A steel bar clamping device for connecting lightweight concrete wall panels

Abstract

The present invention relates to the technical field of civil engineering pile foundation steel bar connection, and specifically discloses a steel bar clamping device for connecting lightweight concrete wall panels, comprising an outer tube, an inner tube, a fixing device, a driving device and a rod insertion mechanism. The outer tube is connected to the upper section of the steel bar, and the inner tube is connected to the lower section of the steel bar. The inner tube can slide inside the outer tube. When the embedded steel bars of the upper and lower wall panels produce relative displacement, the rod insertion mechanism in the outer tube is inserted into the serrated linkage block on the fixed rod, driving it to slide, and pushing the first top plate, the second top plate and the fixed plate to move inward in turn, thereby realizing radial clamping of the embedded steel bars of the wall panels. A wavy force transmission interface is provided between the fixed structures to enhance the force transmission efficiency. The device is provided with an elastic metal sheet buffer structure, and has functions such as automatic clamping, buffering force limiting, and self-resetting. It has a compact structure and stable clamping, and is suitable for prefabricated building scenarios such as steel bar butt connection between lightweight concrete wall panels.

Description

Technical Field

[0001] The invention relates to the technical field of lightweight building component connection, in particular to a steel bar clamping device used for connecting parts of lightweight concrete wall panels. Background Art

[0002] Currently, lightweight components such as autoclaved aerated concrete (ALC), foam concrete, and composite insulation wall panels are widely used in prefabricated building construction. These walls are typically prefabricated in factories and assembled on-site to form a monolithic wall structure. To ensure the integrity and load-bearing capacity of the assembled wall, components are often connected through rebar splicing, supplemented by grouting. However, traditional rebar connection methods, such as straight threaded rebar sleeves or grouting anchors, are not only complex to install and inefficient to construct, but are also prone to loose connections and rework due to rebar misalignment. Furthermore, lightweight wall panels are characterized by their low density and weight, resulting in overall stiffness inferior to traditional cast-in-place structures, placing higher demands on the stability of the connection nodes. In particular, loose rebar connections at wall panel joints can easily lead to structural displacement, wall cracking, and even load-bearing failure. The existing technology lacks an automatic, responsive rebar clamping device specifically designed for lightweight concrete wall panels that can directly actuate the clamping mechanism based on relative displacement between components, without relying on sleeve thread tightening or grouting, to achieve a fast and secure connection. Summary of the Invention

[0003] The object of the present invention is to provide a steel bar clamping device for connecting lightweight concrete wall panels to solve the problems raised in the above background technology.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] A steel bar clamping device for connecting lightweight concrete wall panels, comprising:

[0006] An outer tube 11, with diameter-changing structures at both ends of the outer tube 11;

[0007] The inner tube 21 is slidably disposed in the inner cavity of the outer tube 11;

[0008] A driving device 4 is provided between the outer tube 11 and the inner tube 21 and is used to convert the axial relative displacement between the outer tube 11 and the inner tube 21 into a radial clamping action;

[0009] A plurality of placement grooves 22 are formed in an annular array on the outer wall of the inner tube 21 and radially penetrate the inner wall of the inner tube 21;

[0010] The fixing device 3 is installed in the placement groove 22 and includes a fixing plate 31 and a propulsive member. The propulsive member moves radially to push the fixing plate 31 inward to clamp the steel bars in the inner tube 21;

[0011] The driving device 4 includes:

[0012] A plurality of fixed rods 41 are distributed along the axial direction of the inner tube 21 and installed on the outer wall thereof;

[0013] A plurality of sawtooth linkage blocks 42 are slidably disposed on the fixed rod 41 and are respectively connected to the propulsive members, and the sawtooth linkage blocks 42 have a sawtooth groove structure 43 for plugging;

[0014] A plurality of movable rods 44 are mounted on the inner wall of the outer tube 11 in a circular array and are staggered with the fixed rods 41;

[0015] The inserting rod 45 is rotatably connected to the movable rod 44 and is inserted into the tooth groove structure of the sawtooth linkage block 42 to realize the action driving when the outer tube 11 slides relative to the inner tube 21.

