A kind of long screw pressure filling pile reinforcement cage segmented butt welding deformation prevention positioning device

Abstract

The application provides a long spiral pressure filling pile steel reinforcement cage segmented butt joint welding anti-deformation positioning device, which comprises a traveling driving mechanism, a supporting chassis, a steel reinforcement cage supporting assembly arranged on the supporting chassis, a center ring frame, a plurality of adjustable spoke assemblies and a plurality of welding anti-deformation positioning mechanisms. The long spiral pressure filling pile steel reinforcement cage segmented butt joint welding anti-deformation positioning device solves the problems of poor positioning stability, insufficient welding thermal deformation suppression effect and difficult guarantee of overall precision after welding in the process of steel reinforcement cage segmented mispositioned welding due to the lack of adjustable spoke structure for accurately adjusting the circumferential station position in the long spiral pressure filling pile steel reinforcement cage segmented welding tool.

Description

Technical Field

[0001] This invention belongs to the field of steel cage welding positioning technology, and in particular relates to a welding anti-deformation positioning device for segmented docking of long spiral pressure grouting pile steel cages. Background Technology

[0002] Long spiral drilled cast-in-place piles are an improvement upon traditional long spiral drilled cast-in-place piles. During construction, a long spiral drilling rig is typically used to drill to the designed depth. Concrete is then pumped to the bottom of the hole through the drill rod core tube. Simultaneously, the drill bit is raised to the pile top elevation. The reinforcing cage is then inserted into the plain concrete pile body using its own weight or specialized vibration equipment, thus forming a reinforced concrete cast-in-place pile. Early construction techniques typically involved lowering the reinforcing cage after drilling and then pouring concrete. Improvements have gradually led to a method of first pumping concrete and then lowering the reinforcing cage. This technique effectively overcomes problems such as pile breakage, necking, hole collapse, and slag inclusion that are common in traditional underwater concrete casting construction. It offers advantages such as better pile quality, higher construction efficiency, and wider applicability, and therefore has been widely used in long spiral drilled cast-in-place pile construction.

[0003] In the construction of long spiral cast-in-place piles, the reinforcing cage is typically characterized by its large length, high overall weight, and limitations in on-site transportation and hoisting. To facilitate processing, transportation, and lowering, the reinforcing cage is usually fabricated in sections and welded together on-site. To avoid uneven local stress and heat accumulation caused by welds concentrated on the same cross-section, the corresponding main reinforcement bars of the front and rear sections of the reinforcing cage are usually connected by staggered lap joints. However, in actual construction, because the reinforcing cage is a circumferentially distributed component, the relative positions of the welding positions of each group of main reinforcement bars to the center of the circle, the clamping state of the front and rear areas of the lap joint, and the state of thermal deformation during welding all differ. If only simple support, manual alignment, and local clamping are used for segmented welding, problems such as unstable positioning of the lap joint, local swaying of the main reinforcement bars, uneven stress in the front and rear areas of the welding zone, diffusion of welding heat deformation, and insufficient overall accuracy after welding can easily occur. Because the welding fixtures for segmented reinforcement cages of long spiral press-grouted piles in related technologies lack adjustable spoke structures for precise adjustment of the circumferential work position, lack partitioned symmetrical clamping structures for synchronous clamping of the front and rear areas of the lap welding zone, and lack cross-joint bridging clamping structures for forming bridging clamping of the front and rear areas of the welding avoidance section and enabling controlled attitude adjustment of the clamping section during the pressing process, the positioning stability during the segmented misalignment welding of the reinforcement cage is poor, the effect of suppressing welding thermal deformation is insufficient, and the overall accuracy after welding is difficult to guarantee. Summary of the Invention

[0004] In view of this, the present invention aims to at least partially solve one of the related technical problems.

[0005] To achieve the above objectives, the technical solution of the present invention is implemented as follows:

[0006] A welding anti-deformation positioning device for segmented docking of long spiral pressure grouting pile steel cage includes a traveling drive mechanism, a support base frame, a steel cage support assembly set on the support base frame, a central ring frame, multiple sets of adjustable spoke assemblies, and multiple sets of welding anti-deformation positioning mechanisms.

[0007] The steel cage support assembly is used to support the front section steel cage and the rear section steel cage respectively. The central ring frame is located inside the segmented welding area of ​​the front section steel cage and the rear section steel cage. The output end of the traveling drive mechanism is connected to the central ring frame and is used to drive the central ring frame to move along the axial direction of the steel cage.

[0008] Multiple sets of the adjustable spoke assemblies are arranged at intervals along the circumference of the central ring frame and can be adjusted radially. Multiple sets of welding anti-deformation positioning mechanisms are respectively arranged at the outer ends of the multiple sets of adjustable spoke assemblies.

[0009] Each set of welding anti-deformation positioning mechanisms includes a support mounting plate, a staggered lap positioning mechanism, two sets of clamping and pressing mechanisms, and a cross-joint bridging and pressing mechanism. The support mounting plate is set on the outer end of the corresponding adjustable spoke assembly. The staggered lap positioning mechanism is set on the support mounting plate and includes two positioning seats that are spaced back and forth along the axial direction of the steel cage. The two positioning seats jointly support and define the lap area of ​​the corresponding main bars of the front section steel cage and the rear section steel cage to form a staggered lap welding area.

[0010] The two sets of clamping and pressing mechanisms are located on the front and rear sides of the misaligned lap welding area, respectively. Each set of clamping and pressing mechanisms includes a bracket, a pressure shoe, a clamping drive component, and two elastic swing limiting components. The clamping drive component is mounted on the bracket, and its output end is rotatably connected to the middle of the pressure shoe. The two elastic swing limiting components are respectively connected between the bracket and the two sides of the pressure shoe and slide in cooperation with the pressure shoe, so that the pressure shoe can adjust its posture and stably fit the surface of the main reinforcement during the clamping process.

