Shield segment steel reinforcement cage arc bending tooling

Abstract

The utility model discloses a kind of shield segment reinforcement cage bending arc tool, it is related to shield segment reinforcement cage processing equipment technical field, wherein, the shield segment reinforcement cage bending arc tool includes bending arc mechanism, bending arc setting mechanism and mounting mechanism, bending arc mechanism includes multiple discharge ports, bending arc mechanism is bent for main reinforcement arc;Bending arc setting mechanism is provided with multiple bending arc reinforcement setting groove and multiple strip through groove;Mounting mechanism includes multiple mounting parts, and the top of mounting part is preset with multiple tie bar;Mounting mechanism is set in the below of bending arc setting mechanism in lift. The utility model is bent by bending arc mechanism simultaneously bending arc multiple main reinforcement and simultaneously discharging, bending arc setting mechanism is set to main reinforcement and sets up tie bar installation passageway, mounting mechanism automatically jacks up main reinforcement and tie bar, reduces artificial handling and positioning operation. With the advantages of improving main reinforcement bending arc precision and efficiency, realizing tie bar automatic installation positioning, reducing manual intervention.

Description

Technical Field

[0001] This utility model relates to the technical field of equipment for processing steel cages for tunnel segments, and in particular to a tooling for bending steel cages for tunnel segments. Background Technology

[0002] With the rapid development of urban subway and tunnel construction, shield tunneling has become the mainstream technology for underground space development. As the main support structure of a shield tunnel, the quality of the shield segments directly affects the tunnel's safety and durability. The shield segment reinforcement cage is the core load-bearing component of the segment, welded together from multiple sets of main and tie bars arranged in a specific arc. Its manufacturing precision and efficiency have a significant impact on the overall shield tunneling progress.

[0003] Currently, the fabrication of the steel reinforcement cage for tunnel segments is mainly carried out using a combination of manual labor and machinery. Specifically, straight steel bars are first processed into the required curvature using bending equipment. Then, workers manually arrange the bent main reinforcement bars according to the design spacing. Next, tie bars are installed one by one and spot-welded for fixation. Finally, the entire structure is welded together.

[0004] However, the main reinforcement bars after bending require manual handling and shaping, which is labor-intensive and difficult to guarantee shaping accuracy, easily leading to uneven curvature of the reinforcement cage. Secondly, the installation of tie bars relies entirely on manual operation, which is not only inefficient but also presents challenges in positioning and inconsistent forming quality when multiple main reinforcement bars and tie bars are welded together. This makes it difficult to meet the demands of large-scale shield tunneling construction for rapid and accurate reinforcement cage fabrication. Utility Model Content

[0005] The main purpose of this utility model is to propose a bending tool for the steel cage of a tunnel segment, which aims to solve the problems of low bending accuracy, low efficiency of tie rod installation, poor process connection and unstable forming quality in the existing technology of the steel cage of a tunnel segment.

[0006] To achieve the above objectives, the present invention proposes a shield tunnel segment reinforcement cage bending fixture, wherein the shield tunnel segment reinforcement cage includes multiple reinforcement groups, the multiple reinforcement groups are arranged vertically at intervals, each reinforcement group includes multiple main bars and multiple tie bars, the multiple main bars are arranged horizontally at intervals, and the multiple tie bars are arranged at intervals along the extension direction of the main bars. The shield tunnel segment reinforcement cage bending fixture includes: The bending mechanism includes multiple discharge ports, the number of which is consistent with the number of main ribs and is set in a one-to-one correspondence. The bending mechanism is used to bend multiple main ribs and discharge the multiple bent main ribs through the corresponding discharge ports. The bending and shaping mechanism includes multiple bending and shaping grooves and multiple strip-shaped through grooves. The number of bending and shaping grooves corresponds to the number of discharge ports and is arranged one-to-one. Each bending and shaping groove is connected to the corresponding discharge port. Each bending and shaping groove has an arc-shaped structure adapted to the main reinforcing bar of the bend. The number of strip-shaped through grooves corresponds to the number of tie bars and is arranged one-to-one. The mounting mechanism includes multiple mounting parts, the number of which corresponds to the number of the strip-shaped through slots. Each mounting part has multiple tie rods pre-installed on its top. The mounting mechanism is vertically and flexibly positioned below the bending and shaping mechanism. The mounting mechanism is used to rise to an extended position, allowing each mounting part to extend through its corresponding strip-shaped through slot from the top of the bending and shaping mechanism, thereby pushing the multiple main ribs and tie rods of the bend out of the top of the bending and shaping mechanism. Alternatively, the mounting mechanism can be lowered to an initial position, allowing each mounting part to retract through its corresponding strip-shaped through slot below the bending and shaping mechanism for resetting.

[0007] In one embodiment, the mounting mechanism includes a mounting plate, a lifting drive, and multiple mounting components. The mounting components form the mounting section. The multiple mounting components are connected to the top of the mounting plate. Each mounting component extends vertically, and the mounting plate extends horizontally. The mounting plate is disposed below the bending and shaping mechanism. The free end of the lifting drive is connected to the mounting plate and is used to drive the mounting plate to raise the multiple mounting components to the top position, or to drive the mounting plate to lower the multiple mounting components to the initial position.

[0008] In one embodiment, the mounting assembly includes a mounting block and a surrounding edge, both extending vertically. The mounting block has a strip-shaped structure adapted to the strip-shaped through groove. The surrounding edge is connected to the top of the mounting block and extends along the periphery of the mounting block. The surrounding edge encloses a tie rod receiving cavity with a top opening. The surrounding edge has multiple limiting grooves, the number of which is the same as the number of the curved rebar shaping grooves and they are arranged in a one-to-one correspondence. The tie rod receiving cavity is used to pre-set the tie rod, and the limiting grooves are used for inserting the curved main rebar.

[0009] In one embodiment, the mounting mechanism further includes a plurality of limiting rods, which are spaced apart along the outer edge of the mounting plate, extend vertically, and slide in engagement with the outer edge of the mounting plate.

[0010] In one embodiment, the bending mechanism includes a support platform and a bending structure. The bending structure is slidably mounted on the top of the support platform in a horizontal direction. One side of the support platform is connected to one end of the bending shaping mechanism. The bending structure is provided with a plurality of discharge ports.

