Large-span steel truss lifting embedded rod precision control device and control method

Abstract

The application provides a large-span steel truss lifting embedded repair rod precision control device and control method, and relates to the technical field of steel truss construction auxiliary positioning. The device comprises a node fixing clamp, a distance adjustment compensation assembly, a limiting support assembly and a anti-twist guide assembly. The distance adjustment compensation assembly drives the two side node fixing clamps to move synchronously closer or farther apart through a bidirectional screw rod and a middle adjustment sleeve, so as to compensate for the spacing deviation between the existing steel truss nodes. The limiting support assembly limits the deflection during the distance adjustment process and provides middle support through a sliding limiting rod, a sliding limiting sleeve and a bracket. The anti-twist guide assembly controls the inclination angle of the embedded repair rod through a rotating seat, an arc-shaped support top block, a worm gear, a worm, a motor, an arc-shaped groove, a limiting bolt and a scale ring, and limits the rotation of the embedded repair rod through a limiting column, a limiting reinforcement plate and a limiting reinforcement groove. The device can improve the spacing compensation precision, the guide stability and the anti-twist effect during the high-altitude installation of the embedded repair rod.

Description

Technical Field

[0001] This invention relates to the field of auxiliary positioning technology for steel truss construction, and in particular to a precision control device and method for lifting and inserting members of large-span steel trusses. Background Technology

[0002] Large-span steel truss structures are commonly used in large factories, stadiums, stations, convention centers, and other building projects spanning significant spaces. During construction, to minimize the workload of assembling components at height, some truss units are typically assembled on the ground into a single unit or segmented structure. The steel truss is then lifted to the design elevation using methods such as overall lifting, synchronous lifting, or segmented lifting. After the steel truss is in place, some lower chords, web members, diagonal braces, or short members between nodes need to be fitted and installed between existing steel truss nodes on both sides to complete the closure of the structural load-bearing system.

[0003] In actual construction, the installation of patch members typically requires simultaneous adherence to multiple precision requirements, including node spacing, member elevation, end hole positions, gusset plate fit, and tilt angle. However, large-span steel trusses are susceptible to deflection due to their own weight, synchronous errors at lifting points, deformation of temporary supports, gusset plate processing errors, and changes in the on-site installation environment during the lifting process. This can cause deviations between the actual spacing between the two nodes to be patched and the design dimensions. Although these deviations are usually small, they are sufficient to make it difficult to insert the patch member smoothly, or to result in one end fitting snugly while the other end has an excessively large gap. Summary of the Invention

[0004] The purpose of this invention is to provide a precision control device and method for lifting and patching members of large-span steel trusses, which can solve the problems of difficulty in accurately compensating for node spacing deviation, easy swaying during the adjustment process, lack of stable support for patching members, and easy self-rotation when inclined patching members are introduced during the installation process of existing large-span steel trusses after lifting and patching members.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a precision control device for lifting and inserting members of a large-span steel truss, including a node fixing clamp, and further including a distance adjustment compensation component, a limit support component, and an anti-torsion guide component.

[0006] The distance adjustment compensation assembly is located between two node fixing clamps and includes a bidirectional screw connecting the two node fixing clamps, and a central adjusting sleeve located on the outer side of the middle of the bidirectional screw. The central adjusting sleeve is used to drive the bidirectional screw to rotate, so that the distance between the two node fixing clamps can be adjusted for compensation.

[0007] In a preferred embodiment, the pitch compensation assembly further includes a fixed frame, a fixed seat, and a rotary connecting sleeve. The fixed frame is fixedly connected to one side of the node fixing clamp, the fixed seat is fixedly connected to the side of the fixed frame near the node fixing clamp, and the fixed seat is used to connect with the node fixing clamp. The rotary connecting sleeve is fixedly connected to one side of the fixed seat, and the rotary connecting sleeve is threadedly engaged with the end of the bidirectional screw. With the above structure, the rotation of the bidirectional screw can be transmitted to the node fixing clamp via the rotary connecting sleeve, the fixed seat, and the fixed frame, causing the node fixing clamps on both sides to move closer or further apart in a controllable manner.

[0008] In a preferred embodiment, two fixing frames are provided, one at each end of a bidirectional screw. Each end of the bidirectional screw has threaded sections with opposite directions of rotation. Two rotating connecting sleeves are threadedly connected to their corresponding threaded sections. The central adjusting sleeve can drive the two fixing frames and the node fixing clamp to move synchronously closer or further away via the bidirectional screw, thereby compensating for the spacing deviation between the two existing steel truss nodes.

[0009] In a preferred embodiment, the distance adjustment compensation assembly also includes a fixing angle steel, which is disposed on the side of the fixing frame near the end of the node fixing clamp. The fixing angle steel is used to fix the node fixing clamp in place. The fixing angle steel increases the connection stability between the fixing frame and the node fixing clamp, making the force transmission during the distance adjustment process more reliable.

[0010] In a preferred embodiment, the limiting support assembly is disposed below the adjustment compensation assembly and includes a sliding limiting rod, a sliding limiting sleeve, and a bracket. The sliding limiting sleeve is fixedly connected to the lower part of the fixed frame, and the sliding limiting rod slides through the inner side of the sliding limiting sleeve and is arranged along the length direction of the bidirectional screw. The sliding limiting rod is used to limit the sway of the adjustment compensation assembly during the adjustment process. The bracket is disposed below the sliding limiting rod to provide central support for the sliding limiting sleeve and can also provide auxiliary support for the sliding limiting rod or the insert rod as needed during construction.