[0016] Preferably, the propulsive member includes a first top plate 32 and a second top plate 33, which are radially stacked in sequence. The contact surfaces between the fixed plate 31 and the first top plate 32 are both wavy structures, and the contact surfaces between the first top plate 32 and the second top plate 33 are both wavy structures.

[0017] Preferably, the lengths of the first top plate 32 and the second top plate 33 are smaller than the length of the seating groove 22 .

[0018] Preferably, before the device is driven, the fixing plate 31 and the first top plate 32, as well as the first top plate 32 and the second top plate 33 are tightly fitted via wavy contact surfaces, and the respective wave crests are correspondingly nested with the wave troughs of adjacent components.

[0019] Preferably, the two sawtooth linkage blocks 42 on each fixed rod 41 are distributed in a mirror image, and the two sawtooth linkage blocks 42 located on the same fixed rod 41 can only move in back-to-back directions.

[0020] Preferably, the free ends of the two groups of insertion rods 45 located on the same side wall of the movable rod 44 extend toward the meshing side walls of the adjacent serrated linkage blocks 42 .

[0021] Preferably, the meshing surface of the sawtooth groove structure 43 matches the rotation direction of the insertion rod 45 .

[0022] Preferably, the first top plate 32 and the second top plate 33 are connected to the corresponding sawtooth linkage blocks 42 in a non-rigid manner.

[0023] Preferably, a slideway 5 is provided on the outer wall of the inner tube 21 at a position corresponding to the movable rod 44 .

[0024] Preferably, an elastic metal sheet is provided on the side wall of the fixing plate 31 pointing toward the interior of the inner tube 21 .

[0025] The present invention proposes a steel bar clamping device for connecting lightweight concrete wall panels, which has the following beneficial effects: the present invention provides a steel bar clamping device for connecting lightweight concrete wall panels, which can automatically trigger the clamping action when the upper and lower sections of the steel bars undergo relative displacement, and utilize the movable rod to drive the insertion rod to engage with the serrated linkage block to realize the multi-level top plate radially pressing the fixed plate layer by layer, thereby significantly enhancing the clamping force of the steel bar connection part; the device structure uses a variety of matching designs such as wavy contact surface, elastic metal sheet, self-resetting hinged insertion rod, slide guide structure, etc. to ensure smooth connection action, efficient force transmission and accurate positioning, and has the advantages of reliable clamping, sensitive response and strong adaptability, and is suitable for steel bar butt connection and structural seismic performance enhancement in lightweight wall panel structures. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the structure of the present invention;

[0027] Figure 2 This is a schematic diagram of the outer tube and inner tube structure of the present invention;

[0028] Figure 3 This is a first partial schematic diagram of the driving device of the present invention;

[0029] Figure 4 This is a second partial schematic diagram of the driving device of the present invention;

[0030] Figure 5 is a schematic diagram of the fixing device of the present invention;

[0031] Figure 6 It is a schematic diagram of the sawtooth linkage block of the present invention.

[0032] In the figure: 11, outer tube, 12, small diameter section, 21, inner tube, 22, placement groove, 3, fixing device, 31, fixing plate, 32, first top plate, 33, second top plate, 4, driving device, 41, fixed rod, 42, serrated linkage block, 43, serrated groove structure, 44, moving rod, 45, insertion rod, 5, slideway. DETAILED DESCRIPTION

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0034] See also Figures 1-6 The present invention provides a technical solution for a steel bar clamping device for connecting lightweight concrete wall panels. The detailed connection means are well known in the art. The following mainly introduces the working principle and process. The specific operation is as follows:

[0035] A steel bar clamping device for connecting lightweight concrete wall panels comprises an outer tube 11, an inner tube 21, a plurality of placement grooves 22 and a fixing device 3.