[0011] In one embodiment, the curved structure includes a rotary drive, a curved assembly, and multiple driven wheels. The multiple driven wheels are rotatably mounted on the top of the support platform and are arranged in a rectangular pattern to form a curved space. The rotary drive is slidably mounted on the top of the support platform in a horizontal direction. The curved assembly is connected to the rotary drive and is disposed within the curved space. The gap between the curved assembly and the multiple driven wheels forms multiple discharge ports. The rotary drive drives the curved assembly to rotate, causing the multiple main ribs to rotate via the curved assembly and the multiple driven wheels, thereby compressing the multiple main ribs to form multiple curved main ribs.

[0012] In one embodiment, the bending assembly includes a mounting frame and a plurality of drive wheels. The plurality of drive wheels are spaced apart in a horizontal direction and are rotatably mounted on the mounting frame. The number of drive wheels is the same as the number of main ribs. The mounting frame is mounted on the connecting end of the rotary drive member. The plurality of drive wheels are connected to the output end of the rotary drive member. The rotary drive member is used to drive the drive wheels to rotate, so that the plurality of main ribs drive the plurality of driven wheels to rotate via the corresponding drive wheels, thereby compressing the plurality of main ribs to form the plurality of bent main ribs.

[0013] In one embodiment, two adjacent driven wheels among the plurality of driven wheels are arranged at a distance along the horizontal direction, and the two adjacent driven wheels are arranged on opposite sides of the driving wheel to form a triangular structure, corresponding to the position of a driving wheel. The gap between the two adjacent driven wheels and the corresponding driving wheel forms a discharge port.

[0014] In one embodiment, the bending and shaping mechanism includes a support plate and a plurality of bending and shaping structures. The plurality of bending and shaping structures are spaced apart on the top of the support plate along the extension direction of the tie rod. The gap between two adjacent bending and shaping structures forms a bending and shaping groove for the tie rod. The support plate has a plurality of strip-shaped through grooves.

[0015] In one embodiment, the curved shaping structure includes a plurality of curved shaping blocks, which are spaced apart along the extension direction of the main rib of the curved arc. A clearance gap is formed between two adjacent curved shaping blocks at the position of a corresponding strip groove. The plurality of strip grooves are connected to the corresponding clearance gaps. Each curved shaping block has an arc-shaped structure adapted to the main rib of the curved arc.

[0016] This invention utilizes a bending mechanism to simultaneously bend multiple main reinforcing bars and discharge them concurrently. A bending and shaping mechanism shapes the main reinforcing bars and provides a channel for installing tie bars. An installation mechanism automatically lifts the tie bars and main reinforcing bars, reducing manual handling and positioning operations. Furthermore, the arc-shaped shaping groove ensures the consistency of the curvature of the multiple main reinforcing bars, and the pre-positioned tie bar lifting mechanism ensures welding position accuracy. The entire process is completed inside the tooling, effectively improving the forming efficiency and welding quality stability of the reinforcing cage. It solves the problems of low efficiency and poor accuracy of manual operation, and has the advantages of improving the bending accuracy and efficiency of main reinforcing bars, achieving automatic installation and positioning of tie bars, and reducing manual intervention. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0018] Figure 1 A schematic diagram of a structural embodiment of the shield tunnel segment reinforcement cage bending fixture provided by this utility model; Figure 2 This is a schematic diagram of a structure of an embodiment of the bending and shaping mechanism involved in this utility model; Figure 3 This is a schematic diagram of the structure of an embodiment of the bending mechanism involved in this utility model; Figure 4 This is a schematic diagram of an embodiment of the installation mechanism involved in this utility model.

[0019] Explanation of icon numbers: 100. Bending mechanism; 101. Discharge port; 102. Bending space; 110. Support platform; 120. Bending structure; 121. Rotary drive component; 122. Bending assembly; 123. Driven wheel; 124. Mounting frame; 125. Drive wheel; 200. Bending shaping mechanism; 201. Bending rebar shaping groove; 202. Strip through groove; 203. Clearance gap; 210. Support plate; 220. Bending shaping structure; 221. Bending shaping block; 300. Mounting mechanism; 301. Limiting groove; 302. Tie bar receiving cavity; 310. Mounting plate; 320. Lifting drive component; 330. Mounting assembly; 331. Mounting block; 332. Edge; 340. Limiting rod.

[0020] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0022] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0023] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0024] With the rapid development of urban subway and tunnel construction, shield tunneling has become the mainstream technology for underground space development. As the main support structure of a shield tunnel, the quality of the shield segments directly affects the tunnel's safety and durability. The shield segment reinforcement cage is the core load-bearing component of the segment, welded together from multiple sets of main and tie bars arranged in a specific arc. Its manufacturing precision and efficiency have a significant impact on the overall shield tunneling progress.

[0025] Currently, the fabrication of the steel reinforcement cage for tunnel segments is mainly carried out using a combination of manual labor and machinery. Specifically, straight steel bars are first processed into the required curvature using bending equipment. Then, workers manually arrange the bent main reinforcement bars according to the design spacing. Next, tie bars are installed one by one and spot-welded for fixation. Finally, the entire structure is welded together.

[0026] However, the main reinforcement bars after bending require manual handling and shaping, which is labor-intensive and difficult to guarantee shaping accuracy, easily leading to uneven curvature of the reinforcement cage. Secondly, the installation of tie bars relies entirely on manual operation, which is not only inefficient but also presents challenges in positioning and inconsistent forming quality when multiple main reinforcement bars and tie bars are welded together. This makes it difficult to meet the demands of large-scale shield tunneling construction for rapid and accurate reinforcement cage fabrication.

[0027] To solve this technical problem, this utility model proposes a tooling for bending the steel cage of a shield tunnel segment.