[0011] In a preferred embodiment, the anti-torsion guide assembly is disposed on one side of the node fixing clamp and includes a base, a rotating seat, and an arc-shaped support top block. The rotating seat is rotatably connected to the base, and the arc-shaped support top block is disposed on the rotating seat. The arc-shaped support top block is used to support and guide the inclined insert rod.

[0012] In a preferred embodiment, the anti-torsion guide assembly further includes a worm gear, a worm, a motor, an arc-shaped groove, a limiting bolt, and a graduated ring. The worm gear is fixedly connected to one side of the arc-shaped support top block, the worm is rotatably connected to the inner side of the bottom end of the rotating seat and meshes with the worm gear, the motor is mounted on one side of the rotating seat, and the output end of the motor is connected to the worm. The arc-shaped groove is formed on the inner sides of both ends of the arc-shaped support top block, the limiting bolt passes through the arc-shaped groove and is connected to the rotating seat, and the graduated ring is set on the outer side of the arc-shaped groove to indicate the rotation angle of the rotating seat.

[0013] In a preferred embodiment, the anti-torsion guide assembly further includes a limiting post, a limiting reinforcement plate, and a limiting reinforcement groove. The limiting post is fixedly connected to both sides of the rotating seat to limit the extreme rotational position of the rotating seat and increase its connection rigidity. The limiting reinforcement plate is fixedly connected to one side of the node fixing clamp, and the limiting reinforcement groove is formed on the limiting reinforcement plate to limit the rod or rod end structure during the introduction of the inclined insert rod, thereby reducing the rotation of the insert rod.

[0014] Compared with the prior art, the advantages and positive effects of the present invention are as follows: This invention, through the cooperation of node fixing clamps, bidirectional screws, central adjusting sleeves, fixing frames, fixing seats, and rotating connecting sleeves, can use existing steel truss nodes on both sides as adjustment benchmarks to mechanically and synchronously compensate for node spacing deviations. Through the cooperation of sliding limit sleeves, sliding limit rods, and brackets, it can limit swaying during the adjustment process and improve the stability of the central support. Through the cooperation of the base, rotating seat, arc-shaped support top block, worm gear, worm, motor, arc-shaped groove, limit bolts, scale rings, limit columns, limit reinforcement plates, and limit reinforcement grooves, it can control the introduction angle of the inclined insert members and limit their rotation, thereby improving the installation accuracy and construction safety of the insert members. Attached Figure Description

[0015] Figure 1 A front view structural schematic diagram of a precision control device and control method for lifting and inserting members of a large-span steel truss provided by the present invention; Figure 2 A schematic diagram of the central adjusting sleeve and fixing frame in a precision control device and method for lifting and inserting members of a large-span steel truss provided by the present invention; Figure 3 A schematic diagram of the fixed seat and rotating connecting sleeve in a precision control device and method for lifting and inserting members of a large-span steel truss provided by the present invention; Figure 4 A schematic diagram of the fixed angle steel and sliding limit sleeve in a precision control device and method for lifting and inserting members of a large-span steel truss provided by the present invention; Figure 5This is a schematic diagram of the rotating seat and the arc-shaped support top block in the precision control device and method for lifting and inserting members of a large-span steel truss provided by the present invention.

[0016] Legend: 1. Node fixing clamp; 2. Bidirectional screw; 201. Central adjusting sleeve; 202. Fixing frame; 203. Fixing seat; 204. Rotary connecting sleeve; 205. Fixing angle steel; 206. Sliding limit sleeve; 207. Sliding limit rod; 208. Bracket; 3. Base; 301. Rotating seat; 302. Arc-shaped support top block; 303. Worm gear; 304. Worm; 305. Motor; 306. Arc-shaped groove; 307. Limiting bolt; 308. Scale ring; 309. Limiting post; 310. Limiting reinforcement plate; 311. Limiting reinforcement groove. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example 1

[0018] Please see Figures 1 to 4 This embodiment provides a precision control device for lifting and inserting members of a large-span steel truss, the specific idea of ​​which is as follows: A precision control device for lifting and patching members of a large-span steel truss includes a node fixing clamp 1. The device also includes a distance adjustment compensation component and a limit support component.

[0019] The device includes two node fixing clips 1, which are installed at the existing steel truss nodes on both sides. The node fixing clips 1 can clamp onto the outside of the node plate, node short rod, or steel components near the node, allowing the device to use the existing steel truss nodes as the installation base. The node fixing clips 1 reduce the impact of re-drilling or welding temporary parts on the existing steel truss nodes and provide a stable load-bearing point for the subsequent spacing compensation components.

[0020] It is important to note that the node fixing clamp 1 can adopt a clamping, gripping, or contact-limiting structure according to the actual structure of the existing steel truss node. Its inner side can fit against the outer surface of the node plate, node short rod, or nearby members, and its outer side is fixed by fasteners. The clamping direction of the node fixing clamp 1 is preferably matched with the direction of the line connecting the two nodes to be fitted, so that the tensile and compressive forces transmitted by the bidirectional screw 2 can act on the node fixing clamp 1 through the fixing frame 202 and the fixing seat 203, and then be transmitted to the existing steel truss node by the node fixing clamp 1. When using this installation method, it is not necessary to re-drill holes or weld temporary ear plates on the existing steel truss node, which can reduce the impact on the original structure, while ensuring that the spacing compensation component has a stable load-bearing foundation when performing node spacing compensation.

[0021] As some examples, in this embodiment, the pitch compensation assembly includes a bidirectional screw 2 and a central adjusting sleeve 201.