[0011] The cross-joint bridging and holding mechanism is located above the misaligned lap welding area and includes a portal cable tray, two sets of bridge foot holding assemblies located on the front and rear sides of the welding avoidance part, and a holding drive assembly. The portal cable tray spans above the misaligned lap welding area and has a welding avoidance part corresponding to the misaligned lap welding area. The two sets of bridge foot holding assemblies respectively form bridging and holding on the front and rear areas of the misaligned lap welding area. The holding drive assembly is connected to the portal cable tray and is used to drive the portal cable tray to move relative to the support mounting plate.

[0012] Furthermore, the support mounting plate is fixed to the outer end of the adjustable spoke assembly, and two second reinforcing ribs are symmetrically provided at the connection point with the adjustable spoke assembly;

[0013] The two positioning seats are disposed on the support mounting plate and are respectively provided with arc-shaped support grooves that are adapted to the shape of the main reinforcement to form staggered lap support for the main reinforcement.

[0014] Furthermore, each set of clamping and pressing mechanisms includes a portal frame, an arc-shaped pressing shoe, a clamping cylinder, two fixing plates, and multiple sets of pressing components;

[0015] The portal frame is disposed on the upper surface of the support mounting plate, the staggered overlapping positioning mechanism is disposed on the inner side of the portal frame, and the arc-shaped pressure shoe is disposed on the upper side of the portal frame;

[0016] The cylinder body of the clamping cylinder is fixed to the middle of the portal frame, and the piston rod of the clamping cylinder is connected to the push rod through a ball joint connection structure. The push rod is located in the middle of the upper end face of the arc-shaped pressure shoe.

[0017] Two fixing plates are symmetrically arranged on the front and rear ends of the top of the portal frame, and each set of pressing components is respectively arranged on both sides of the inner wall of the arc-shaped pressing shoe to form rolling pressing on the main rib when the arc-shaped pressing shoe is pressed down.

[0018] Furthermore, each of the elastic swing limiting components includes a telescopic rod structure and a compression spring sleeved on the outside of the telescopic rod structure. The top of the telescopic rod structure is connected to the corresponding fixed plate, and the bottom is provided with a protruding structure.

[0019] The arc-shaped pressure shoe is provided with an arc-shaped hole that slides with the protruding structure, and the top of the inner wall of the arc-shaped pressure shoe is provided with a thickened pad for accommodating the arc-shaped hole and improving the stress strength.

[0020] Each of the pressing components includes a pressing seat and a pressing roller disposed on the pressing seat. The pressing roller is disposed on the inner wall of the arc-shaped pressing shoe and is used to roll and engage with the surface of the main rib.

[0021] Furthermore, the cross-joint bridging and holding mechanism includes a welding pad, a portal cable tray, multiple sets of bridge foot holding components, two sets of pre-tightening components, and multiple sets of holding drive components. The welding pad is disposed at the bottom of the misaligned lap welding area and is detachably connected to the support mounting plate. The portal cable tray spans above the welding pad and has the welding avoidance part in the middle.

[0022] Multiple sets of the bridge foot holding components are respectively disposed on the front and rear sides of the welding avoidance part to form a bridging holding for the front and rear areas of the misaligned lap welding area;

[0023] The two sets of pre-tightening components are symmetrically arranged on both sides of the gantry cable tray for pre-tightening and limiting the gantry cable tray;

[0024] Multiple sets of the pressure-holding drive components are disposed between the gantry cable tray and the support mounting plate, for driving the gantry cable tray to move relative to the support mounting plate.

[0025] Furthermore, each of the bridge foot holding components includes two bridge foot holding rods and a fixing seat arranged on the left and right sides respectively. The fixing seat is provided with a slot, and the bridge foot holding rod is hinged to the slot through a torsion spring. The lower surface is provided with an arc-shaped holding surface that is adapted to the surface of the main reinforcement.

[0026] Each of the pressing drive components includes a second electric push rod and a first limiting nut. The second electric push rod is disposed on the lower end face of the support mounting plate, and its telescopic rod passes through the support mounting plate, the welding pad, and the gantry cable tray. The first limiting nut is disposed on the top of the telescopic rod.

[0027] Each pretensioning assembly includes a slide rod, a pretensioning spring, and a second limiting nut. The top of the slide rod is connected to the side of the gantry cable tray via a threaded sleeve, and the bottom is provided with the second limiting nut, which passes through the welding pad and the support mounting plate. The pretensioning spring is sleeved on the outside of the slide rod.

[0028] Furthermore, each adjustable spoke assembly includes an outer guide member, an inner telescopic load-bearing member, a first electric push rod, a guide limiting member, and a position feedback member. The outer guide member is fixed to the outer wall of the central ring frame. The inner telescopic load-bearing member is sleeved inside the outer guide member and connected to the welding anti-deformation positioning mechanism. The first electric push rod is disposed inside the outer guide member and connected to the inner telescopic load-bearing member, and is used to drive the inner telescopic load-bearing member to extend or retract radially.

[0029] The guide limiting member is disposed between the outer guide member and the inner telescopic load-bearing member to limit the non-radial swing of the inner telescopic load-bearing member;

[0030] The position feedback component is disposed on the adjustable spoke assembly and is used to obtain the radial displacement information of the inner telescopic load-bearing component so that the two sets of welded anti-deformation positioning mechanisms located in the circumferential mirror position can achieve synchronous adjustment and position correction.

[0031] The outer guide member is provided with multiple first reinforcing ribs at the connection between it and the central ring frame.

[0032] Furthermore, the central ring frame includes a drive ring, a guide ring, and a housing. The inner wall of the drive ring is provided with a threaded structure that cooperates with the travel drive mechanism, and the front and rear ends of the drive ring are provided with limiting portions.

[0033] The guide ring is formed by splicing two semi-circular shells, and the two semi-circular shells are connected by bolts at adjacent positions, and a first sliding groove is provided in the middle of the outer wall;

[0034] The outer shell is fitted over the guide ring, and the inner wall of the outer shell is provided with a second groove that is directly opposite to the first groove. The front and rear ends of the outer shell are connected to the limiting part by a plurality of screws.