[0028] Please see Figure 1 and Figure 2 In one embodiment of the present invention, the shield tunnel segment reinforcement cage includes multiple reinforcement groups, the multiple reinforcement groups are arranged vertically at intervals, each reinforcement group includes multiple main bars and multiple tie bars, the multiple main bars are arranged horizontally at intervals, and the multiple tie bars are arranged at intervals along the extension direction of the main bars. The shield tunnel segment reinforcement cage bending fixture includes a bending mechanism 100, a bending shaping mechanism 200, and an installation mechanism 300. The bending mechanism 100 includes multiple discharge ports 101, the number of which corresponds to the number of main reinforcement bars. The bending mechanism 100 is used to bend multiple main reinforcement bars and discharge them through their corresponding discharge ports 101. The bending shaping mechanism 200 has multiple bending reinforcement shaping grooves 201 and multiple strip-shaped through-grooves 202. The number of bending reinforcement shaping grooves 201 corresponds to the number of discharge ports 101. Each bending reinforcement shaping groove 201 is connected to its corresponding discharge port 101, and each bending reinforcement shaping groove 201 has an arc-shaped structure adapted to the bending of the main reinforcement bars. The number of through slots 202 is consistent with the number of tie rods and is set one-to-one; the mounting mechanism 300 includes multiple mounting parts, the number of which is consistent with the number of through slots 202 and is set one-to-one, and multiple tie rods are pre-set on the top of the mounting parts; the mounting mechanism 300 is vertically and vertically set below the bending and shaping mechanism 200, and the mounting mechanism 300 is used to rise to the top position, so that each mounting part extends out of the top of the bending and shaping mechanism 200 through the corresponding through slot 202, so as to push out the multiple main ribs and multiple tie rods of the bend from the top of the bending and shaping mechanism 200, or the mounting mechanism 300 is used to descend to the initial position, so that each mounting part retracts back below the bending and shaping mechanism 200 through the corresponding through slot 202, so as to reset.

[0029] The bending mechanism 100 refers to a device that enables multiple main reinforcing bars to bend synchronously through a mechanical structure. Specifically, it can be implemented using a pressing mechanism with a driving wheel 125 and a driven wheel 123. The rotation of the driving wheel 125 drives the main reinforcing bars to bend into an arc shape. The bending and shaping mechanism 200 refers to a positioning device used to maintain the arc shape of the main reinforcing bars. Specifically, it can be implemented using a combination of shaping blocks with arc-shaped grooves, with the gap between adjacent shaping blocks forming a channel for installing the reinforcing bars. The installation mechanism 300 refers to a device that carries the pre-placed reinforcing bars and lifts them. Specifically, it can be implemented using a hydraulically driven lifting platform in conjunction with a strip-shaped installation block 331. The top of the installation block 331 is provided with a limiting groove 301 for positioning the main reinforcing bars.

[0030] More specifically, after the main reinforcing bar is simultaneously bent by the bending mechanism 100, it enters the arc-shaped groove of the bending and shaping mechanism 200 along the corresponding discharge port 101 for shaping. The installation part of the pre-placed tie bar is initially located below the shaping mechanism. After the lifting drive, the installation block 331 passes through the strip-shaped through slot 202 and pushes out, causing the main reinforcing bar to separate from the bent reinforcing bar shaping groove 201 and form a spatial intersection structure with the tie bar. At this time, the main reinforcing bar is confined to the groove at the top of the installation block 331, and the tie bar is in the predetermined welding position, which can be directly used for automated welding. After welding is completed, the installation mechanism 300 is reset, which facilitates the repositioning of the next set of tie bars.

[0031] Compared to existing technologies, traditional processes require manual handling of curved main reinforcing bars to the shaping table and adjustment of their positions one by one. This solution achieves automatic positioning through the corresponding design of the discharge port 101 and the curved reinforcing bar shaping groove 201. Existing tie bar installation relies on manual insertion by workers; this solution achieves batch positioning through a pre-set lifting mechanism for the tie bars, eliminating human error. Traditionally, after the shaping process is completed, the mold needs to be disassembled to remove the workpiece; this solution utilizes a liftable mounting section to automatically eject the workpiece, shortening process changeover time.

[0032] In the technical solution provided by this utility model, multiple main reinforcing bars are simultaneously bent and discharged by a bending mechanism 100, a bending and shaping mechanism 200 shapes the main reinforcing bars and sets up a tie bar installation channel, and an installation mechanism 300 automatically lifts the tie bars and main reinforcing bars, reducing manual handling and positioning operations. Furthermore, the bending and shaping groove 201 ensures the consistency of the curvature of multiple main reinforcing bars, and the pre-positioned tie bar lifting mechanism ensures welding position accuracy. The entire process is completed inside the tooling, effectively improving the forming efficiency and welding quality stability of the reinforcing cage, solving the problems of low efficiency and poor accuracy of manual operation, and has the advantages of improving the bending accuracy and efficiency of main reinforcing bars, realizing automatic installation and positioning of tie bars, and reducing manual intervention.

[0033] Please continue reading. Figure 1 And see Figure 4 In an embodiment of this utility model, the mounting mechanism 300 includes a mounting plate 310, a lifting drive 320, and multiple mounting components 330. The mounting components 330 form a mounting part, and the multiple mounting components 330 are connected to the top of the mounting plate 310. Each mounting component 330 extends vertically, and the mounting plate 310 extends horizontally. The mounting plate 310 is disposed below the bending and shaping mechanism 200. The free end of the lifting drive 320 is connected to the mounting plate 310 and is used to drive the mounting plate 310 to lift the multiple mounting components 330 to the top position, or to drive the mounting plate 310 to lower the multiple mounting components 330 to the initial position.

[0034] The mounting plate 310 is a horizontally extending plate-like structure, which can be made of steel or aluminum alloy, and is used to support multiple mounting components 330 and transmit lifting drive force. The lifting drive component 320 is an actuator that provides vertical power, which can be a hydraulic cylinder or an electric actuator, and its free end is rigidly connected to the mounting plate 310 via flanges or bolts. The mounting component 330 is a vertically extending positioning structure, which can be welded from rectangular steel or channel steel, with a pre-set structure at the top for fixing tie rods, and its bottom connected to the mounting plate 310 via welding or bolts.

[0035] More specifically, the mounting plate 310 is horizontally arranged below the bending and shaping mechanism 200, and multiple mounting components 330 are vertically fixed to the top of the mounting plate 310, forming mounting sections corresponding to the number of strip-shaped through slots 202. When the lifting drive 320 is activated, the mounting plate 310 drives all mounting components 330 to rise synchronously, allowing each mounting section to pass through the corresponding strip-shaped through slot 202 to reach the ejection position, ejecting the main bending rib and pre-set tie rod from the surface of the shaping mechanism. After welding is completed, the lifting drive 320 drives the mounting plate 310 to descend to the initial position, and the mounting components 330 are completely retracted below the shaping mechanism. At this time, tie rods can be pre-set on the top of the mounting section again. The entire lifting process achieves synchronous movement through the rigid connection between the drive and the mounting plate 310, avoiding the need for manual adjustment of the position of each mounting section.

