Variable cross-section segmental beam steel bar binding jig frame and construction method

Abstract

The invention discloses a steel bar binding jig frame for a variable-cross-section segmental beam. The steel bar binding jig frame comprises a fixed support, a movable end formwork and a movable inner cavity frame. The top of the fixed bracket is used for placing a segmental beam steel reinforcement framework; the movable end formwork bodies are symmetrically arranged at the two ends of the fixed support in the length direction and adjustably connected with the ends of the fixed support, and the movable end formwork bodies move to be attached to the end plane of the fixed support through moving structures at the bottoms of the movable end formwork bodies and are used for being matched with the outer contours of different segment beam steel reinforcement frameworks; the movable inner cavity frame is arranged above the bottom plate of the fixed support and located between the two movable end formwork bodies, the movable inner cavity frame can move horizontally, the height of the movable inner cavity frame can be adjusted in the vertical direction, and the movable inner cavity frame is used for supporting an inner cavity of a beam body of the segmental beam and limiting the inner cavity outline of a steel reinforcement framework of the segmental beam. The variable cross-section segmental beam steel bar binding jig frame can adapt to binding operation of various variable cross-section segmental beam steel bar frameworks with different outer contours and inner cavity contours.

Description

Technical Field

[0001] This invention relates to the field of reinforcement binding formwork and construction method for variable cross-section segmental beams. More specifically, this invention relates to a reinforcement binding formwork and construction method for variable cross-section segmental beams. Background Technology

[0002] Currently, bridge construction is gradually developing towards factory-based, prefabricated, and standardized production. The application of precast segmental concrete box girders is becoming increasingly widespread. Most of these segmental box girders are of uniform cross-section, with a few involving beams with varying heights or widths. When precast segmental beams, the reinforcing steel cage needs to be pre-tied and formed in molds, typically using a fixed-structure jig. This type of jig is unsuitable for binding the reinforcing steel cage of large-section, variable-section segmental beams. When multiple segments have different cross-sectional shapes, various types of jigs need to be fabricated according to the cross-sectional shape, or binding needs to be performed within the formwork. Additional supports are required within the cavity, resulting in resource waste, poor economy and applicability, and low efficiency. Summary of the Invention

[0003] To achieve these and other advantages of the invention, a preferred embodiment of the invention provides a variable cross-section segmental beam reinforcement binding frame, including a fixed support, a movable end formwork, and a movable inner cavity frame; The top of the fixed bracket is used to place the steel reinforcement cage of the segmental beam; The movable end formwork is symmetrically arranged at both ends of the fixed support along its length and is adjustablely connected to the end of the fixed support. The movable end formwork moves to fit the end plane of the fixed support through its bottom movable structure to adapt to the outer contour of the steel reinforcement skeleton of different beam segments. The movable inner cavity frame is disposed above the base plate of the fixed support and located between the two movable end mold frames. The movable inner cavity frame can move horizontally and its height can be adjusted in the vertical direction. It is used to support the inner cavity of the segmental beam and define the inner cavity contour of the segmental beam's steel reinforcement skeleton.

[0004] Preferably, the movable end formwork includes a lifting trolley and a frame mounted on the lifting trolley. The lifting trolley can be raised and lowered and can move, thereby driving the frame to be raised and lowered and to move. The frame includes a box girder flange jig located at the top of the lifting trolley and a web plate jig located on the side of the lifting trolley. The box girder flange jig is adapted to the shape of the segmental beam flange.

[0005] Preferably, the movable inner cavity frame includes an adjustable sliding base, lifting rods, an inner cavity plate, limiting blocks, and an inner cavity crossbar. The bottom end of the adjustable sliding base is detachably mounted on the fixed bracket. The inner cavity plate is mounted on the adjustable sliding base via several vertically arranged lifting rods. Several limiting blocks are distributed at the top of the inner cavity plate. The inner cavity crossbar is detachably mounted in the slot of the limiting block. The inner cavity crossbar protrudes from the slot and is located on the inner cavity contour that abuts against the segmental beam reinforcement skeleton. A pad is provided in the slot below the inner cavity crossbar. Precise positioning can be achieved by adjusting the pads of different heights.