[0035] Furthermore, the travel drive mechanism includes a drive screw, two guide rails and a stepper motor, the output end of the stepper motor is connected to the drive screw, and the drive screw is threadedly engaged with the drive ring;

[0036] The two guide rails are symmetrically arranged and respectively accommodated in the guide space formed by the first slide groove and the second slide groove, and slide in cooperation with the central ring frame to guide and limit the axial movement of the central ring frame.

[0037] Compared with existing technologies, the welding anti-deformation positioning device for segmented butt welding of long spiral pressure grouting pile reinforcement cages described in this invention has the following advantages:

[0038] 1. By employing two sets of clamping and pressing mechanisms at the front and rear, in conjunction with the cross-seam bridging and pressing mechanism located above, welding operation space can be maintained in the middle of the welding clearance section while forming a composite constraint state of lower clamping and upper bridging for the areas before and after the misaligned lap welding zone. This ensures that the lapped main reinforcement is in a stable constrained state before welding, reducing sway caused by local suspension, misalignment, or unilateral pressing. Furthermore, it continuously suppresses warping and diffusion deformation in the areas before and after the lap during welding heat input, thus significantly improving welding positioning stability and overall post-weld geometric accuracy. In addition, the arc-shaped pressure shoe, through the coordinated cooperation of the ball-head connection structure, elastic sway-limiting component, and arc-shaped hole, can perform controlled posture adjustment during pressing, ensuring the pressure shoe stably conforms to the surface of the main reinforcement. This avoids the problems of uneven pressure, jamming, or excessive local force that occur with ordinary rigid pressure heads during pressing, thereby further improving the reliability of the clamping process and the uniformity of force during welding.

[0039] 2. By setting multiple sets of adjustable spoke assemblies on the outer circumference of the central ring frame, and with the cooperation of the first electric push rod, guide limiter, and position feedback device, each set of welding anti-deformation positioning mechanisms can be precisely extended and retracted radially, and the workstations located in the circumferential mirror position can be synchronously corrected. This not only improves the alignment accuracy between different welding workstations and the misaligned lap welding area of ​​the main reinforcement, but also ensures the consistency of the layout of the circumferential mirror workstations, reducing the cumulative error caused by manual adjustment. Combined with the control of the travel drive mechanism to move the central ring frame along the axial direction of the reinforcement cage, multiple workstations can be quickly and accurately transferred as a whole between different welding positions, thereby improving tooling adaptability and work efficiency. Furthermore, the entire welding positioning and anti-deformation control process is always completed under a unified central reference, which helps ensure the overall accuracy and stability of the reinforcement cage after segmented welding. Attached Figure Description

[0040] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0041] Figure 1 This is a schematic diagram of the overall structure of a welding anti-deformation positioning device for segmented butt welding of a long spiral pressure grouting pile reinforcement cage, as described in an embodiment of the present invention.

[0042] Figure 2 This is a schematic diagram of the combined structure of the central ring frame, adjustable spoke assembly, and support mounting plate described in an embodiment of the present invention;

[0043] Figure 3 This is a schematic diagram of the welding anti-deformation positioning mechanism according to an embodiment of the present invention;

[0044] Figure 4 This is a schematic diagram of the clamping and pressing mechanism structure according to an embodiment of the present invention;

[0045] Figure 5 This is a schematic diagram of the ball joint connection structure according to an embodiment of the present invention;

[0046] Figure 6 This is a schematic diagram of the bridge foot holding assembly structure according to an embodiment of the present invention;

[0047] Figure 7 This is a schematic diagram of the adjustable spoke assembly structure according to an embodiment of the present invention;

[0048] Figure 8 This is a schematic diagram of the central ring frame structure according to an embodiment of the present invention;

[0049] Figure 9 This is a schematic diagram of the guide ring structure according to an embodiment of the present invention.

[0050] Explanation of reference numerals in the attached figures:

[0051] 100. Central ring frame; 110. Drive ring; 120. Outer shell; 130. Second slide groove; 140. First slide groove; 200. Adjustable spoke assembly; 210. Outer guide member; 220. First reinforcing rib; 230. Second reinforcing rib; 300. Clamping and pressing mechanism; 311. Clamping cylinder; 312. Fixing plate; 313. Elastic swing limiting assembly; 314. Positioning seat; 315. Arc-shaped pressure shoe; 316. Arc-shaped hole; 321. Piston rod; 322. Ball joint connection structure; 330. Pressing assembly; 400. Cross-slot bridging pressing mechanism; 410. Portal bridge; 420. Pre-tightening assembly; 430. Pressing drive assembly; 440. Bridge foot pressing assembly; 450. Welding pad; 500. Support mounting plate. Detailed Implementation

[0052] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0053] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0054] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0055] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0056] Combination Figures 1 to 9As shown in the figure, this embodiment provides a welding anti-deformation positioning device for segmented connection of reinforcing cages in long spiral grouting piles. The long spiral grouting pile construction scenario described herein specifically refers to the construction scenario where a reinforcing cage is implanted after long spiral drilling and concrete grouting to form the pile. In the construction process of long spiral drilled grouting piles, the reinforcing cage is usually implanted into the pile body after the concrete grouting is completed. Therefore, after the segmented welding of the reinforcing cage, it is necessary not only to meet the local connection strength requirements, but also to ensure the overall roundness, axial stability, and consistency of the segmented connection areas, so as to avoid affecting the overall lowering quality of the reinforcing cage due to local welding deformation during subsequent hoisting, repositioning, and implantation. In this embodiment, the traveling drive mechanism, the central ring frame 100, multiple sets of adjustable spoke assemblies 200, and multiple sets of welding anti-deformation positioning mechanisms are arranged around the center reference of the reinforcing cage. This enables synchronous adjustment and stable clamping of different positions around the circumference during the segmented welding of the reinforcing cage. Therefore, this device is not only suitable for the staggered lap welding of the main reinforcement bars in the front and rear segments, but also helps to ensure the overall geometric accuracy and subsequent implantation stability of the welded reinforcing cage in the long spiral drilled grouting pile construction scenario.