[0036] This solution utilizes a combination structure of mounting plate 310 and lifting drive component 320 to enable multiple mounting components 330 to move synchronously. This achieves precise alignment of main reinforcement bars and tie bars at the ejected position and completes batch pre-setting of tie bars at the initial position, reducing manual intervention. It solves the problems of low efficiency and poor positioning accuracy in manual operation, realizing mechanized operation of tie bar pre-setting and main reinforcement bar ejection. Mounting plate 310 supports the synchronous movement of multiple mounting components 330, ensuring the consistency of the relative positions of all tie bars and main reinforcement bars; lifting drive component 320 provides stable power output, avoiding steel bar deformation caused by manual handling; the pre-set space created after the mounting components 330 retract allows for batch pre-installation of tie bars, shortening the process interval time.

[0037] Please continue reading. Figure 1 and Figure 4 In an embodiment of this utility model, the mounting component 330 includes a mounting block 331 and a surrounding edge 332. Both the mounting block 331 and the surrounding edge 332 extend vertically. The mounting block 331 has a strip-shaped structure adapted to the strip-shaped through groove 202. The surrounding edge 332 is connected to the top of the mounting block 331 and extends along the periphery of the mounting block 331. The surrounding edge 332 encloses and forms a tie rod receiving cavity 302 with a top opening. The surrounding edge 332 has multiple limiting grooves 301. The number of limiting grooves 301 is the same as the number of curved steel bar shaping grooves 201 and they are set one-to-one. The tie rod receiving cavity 302 is used to preset the tie rod, and the limiting grooves 301 are used for the insertion of the curved main reinforcement.

[0038] The mounting block 331 refers to a vertically extending strip-shaped component, which can be implemented using a rectangular cross-section metal block. Its width matches the width of the strip-shaped through slot 202 to ensure no displacement during lifting. The surrounding edge 332 refers to the frame structure surrounding the top edge of the mounting block 331, which can be formed by welding angle steel to create an open accommodating space. The tie rod accommodating cavity 302 refers to the U-shaped space enclosed by the surrounding edge 332. The cavity depth can be adjusted by setting side plates of different heights on the surrounding edge 332, and it is used to temporarily store the tie rods to be installed. The limiting groove 301 refers to the arc-shaped notch opened on the side wall of the surrounding edge 332, which can be formed by milling. Its curvature is consistent with the bending radius of the curved main rib, and it is used to restrain the horizontal displacement of the main rib.

[0039] More specifically, when the installation mechanism 300 is in its initial position, the tie rod is pre-placed in the tie rod receiving cavity 302. The installation block 331 moves vertically along the strip-shaped through groove 202 under the drive of the lifting drive component 320, and the limiting groove 301 on the side wall of the perimeter 332 forms a continuous positioning channel with the curved rebar shaping groove 201. After the main rebar is formed by the bending mechanism 100, its outer wall is inserted into the limiting groove 301, at which point the curvature of the main rebar matches the arc structure of the curved rebar shaping groove 201. During the lifting process, the installation block 331 drives the perimeter 332 to rise synchronously, and the tie rod is pushed out to the plane where the main rebar is located. The limiting groove 301 continuously constrains the position of the main rebar, ensuring that the intersection point of the tie rod and the main rebar maintains a preset distance.

[0040] This application utilizes the tie-reinforcing cavity 302 formed by the perimeter 332 to achieve batch pre-positioning of multiple tie bars. Combined with the horizontal constraint of the main reinforcement bars by the limiting groove 301, the contact points between the tie bars and the main reinforcement bars are automatically aligned. In the prior art, the main reinforcement bars are prone to positional displacement during ejection. However, this application utilizes the matching relationship between the arc contour of the limiting groove 301 and the bending shape of the main reinforcement bars to maintain the positioning accuracy of the main reinforcement bars during ejection. This achieves batch pre-positioning and accurate positioning of tie bars, solving the problems of low installation efficiency and large positioning deviation at intersection points in manual operation. The main reinforcement bars are always constrained by the limiting groove 301 during ejection, avoiding arc deformation caused by their own weight and ensuring the overall forming accuracy of the steel cage. The perimeter 332 structure also serves as a temporary fixation for the tie bars, preventing them from slipping during lifting and providing a stable assembly benchmark for subsequent welding operations.

[0041] Please continue reading. Figure 1 and Figure 4 In an embodiment of this utility model, the mounting mechanism 300 further includes a plurality of limiting rods 340, which are spaced apart along the outer edge of the mounting plate 310, and all of the limiting rods 340 extend vertically and slide in cooperation with the outer edge of the mounting plate 310.

[0042] The limiting rod 340 refers to a vertical rod-like structure set along the outer edge of the mounting plate 310. It can be implemented using a cylindrical metal rod or a rectangular steel bar. Its function is to limit the horizontal displacement of the mounting plate 310 during lifting and lowering, ensuring the verticality of the lifting trajectory. The sliding fit refers to the clearance fit or guide sleeve connection between the limiting rod 340 and the outer edge of the mounting plate 310. This can be implemented using a slide rail and slider structure or a guide rod and bushing structure. Its function is to allow the mounting plate 310 to slide axially along the limiting rod 340 while limiting radial offset.

[0043] More specifically, when the lifting drive component 320 pushes the mounting plate 310 to move up and down, the sliding engagement between the limiting rod 340 and the outer edge of the mounting plate 310 forms a guiding constraint. During the upward movement of the mounting plate 310, the rigid support of the limiting rod 340 can effectively counteract the lateral force generated by the frictional resistance between the main reinforcement and the curved reinforcement shaping groove 201, preventing the mounting plate 310 from shifting horizontally. During the descent and reset phase, the guiding effect of the limiting rod 340 ensures that the mounting assembly 330 accurately returns to its initial position, avoiding misalignment and interference between the mounting block 331 and the strip through groove 202. This structure ensures that multiple sets of mounting assemblies 330 maintain synchronous vertical movement during the lifting process, providing a spatial reference for the precise positioning of the tie rods and main reinforcement.