[0006] Preferably, the flange support frame and the web support frame of the box girder are provided with fixed comb teeth on the side facing the segmental beam. The fixed comb teeth are arranged along the spacing of the reinforcing bars and are used to accurately position the reinforcing bars.

[0007] Preferably, the lifting rod is equipped with a lubrication mechanism. The lifting rod includes an outer tube and an inner rod, with the inner rod slidably inserted inside the outer tube. The lubrication mechanism includes an oil reservoir, an oil injection pipe, a grease nipple, and a sealing ring. The oil reservoir is fixed to a fixed frame. The grease nipple is embedded in the side wall of the outer tube near the top. The inner end of the grease nipple communicates with the mating gap between the outer tube and the inner rod. One end of the oil injection pipe communicates with the bottom of the oil reservoir, and the other end is sealed to the grease nipple. An oil control valve is connected in series on the oil injection pipe. The sealing ring is fitted onto the outside of the inner rod and fixed at the top end of the outer tube. The inner wall of the sealing ring fits tightly against the outer wall of the inner rod to prevent impurities from entering the mating gap and to prevent lubricating oil leakage.

[0008] Preferably, it also includes a protective component, including an electric heat tracing plate and a drain needle. The electric heat tracing plate is attached and fixed to the outer wall of the oil reservoir. The outer side of the electric heat tracing plate is wrapped with a heat insulation layer. The electric heat tracing plate is electrically connected to an external power supply through a temperature control switch. The temperature control switch is preset to a start / stop threshold of 30°C to 40°C to maintain the fluidity of the lubricating oil. The drain needle is movably inserted through the side wall of the grease nipple. One end of the drain needle extends to the oil outlet of the grease nipple, and the other end protrudes from the grease nipple and is provided with a limiting block. Pulling the drain needle can mechanically unclog the impurities at the oil outlet.

[0009] The present invention also provides a construction method based on the aforementioned variable cross-section segmental beam reinforcement binding frame, comprising the following steps: Step 1: Based on the cross-sectional parameters of the variable cross-section segmental beam, adjust the movable end form so that the outline of the movable end form of the variable cross-section segmental beam reinforcement binding jig matches the outer outline of the reinforcement skeleton to be bound. Step 2: Based on the adjusted movable end formwork and the fixed support of the binding frame, use the fixed comb teeth on the movable end formwork to position the spacing of the reinforcing bars and complete the binding of the bottom web reinforcement of the segmental beam reinforcement skeleton. Step 3: Based on the internal cross-sectional parameters of the variable cross-section segmental beam, adjust the movable internal cavity support to ensure that the position of the movable internal cavity support precisely corresponds to the internal cavity position of the steel reinforcement cage to be tied. Step 4: Using the adjusted movable inner cavity frame, place the top plate reinforcement on the inner cavity crossbar, and use the fixed comb teeth to help position the reinforcement spacing to complete the binding of the top plate reinforcement of the segmental beam reinforcement skeleton, forming the reinforcement skeleton; Step 5: Remove the inner crossbar of the movable inner cavity frame and lift the formed steel reinforcement cage as a whole. After the lifting is completed, readjust the movable end formwork according to the cross-sectional parameters of the next variable cross-section segmental beam, and proceed to the binding construction of the steel reinforcement cage of the next segmental beam.

[0010] The present invention has at least the following beneficial effects: The jig device of the present invention mainly consists of a fixed support, a movable end formwork, and a movable inner cavity frame. The end formwork achieves the lifting and lowering and left and right movement of the flange portion of the jig through its bottom lifting trolley, adapting to different beam widths and variations; the inner cavity support can adapt to changes in the inner cavity cross-section and beam height through lifting rods and sliding bases. The movable jig allows one jig to be applicable to various beam cross-sections, offering strong adaptability and saving construction costs. Simultaneously, the jig is flexible in adjustment and can be quickly and accurately adjusted to its position without the need for additional inner cavity support, avoiding repeated erection and dismantling of supports, and greatly improving construction quality and efficiency. Furthermore, after the rebar is tied, the outer jig can be moved to the next rebar tying position using the trolley, achieving efficient utilization of the jig trolley.