[0057] This device is used during the on-site segmented assembly of long spiral grouting pile reinforcement cages. It performs staggered lap joint positioning, zoned clamping, and cross-joint bridging of the corresponding main reinforcement bars in the front and rear sections of the reinforcement cage to ensure the stability of the welding area before and after weld formation, while also considering the overall roundness, axial stability, and consistency of the segmented connection areas of the reinforcement cage after welding. The device generally includes a traveling drive mechanism, a support base frame, reinforcement cage support components mounted on the support base frame, a central ring frame 100, multiple sets of adjustable spoke assemblies 200, and multiple sets of welding anti-deformation positioning mechanisms. These welding anti-deformation positioning mechanisms are distributed around the central reference of the reinforcement cage. The multiple sets of adjustable spoke assemblies 200 are used to radially move each welding anti-deformation positioning mechanism to the corresponding main reinforcement bar position. The traveling drive mechanism drives the central ring frame 100 to move axially along the reinforcement cage, enabling the multiple sets of welding anti-deformation positioning mechanisms to perform overall rotation corresponding to different segmented welding areas.

[0058] The support base can be a rectangular frame structure formed by welding steel sections. The support base extends along the axial direction of the reinforcing cage and has sufficient overall rigidity and load-bearing capacity to withstand all the loads of the front and rear reinforcing cages during the welding and positioning process. Preferably, the support base includes a main beam extending front and rear, a transverse connecting beam connecting the front and rear main beams, and adjustable legs or support base plates set below the main beams. Multiple installation positions can be set at intervals on the main beams for installing the reinforcing cage support components and the travel drive mechanism. The reinforcing cage support assembly can be formed by combining front and rear distributed support seats, roller assemblies, arc-shaped support blocks, lateral limiting components, and height adjusting components. The front and rear sections of the reinforcing cage rest on their respective support seats. The roller assemblies and arc-shaped support blocks provide rolling or surface contact support to the outer periphery of the reinforcing cage. The height adjusting components correct for height differences, and the lateral limiting components restrict lateral displacement of the reinforcing cage. Preferably, the support seats are spaced apart along the axial direction of the reinforcing cage. The roller assemblies and arc-shaped support blocks can be replaced or their height adjusted according to the diameter of the reinforcing cage to accommodate the support requirements of reinforcing cages of different specifications of long spiral pressure grouting piles. The lateral limiting components can limit the final stopping position of the reinforcing cage after circumferential rolling, thus ensuring that the front and rear sections of the reinforcing cage are in a repeatable initial posture before entering the effective range of the welding anti-deformation positioning mechanism. By coordinating the support frame and the rebar cage support assembly, the front and rear rebar cages can have good overall support and initial alignment conditions before welding, providing a stable benchmark for subsequent staggered lap joint positioning, clamping, and welding deformation prevention control. Preferably, when supporting the front and rear rebar cages, the rebar cage support assembly can also take into account the shape maintenance requirements of the rebar cages before continued hoisting and implantation after welding, ensuring that the two rebar cages are in a relatively stable coaxial and stressed state before entering the effective range of the welding deformation prevention positioning mechanism. With this setting, the welding deformation prevention positioning mechanism, driven by multiple sets of adjustable spoke assemblies 200, can establish a relatively consistent initial geometric benchmark when positioning the lap welding areas of each set of main reinforcement bars, thereby reducing the position adjustment error caused by unstable early support or axial deviation, and improving the positioning consistency between circumferential mirror positions.

[0059] The output end of the travel drive mechanism is connected to the central ring frame 100, which is used to drive the central ring frame 100 to move axially along the reinforcing cage. Specifically, the travel drive mechanism includes a drive screw, two guide rails, and a stepper motor. The output end of the stepper motor is connected to the drive screw, which is threaded into the central ring frame 100. The two guide rails are symmetrically arranged and slide in contact with the central ring frame 100 to guide and limit the axial movement of the central ring frame 100. When the stepper motor drives the drive screw to rotate, it can drive the central ring frame 100 to move forward or backward smoothly along the axis of the reinforcing cage, thereby moving the multiple sets of adjustable spoke assemblies 200 and the multiple sets of welding anti-deformation positioning mechanisms installed on the outer periphery of the central ring frame 100 to the target segmented welding area. The two guide rails form a double-sided guiding engagement with the central ring frame 100, which can reduce the possibility of the central ring frame 100 swaying, tilting, or jamming during long-stroke movement, and improve the stability and repeatability of the overall movement.

[0060] The central ring frame 100 is located inside the segmented welding area of ​​the front and rear reinforcing cages, serving as the mounting base and motion reference for multiple adjustable spoke assemblies 200. The central ring frame 100 includes a drive ring 110, a guide ring, and an outer shell 120. The inner wall of the drive ring 110 has a threaded structure that mates with the drive screw, and both the front and rear ends of the drive ring 110 have limiting portions. The guide ring is formed by splicing two semi-circular shells, which are connected adjacently by bolts for easy assembly and disassembly. A first groove 140 is provided in the middle of the outer wall of each of the two semi-circular shells. The outer shell 120 is fitted over the guide ring. The inner wall of the outer shell 120 has a second groove 130 corresponding to the first groove 140. The front and rear ends of the outer shell 120 are connected to the limiting portions of the drive ring 110 by multiple screws, thus forming a stable coaxial assembly structure of the drive ring 110, guide ring, and outer shell 120. The two guide rails are respectively housed in the guide space formed by the first slide groove 140 and the second slide groove 130, and slide in cooperation with the central ring frame 100 to provide axial linear guidance when the drive screw drives the central ring frame 100 to move.

