold, with the lower edge of the C-block side mold wrapping around the base 1 by at least 5cm.

[0044] During construction, an integral formwork was used for the C-block end formwork, with layout proceeding from the center outwards to both sides. This ensured the installation accuracy of key structures such as the C-block beam length, prestressed ducts, and end anchor plates. Foam was inserted into the grouting holes of the anchor plates to prevent concrete or mortar from entering and clogging the ducts. Rigid plastic flexible tubing was installed inside the prestressed ducts to prevent grout from entering the corrugated pipes or causing deformation during pouring, ensuring the prestressed ducts maintained their geometric integrity and clean, unobstructed inner walls before tensioning and grouting. The lower edge of the C-block side formwork wrapped around the platform by at least 5cm to prevent root rot, honeycombing, or grout leakage at the beam bottom, improving the beam's appearance quality and durability.

[0045] S6: Pour the concrete for block C. First, pour the base slab and cantilever beam of block C, then pour the web of block C. Specifically, this includes the following steps: S61: Cast the bottom slab and cantilever beam of block C. The bottom slab and cantilever beam of block C are cast in one layer. The casting direction is from the first end to the last end of block C. When the casting reaches 4 to 5 meters from the last end, the casting direction is changed to the first end from the last end. Finally, the closure is completed. S62: Cast the web of block C. The web of block C shall be cast in layers, with each layer not exceeding 30cm in thickness.

[0046] When pouring the C-block base slab and C-block cantilever beam, at a distance of 4m from the end... At 5m, the pouring method was changed to reverse pouring, with the final closure in the middle area. This effectively controls water seepage and shrinkage in the beam, helping to push air and water along the pouring direction towards the closure joint, preventing the formation of air bubbles or water pockets within the beam. Simultaneously, it balances the lateral pressure of the ultra-wide base slab, preventing formwork deformation and ensuring the base slab's alignment and geometric dimensions. The C-block web is relatively high, and layered pouring ensures that the effective range of the vibrator can completely cover and fully overlap, avoiding structural defects such as honeycomb, pitting, or voids caused by insufficient vibration. Furthermore, controlling the layer height reduces lateral pressure on the side formwork, further ensuring the side formwork remains undeformed and maintaining the web's alignment.

[0047] S7: Remove the side formwork of block C and carry out concrete curing; when removing the side formwork of block C, the temperature difference between the concrete core of block C and the surface of block C, and between the surface of block C and the environment, shall not exceed 15℃; when carrying out concrete curing, the wet curing period shall not be less than 7 days.

[0048] Strict control of temperature difference can avoid surface or deep cracks caused by temperature stress mismatch between the inside and the surface of concrete, thus ensuring the structural integrity of block C; sufficient wet curing ensures the full progress of cement hydration reaction, ensuring that block C can reach the design strength before entering the prestressing tensioning stage.

[0049] S8: Prestressing tensioning and grouting can only be carried out after the concrete strength reaches 80% of the design value and the concrete age is not less than 7 days. Specifically, prestressed engineering includes five steps commonly used in industrial production: duct forming, material cutting and bundling, cable threading, tensioning, and grouting.

[0050] S9: As Figure 9 , Figure 10 As shown (the black arrow in the figure indicates the lifting direction), the gantry crane lifts block C through boom 32, completes the demolding of block C from the first bottom mold 21, and lifts block C to the beam storage area to complete the prefabrication of block C of beam F.

[0051] Specifically, the height of block C above platform 1 should not exceed 30cm, and it should move horizontally and at a constant speed during the lifting process, with a tilt angle of less than 5°. Strictly limiting the lifting height, horizontal movement speed, and beam tilt angle ensures the safety of beam demolding and lifting, reducing the probability of lifting accidents.

[0052] The F-beam prefabrication method provided in this embodiment directly embeds the load-bearing support beam 31 for lifting block C into the placement groove 11. A second bottom mold 22 is installed on the upper surface of the support beam 31, so that the support beam 31 is not only a lifting tool, but also serves as a casting mold for the bottom of the beam. The first bottom mold 21 and the second bottom mold 22 are disconnected at their joints. After the beam is cast, the embedded support beam 31 can be directly lifted to detach block C from the first bottom mold 21, realizing the demolding of block C from the first bottom mold 21. The second bottom mold 22 can be detached from the beam when the lifting tool for block C is removed, which greatly simplifies the demolding steps of block C and significantly improves prefabrication efficiency and construction safety.