[0011] Other advantages, objectives and features of the present invention will become apparent in part from the following description, and in part from those skilled in the art through study and practice of the invention. Attached Figure Description

[0012] Figure 1 This is a horizontal elevation view of the reinforcement binding frame for the variable cross-section segmental beam in this invention.

[0013] Figure 2 This is a schematic diagram of the structure of the movable end mold frame in this invention.

[0014] Figure 3 This is a schematic diagram of the movable inner cavity frame in this invention.

[0015] Figure 4 This is a schematic diagram of the adjustable sliding base and fixed bracket in this invention.

[0016] Figure 5 This is a longitudinal schematic diagram of the reinforcement binding frame for the variable cross-section segmental beam in this invention.

[0017] Figure 6 This is a schematic diagram of the lifting rod in this invention. Detailed Implementation

[0018] The present invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0019] The following description is intended to disclose the present invention and enable those skilled in the art to implement it. The preferred embodiments described below are merely examples, and other obvious modifications will occur to those skilled in the art. The basic principles of the invention defined in the following description can be applied to other embodiments, modifications, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the invention.

[0020] Those skilled in the art should understand that, in the disclosure of this invention, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limiting this invention.

[0021] It is understood that the term "a" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple, and the term "a" should not be understood as a limitation on the number.

[0022] like Figure 1-6 As shown, a preferred embodiment of the present invention provides a reinforcement binding frame for a variable cross-section segmental beam, including a fixed support 1, a movable end formwork 2, and a movable inner cavity frame 3; The top of the fixed bracket 1 is used to place the segmental beam steel reinforcement skeleton 4; The movable end mold 2 is symmetrically arranged at both ends of the fixed support 1 along its length and is adjustablely connected to the end of the fixed support 1. The movable end mold 2 moves to fit the end plane of the fixed support 1 through its bottom movable structure to adapt to the outer contour of the steel reinforcement skeleton 4 of different beam segments. The movable inner cavity frame 3 is disposed above the base plate of the fixed support 1 and is located between the two movable end mold frames 2. The movable inner cavity frame 3 can move horizontally and its height can be adjusted in the vertical direction. It is used to support the inner cavity of the segmental beam and define the inner cavity contour of the segmental beam steel reinforcement skeleton 4.

[0023] In the above implementation scheme, the fixed support 1 is the basic load-bearing structure of the variable cross-section segmental beam reinforcement binding jig, providing a stable support platform for the entire binding operation. Its top is used to directly place the segmental beam reinforcement skeleton 4, ensuring that the reinforcement skeleton is in a stable reference position during the binding process. The movable end formwork 2 is an adjustable structure set at both ends of the fixed support 1 in a symmetrical distribution. Through an adjustable connection with the end of the fixed support 1, it can flexibly adjust its position and state. The movable structure is the core adjustment component at the bottom of the movable end formwork 2, providing power and guidance for the movement of the movable end formwork 2, enabling it to accurately fit the end plane of the fixed support 1, thereby adapting to the outer contour shape of the segmental beam reinforcement skeleton 4 of different specifications. The movable inner cavity frame 3 is installed above the base plate of the fixed support 1 and located between the two movable end formwork 2. It is a key structure used to support the inner cavity of the segmental beam and define the inner contour of the reinforcement skeleton cavity. Its horizontal movement and vertical height adjustment functions can meet the construction needs of variable cross-section segmental beams with different inner cavity cross-sectional dimensions.