[0044] This solution utilizes a dual-guiding mechanism formed by the sliding engagement of the limiting rod 340 and the mounting plate 310 to automatically correct the movement trajectory of the mounting plate 310 without manual intervention, thus resolving the stability issue when multiple mounting components 330 are raised and lowered synchronously. It effectively controls the horizontal displacement deviation of the mounting mechanism 300 during the raising and lowering process, ensuring that the pre-installed tie bars on the mounting components 330 accurately pass through the strip groove 202 and perpendicularly intersect with the curved main reinforcement bars. This provides a more precise spatial positioning reference for subsequent welding operations, significantly improving the welding quality and assembly efficiency of the rebar cage.

[0045] Please continue reading. Figure 1 And see Figure 3 In an embodiment of this utility model, the bending mechanism 100 includes a support platform 110 and a bending structure 120. The bending structure 120 is slidably mounted on the top of the support platform 110 in the horizontal direction. One side of the support platform 110 is connected to one end of the bending shaping mechanism 200. The bending structure 120 is provided with a plurality of discharge ports 101.

[0046] The support platform 110 is the base platform that supports the curved structure 120. It can be implemented using a welded steel frame, and its top plane provides a reference surface for the sliding installation of the curved structure 120. The curved structure 120 is the functional module that performs the bending operation of the reinforcing bars. It can be implemented using a rotary drive device with a drive wheel 125. The drive wheel 125 and the driven wheel 123 cooperate to form a space for compressing the reinforcing bars. Sliding installation in the horizontal direction means that the curved structure 120 is movably connected to the support platform 110 via guide rails or grooves. Position adjustment can be achieved using a roller assembly and guide groove. The discharge port 101 is the channel for discharging the bent reinforcing bars. It can be formed by the gap between the drive wheel 125 and the driven wheel 123, and its number corresponds to the number of main reinforcing bars.

[0047] More specifically, the support platform 110, as a basic load-bearing component, has a horizontal sliding assembly installed on its top plane. The bending structure 120 achieves displacement adjustment along the extension direction of the reinforcing bar through the sliding assembly. This structure contains a rotary drive unit and a bending assembly 122. When the main reinforcing bar is fed into the bending mechanism 100, the bending structure 120 adjusts its horizontal position according to the curvature design requirements of the reinforcing cage. Subsequently, the rotary drive unit drives the drive wheel 125 to perform a bending operation on the main reinforcing bar. During the bending process, the main reinforcing bar forms a predetermined curvature under the squeezing action of the drive wheel 125 and the driven wheel 123, and is discharged directionally through the discharge port 101 formed by the gap between them. The connection end between the support platform 110 and the bending shaping mechanism 200 forms a positioning reference, ensuring that the bent main reinforcing bar can accurately enter the bending reinforcing bar shaping groove 201.

[0048] This solution, through the cooperation of the support platform 110 and the sliding bending structure 120, achieves dynamic adjustment of the bending position, solving the problem of insufficient equipment adaptability when processing steel cages of different specifications. It realizes the adjustability of the main reinforcement bending position, effectively improving bending accuracy and processing efficiency. The sliding connection design between the bending structure 120 and the support platform 110 allows the equipment to quickly adapt to processing requirements of different arc lengths, avoiding the repeated disassembly and assembly problems caused by fixed molds in traditional equipment. The direct docking of the discharge port 101 with the shaping mechanism reduces the deformation risk during steel reinforcement transfer, providing stable arc maintenance for subsequent shaping processes.

[0049] Please continue reading. Figure 3In an embodiment of this utility model, the curved structure 120 includes a rotary drive 121, a curved assembly 122, and multiple driven wheels 123. The multiple driven wheels 123 are rotatably mounted on the top of the support platform 110. The multiple driven wheels 123 are rectangularly distributed and enclose a curved space 102. The rotary drive 121 is slidably mounted on the top of the support platform 110 in the horizontal direction. The curved assembly 122 is connected to the rotary drive 121 and is disposed within the curved space 102. The gap between the curved assembly 122 and the multiple driven wheels 123 forms multiple discharge ports 101. The rotary drive 121 is used to drive the curved assembly 122 to rotate, so that the multiple main ribs are driven by the curved assembly 122 to rotate the multiple driven wheels 123, thereby compressing the multiple main ribs to form multiple curved main ribs.

[0050] The rotary drive component 121 is a power device that drives the bending assembly 122 to rotate. It can be implemented using a hydraulic motor or a servo motor. Its horizontal sliding function is achieved through the cooperation of a guide rail and a slider, used to adjust the relative position between the bending assembly 122 and the driven wheel 123. The bending assembly 122 is a transmission structure including a drive wheel 125. The drive wheel 125 is connected to the rotary drive component 121 via a mounting bracket 124. Its rotation is achieved through gear transmission or belt transmission, used to apply radial pressure to the main rib. The driven wheel 123 is an auxiliary roller arranged around the bending assembly 122. It specifically uses a bearing structure to achieve low-friction rotation. Its rectangular distribution forms a symmetrical bending space 102, used to cooperate with the drive wheel 125 to form a uniform compression effect.

[0051] More specifically, when the main rib enters the bending space 102, the rotary drive 121 drives the drive wheel 125 in the bending assembly 122 to rotate at high speed. The drive wheel 125 contacts the main rib, generating friction and driving the main rib forward. During this process, the main rib is simultaneously constrained by the driven wheel 123. Since the drive wheel 125 and the driven wheel 123 are triangularly distributed, the main rib undergoes plastic deformation under the pressure of the rollers in three directions, forming a predetermined arc. The horizontal sliding function of the rotary drive 121 can adjust the distance between the drive wheel 125 and the driven wheel 123, thereby adapting to the processing requirements of main ribs with different diameters. The gap between the bending assembly 122 and the driven wheel 123 forms the discharge port 101, through which the bent main rib is discharged, ensuring that no jamming occurs during continuous processing.