[0022] The bidirectional screw 2 is arranged along the direction between the two node fixing clamps 1, and is connected between the two node fixing clamps 1. A central adjusting sleeve 201 is located on the outer side of the middle of the bidirectional screw 2. The central adjusting sleeve 201 can be configured as a sleeve structure with a wrench face, handwheel, or anti-slip outer periphery, facilitating rotation operation by construction personnel in high-altitude construction environments. When the construction personnel rotate the central adjusting sleeve 201, the central adjusting sleeve 201 drives the bidirectional screw 2 to rotate, thereby providing adjustment power for the gap compensation between the two node fixing clamps 1.

[0023] Meanwhile, the fixed frame 202 is fixedly connected to one side of the node fixing clamp 1, and the fixed seat 203 is fixedly connected to the side of the fixed frame 202 near the node fixing clamp 1. The fixed seat 203 is used to connect with the node fixing clamp 1. The rotary connecting sleeve 204 is fixedly connected to one side of the fixed seat 203 and is close to the end connection area of ​​the bidirectional screw 2. The rotary connecting sleeve 204 is threadedly engaged with the end of the bidirectional screw 2, so that the rotation of the bidirectional screw 2 can be transmitted to the fixed seat 203 and the fixed frame 202 through the rotary connecting sleeve 204, and then the fixed frame 202 drives the corresponding node fixing clamp 1 to move closer or further away.

[0024] To further clarify, the fixed base 203 and the rotary connecting sleeve 204 are not separate, independent end components; both are located on the side of the fixed frame 202 near the node fixing clamp 1. The fixed base 203 serves to form a stable connection between the fixed frame 202 and the node fixing clamp 1, and to bear the axial adjustment force from the bidirectional screw 2. The rotary connecting sleeve 204 is located on one side of the fixed base 203, near the threaded section at the end of the bidirectional screw 2, and the axis of the rotary connecting sleeve 204 is aligned with the axis of the bidirectional screw 2. When the middle adjusting sleeve 201 drives the bidirectional screw 2 to rotate, a threaded pushing action is generated between the bidirectional screw 2 and the rotary connecting sleeve 204. This force is transmitted sequentially through the rotary connecting sleeve 204, the fixed base 203, and the fixed frame 202 to the node fixing clamp 1, thereby completing the synchronous adjustment of the node fixing clamps 1 on both sides.

[0025] In addition, two fixing frames 202 are provided, located at both ends of the bidirectional screw 2. The two ends of the bidirectional screw 2 are respectively provided with threaded sections with opposite directions of rotation, and two rotating connecting sleeves 204 are threadedly connected to the corresponding threaded sections. Because the two threaded sections rotate in opposite directions, when the middle adjusting sleeve 201 drives the bidirectional screw 2 to rotate in one direction, the two fixing frames 202 can move closer together synchronously; when the middle adjusting sleeve 201 drives the bidirectional screw 2 to rotate in opposite directions, the two fixing frames 202 can move further apart synchronously, thereby achieving compensation adjustment for the spacing deviation between the two existing steel truss nodes.

[0026] It is important to note that the two fixed frames 202 are located near the node fixing clips 1 on both sides, forming a symmetrical adjustment relationship with the bidirectional screw 2. This structure avoids excessive force on one side of the node due to pushing and pulling on only one side, ensuring that the two node fixing clips 1 move relatively synchronously during adjustment. For node spacing deviations of a few millimeters to tens of millimeters commonly encountered in actual construction, construction personnel can gradually compensate by rotating the central adjusting sleeve 201 at small angles in stages, avoiding excessive adjustment at one time that could cause stress concentration at the end of the node plate or the inserted rod.

[0027] To further explain, the fixing angle steel 205 is located on the side of the fixing frame 202 near the end of the node fixing clamp 1, and is used to fix the node fixing clamp 1 in place. The fixing angle steel 205 can be an L-shaped angle steel structure, with one side cooperating with the fixing frame 202 or the fixing seat 203, and the other side near the end of the node fixing clamp 1. By using the fixing angle steel 205, the connection rigidity between the fixing frame 202, the fixing seat 203 and the node fixing clamp 1 can be improved, making it less likely for the node fixing clamp 1 to loosen or shift relative to the fixing frame 202 during the adjustment compensation process.

[0028] In addition, the main function of the fixing angle steel 205 is to enhance the fixed connection between the fixing frame 202 and the node fixing clamp 1. However, since the fixing angle steel 205 is located on the side of the fixing frame 202 near the end of the node fixing clamp 1, its edge or side is close to the end of the insert member or the edge of the node plate in the installed state. Therefore, it can also play an auxiliary role in limiting and aligning during construction. Specifically, when the insert member is hoisted between two existing nodes, the fixing angle steel 205 can serve as an end abutment or edge reference structure, making it difficult for the end of the insert member to shift significantly relative to the node plate. When the node fixing clamp 1 moves slightly closer or further away from the fixing frame 202, the fixing angle steel 205 can also improve the overall rigidity of the end structure and reduce loosening in the connection area.

[0029] Meanwhile, a limiting support assembly is positioned below the pitch adjustment compensation assembly. This assembly includes a sliding limiting sleeve 206, a sliding limiting rod 207, and a bracket 208. The sliding limiting sleeve 206 is fixedly connected to the lower part of the fixed frame 202. The sliding limiting rod 207 slides through the inner side of the sliding limiting sleeve 206 and is arranged along the length of the bidirectional screw 2. The sliding limiting rod 207 is approximately parallel to the bidirectional screw 2. The bidirectional screw 2 primarily provides the pitch adjustment driving force, while the sliding limiting rod 207 primarily guides the pitch adjustment process linearly and limits sway.