[0024] The present invention also provides the following technical solution: the movable end mold frame 2 includes a lifting trolley 2-1 and a frame 2-2 disposed on the lifting trolley 2-1. The lifting trolley 2-1 can be lifted and moved, thereby driving the frame 2-2 to be lifted and moved. The frame 2-2 includes a box girder flange mold 2-3 located at the top of the lifting trolley 2-1 and a web mold 2-3 located on the side of the lifting trolley 2-1. The box girder flange mold 2-3 is adapted to the shape of the segmental beam flange.

[0025] In the above implementation scheme, the lifting trolley 2-1 of the movable end formwork 2 can stably realize the lifting and moving actions of the frame 2-2. The box girder flange jig 2-3 is precisely adapted to the shape of the segmental beam flange, and the web plate jig includes a secondary plate fixed jig 2-4 and a secondary plate movable jig 2-5. The secondary plate fixed jig 2-4 is fixed to the frame, and the secondary plate movable jig moves along the secondary plate fixed jig to adjust the length of the secondary plate jig, thereby achieving flexible adaptation to changes in beam height. This allows the movable end formwork 2 to adapt to the binding operations of the steel reinforcement cage 4 of various variable cross-section segmental beams with different sizes and specifications.

[0026] The present invention also provides the following technical solution: the movable inner cavity frame 3 includes an adjustable sliding base 3-1, a lifting rod 3-2, an inner cavity plate 3-3, a limiting block 3-4, and an inner cavity crossbar 3-5. The bottom end of the adjustable sliding base 3-1 is detachably mounted on the fixed bracket 1. The inner cavity plate 3-3 is mounted on the adjustable sliding base 3-1 by several vertically arranged lifting rods 3-2. Several limiting blocks 3-4 are distributed at the top of the inner cavity plate 3-3. The inner cavity crossbar 3-5 is detachably mounted in the slot of the limiting block 3-4. The inner cavity crossbar 3-5 protrudes from the slot and is located on the inner cavity contour of the segmental beam steel reinforcement skeleton 4, which is upwardly abutting against it. A pad is provided in the slot below the inner cavity crossbar 3-5. The position can be accurately adjusted by adjusting the pads of different heights.

[0027] In the above implementation scheme, the movable inner cavity frame 3 has horizontal position adjustment and precise height adjustment functions, which can adapt to the binding operation of the segmental beam reinforcement cage 4 with different inner cavity cross-sectional dimensions. The cooperative design of the adjustable sliding base 3-1 and the waist elongated hole 1-1 on the fixed bracket 1 makes the horizontal position adjustment of the movable inner cavity frame 3 convenient and efficient, and firmly fixed, ensuring stability during construction. The lifting rod 3-2 realizes precise height adjustment, and combined with the fine adjustment of the position of the inner cavity crossbar 3-5 by different height pads, it can achieve precise definition of the inner cavity contour of the segmental beam reinforcement cage 4, effectively improving the accuracy of reinforcement cage binding. The detachable connection between the inner cavity crossbar 3-5 and the limiting block 3-4 makes it convenient to pull out the inner cavity crossbar 3-5 after the reinforcement cage is bound, which facilitates the overall lifting and moving of the reinforcement cage and improves construction efficiency.

[0028] The present invention also provides the following technical solution: the flange support frame 2-3 of the box girder and the web support frame are provided with fixed comb teeth 2-6 on the side facing the segmental beam. The fixed comb teeth 2-6 are arranged along the spacing of the reinforcing bars and are used to accurately position the reinforcing bars.

[0029] The above implementation scheme, by setting fixed comb teeth 2-6 adapted to the spacing of the reinforcing bars on the side of the box girder flange formwork 2-3 and the web formwork facing the segmental beam, enables rapid and precise positioning of the reinforcing bars during the reinforcing bar binding process. This eliminates the need for construction personnel to measure and adjust the position of each reinforcing bar individually, greatly improving the construction efficiency of reinforcing bar binding. Moreover, the fixed comb teeth 2-6 effectively restrict the displacement of the reinforcing bars, ensuring that the spacing between adjacent reinforcing bars always meets the design requirements, and avoiding the impact of reinforcing bar spacing deviations on the structural strength and load-bearing performance of the reinforcing bar cage.