[0061] Multiple sets of adjustable spoke assemblies 200 are spaced apart around the circumference of the central ring frame 100 and can be adjusted radially. Multiple sets of welding anti-deformation positioning mechanisms are respectively set at the outer ends of the multiple sets of adjustable spoke assemblies 200 to correspond one-to-one with the misaligned lap welding areas of the corresponding main ribs. Each set of adjustable spoke assemblies 200 includes an outer guide member 210, an inner telescopic load-bearing member, a first electric push rod, a guide limit member, and a position feedback member. The outer guide member 210 is fixed to the outer wall of the central ring frame 100, preferably a square tube or a rectangular guide sleeve. The inner telescopic bearing member is sleeved inside the outer guide member 210 and connected to the welding anti-deformation positioning mechanism. The first electric push rod is set inside the outer guide member 210 and connected to the inner telescopic bearing member, and is used to drive the inner telescopic bearing member to extend or retract radially. The guide limit member is set between the outer guide member 210 and the inner telescopic bearing member, and is used to limit the non-radial swing of the inner telescopic bearing member. The position feedback member is set on the adjustable spoke assembly 200, and is used to obtain the radial displacement information of the inner telescopic bearing member, so that the two sets of welding anti-deformation positioning mechanisms located in the circumferential mirror position can achieve synchronous adjustment and position correction. Multiple first reinforcing ribs 220 are provided at the connection between the outer guide member 210 and the central ring frame 100 to improve the connection stiffness between the spoke root and the central ring frame 100, and to prevent the adjustable spoke assembly 200 from undergoing local deformation due to the bearing of the welding anti-deformation positioning mechanism and the clamping and pressing reaction force when it is extended. Furthermore, two second reinforcing ribs 230 are symmetrically provided at the connection between the outer end of the inner telescopic load-bearing member and the support mounting plate 500 to improve the load-bearing capacity and bending resistance of the connection part.

[0062] Each welding anti-deformation positioning mechanism includes a support mounting plate 500, a staggered lap positioning mechanism, two sets of clamping and pressing mechanisms 300, and a cross-joint bridging and pressing mechanism 400. The support mounting plate 500 is fixed to the outer end of the corresponding adjustable spoke assembly 200, serving as a local support foundation and installation foundation for this workstation. The middle of the support mounting plate 500 corresponds to the staggered lap welding area. The staggered lap positioning mechanism is set on the support mounting plate 500 and includes two positioning seats 314 spaced back and forth along the axial direction of the reinforcing cage. The two positioning seats 314 jointly support and define the lap area of ​​the corresponding main bars of the front and rear sections of the reinforcing cage to form a staggered lap welding area. The two positioning seats 314 are respectively provided with arc-shaped support grooves adapted to the shape of the main bars to support and limit them after the lapped main bars are placed in place, so that the corresponding main bars form a staggered lap welding area of ​​predetermined length and relative position. In one embodiment, the two positioning seats 314 can be fixed on the support mounting plate 500, or a fine-tuning structure can be provided on one side to accommodate the main reinforcement laps with different diameters or different lap lengths.

[0063] Two sets of clamping and pressing mechanisms 300 are located on the front and rear sides of the staggered lap welding area, respectively, to form zoned synchronous clamping of the front and rear areas of the lap area before and during welding. Each set of clamping and pressing mechanisms 300 includes a portal frame, an arc-shaped pressing shoe 315, a clamping cylinder 311, two fixing plates 312, and multiple sets of pressing components 330. The portal frame is set on the upper end face of the support mounting plate 500, the staggered lap positioning mechanism is set on the inner side of the portal frame, and the arc-shaped pressing shoe 315 is set above the portal frame and corresponds to the lap area of ​​the main reinforcement. The cylinder body of the clamping cylinder 311 is fixed in the middle of the portal frame, and the piston rod 321 of the clamping cylinder 311 is connected to the push rod through the ball joint connection structure 322. The push rod is set in the middle of the upper end face of the arc-shaped pressing shoe 315, so that the arc-shaped pressing shoe 315 can swing at a small angle around the ball joint connection structure 322 during the pressing process. Two fixed plates 312 are symmetrically arranged on the front and rear ends of the top of the portal frame. Each fixed plate 312 has a corresponding elastic sway-limiting component 313 below it. Each elastic sway-limiting component 313 includes a telescopic rod structure and a compression spring sleeved on the outside of the telescopic rod structure. The top of the telescopic rod structure is connected to the corresponding fixed plate 312, and the bottom has a raised structure. An arc-shaped pressure shoe 315 has an arc-shaped hole 316 that slides with the raised structure. The top of the inner wall of the arc-shaped pressure shoe 315 has a thickened pad to accommodate the arc-shaped hole 316 and improve its stress resistance. Through the cooperation of the ball joint connection structure 322, the elastic sway-limiting component 313, and the arc-shaped hole 316, the arc-shaped pressure shoe 315 can adjust its limited angle posture according to the actual contact state of the main rib surface during pressing. Simultaneously constrained by the two elastic sway-limiting components 313, it achieves adaptive fitting while ensuring stable pressing of the pressure shoe, avoiding swaying or uneven local stress caused by single-point pressing.

[0064] Each set of clamping components 330 includes a clamping seat and clamping rollers disposed on the clamping seat. The clamping rollers are disposed on both sides of the inner wall of the arc-shaped clamping shoe 315 for rolling contact with the surface of the main reinforcement. When the clamping cylinder 311 is activated, the arc-shaped clamping shoe 315 is pressed vertically downward under the joint constraint of the ball joint connection structure 322 and the two elastic swing limiting components 313. The clamping rollers first contact the surface of the overlapping main reinforcement and gradually form a stable clamping in the rolling contact state. Since the clamping rollers can roll relative to the surface of the main reinforcement, the frictional resistance and local scratches during the clamping process are reduced, and the stability of the two sets of clamping and clamping mechanisms 300 when simultaneously clamping the front and rear overlapping areas is improved.