[0053] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for prefabricating block C of beam F, characterized in that, The F-beam is prefabricated into multiple pieces, with piece C being an irregularly shaped block containing a bottom slab, web, and cantilever beams. The prefabrication method for beam C includes the following steps: S1: Construct a concrete platform (1) and reserve a slot (11) in the platform (1) for accommodating the support beam (31). The slot (11) is located at both ends of the platform (1). S2: Place the first bottom mold (21) on the upper surface of the platform (1), pre-place the support beam (31) together with the hanging rod (32) in the placement groove (11), and place the second bottom mold (22) on the upper surface of the support beam (31). The upper surfaces of the first bottom mold (21) and the second bottom mold (22) are located on the same plane and the first bottom mold (21) and the second bottom mold (22) are disconnected at the joint. S3: Tie the C-block steel bars on the pedestal (1); S4: Install prestressed ducts; S5: Install the end mold and side mold of block C; S6: Pour concrete for block C. When pouring, first pour the bottom slab and cantilever beam of block C, and then pour the web of block C. S7: Remove the side formwork of block C and perform concrete curing; S8: Perform prestressing tensioning and grouting; S9: Lift block C by lifting rod (32) to complete the demolding of block C from the first bottom formwork (21), lift block C to the beam storage area, and complete the prefabrication of block C of beam F.

2. The prefabrication method for F-beam C-block according to claim 1, characterized in that, In S1, the position of the placement slot (11) corresponds to the position of the cantilever beam of block C.

3. The prefabrication method for F-beam C-block according to claim 2, characterized in that, In S1, the placement slot (11) is located below the web of block C.

4. The prefabrication method for F-beam C-block according to claim 3, characterized in that, In S1, two mounting slots (11) are prefabricated at the front end of the pedestal (1) and two mounting slots (11) are prefabricated at the rear end of the pedestal (1).

5. The prefabrication method for F-beam C-block according to claim 1, characterized in that, In S3, when tying the C-block reinforcement, mark the position and spacing of the main reinforcement according to the design requirements, and mark the position of each stirrup on the main reinforcement according to the designed stirrup spacing, and then tie and install them one by one.

6. The prefabrication method for F-beam C-block according to claim 1, characterized in that, In S4, the prestressed duct is a galvanized double-corrugated pipe. During installation, a positioning rib is installed every 100cm±5cm, and a positioning rib is installed every 50cm±5cm in the bending section of the prestressed duct.

7. The prefabrication method for F-beam C-block according to claim 1, characterized in that, S5 includes the following steps: S51: Install C-block end mold: S511: Loft the position of the end mold of block C, starting from the center and moving outwards to both sides; S512: Install anchor plates on the end mold of block C and fill the grouting holes with foam; S513: Hoist the C-block end mold to the installation position, aligning the mold end with the long mark line on the upper beam of the bottom mold; S514: After the C block end formwork is installed, a rigid plastic flexible tube is inserted into the prestressed duct; S52: Install the C-block side mold, with the lower edge of the C-block side mold wrapping around the base (1) by at least 5cm.

8. The prefabrication method for F-beam C-block according to claim 1, characterized in that, S6 includes the following steps: S61: Cast the bottom slab and cantilever beam of block C. The bottom slab and cantilever beam of block C are cast in one layer. The casting direction is from the first end to the last end of block C. When the casting reaches 4 to 5 meters from the last end, the casting direction is changed to the first end from the last end. Finally, the closure is completed. S62: Cast the web of block C. The web of block C shall be cast in layers, with each layer not exceeding 30cm in thickness.

9. The prefabrication method for F-beam C-block according to claim 1, characterized in that, In S7, when removing the side formwork of block C, the temperature difference between the concrete core of block C and the surface of block C, and between the surface of block C and the ambient temperature, shall not exceed 15℃; when carrying out concrete curing, the wet curing period shall not be less than 7 days.

10. The prefabrication method for F-beam C-block according to claim 1, characterized in that, In S9, the height of block C from the platform (1) is no more than 30cm. During the horizontal movement, block C moves at a constant speed in parallel and the tilt angle of block C is less than 5°.

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