[0030] The present invention also provides the following technical solution: the lifting rod 2-3 is equipped with a lubrication mechanism. The lifting rod 2-5 includes an outer tube 2-3-1 and an inner rod 2-3-2, the inner rod 2-3-2 being slidably inserted into the outer tube 2-3-1; the lubrication mechanism includes an oil reservoir 5-1, an oil injection pipe 5-2, a grease nipple 5-3, and a sealing ring 5-4. The oil reservoir 5-1 is fixed to the fixing frame 2-2, and the grease nipple 5-3 is embedded in the side wall of the outer tube 2-3-1 near the top. The inner end of 5-3 is connected to the mating gap between the outer tube 2-3-1 and the inner rod 2-3-2. One end of the oil injection pipe 5-2 is connected to the bottom of the oil reservoir 5-1, and the other end is sealed to the grease nipple 5-3. An oil control valve is connected in series on the oil injection pipe 5-2. The sealing ring 5-4 is fitted on the outside of the inner rod 2-3-2 and fixed at the top end of the outer tube 2-3-1. The inner wall of the sealing ring 5-4 is tightly fitted to the outer wall of the inner rod 2-3-2 to prevent impurities from entering the mating gap and to prevent lubricating oil leakage.

[0031] In the above implementation scheme, the oil injection pipe 5-2 is a high-pressure rubber hose. One end of it is sealed to the oil outlet at the bottom of the oil reservoir 5-1 via a connector, and the other end is also sealed to the grease nipple 5-3 via a connector, ensuring that the lubricating oil will not leak during transportation. An oil control valve is connected in series on the oil injection pipe 5-2, which can regulate the flow rate and on / off status of the lubricating oil. The sealing ring 5-4 is made of wear-resistant rubber material, and its inner ring diameter is adapted to the outer diameter of the inner rod 2-3-2. The sealing ring 5-4 is fitted onto the outside of the inner rod 2-3-2 and fixed to the top end of the outer pipe 2-3-1 by a pressure ring and bolts. The inner wall of the sealing ring 5-4 is tightly fitted to the outer wall of the inner rod 2-3-2, forming an effective sealing structure. During the use of the lifting rod 2-5, the oil control valve is opened periodically. The lubricating oil in the oil reservoir 5-1 is transported to the grease nipple 5-3 under the action of gravity through the oil injection pipe 5-2. Then, the grease nipple 5-3 is injected into the mating gap between the outer pipe 2-3-1 and the inner rod 2-3-2 to lubricate the sliding contact surfaces of the two and reduce the friction during relative sliding. The sealing ring 5-4 effectively prevents dust, sand and other impurities from the construction site from entering the mating gap, avoiding impurities from causing the lifting rod 2-5 to jam or aggravate wear. At the same time, it prevents the lubricating oil in the mating gap from leaking, ensuring the durability of the lubrication effect.

[0032] Furthermore, in this application, the lower ends of the outer tube 2-3-1 and the inner rod 2-3-2 are respectively provided with matching threads, and a threaded connection is adopted. This design with the threaded section at the bottom and the grease nipple and smooth mating section at the top allows the lubricating oil to enter the smooth mating gap at the top after being injected through the grease nipple, and then naturally penetrate downwards along the contact surface between the inner rod and the outer tube to the threaded mating section. This not only achieves comprehensive lubrication of the threads and sliding surfaces, but also avoids direct contact between the grease nipple and the threaded structure, thus completely avoiding interference in space.

[0033] The present invention also provides the following technical solution, which further includes a protective component, including an electric heat tracing plate 6-1 and a drain needle 6-2. The electric heat tracing plate 6-1 is attached and fixed to the outer wall of the oil reservoir 5-1. The outer side of the electric heat tracing plate 6-1 is wrapped with a heat insulation layer. The electric heat tracing plate 6-1 is electrically connected to an external power supply through a temperature control switch. The temperature control switch is preset to a start-stop threshold of 30°C to 40°C to maintain the fluidity of the lubricating oil. The drain needle 6-2 is movably inserted through the side wall of the grease nipple 5-3. One end of the drain needle 6-2 extends to the oil outlet of the grease nipple 5-3, and the other end is exposed outside the grease nipple 5-3 and is provided with a limiting block 6-3. Pulling the drain needle 6-2 can mechanically unclog the impurities at the oil outlet.