[0030] In addition, two sliding limit sleeves 206 are provided, each connected to the lower part of one of the two fixed frames 202. A sliding limit rod 207 passes through the two sliding limit sleeves 206 sequentially. When the two fixed frames 202 move closer or further apart synchronously under the action of the bidirectional screw 2, the two sliding limit sleeves 206 slide along the sliding limit rod 207. The sliding limit rod 207 can restrict the upward, downward, or lateral swaying of the two fixed frames 202 during the adjustment process, ensuring good parallelism between the two node fixing clamps 1 during the adjustment process.

[0031] To further explain, bracket 208 is positioned below sliding limit rod 207, providing mid-section support for sliding limit sleeve 206. The lower end of bracket 208 can be fixed to a construction platform, temporary support surface, or other stable foundation, while the upper end is positioned near sliding limit rod 207 and sliding limit sleeve 206. This support from below by bracket 208 reduces mid-section deflection when the span of the adjustment compensation component is long, improving the stability of the connection between the bidirectional screw 2, sliding limit rod 207, and sliding limit sleeve 206. Depending on on-site construction needs, bracket 208 can also assist in supporting the insert rods, preventing significant swaying during hoisting and alignment.

[0032] It is important to note that the bracket 208 provides central support for the sliding limit sleeve 206 by directly supporting the sliding limit rod 207. Since the sliding limit rod 207 passes sequentially through two sliding limit sleeves 206, the sliding limit sleeves 206 need to slide smoothly along the sliding limit rod 207 during the adjustment process. When the span of the sliding limit rod 207 is large or the weight of the insert rod is significant, the middle of the sliding limit rod 207 is prone to sagging, thus affecting the coaxial sliding of the sliding limit sleeves 206. With the bracket 208 positioned below the sliding limit rod 207, its upper end can support the middle of the sliding limit rod 207 or the area near the sliding limit sleeves 206, keeping the sliding limit rod 207 in a relatively straight position. This indirectly provides central support for the sliding limit sleeves 206, ensuring the parallel stability of the adjustment compensation assembly. Example 2

[0033] Please see Figure 1 and Figure 5 This embodiment provides a precision control device for lifting and inserting members of a large-span steel truss, the specific idea of ​​which is as follows: A precision control device for lifting and patching members of a large-span steel truss includes a node fixing clamp 1, and the device also includes an anti-torsion guide component.

[0034] The anti-torsion guide component is located on one side of the node fixing clamp 1. The anti-torsion guide component includes a base 3, a rotating seat 301, and an arc-shaped support top block 302. The base 3 serves as the installation foundation for the anti-torsion guide component. The base 3 can be positioned near the node fixing clamp 1 and forms a stable connection with the node fixing clamp 1, the construction platform, or a temporary support structure. The rotating seat 301 is rotatably connected to the base 3, and the arc-shaped support top block 302 is mounted on the rotating seat 301. The arc-shaped support top block 302 supports and guides the inclined insert member.

[0035] Meanwhile, the arc-shaped support top block 302 can form an arc-shaped support surface that matches the shape of the member. When the inclined insertion member is hoisted to the vicinity of the existing node, the arc-shaped support top block 302 can support the local outer wall of the member or the area near the end of the member. As the angle of the arc-shaped support top block 302 is adjusted, the inclined insertion member can be gradually introduced into the node connection area according to the preset direction, thereby reducing the member swing and end misalignment caused by manual prying.

[0036] Furthermore, the worm gear 303 is fixedly connected to one side of the arc-shaped support block 302, and the worm 304 is rotatably connected to the inner side of the bottom end of the rotating seat 301 and meshes with the worm gear 303. The motor 305 is mounted on one side of the rotating seat 301, and its output end is connected to the worm 304. After the motor 305 starts, it drives the worm 304 to rotate. The worm 304, through meshing with the worm gear 303, drives the arc-shaped support block 302 to adjust its angle, enabling the arc-shaped support block 302 to support and adjust the guide angle of the inclined insert member at a slower speed and with a larger force ratio.

[0037] To further explain, after the worm gear 303 is fixed to one side of the arc-shaped support block 302, the arc-shaped support block 302 is no longer just a simple support block, but an induction support component that can be adjusted in a controlled angle under the drive of the worm gear 303. After the motor 305 outputs torque, the torque is first transmitted to the worm 304, and the worm 304 then drives the worm gear 303 to rotate through the meshing relationship. The worm gear 303 drives the arc-shaped support block 302 to change the support angle. Since the worm 304 is rotatably connected to the inner side of the bottom of the rotating seat 301, the rotating seat 301 can provide the worm 304 with an installation reference and load-bearing space, making it less likely for the arc-shaped support block 302 to wobble during adjustment. The meshing between the worm gear 303 and the worm 304 also has a deceleration and a certain self-locking effect, which can prevent the inclined insert rod from pushing the arc-shaped support block 302 to rotate rapidly under its own weight.

[0038] It is important to note that the cooperation between the worm gear 304 and the worm wheel 303 provides good deceleration and self-locking effects. When the inclined inserting rod exerts a reverse force on the arc-shaped support block 302 under its own weight or the action of hoisting sway, the worm gear 304 and the worm wheel 303 can reduce the risk of the arc-shaped support block 302 swinging back, so that the arc-shaped support block 302 maintains a relatively stable position after being adjusted to the target angle.