[0052] This solution utilizes a sliding rotary drive component 121 in conjunction with an adjustable driven wheel 123 to achieve dynamic adjustment of processing parameters. Simultaneously, the triangular arrangement of the drive wheel 125 and driven wheel 123 ensures more even stress distribution on the main reinforcement bars, avoiding localized stress concentrations caused by traditional two-point bending. This effectively solves the problems of uneven curvature and low processing efficiency during the bending of the main reinforcement bars, enabling simultaneous continuous bending processing of multiple main reinforcement bars. The synergistic effect of the drive wheel 125 and driven wheel 123 ensures the consistency of the bending radius of the main reinforcement bars, while the adjustability of the rotary drive component 121 allows the equipment to adapt to the processing requirements of different specifications of steel bars, significantly improving the standardization of shield tunnel segment reinforcement cage production.

[0053] Please continue reading. Figure 3 In an embodiment of this utility model, the bending assembly 122 includes a mounting frame 124 and multiple drive wheels 125. The multiple drive wheels 125 are spaced apart in the horizontal direction. All drive wheels 125 are rotatably mounted on the mounting frame 124. The number of drive wheels 125 is the same as the number of main ribs. The mounting frame 124 is mounted on the connecting end of the rotary drive 121. All drive wheels 125 are connected to the output end of the rotary drive 121. The rotary drive 121 is used to drive the drive wheels 125 to rotate, so that the multiple main ribs drive the multiple driven wheels 123 to rotate via the corresponding drive wheels 125, so as to compress the multiple main ribs to form multiple curved main ribs.

[0054] The mounting frame 124 refers to the support structure for supporting the drive wheel 125, which can be implemented using a frame structure welded from steel plates. Its function is to provide a stable mounting base for the drive wheel 125. The drive wheel 125 is the rotating component that directly contacts the main rib, which can be implemented using a metal roller with anti-slip texture on its surface. Bending drive is achieved through frictional contact with the surface of the main rib. The rotary drive component 121 is the device that provides rotational power, which can be implemented using a servo motor or a hydraulic motor. Its function is to transmit power to the drive wheel 125 through the output shaft.

[0055] More specifically, the mounting frame 124 is bolted to the output end of the rotary drive 121, and multiple drive wheels 125 are arranged in parallel and mounted on the horizontal beam of the mounting frame 124. When the main rib is fed into the bending space 102, the rotary drive 121 starts and drives the drive wheels 125 to rotate at high speed. After the drive wheels 125 come into contact with the main rib, they pull the main rib forward through friction. During this process, the main rib is squeezed by the triangular gap formed by the drive wheels 125 and the driven wheels 123, and gradually undergoes plastic deformation to form a preset curvature. Since each drive wheel 125 corresponds to one main rib, multiple main ribs can complete the bending process simultaneously, ensuring the consistency of the curvature of each main rib.

[0056] This solution achieves synchronous bending of multiple main reinforcing bars by setting up an active wheel 125 matching the number of main reinforcing bars, which, together with the driven wheel 123, forms a triangular extrusion structure, eliminating curvature errors caused by manual intervention. It solves the problems of low bending efficiency and poor curvature consistency for multiple main reinforcing bars, achieving synchronous bending and forming of the main reinforcing bars. The triangular layout of the active wheel 125 and driven wheel 123 enhances the stress stability of the main reinforcing bars during bending, preventing displacement or twisting during bending, thereby improving the overall welding accuracy of the reinforcing cage.

[0057] Please continue reading. Figure 3 In an embodiment of this utility model, two adjacent driven wheels 123 are arranged at intervals in the horizontal direction. The positions of the two adjacent driven wheels 123 corresponding to the positions of a driving wheel 125 are arranged on opposite sides of the driving wheel 125 and form a triangular structure. The gap between the two adjacent driven wheels 123 and the corresponding driving wheel 125 forms a discharge port 101.

[0058] The driven wheel 123 is an auxiliary rotating component used to cooperate with the driving wheel 125 in bending the main rib. It can be implemented using a metal roller with anti-slip textured surface, and its spacing creates a stable bending space 102. The triangular structure refers to the spatial arrangement between two adjacent driven wheels 123 and the driving wheel 125. This can be achieved by adjusting the installation position of the driven wheels 123, which enhances the force balance during the bending process of the main rib. The discharge port 101 is a channel for discharging the bent main rib. It can be formed by the gap between the driving wheel 125 and the driven wheel 123, and its width can be adjusted according to the diameter of the main rib to ensure smooth passage and avoid excessive compression.

[0059] More specifically, during the bending process, the main rib is fed into the triangular space formed by the driving wheel 125 and the driven wheels 123 on both sides. The driving wheel 125 rotates, driving the main rib to move, while the driven wheels 123 apply lateral pressure to the main rib through their rotation. Due to the symmetrical layout of the triangular structure, the compressive force on the main rib is evenly distributed during bending, avoiding curvature deviation caused by stress concentration on one side. After bending, the main rib is stably discharged through the gap between the driving wheel 125 and the driven wheels 123. The size of this gap is designed to accommodate main ribs of different diameters, ensuring smooth discharge and preventing surface scratches.

[0060] Compared to existing technologies, traditional bending equipment typically uses a linear arrangement of driven wheels 123, which can easily lead to localized deformation of the main reinforcing bars due to uneven stress during bending. However, with a triangular structural layout, the main reinforcing bars are positioned at three points by the driving wheel 125 and the driven wheels 123 on both sides during bending, effectively constraining lateral deviation and significantly improving bending accuracy. Furthermore, traditional equipment often uses an open discharge channel, which can easily cause friction between the main reinforcing bars and the equipment during discharge. This solution, however, uses a directional discharge port 101 formed by the gap between the driving wheel 125 and the driven wheels 123 to guide the main reinforcing bars along a preset path, reducing friction loss. This application solves the problem of curvature deviation caused by uneven stress on the main reinforcing bars in traditional bending equipment, while also optimizing the discharge structure to avoid surface damage to the main reinforcing bars. The triangular arrangement of the driven wheels 123 and the driving wheel 125 significantly improves the stability of bending processing, ensuring the curvature consistency of multiple main reinforcing bars and laying the foundation for precise assembly of the subsequent reinforcing cage.