[0034] In the above implementation scheme, the electric heat tracing plate 6-1 is a flexible silicone electric heat tracing plate 6-1, the shape of which is adapted to the outer wall of the oil storage cylinder 5-1, and is fixedly attached to the outer wall of the oil storage cylinder 5-1. The coverage area of ​​the electric heat tracing plate 6-1 is not less than two-thirds of the area of ​​the outer wall of the oil storage cylinder 5-1, ensuring that the lubricating oil in the oil storage cylinder 5-1 can be heated evenly. The electric heat tracing plate 6-1 is wrapped with a heat insulation layer, which is made of rock wool insulation material and fixed with wrapping tape. This can effectively reduce the heat loss generated by the electric heat tracing plate 6-1, improve the heating and heat preservation effect, and at the same time prevent operators from accidentally touching the electric heat tracing plate 6-1 and being burned. The electric heat tracing plate 6-1 is electrically connected to an external power supply via a temperature control switch. The temperature control switch is a mechanical temperature controller, and its temperature sensor is inserted into the lubricating oil in the oil reservoir 5-1 to detect the temperature of the lubricating oil in real time. The temperature control switch has a preset start and stop threshold of 30℃ to 40℃. When the detected lubricating oil temperature is below 30℃, the temperature control switch automatically closes, and the electric heat tracing plate 6-1 is energized to heat the lubricating oil. When the lubricating oil temperature rises to 40℃, the temperature control switch automatically opens, and the electric heat tracing plate 6-1 stops heating, thereby maintaining the temperature of the lubricating oil between 30℃ and 40℃ to ensure that the lubricating oil has good fluidity. The unclogging needle 6-2 is made of stainless steel, with a diameter slightly smaller than the inner diameter of the grease nipple 5-3's outlet. The needle 6-2 is movably inserted through the side wall of the grease nipple 5-3, with one end extending into the outlet to reach any potential blockages. The other end protrudes from the outside of the grease nipple 5-3, and a stop block is welded to this exposed end. The diameter of the stop block is larger than that of the needle 6-2 and also larger than the diameter of the mounting hole on the side wall of the grease nipple 5-3, preventing the needle 6-2 from completely penetrating the grease nipple 5-3 during use and becoming impossible to remove. When a blockage is found in the grease nipple 5-3's outlet, hindering lubrication, the operator can hold the stop block and pull the needle 6-2 back and forth. The mechanical action of the needle 6-2 clears the blockages from the outlet, thus unclogging it.

[0035] This invention also provides a construction method based on the aforementioned variable cross-section segmental beam reinforcement binding frame, comprising the following steps: Step 1: Based on the cross-sectional parameters of the variable cross-section segmental beam, adjust the movable end form so that the outline of the movable end form of the variable cross-section segmental beam reinforcement binding jig matches the outer outline of the reinforcement skeleton to be bound. Before construction, the cross-sectional parameters of the variable cross-section segmental beam to be tied are obtained, including beam width, beam height, flange shape and dimensions. Based on these parameters, the movable end formwork 2 is adjusted. The lifting trolley 2-1 is driven to move the movable end formwork 2 left and right along the track, adjusting it to a position that matches the beam width. Then, the lifting mechanism of the lifting trolley 2-1 is activated to adjust the overall height of the movable end formwork 2 to match the beam height. For the lifting rod 2-5 on the web plate jig, the extension length of the inner rod 2-3-2 is adjusted to ensure that the web plate jig matches the outer contour of the web portion of the segmental beam. The box girder flange jig 2-3 achieves a close fit with the outer contour of the flange portion by means of a pre-set structure that matches the shape of the segmental beam flange. After adjustment, the connecting bolts between the movable end formwork 2 and the fixed bracket 1 are tightened to ensure that the contour of the movable end formwork 2 is completely matched with the outer contour of the steel reinforcement skeleton to be tied.