[0039] To further explain, the arc-shaped groove 306 is formed on the inner sides of both ends of the arc-shaped support block 302, and the limiting bolt 307 passes through the arc-shaped groove 306 and is connected to the rotating seat 301. When the arc-shaped support block 302 is adjusted in angle, the limiting bolt 307 can move relative to it within the arc-shaped groove 306, thus limiting the range of motion of the arc-shaped support block 302. The scale ring 308 is set on the outer side of the arc-shaped groove 306 to display the rotation angle of the rotating seat 301 or the arc-shaped support block 302. Construction personnel can determine the current insertion angle based on the relative position between the limiting bolt 307 and the scale ring 308, thereby improving the controllability of the inclined insertion process.

[0040] Meanwhile, the limiting posts 309 are fixedly connected to both sides of the rotating seat 301 to limit the extreme rotational position of the rotating seat 301 and increase the connection rigidity between the rotating seat 301 and the surrounding structure. The limiting posts 309 can form a mechanical stop when the rotating seat 301 rotates to the predetermined extreme position, preventing the rotating seat 301 from rotating beyond its range and causing the arc-shaped support top block 302 to excessively push the inserting rod.

[0041] Furthermore, a limiting reinforcement plate 310 is fixedly connected to one side of the node fixing clamp 1, and a limiting reinforcement groove 311 is formed on the limiting reinforcement plate 310. The limiting reinforcement plate 310 is installed near the existing node along with the node fixing clamp 1, and the limiting reinforcement groove 311 can limit the side, end connecting plate or anti-torsion mating part of the inclined insert member. When the inclined insert member is guided into the node position under the support of the arc-shaped support top block 302, the limiting reinforcement groove 311 can restrict the member from rotating around its own axis, thereby avoiding end plate directional deviation, bolt hole misalignment or bevel direction mismatch.

[0042] It is important to note that the limiting and reinforcing groove 311 is not only used for weight reduction or obstacle avoidance, but primarily for creating an anti-torsion limiting space. For inclined insert members with end plates, the limiting and reinforcing groove 311 can accommodate the edge of the end plate or a temporary limiting part on the end plate, so that the edge of the end plate abuts against the groove wall of the limiting and reinforcing groove 311. For box-shaped or H-shaped members, the limiting and reinforcing groove 311 can cooperate with the side edge, flange edge, or temporary limiting pin of the member, so that even if the member is subjected to the swing of the sling or lateral thrust during the insertion process, it is not easy for it to rotate around its own axis. The limiting and reinforcing plate 310 is fixedly connected to one side of the node fixing clamp 1, so that the limiting and reinforcing groove 311 is fixed with the existing node as the fixing reference, thereby ensuring that the anti-torsion limiting position is consistent with the node connection direction. Example 3

[0043] Please see Figures 1 to 5 This embodiment provides a method for controlling the accuracy of lifting and patching members in large-span steel trusses, the specific idea of ​​which is as follows: A method for controlling the accuracy of lifting and patching members in a large-span steel truss employs the large-span steel truss lifting and patching member accuracy control device described in Examples 1 and 2.

[0044] Before construction, two node fixing clips 1 are installed at the existing steel truss nodes on both sides, so that the two node fixing clips 1 clamp or fix to the corresponding node plates, node short rods or steel components near the nodes. After the node fixing clips 1 are installed, they can provide a common installation reference for the pitch compensation component and the anti-torsion guide component.

[0045] Simultaneously, the bidirectional screw 2 is positioned between the two node fixing clamps 1, and the fixing frame 202, fixing seat 203, and rotating connecting sleeve 204 are connected to the corresponding node fixing clamps 1. During installation, the bidirectional screw 2 should be arranged along the length direction between the two nodes, with the central adjusting sleeve 201 located in the middle of the bidirectional screw 2, and the two fixing frames 202 located at both ends of the bidirectional screw 2. The fixing seat 203 and rotating connecting sleeve 204 are held in the end connection area near the fixing frame 202 to ensure a stable path when the adjusting force is transmitted from the bidirectional screw 2 to the node fixing clamp 1.

[0046] Furthermore, the sliding limit rod 207 is inserted into the sliding limit sleeve 206, and the sliding limit rod 207 or the insert rod is supported by the bracket 208. After the bracket 208 is arranged below the sliding limit rod 207, it can provide mid-range support for the sliding limit sleeve 206, thereby reducing the deflection of the sliding limit rod 207 when it spans a long distance. After the insert rod is hoisted between the two nodes, the bracket 208 can also provide temporary auxiliary support for the insert rod.

[0047] It is important to note that before compensating for the node spacing, the actual spacing between the existing nodes on both sides and the relative position between the end of the insert member and the node plate should be observed to determine whether to bring them closer or spread them out. Then, the construction workers rotate the central adjusting sleeve 201, which drives the bidirectional screw 2 to rotate. Because the threaded sections at both ends of the bidirectional screw 2 rotate in opposite directions, the two rotating connecting sleeves 204 can drive the two fixed frames 202 to move closer or further away simultaneously, thereby compensating for the spacing deviation between the two existing steel truss nodes. During the adjustment process, the sliding limit sleeve 206 slides along the sliding limit rod 207, which restricts the sway of the fixed frame 202, making the node spacing compensation process more stable.

[0048] To further explain, the fixed angle steel 205 is used to limit and align the ends of the insert members or node plates. The fixed angle steel 205 forms an auxiliary fixing and limiting structure on the side of the fixed frame 202 near the end of the node fixing clamp 1, so that the ends of the insert members or node plates are less likely to be significantly misaligned during the adjustment process, thus facilitating the alignment of subsequent connection holes or the fitting of end faces.