[0061] Please continue reading. Figure 1 , Figure 2 and Figure 4 In an embodiment of this utility model, the curved shaping mechanism 200 includes a support plate 210 and a plurality of curved shaping structures 220. The plurality of curved shaping structures 220 are spaced apart on the top of the support plate 210 along the extension direction of the tie bar. The gap between two adjacent curved shaping structures 220 forms a curved steel bar shaping groove 201. The support plate 210 has a plurality of strip-shaped through grooves 202.

[0062] The support plate 210 is the base component that supports the curved shaping structure 220. It can be made of steel plate or precast concrete slab, and its surface flatness ensures the positioning accuracy of the curved shaping structure 220. The curved shaping block 221 is a modular component used to constrain the curvature of the main reinforcement. It can be cast from chrome-plated alloy steel, and its arc contour perfectly matches the designed curvature of the main reinforcement. The clearance gap 203 is a vertical channel reserved between adjacent curved shaping blocks 221. Its width can be set slightly larger than the cross-sectional dimensions of the installation part, for example, 50-80 mm, to allow passage during the lifting and lowering of the installation part. The strip groove 202 is a longitudinal opening penetrating the support plate 210. It can be formed by CNC cutting, and its length direction is consistent with the extension direction of the tie rod, used to guide the installation part to move along a predetermined trajectory.

[0063] More specifically, the curved shaping blocks 221 are arranged at intervals along the extension direction of the main reinforcement to form a continuous arc-shaped guide surface. Under the action of gravity, the main reinforcement after bending naturally falls into the curved reinforcement shaping groove 201 between adjacent curved shaping blocks 221. At this time, the curvature of the main reinforcement is completely constrained by the arc surface of the curved shaping blocks 221. When the installation mechanism 300 rises, the installation part passes through the strip through groove 202 of the support plate 210 and the clearance gap 203 between the curved shaping blocks 221, pushing the tie rod pre-placed on the top of the installation part upward, so that the contact surface of the tie rod and the main reinforcement is automatically aligned. Since the clearance gap 203 is connected to the strip through groove 202, the lifting path of the installation part is precisely defined, avoiding the error of manual adjustment and positioning.

[0064] In some specific embodiments, the curved shaping block 221 can be designed as a split unit. For example, a single curved shaping block 221 can be divided into a base and a replaceable arc-shaped pad. The radius of curvature of the arc-shaped pad can be quickly changed according to different engineering requirements. A guide rail can be provided at the bottom of the support plate 210 to form a sliding engagement with the limiting rod 340 of the mounting mechanism 300, further ensuring the stability of the lifting process.

[0065] Compared to existing technologies, traditional processes require manual adjustment and temporary fixing of the main reinforcing bars after bending. This solution, however, uses modular bending shaping blocks 221 to form continuous bending rebar shaping grooves 201, allowing the main reinforcing bars to automatically fall into their predetermined positions. Existing technologies require manual insertion of tie bars into the gaps between the main reinforcing bars during installation. This solution utilizes the through-structure of the clearance gap 203 and the strip-shaped through-slot 202, allowing the installation unit to directly lift the tie bars to the welding position, reducing the operation to a single lifting action. Through these technical solutions, the main reinforcing bars can be quickly and accurately positioned to the designed curvature after bending, and the continuous guide surface formed by the bending shaping blocks 221 eliminates curvature deviations between the main reinforcing bars. The installation unit achieves automatic alignment of the tie bars through the cooperation of the clearance gap 203 and the strip-shaped through-slot 202, avoiding positioning errors during manual insertion. The combined structure of the support plate 210 and the bending shaping blocks 221 gives the tooling modular expansion capabilities, allowing for adaptation to the processing needs of rebar cages of different sizes by increasing or decreasing the number of bending shaping blocks 221.

[0066] Please continue reading. Figure 1 , Figure 2 and Figure 4 In an embodiment of this utility model, the curved shaping structure 220 includes a plurality of curved shaping blocks 221. The plurality of curved shaping blocks 221 are spaced apart along the extension direction of the main rib of the curved arc. A clearance gap 203 is formed between two adjacent curved shaping blocks 221 at the position of a corresponding strip through groove 202. The plurality of strip through grooves 202 are connected to the corresponding clearance gaps 203. Each curved shaping block 221 has an arc-shaped structure adapted to the main rib of the curved arc.

[0067] The curved shaping block 221 refers to the shaping component arranged at intervals along the extension direction of the main rib. It can be formed by cutting segmented arc-shaped steel plates and is used for multi-point positioning and support of the main rib after bending. The clearance gap 203 refers to the space formed between adjacent curved shaping blocks 221, which can be achieved by adjusting the spacing of the curved shaping blocks 221, providing a channel for the lifting and lowering movement of the installation part. The strip-shaped slot 202 refers to the elongated opening penetrating the curved shaping mechanism 200, which can be formed by CNC cutting and is used to allow the installation part to move along a predetermined path during lifting and lowering. The arc-shaped structure refers to the contour of the curved shaping block 221 matching the curvature of the main rib, which can be achieved through contour machining or mold casting, ensuring the shape accuracy of the main rib after bending.

[0068] More specifically, multiple curved shaping blocks 221 are arranged at intervals along the extension direction of the main reinforcement, and the clearance gaps 203 formed between adjacent blocks are connected to the strip-shaped through grooves 202. When the main reinforcement enters the curved reinforcement shaping groove 201 after being processed by the curved mechanism 100, the curved shaping blocks 221 with their arc-shaped structures provide multi-point constraints on the main reinforcement to avoid local deformation. During the upward movement of the installation mechanism 300, the installation part passes through the strip-shaped through grooves 202 and the clearance gaps 203, pushing the main reinforcement and the pre-placed tie rods out of the shaping mechanism. The segmented curved shaping block 221 design ensures the consistency of the curvature of the main reinforcement and provides lifting space for the installation part.

[0069] Compared with existing technologies, traditional integral shaping molds cannot form clearance 203, requiring manual adjustment of the main reinforcement position during tie rod installation. However, the segmented curved shaping block 221, through the cooperation of clearance 203 and strip-shaped through-slot 202, ensures the main reinforcement maintains a stable posture during ejection, preventing secondary deformation. Through this technical solution, this application achieves synchronous positioning and ejection of the main reinforcement and tie rods, solving the welding misalignment problem caused by manual adjustment of the main reinforcement position. Simultaneously, the segmented shaping structure reduces the difficulty of mold processing and improves the forming efficiency of the rebar cage.