[0036] Step 2: Based on the adjusted movable end formwork 2 and the fixed support 1 of the binding frame, use the fixed comb teeth 2-6 on the movable end formwork 2 to position the spacing of the reinforcing bars and complete the binding of the bottom web reinforcement of the segmental beam reinforcement skeleton 4. Step 3: Based on the internal cross-sectional parameters of the variable cross-section segmental beam, adjust the movable internal cavity support so that the position of the movable internal cavity support 3 precisely corresponds to the internal cavity position of the steel reinforcement skeleton to be tied. Obtain the internal cross-sectional parameters of the variable cross-section segmental beam, including the internal cavity width and internal cavity height. Adjust the movable internal cavity frame 3 according to these parameters, pushing the adjustable sliding base 3-1 along the waist-length hole on the positioning steel plate to adjust the horizontal position of the movable internal cavity frame 3 to match the internal cavity width; then adjust the height of the lifting rod 3-2, thereby adjusting the height of the internal cavity plate 3-3 to match the internal cavity height; then, according to the precise positioning requirements of the internal cavity contour, select a pad of the corresponding height and place it in the slot of the limiting block 3-4, and install the internal cavity crossbar 3-5 on the pad in the slot, ensuring that the part of the internal cavity crossbar 3-5 protruding from the slot accurately corresponds to the internal cavity position of the steel reinforcement skeleton to be tied. After adjustment, fix the position of the movable internal cavity frame 3.

[0037] Step 4: Relying on the adjusted movable inner cavity frame 3, place the top plate reinforcement on the inner cavity crossbar 3-5, and use the fixed comb teeth 2-6 to assist in positioning the reinforcement spacing to complete the binding of the top plate reinforcement of the segmental beam reinforcement skeleton 4, forming the reinforcement skeleton; Step 5: Remove the inner crossbars 3-5 of the movable inner cavity frame 3 and lift the formed steel reinforcement cage as a whole. After the lifting is completed, readjust the movable end formwork 2 according to the cross-sectional parameters of the next variable cross-section segmental beam, and proceed to the binding construction of the steel reinforcement cage 4 of the next segmental beam.

[0038] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A variable cross-section segmental beam reinforcement tying jig characterized by, Includes a fixed bracket, a movable end mold frame, and a movable inner cavity frame; The top of the fixed bracket is used to place the steel reinforcement cage of the segmental beam; The movable end formwork is symmetrically arranged at both ends of the fixed support along its length and is adjustablely connected to the end of the fixed support. The movable end formwork moves to fit the end plane of the fixed support through its bottom movable structure to adapt to the outer contour of the steel reinforcement skeleton of different beam segments. The movable inner cavity frame is disposed above the base plate of the fixed support and located between the two movable end mold frames. The movable inner cavity frame can move horizontally and its height can be adjusted in the vertical direction. It is used to support the inner cavity of the segmental beam and define the inner cavity contour of the segmental beam's steel reinforcement skeleton.

2. The variable cross-section segmental beam steel reinforcement lashing jig frame according to claim 1, characterized in that, The movable end formwork includes a lifting trolley and a frame mounted on the lifting trolley. The lifting trolley can be raised and lowered and can move, thereby driving the frame to be raised and lowered and to move. The frame includes a box girder flange jig located at the top of the lifting trolley and a web plate jig located on the side of the lifting trolley. The box girder flange jig is adapted to the shape of the segmental beam flange.