[0049] Simultaneously, when the inserting member is an inclined member, the motor 305 is started. The motor 305 drives the worm gear 304 to rotate. The worm gear 304, through the worm wheel 303, drives the arc-shaped support block 302 to adjust its support angle relative to the rotating seat 301, so that the arc-shaped support block 302 supports and guides the inclined inserting member. The angle adjustment of the arc-shaped support block 302 can change the guiding direction of the inclined inserting member, allowing the end of the member to gradually enter the node connection area.

[0050] Furthermore, the rotation angle of the rotating seat 301 or the arc-shaped support block 302 is controlled by the arc-shaped groove 306, the limiting bolt 307, and the scale ring 308. When the limiting bolt 307 moves within the arc-shaped groove 306, it can limit the adjustment range of the arc-shaped support block 302, and the scale ring 308 is used to assist in observing angle changes. The rotation of the insert rod is limited by the limiting post 309, the limiting reinforcement plate 310, and the limiting reinforcement groove 311, so that the inclined insert rod maintains relative stability in the end direction, hole direction, and bevel direction during the insertion process.

[0051] Working principle: In use, the two node fixing clips 1 are first installed at the existing steel truss nodes on both sides, so that the entire device uses the existing nodes on both sides as a common installation reference for spacing adjustment, support, and guide. After the node fixing clips 1 are clamped or fixed to the node plate, node short rod, or steel components near the node, they can provide a force-bearing end point for the bidirectional screw 2 and also provide an anti-torsion reference for the anti-torsion guide component. Since the device is installed with the existing nodes as the reference, the subsequent spacing compensation, angle guide, and end alignment of the insert rods are all carried out around the actual node position, which can avoid reference drift caused by simply relying on temporary supports or manual visual inspection.

[0052] When installing the pitch compensation assembly, the bidirectional screw 2 spans between the two node fixing clamps 1, the central adjusting sleeve 201 is located in the middle of the bidirectional screw 2, and the two fixing frames 202 are located at both ends of the bidirectional screw 2. The fixing seat 203 is fixedly connected to the side of the fixing frame 202 near the node fixing clamp 1, and the rotating connecting sleeve 204 is fixedly connected to one side of the fixing seat 203 and threadedly engages with the end of the bidirectional screw 2. The fixing seat 203 and the rotating connecting sleeve 204 are concentrated in the same end connection area, so that the threaded adjustment force can be transmitted sequentially along the bidirectional screw 2, the rotating connecting sleeve 204, the fixing seat 203, the fixing frame 202, and the node fixing clamp 1, avoiding the force transmission point dispersion that would cause twisting in the end connection area.

[0053] When the actual distance between two existing steel truss nodes is less than or greater than the distance required for the installation of the insert members, the construction personnel rotate the central adjusting sleeve 201, which drives the bidirectional screw 2 to rotate. Since the threaded sections at both ends of the bidirectional screw 2 rotate in opposite directions, the two rotating connecting sleeves 204 can generate opposite threaded pushing action along the bidirectional screw 2, thereby driving the two fixed frames 202 and the two node fixing clamps 1 to move closer or further away synchronously. In this way, the distance between the two nodes can be compensated in a small range, smoothly and repeatably through threaded transmission, avoiding the problems of uncontrollable adjustment, excessive local stress on the node plate, or excessive gap at one end when forcibly pulling together with pry bars, chain hoists, or jacks.

[0054] During the aforementioned adjustment process, the fixed angle steel 205 is located on the side of the fixed frame 202 near the end of the node fixing clamp 1. The fixed angle steel 205 strengthens the fixed connection between the fixed frame 202 and the node fixing clamp 1, making the connection area less prone to loosening during the transmission of the adjustment force. Furthermore, it forms an auxiliary limiting reference near the end of the insert member or the node plate, preventing lateral displacement of the insert member when it approaches the node connection position. Thus, the fixed angle steel 205 both contributes to the stability of the end structure connection and provides an auxiliary boundary for the alignment of the insert member's end.

[0055] The limiting and supporting assembly plays a role in preventing swaying and providing support during the distance adjustment process. The sliding limiting sleeve 206 is fixed below the fixed frame 202, and the sliding limiting rod 207 slides through the inner side of the sliding limiting sleeve 206, arranged approximately parallel to the bidirectional screw 2. When the two fixed frames 202 move closer or further away from each other with the bidirectional screw 2, the sliding limiting sleeve 206 slides along the sliding limiting rod 207. The sliding limiting rod 207 provides a straight guide for the fixed frames 202, limiting the upward tilting, downward sinking, or lateral swaying of the fixed frames 202 under force. The bracket 208, positioned below the sliding limiting rod 207, supports the middle part of the sliding limiting rod 207 or the area near the sliding limiting sleeve 206, ensuring that the sliding limiting rod 207 maintains a good straightness even with a large span. This indirectly ensures smooth sliding of the sliding limiting sleeve 206 and reduces the overall downward deflection of the distance adjustment compensation assembly.

[0056] When the insert member is horizontal or near-horizontal, the distance adjustment compensation component and the limiting support component work together to complete the node spacing compensation, end auxiliary limiting, and temporary support. After the insert member is hoisted between two nodes, the bracket 208 can provide auxiliary support for the sliding limiting rod 207 or the insert member, so that the member is not prone to significant downward deflection due to its own weight; the fixed angle steel 205 can form auxiliary alignment for the end of the insert member or the node plate; the middle adjusting sleeve 201 continues to make micro-distance adjustments through the bidirectional screw 2, so that the two ends of the insert member gradually approach the connection position of the existing node.