[0065] A cross-joint bridging and holding mechanism 400 is positioned above the staggered lap welding area. It provides a welding clearance portion in the middle of the lap welding area while simultaneously bridging and holding the areas before and after the welding zone to further suppress welding thermal deformation. The cross-joint bridging and holding mechanism 400 includes a welding pad 450, a portal cable tray 410, multiple sets of bridge foot holding assemblies, two sets of pre-tightening assemblies 420, and multiple sets of holding drive assemblies 430. The welding pad 450 is positioned at the bottom of the staggered lap welding area and detachably connected to the support mounting plate 500. It serves to absorb localized reaction forces below the welding area and provide a support base for the cable tray holding. The portal cable tray 410 spans above the welding pad 450 and has a welding clearance portion in the middle, corresponding to the middle of the staggered lap welding area, to allow welding tools to enter and perform welding. Multiple sets of bridge foot clamping assemblies are respectively installed on the front and rear sides of the welding clearance section to form bridging clamping for the front and rear areas of the misaligned lap welding zone. Each set of bridge foot clamping assemblies includes two bridge foot clamping rods arranged on the left and right sides and a fixing seat. The fixing seat has a slot, and the bridge foot clamping rod is hinged to the slot through a torsion spring. The lower surface has an arc-shaped clamping surface adapted to the surface of the main reinforcement. Through the elastic action of the torsion spring, the bridge foot clamping rod can swing slightly around the fixing seat during the clamping process and always keep in contact with the surface of the main reinforcement. Thus, the bridging clamping is not concentrated on a single rigid point, but can form a clamping state with a certain degree of compliance between the front and rear areas.

[0066] Two sets of pre-tensioning components 420 are symmetrically arranged on both sides of the gantry cable tray 410 for pre-tensioning and limiting the gantry cable tray 410. Each set of pre-tensioning components 420 includes a slide rod, a pre-tensioning spring, and a second limiting nut. The top of the slide rod is connected to the side of the gantry cable tray 410 through a threaded sleeve, and the bottom is provided with a second limiting nut, which passes through the welding pad 450 and the support mounting plate 500. The pre-tensioning spring is sleeved on the outside of the slide rod. Through the elastic action of the pre-tensioning spring, the gantry cable tray 410 can form a stable downward pressure under the drive of the pressing drive component 430. At the same time, it has a certain buffering and rebounding ability when the local force changes, so as to avoid the cable tray pressing rigidity being too large and affecting the surface adhesion of the main reinforcement. Multiple sets of pressing drive assemblies 430 are disposed between the gantry cable tray 410 and the support mounting plate 500 to drive the gantry cable tray 410 to move relative to the support mounting plate 500. Each set of pressing drive assemblies 430 includes a second electric push rod and a first limiting nut. The second electric push rod is disposed on the lower end face of the support mounting plate 500, and its telescopic rod passes through the support mounting plate 500, the welding pad 450, and the gantry cable tray 410. The first limiting nut is disposed on the top of the telescopic rod. When the second electric push rod is activated, it can drive the gantry cable tray 410 to rise or fall as a whole. When the gantry cable tray 410 is pressed downward, the multiple sets of bridge foot pressing assemblies press against the main rib areas on the front and rear sides of the weld avoidance part, thereby forming a bridging pressing constraint on the front and rear areas of the lap welding area without obstructing the central welding area.

[0067] In this embodiment, although the support base and the rebar cage support assembly can adopt conventional structures, to ensure sufficient disclosure of this embodiment, preferably, the support base is constructed as an integral rigid frame consisting of front-to-back extended main beams and transverse connecting beams. Adjustable legs or support plates are provided below the main beams to adapt to the elevation differences of the construction site. The rebar cage support assembly includes support seats, roller assemblies, and lateral limiting components corresponding to the front and rear rebar cages, respectively. The roller assemblies are preferably arranged in pairs so that the rebar cage can roll smoothly and achieve circumferential alignment when adjusted before welding. The lateral limiting components are preferably located on both sides of the roller assemblies to limit the lateral displacement of the rebar cage. Through the cooperation of the support base and the rebar cage support assembly, the front and rear rebar cages can have good overall support and initial alignment conditions before welding, thereby enabling the central ring frame 100, multiple sets of adjustable spoke assemblies 200, and multiple sets of welding anti-deformation positioning mechanisms to complete precise positioning and welding anti-deformation control under a stable reference.

[0068] In this embodiment, a control module may also be provided. The control module may be a programmable controller, an industrial controller, or other control unit with sequential control and position signal processing functions. The control module is electrically connected to the stepper motor in the travel drive mechanism, the first electric push rod in each adjustable spoke assembly 200, the second electric push rod in each cross-slot bridging and pressing mechanism 400, and the position feedback device. When the clamping and pressing mechanism 300 adopts a clamping cylinder 311 controlled by an electromagnetic valve, the control module may also be electrically connected to the corresponding electromagnetic valve to control the extension and retraction of the clamping cylinder 311. Through the above connection, the control module can sequentially control the axial movement of the central ring frame 100, the radial extension and retraction of each adjustable spoke assembly 200, the clamping and releasing of the clamping and pressing mechanism 300, and the pressing and returning of the cross-seam bridging and pressing mechanism 400 according to the preset program. It also receives displacement information from the position feedback component and synchronously corrects the two sets of welding anti-deformation positioning mechanisms located in the circumferential mirror position. This allows each electric module to cooperate in sequence under a unified control logic, ensuring that the positioning, clamping, bridging and pressing, and releasing processes of the misaligned lap welding area have good timing consistency and control stability.

[0069] The working method of this embodiment

[0070] Step 1: Place the front and rear steel cages on the steel cage support assembly on the support base frame. Use the roller assembly, support base and lateral limiting device to complete the initial alignment of the two steel cages, so that the two steel cages maintain a predetermined height and are basically coaxial in the segmented welding area.

[0071] Step 2: Start the travel drive mechanism to drive the central ring frame 100 to move along the axial direction of the steel cage to the corresponding segment welding area. Then control multiple sets of adjustable spoke assemblies 200 to extend and retract radially to make multiple sets of welding anti-deformation positioning mechanisms correspond one-to-one with the misaligned lap welding areas of the corresponding main bars. The position feedback device is used to synchronously correct the positions of the two sets of welding anti-deformation positioning mechanisms located in the circumferential mirror position.