3. The variable cross-section segmental beam steel reinforcement lashing jig frame according to claim 1, characterized in that, The movable inner cavity frame includes an adjustable sliding base, lifting rods, an inner cavity plate, limiting blocks, and an inner cavity crossbar. The bottom end of the adjustable sliding base is detachably mounted on the fixed bracket. The inner cavity plate is mounted on the adjustable sliding base via several vertically arranged lifting rods. Several limiting blocks are distributed at the top of the inner cavity plate, and the inner cavity crossbar is detachably mounted in the slot of the limiting block. The inner cavity crossbar protrudes from the slot and is located on the inner cavity contour that abuts against the segmental beam reinforcement skeleton. A pad is set in the slot below the inner cavity crossbar, and the position can be precisely adjusted by adjusting the pads of different heights.

4. The variable cross-section segmental beam steel reinforcement lashing cradle according to claim 2, characterized in that, The flange support frame and the web support frame of the box girder are provided with fixed comb teeth on the side facing the segmental beam. The fixed comb teeth are arranged along the spacing of the reinforcing bars and are used to accurately position the reinforcing bars.

5. The variable cross-section segmental beam steel reinforcement lashing cradle according to claim 2, characterized in that, The lifting rod is equipped with a lubrication mechanism. The lifting rod includes an outer tube and an inner rod, with the inner rod slidably inserted inside the outer tube. The lubrication mechanism includes an oil reservoir, an oil injection pipe, a grease fitting, and a sealing ring. The oil reservoir is fixed to a fixed frame. The grease fitting is embedded in the side wall of the outer tube near the top. The inner end of the grease fitting communicates with the mating gap between the outer tube and the inner rod. One end of the oil injection pipe communicates with the bottom of the oil reservoir, and the other end is sealed to the grease fitting. An oil control valve is connected in series on the oil injection pipe. The sealing ring is fitted onto the outside of the inner rod and fixed at the top end of the outer tube. The inner wall of the sealing ring fits tightly against the outer wall of the inner rod to prevent impurities from entering the mating gap and to prevent lubricating oil leakage.

6. The variable cross-section segmental beam steel reinforcement lashing cradle according to claim 5, characterized in that, It also includes protective components, which include an electric heat tracing plate and a drain needle. The electric heat tracing plate is attached and fixed to the outer wall of the oil reservoir. The outer side of the electric heat tracing plate is wrapped with a heat insulation layer. The electric heat tracing plate is electrically connected to an external power supply through a temperature control switch. The temperature control switch is preset to a start and stop threshold of 30°C to 40°C to maintain the fluidity of the lubricating oil. The drain needle is movably inserted through the side wall of the grease nipple. One end of the drain needle extends to the oil outlet of the grease nipple, and the other end is exposed outside the grease nipple and is provided with a limit stop. Pulling the drain needle can mechanically unclog the impurities at the oil outlet.

7. A construction method for the reinforcement binding frame of a variable cross-section segmental beam according to any one of claims 1-6, characterized in that, Includes the following steps: Step 1: Based on the cross-sectional parameters of the variable cross-section segmental beam, adjust the movable end form so that the outline of the movable end form of the variable cross-section segmental beam reinforcement binding jig matches the outer outline of the reinforcement skeleton to be bound. Step 2: Based on the adjusted movable end formwork and the fixed support of the binding frame, use the fixed comb teeth on the movable end formwork to position the spacing of the reinforcing bars and complete the binding of the bottom web reinforcement of the segmental beam reinforcement skeleton. Step 3: Based on the internal cross-sectional parameters of the variable cross-section segmental beam, adjust the movable internal cavity support to ensure that the position of the movable internal cavity support precisely corresponds to the internal cavity position of the steel reinforcement cage to be tied. Step 4: Using the adjusted movable inner cavity frame, place the top plate reinforcement on the inner cavity crossbar, and use the fixed comb teeth to help position the reinforcement spacing to complete the binding of the top plate reinforcement of the segmental beam reinforcement skeleton, forming the reinforcement skeleton; Step 5: Remove the inner crossbar of the movable inner cavity frame and lift the formed steel reinforcement skeleton as a whole. After the hoisting and relocation is completed, the movable end formwork is readjusted according to the cross-sectional parameters of the next variable cross-section segmental beam, and the binding construction of the steel reinforcement cage of the next segmental beam begins.

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