[0057] When the insert member is a diagonal brace, diagonal strut, or inclined member with an end plate, the anti-torsion guide component participates in the guide control. The base 3 is located on one side of the node fixing clamp 1, the rotating seat 301 is rotatably connected to the base 3, and the arc-shaped support top block 302 is located on the rotating seat 301 and used to support the inclined insert member. After the inclined insert member is hoisted to the vicinity of the node, the local outer wall, the area near the end, or the position near the end plate of the member first contacts the arc-shaped support top block 302, which then bears the local load of the member and provides guide support.

[0058] After the motor 305 starts, it drives the worm 304 to rotate. The worm 304 meshes with the worm wheel 303, which is fixedly connected to one side of the arc-shaped support block 302. Therefore, the worm 304 can adjust the angle of the arc-shaped support block 302 through the worm wheel 303. Since the worm 304 is rotatably connected to the inner side of the bottom of the rotating seat 301, the rotating seat 301 provides a stable installation position for the worm 304. Under the drive of the worm wheel 303, the arc-shaped support block 302 can adjust the support angle at a lower speed and a larger force ratio, so that the inclined inserting rod is gradually guided into the node position along the predetermined angle. The meshing of the worm wheel 303 and the worm 304 has a certain self-locking capability, which can reduce the risk of the arc-shaped support block 302 swinging back due to the counter-pushing of the rod's own weight.

[0059] When adjusting the angle of the arc-shaped support top block 302, the arc-shaped groove 306 and the limiting bolt 307 cooperate to control the adjustment range. The arc-shaped groove 306 is formed on the inner side of both ends of the arc-shaped support top block 302, and the limiting bolt 307 passes through the arc-shaped groove 306 and is connected to the rotating seat 301. When the arc-shaped support top block 302 rotates or is adjusted, the limiting bolt 307 moves relative to the arc-shaped support top block 306, and the end of the arc-shaped groove 306 restricts the arc-shaped support top block 302 from continuing to rotate excessively. The scale ring 308 is set on the outer side of the arc-shaped groove 306. Construction personnel can judge the current introduction angle according to the position of the limiting bolt 307 relative to the scale ring 308, so that the introduction process of the inclined rod has an observable and controllable angle reference.

[0060] Limiting posts 309 are fixedly connected to both sides of the rotating seat 301 to limit the extreme rotation position of the rotating seat 301 and increase the connection rigidity of the rotating seat 301. When the rotating seat 301 or the arc-shaped support top block 302 approaches the maximum allowable angle, the limiting posts 309 can form a mechanical stop to prevent the inserting rod from being excessively pushed due to continued rotation. Limiting reinforcement plate 310 is fixedly connected to one side of the node fixing clamp 1, and limiting reinforcement groove 311 is formed on the limiting reinforcement plate 310. When the inclined inserting rod is introduced, the limiting reinforcement groove 311 can cooperate with the edge of the end plate, the side edge of the rod, the flange edge, or the temporary limiting part, and limit the rod to rotate around its own axis by lateral abutment through the groove wall. In this way, even if the rod is subjected to swing or eccentric force during hoisting, the end direction, hole direction, and bevel direction of the rod can still maintain relative stability.

[0061] This invention uses node fixing clips 1 to fix the device at the existing steel truss nodes on both sides, providing a stable reference for the adjustment and insertion process, thus solving the problem of lacking a unified reference in the prior art due to temporary supports or manual prying. Through the cooperation of the bidirectional screw 2, the central adjusting sleeve 201, the fixing frame 202, the fixing seat 203, and the rotating connecting sleeve 204, the two node fixing clips 1 can move closer or further apart synchronously, achieving small-range, stable, and controllable compensation for node spacing deviation, avoiding forced insertion at one end, excessive gap at the other end, and local deformation of the node plate. The cooperation of the fixing angle steel 205, the sliding limit sleeve 206, the sliding limit rod 207, and the bracket 208 improves the adjustment process. The connection rigidity, linear guidance stability, and central support capacity reduce the deflection and sway of the adjustment compensation components and the high-altitude swaying of the insert members. Through the cooperation of the base 3, rotating seat 301, arc-shaped support top block 302, worm gear 303, worm 304, motor 305, arc-shaped groove 306, limit bolt 307, and scale ring 308, the guide angle of the inclined insert members can be controllably adjusted. Through the cooperation of the limit column 309, limit reinforcement plate 310, and limit reinforcement groove 311, the rotation of the inclined insert members can be restricted, avoiding inconsistent end plate directions, misaligned bolt holes, and mismatched bevel angles, thereby improving the accuracy, efficiency, and safety of the installation of insert members after the lifting of large-span steel trusses.

[0062] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A precision control device for lifting and inserting members of a large-span steel truss, comprising a node fixing clamp (1), characterized in that: Also includes: The distance adjustment compensation component is disposed between the two node fixing clamps (1), including a bidirectional screw (2) connected between the two node fixing clamps (1) and a middle adjusting sleeve (201) disposed on the outer side of the middle part of the bidirectional screw (2). The middle adjusting sleeve (201) is used to drive the bidirectional screw (2) to rotate so that the distance between the two node fixing clamps (1) can be compensated and adjusted. The limiting support assembly is located below the adjustment compensation assembly, including a sliding limiting rod (207) located below the bidirectional screw (2) and a bracket (208) located below the sliding limiting rod (207). The sliding limiting rod (207) is used to limit the sway of the adjustment compensation assembly during the adjustment process, and the bracket (208) is used to support the sliding limiting rod (207) or the insert rod. The anti-torsion guide assembly is located on one side of the node fixing clamp (1), including a base (3), a rotating seat (301) rotatably connected to the base (3), and an arc-shaped support top block (302) located on the rotating seat (301). The arc-shaped support top block (302) is used to support and guide the inclined insert rod.