[0072] Step 3: Place the corresponding main reinforcement bars into the two positioning seats 314 of the staggered lap joint positioning mechanism, so that the corresponding main reinforcement bars form a predetermined staggered lap joint welding area, and place the staggered lap joint welding area in the middle of the support mounting plate 500.

[0073] Step four: Activate the two sets of clamping and pressing mechanisms 300 located on the front and rear sides of the misaligned lap welding area, so that the clamping cylinder 311 drives the arc-shaped pressure shoe 315 to press down. With the cooperation of the ball head connection structure 322 and the two elastic swing limiting components 313, the arc-shaped pressure shoe 315 adjusts its posture and stably fits the surface of the main rib, thereby forming a zoned synchronous clamping on the front and rear sides of the misaligned lap welding area.

[0074] Step 5: Drive the multiple sets of pressing drive components 430 of the cross-joint bridging pressing mechanism 400 to move the gantry cable tray 410 relative to the support mounting plate 500, and press the multiple sets of bridge foot pressing components located on the front and rear sides of the welding avoidance part against the front and rear areas of the misaligned lap welding area, so as to form cross-joint bridging pressing on the misaligned lap welding area while keeping the welding avoidance part open.

[0075] Step 6: Under the combined condition of zoned synchronous clamping and cross-joint bridging pressure holding, welding is carried out on the misaligned lap welding area located in the corresponding area of ​​the welding avoidance part, so that the main reinforcement is completed in segmented connection.

[0076] Step 7: After welding is completed, first release the bridging pressure of the cross-joint bridging pressure mechanism 400, then release the clamping state of the two sets of clamping pressure mechanisms 300, and then control the multiple sets of adjustable spoke assemblies 200 to retract and drive the central ring frame 100 to move out of the current segment welding area, thus completing the welding positioning operation of the rebar cage segment connection.

[0077] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A welding anti-deformation positioning device for segmented butt welding of reinforcing cages in long spiral pressure grouting piles, characterized in that: It includes a travel drive mechanism, a support base frame, a steel cage support assembly mounted on the support base frame, a central ring frame (100), multiple sets of adjustable spoke assemblies (200), and multiple sets of welded anti-deformation positioning mechanisms; The steel cage support assembly is used to support the front section steel cage and the rear section steel cage respectively. The central ring frame (100) is located inside the segmented welding area of ​​the front section steel cage and the rear section steel cage. The output end of the traveling drive mechanism is connected to the central ring frame (100) and is used to drive the central ring frame (100) to move along the axial direction of the steel cage. Multiple sets of the adjustable spoke assemblies (200) are arranged at intervals along the circumference of the central ring frame (100) and can be adjusted radially. Multiple sets of welding anti-deformation positioning mechanisms are respectively arranged at the outer ends of the multiple sets of adjustable spoke assemblies (200). Each set of welding anti-deformation positioning mechanisms includes a support mounting plate (500), a staggered lap positioning mechanism, two sets of clamping and pressing mechanisms (300) and a cross-joint bridging and pressing mechanism (400). The support mounting plate (500) is disposed at the outer end of the corresponding adjustable spoke assembly (200). The staggered lap positioning mechanism is disposed on the support mounting plate (500) and includes two positioning seats (314) spaced back and forth along the axial direction of the steel cage. The two positioning seats (314) jointly support and define the lap area of ​​the corresponding main bars of the front section steel cage and the rear section steel cage to form a staggered lap welding area. The two sets of clamping and pressing mechanisms (300) are located on the front and rear sides of the misaligned lap welding area, respectively. Each set of clamping and pressing mechanisms (300) includes a bracket, a pressure shoe, a clamping drive component and two elastic swing limiting components (313). The clamping drive component is mounted on the bracket, and its output end is rotatably connected to the middle of the pressure shoe. The two elastic swing limiting components (313) are respectively connected between the bracket and the two sides of the pressure shoe and slide in cooperation with the pressure shoe, so that the pressure shoe can adjust its posture and stably fit the surface of the main reinforcement during the clamping process. The cross-joint bridging and holding mechanism (400) is located above the misaligned lap welding area and includes a portal cable tray (410), two sets of bridge foot holding assemblies located on the front and rear sides of the welding avoidance part, and a holding drive assembly (430). The portal cable tray (410) spans above the misaligned lap welding area and has a welding avoidance part corresponding to the misaligned lap welding area. The two sets of bridge foot holding assemblies respectively form bridging and holding on the front and rear areas of the misaligned lap welding area. The holding drive assembly (430) is connected to the portal cable tray (410) and is used to drive the portal cable tray (410) to move relative to the support mounting plate (500).

2. The welding anti-deformation positioning device for segmented butt welding of long spiral pressure grouting pile reinforcement cages according to claim 1, characterized in that: The support mounting plate (500) is fixed to the outer end of the adjustable spoke assembly (200), and two second reinforcing ribs (230) are symmetrically provided at the connection with the adjustable spoke assembly (200); The two positioning seats (314) are disposed on the support mounting plate (500) and are respectively provided with arc-shaped support grooves that are adapted to the shape of the main reinforcement to form staggered lap support for the main reinforcement.

3. The welding anti-deformation positioning device for segmented butt welding of long spiral pressure grouting pile reinforcement cages according to claim 1 or 2, characterized in that: Each clamping and pressing mechanism (300) includes a gantry bracket, an arc-shaped pressing shoe (315), a clamping cylinder (311), two fixing plates (312), and multiple sets of pressing components (330); The portal frame is disposed on the upper end face of the support mounting plate (500), the staggered overlapping positioning mechanism is disposed on the inner side of the portal frame, and the arc-shaped pressure shoe (315) is disposed above the portal frame; The cylinder body of the clamping cylinder (311) is fixed in the middle of the portal frame. The piston rod (321) of the clamping cylinder (311) is connected to the push rod through the ball joint connection structure (322). The push rod is located in the middle of the upper end face of the arc-shaped pressure shoe (315). Two fixing plates (312) are symmetrically arranged on the front and rear ends of the top of the portal frame. Each set of pressing components (330) is respectively arranged on both sides of the inner wall of the arc-shaped pressing shoe (315) to form rolling pressing on the main rib when the arc-shaped pressing shoe (315) is pressed down.