[0070] The above description is merely an exemplary embodiment of the present utility model and does not limit the scope of protection of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the scope of protection of the present utility model.

Claims

1. A tooling for bending the reinforcing cage of a shield tunnel segment, characterized in that, The shield tunnel segment reinforcement cage includes multiple reinforcement groups, which are arranged vertically at intervals. Each reinforcement group includes multiple main bars and multiple tie bars. The main bars are arranged horizontally at intervals, and the tie bars are arranged at intervals along the extension direction of the main bars. The shield tunnel segment reinforcement cage bending fixture includes: The bending mechanism includes multiple discharge ports, the number of which is consistent with the number of main ribs and is set in a one-to-one correspondence. The bending mechanism is used to bend multiple main ribs and discharge the multiple bent main ribs through the corresponding discharge ports. The bending and shaping mechanism includes multiple bending and shaping grooves and multiple strip-shaped through grooves. The number of bending and shaping grooves corresponds to the number of discharge ports and is arranged one-to-one. Each bending and shaping groove is connected to the corresponding discharge port. Each bending and shaping groove has an arc-shaped structure adapted to the main reinforcing bar of the bend. The number of strip-shaped through grooves corresponds to the number of tie bars and is arranged one-to-one. The mounting mechanism includes multiple mounting parts, the number of which corresponds to the number of the strip-shaped through slots. Each mounting part has multiple tie rods pre-installed on its top. The mounting mechanism is vertically and flexibly positioned below the bending and shaping mechanism. The mounting mechanism is used to rise to an extended position, allowing each mounting part to extend through its corresponding strip-shaped through slot from the top of the bending and shaping mechanism, thereby pushing the multiple main ribs and tie rods of the bend out of the top of the bending and shaping mechanism. Alternatively, the mounting mechanism can be lowered to an initial position, allowing each mounting part to retract through its corresponding strip-shaped through slot below the bending and shaping mechanism for resetting.

2. The shield tunnel segment reinforcement cage bending fixture as described in claim 1, characterized in that, The installation mechanism includes a mounting plate, a lifting drive component, and multiple installation components. The installation components form the mounting section. The multiple installation components are connected to the top of the mounting plate. Each installation component extends vertically, and the mounting plate extends horizontally. The mounting plate is located below the bending and shaping mechanism. The free end of the lifting drive component is connected to the mounting plate and is used to drive the mounting plate to raise the multiple installation components to the top position, or to drive the mounting plate to lower the multiple installation components to the initial position.

3. The shield tunnel segment reinforcement cage bending fixture as described in claim 2, characterized in that, The mounting assembly includes a mounting block and a surrounding edge, both extending vertically. The mounting block has a strip-shaped structure adapted to the strip-shaped through groove. The surrounding edge is connected to the top of the mounting block and extends along the periphery of the mounting block, forming a tie rod receiving cavity with a top opening. The surrounding edge has multiple limiting grooves, the number of which corresponds to the number of the curved rebar shaping grooves. The tie rod receiving cavity is used to pre-set the tie rod, and the limiting grooves are used for inserting the curved main rebar.

4. The shield tunnel segment reinforcement cage bending fixture as described in claim 2, characterized in that, The installation mechanism also includes multiple limiting rods, which are spaced apart along the outer edge of the mounting plate, extend vertically, and slide in cooperation with the outer edge of the mounting plate.

5. The shield tunnel segment reinforcement cage bending fixture as described in any one of claims 1 to 4, characterized in that, The bending mechanism includes a support platform and a bending structure. The bending structure is slidably mounted on the top of the support platform in a horizontal direction. One side of the support platform is connected to one end of the bending shaping mechanism. The bending structure is provided with multiple discharge ports.

6. The shield tunnel segment reinforcement cage bending fixture as described in claim 5, characterized in that, The curved structure includes a rotary drive, a curved assembly, and multiple driven wheels. The multiple driven wheels are rotatably mounted on the top of the support platform. The multiple driven wheels are rectangularly distributed and enclose a curved space. The rotary drive is slidably mounted on the top of the support platform in a horizontal direction. The curved assembly is connected to the rotary drive and is disposed within the curved space. The gap between the curved assembly and the multiple driven wheels forms multiple discharge ports. The rotary drive is used to drive the curved assembly to rotate, causing the multiple main ribs to rotate via the curved assembly and the multiple driven wheels, thereby compressing the multiple main ribs to form multiple curved main ribs.

7. The shield tunnel segment reinforcement cage bending fixture as described in claim 6, characterized in that, The bending assembly includes a mounting frame and multiple drive wheels. The drive wheels are spaced apart in a horizontal direction and are rotatably mounted on the mounting frame. The number of drive wheels is the same as the number of main ribs. The mounting frame is mounted on the connecting end of the rotary drive component. The drive wheels are connected to the output end of the rotary drive component. The rotary drive component drives the drive wheels to rotate, causing the multiple main ribs to rotate via the corresponding drive wheels, thereby compressing the multiple main ribs to form multiple curved main ribs.

8. The shield tunnel segment reinforcement cage bending fixture as described in claim 7, characterized in that, Two adjacent driven wheels are arranged at horizontal intervals, and the two adjacent driven wheels are positioned on opposite sides of the driving wheel to form a triangular structure, corresponding to the position of a driving wheel. The gap between the two adjacent driven wheels and the corresponding driving wheel forms a discharge port.

9. The shield tunnel segment reinforcement cage bending fixture as described in any one of claims 1 to 4, characterized in that, The bending and shaping mechanism includes a support plate and multiple bending and shaping structures. The multiple bending and shaping structures are spaced apart on the top of the support plate along the extension direction of the tie rod. The gap between two adjacent bending and shaping structures forms a bending and shaping groove for the steel bar. The support plate has multiple strip-shaped through grooves.

10. The shield tunnel segment reinforcement cage bending fixture as described in claim 9, characterized in that, The curved shaping structure includes multiple curved shaping blocks, which are spaced apart along the extension direction of the main rib of the curved arc. A clearance gap is formed between two adjacent curved shaping blocks at the position of a corresponding strip groove. The multiple strip grooves are connected to the corresponding clearance gaps. Each curved shaping block has an arc-shaped structure adapted to the main rib of the curved arc.

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