2. The precision control device for lifting and inserting members of a large-span steel truss according to claim 1, characterized in that: The distance adjustment compensation component also includes: The fixed frame (202) is fixedly connected to one side of the node fixing clip (1); A fixing seat (203) is fixedly connected to the side of the fixing frame (202) near the node fixing clip (1), and the fixing seat (203) is used to connect with the node fixing clip (1); A rotating connecting sleeve (204) is fixedly connected to one side of the fixed base (203), and the rotating connecting sleeve (204) is threadedly engaged with the end of the bidirectional screw (2).

3. The precision control device for lifting and fitting members of a large-span steel truss according to claim 2, characterized in that: Two fixing frames (202) are provided, and the two fixing frames (202) are respectively located at both ends of the bidirectional screw (2). The two ends of the bidirectional screw (2) are respectively provided with threaded sections with opposite directions of rotation. The two rotating connecting sleeves (204) are respectively threadedly connected to the corresponding threaded sections. The middle adjusting sleeve (201) can drive the two fixing frames (202) and the node fixing clamp (1) to move closer or further away synchronously through the bidirectional screw (2).

4. The precision control device for lifting and inserting members of a large-span steel truss according to claim 2, characterized in that: The distance adjustment compensation component also includes a fixed angle steel (205), which is disposed on the side of the fixed frame (202) near the end of the node fixing clamp (1) and is used to fix the node fixing clamp (1).

5. The precision control device for lifting and inserting members of a large-span steel truss according to claim 2, characterized in that: The limiting support assembly also includes a sliding limiting sleeve (206), which is fixedly connected to the bottom of the fixed frame (202). The sliding limiting rod (207) slides through the inner side of the sliding limiting sleeve (206) and is arranged along the length direction of the bidirectional screw (2).

6. The precision control device for lifting and inserting members of a large-span steel truss according to claim 5, characterized in that: Two sliding limit sleeves (206) are provided, and the two sliding limit sleeves (206) are respectively connected to the bottom of the two fixed frames (202). The sliding limit rod (207) passes through the two sliding limit sleeves (206) in sequence. The bracket (208) is provided below the sliding limit rod (207) and is used to provide mid-section support for the sliding limit sleeve (206) by supporting the sliding limit rod (207).

7. The precision control device for lifting and fitting members of a large-span steel truss according to claim 1, characterized in that: The anti-torsion guide component also includes: The worm gear (303) is fixedly connected to one side of the arc-shaped support top block (302); The worm (304) is rotatably connected to the inner side of the bottom end of the rotating seat (301) and meshes with the worm wheel (303); A motor (305) is mounted on one side of the rotating base (301), and the output end of the motor (305) is connected to the worm (304); Arc-shaped grooves (306) are formed on the inner sides of both ends of the arc-shaped support top block (302); The limiting bolt (307) is inserted into the arc-shaped groove (306) and connected to the rotating seat (301); A scale ring (308) is disposed on the outside of the arc-shaped groove (306) to display the rotation angle of the rotating seat (301) or the arc-shaped support top block (302).

8. The precision control device for lifting and fitting members of a large-span steel truss according to claim 7, characterized in that: The anti-torsion guide assembly also includes a limiting post (309), a limiting reinforcement plate (310), and a limiting reinforcement groove (311). The limiting post (309) is fixedly connected to both sides of the rotating seat (301) to limit the extreme rotation position of the rotating seat (301) and increase its connection rigidity. The limiting reinforcement plate (310) is fixedly connected to one side of the node fixing clamp (1). The limiting reinforcement groove (311) is opened on the limiting reinforcement plate (310).

9. A method for controlling the accuracy of lifting and patching members in a large-span steel truss, characterized in that: The precision control device for lifting and inserting members of a large-span steel truss according to any one of claims 1 to 8 includes the following steps: S1. Install the two node fixing clips (1) on the existing steel truss nodes on both sides respectively; S2. Arrange the bidirectional screw (2) between the two node fixing clamps (1), and connect the fixing frame (202), the fixing seat (203) and the rotating connecting sleeve (204) to the corresponding node fixing clamp (1); S3. Insert the sliding limiting rod (207) into the sliding limiting sleeve (206), and support the sliding limiting rod (207) or the insert rod through the bracket (208); S4. Rotate the middle adjusting sleeve (201) to drive the two fixed frames (202) to move closer or further away synchronously through the bidirectional screw (2) to compensate for the spacing deviation between the two existing steel truss nodes. S5. The fixed angle steel (205) is used to limit and align the end of the insert rod or the node plate; S6. Start the motor (305), and drive the arc-shaped support top block (302) to adjust the support angle relative to the rotating seat (301) through the worm (304) and the worm wheel (303), so that the arc-shaped support top block (302) supports and guides the inclined insert rod; S7. The rotation angle of the rotating seat (301) or the arc-shaped support top block (302) is controlled by the arc groove (306), the limiting bolt (307) and the scale ring (308), and the rotation of the insert rod is restricted by the limiting post (309), the limiting reinforcement plate (310) and the limiting reinforcement groove (311).

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