4. The welding anti-deformation positioning device for segmented butt welding of long spiral pressure grouting pile reinforcement cages according to claim 3, characterized in that: Each of the elastic limiter components (313) includes a telescopic rod structure and a compression spring sleeved on the outside of the telescopic rod structure. The top of the telescopic rod structure is connected to the corresponding fixing plate (312), and the bottom is provided with a protruding structure. The arc-shaped pressure shoe (315) is provided with an arc-shaped hole (316) that slides with the protrusion structure, and the top of the inner wall of the arc-shaped pressure shoe (315) is provided with a thickened pad for accommodating the arc-shaped hole (316) and improving the stress strength. Each of the pressing components (330) includes a pressing seat and a pressing roller disposed on the pressing seat. The pressing roller is disposed on the inner wall of the arc-shaped pressing shoe (315) for rolling engagement with the surface of the main reinforcement.

5. The welding anti-deformation positioning device for segmented butt welding of long spiral pressure grouting pile reinforcement cages according to claim 1, characterized in that: The cross-joint bridging and holding mechanism (400) includes a welding pad (450), a portal cable tray (410), multiple sets of bridge foot holding assemblies, two sets of pre-tightening assemblies (420), and multiple sets of holding drive assemblies (430). The welding pad (450) is disposed at the bottom of the misaligned lap welding area and is detachably connected to the support mounting plate (500). The portal cable tray (410) spans above the welding pad (450) and has the welding clearance part in the middle. Multiple sets of the bridge foot holding components are respectively disposed on the front and rear sides of the welding avoidance part to form a bridging holding for the front and rear areas of the misaligned lap welding area; Two sets of pre-tightening components (420) are symmetrically arranged on both sides of the gantry cable tray (410) for pre-tightening and limiting the gantry cable tray (410); Multiple sets of the pressure-holding drive components (430) are disposed between the gantry cable tray (410) and the support mounting plate (500) for driving the gantry cable tray (410) to move relative to the support mounting plate (500).

6. The welding anti-deformation positioning device for segmented butt welding of long spiral pressure grouting pile reinforcement cages according to claim 5, characterized in that: Each bridge foot holding assembly includes two bridge foot holding rods and a fixing seat arranged on the left and right sides respectively. The fixing seat is provided with a slot, and the bridge foot holding rod is hinged to the slot through a torsion spring. The lower surface is provided with an arc-shaped holding surface that matches the surface of the main reinforcement. Each of the pressing drive assemblies (430) includes a second electric push rod and a first limiting nut. The second electric push rod is disposed on the lower end face of the support mounting plate (500), and its telescopic rod passes through the support mounting plate (500), the welding pad (450) and the gantry cable tray (410). The first limiting nut is disposed on the top of the telescopic rod. Each pretensioning assembly (420) includes a slide rod, a pretensioning spring, and a second limiting nut. The top of the slide rod is connected to the side of the gantry cable tray (410) via a threaded sleeve, and the bottom is provided with the second limiting nut, which passes through the welding pad (450) and the support mounting plate (500). The pretensioning spring is sleeved on the outside of the slide rod.

7. The welding anti-deformation positioning device for segmented butt welding of long spiral pressure grouting pile reinforcement cages according to claim 1, characterized in that: Each adjustable spoke assembly (200) includes an outer guide member (210), an inner telescopic load-bearing member, a first electric push rod, a guide limit member, and a position feedback member. The outer guide member (210) is fixed to the outer wall of the central ring frame (100). The inner telescopic load-bearing member is sleeved inside the outer guide member (210) and connected to the welding anti-deformation positioning mechanism. The first electric push rod is disposed inside the outer guide member (210) and connected to the inner telescopic load-bearing member, and is used to drive the inner telescopic load-bearing member to extend or retract radially. The guide limiting member is disposed between the outer guide member (210) and the inner telescopic load-bearing member to limit the non-radial swing of the inner telescopic load-bearing member; The position feedback component is disposed on the adjustable spoke assembly (200) and is used to obtain the radial displacement information of the inner telescopic load-bearing component so that the two sets of welded anti-deformation positioning mechanisms located in the circumferential mirror position can achieve synchronous adjustment and position correction. The outer guide member (210) is provided with a plurality of first reinforcing ribs (220) at the connection between it and the central ring frame (100).

8. The welding anti-deformation positioning device for segmented butt welding of long spiral pressure grouting pile reinforcement cages according to claim 1, characterized in that: The central ring frame (100) includes a drive ring (110), a guide ring and a housing (120). The inner wall of the drive ring (110) is provided with a threaded structure that cooperates with the travel drive mechanism. The front and rear ends of the drive ring (110) are provided with limiting parts. The guide ring is formed by splicing two semi-circular shells, and the two semi-circular shells are connected by bolts at adjacent positions, and a first sliding groove (140) is provided in the middle of the outer wall; The outer shell (120) is sleeved on the outside of the guide ring. The inner wall of the outer shell (120) is provided with a second slide groove (130) that is directly opposite to the first slide groove (140). The front and rear ends of the outer shell (120) are connected to the limiting part by a plurality of screws.

9. The welding anti-deformation positioning device for segmented butt welding of reinforcing cages in long spiral pressure grouting piles according to claim 8, characterized in that: The driving mechanism includes a drive screw, two guide rails and a stepper motor. The output end of the stepper motor is connected to the drive screw, and the drive screw is threadedly engaged with the drive ring (110). The two guide rails are symmetrically arranged and respectively housed in the guide space formed by the first slide groove (140) and the second slide groove (130), and slide in cooperation with the central ring frame (100) to guide and limit the axial movement of the central ring frame (100).

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