[0036] Both ends of the outer tube 11 are of a variable diameter structure, and the inner diameter of the inner cavity of the outer tube 11 is larger than the outer diameter of the inner tube 21, and an annular cavity is formed between the two, which is used to accommodate the various components of the drive device 4 and ensure its normal operation; the outer tube 11 is provided with a variable diameter structure at both ends, one end of which is a three-section variable diameter structure, which includes: a large diameter section, a variable diameter section and a small diameter section 12 in sequence, and the inner diameter of the small diameter section 12 matches the outer diameter of the pre-embedded steel bars of the wall panel, and is used to fit and connect with the outer wall of the steel bar to achieve a structural connection between the device and the pre-embedded steel bars of the upper section of the wall panel; the other end is a two-section variable diameter structure, which includes: a large diameter section and a variable diameter section in sequence, and the inner diameter of the end thereof is slightly larger than the outer diameter of the inner tube 21, which is only used to guide and limit the axial slippage of the inner tube, and is not fit and connected with the pre-embedded steel bars of the wall panel. One end of the outer tube 11 is used to connect the embedded steel bars of the upper wall panel, and the small diameter section 12 of the end matches the outer diameter of the embedded steel bars of the upper wall panel, so that it is firmly connected to the upper steel bars by tight fitting or welding, thereby realizing a reliable docking connection of the embedded steel bars in the wall panel, and improving the pull-out resistance and anti-slip ability of the pile foundation steel bar connection part. The inner tube 21 is slidably arranged in the inner cavity of the outer tube 11, and its outer diameter is smaller than the inner diameter of the outer tube 11, so that an annular cavity for the arrangement of the drive device 4 and the sliding of the components is formed therebetween. One end of the inner tube 21 is used to connect the embedded steel bars of the lower wall panel, which can be connected by welding, threaded fitting or plug-in mechanism, so that the device can achieve high-strength docking with the embedded steel bars of the upper and lower wall panels during the hoisting or construction of lightweight wall panels or prefabricated walls, ensuring the stress Continuity, a number of placement grooves 22 are evenly opened on the annular outer wall of the inner tube 21 in an annular array. The placement grooves 22 are a through structure, extending from the outer wall of the inner tube 21 to the inner wall, and completely penetrating the inner tube 21 in the radial direction, so that the placement grooves 22 can directly contact the steel bars in the tube to form a clamping channel. The placement grooves 22 are used to accommodate multi-stage fixing components to achieve radial clamping or limiting of the pre-embedded steel bars of the wall panels. The fixing device 3 is installed in the placement grooves 22 to effectively restrain and clamp the steel bars in multiple circumferential directions. The fixing device 3 uses a graded compression structure to enable it to move along the radial direction of the inner tube 21 when driven from the outside, thereby generating a step-by-step enhanced radial clamping force on the pre-embedded steel bars of the wall panels, thereby improving the pull-out resistance and anti-slip ability of the pile foundation steel bar connection parts.

[0037] The fixing device 3 includes: a fixing plate 31 slidably arranged in the placement groove 22, and its side facing the center of the inner tube 21 is a working surface, which contacts the outer wall of the embedded steel bars of the wall panel under the force state, and plays a clamping and fixing role; a propulsive component arranged on the outside of the fixing plate 31, which is used to transmit the clamping force to the fixing plate in the driving state. The advanceable component includes a first top plate 32 and a second top plate 33, which are radially stacked in sequence: the fixed plate 31 is slidably arranged in the placement groove 22, and is set as a sliding structure along the radial direction of the inner tube 21, and its contact surface facing the center side of the inner tube 21 is in contact with the outer wall of the embedded steel bars of the wall panel. Under the force state, the fixed plate 31 can move toward the direction of the embedded steel bars of the wall panel under the push of the first top plate 32 or the second top plate 33 to achieve primary clamping. The fixed plate 31 maintains the stability of the overall structure during the clamping process, and its sliding path is limited by the groove wall of the placement groove 22 to prevent excessive advancement or disengagement. The first top plate 32 is movably installed on the side wall of the fixed plate 31 facing the outside of the inner tube 21. It can slide relative to the fixed plate 31, and the contact interface between it and the fixed plate 31 It is set to a wavy structure, which is a non-planar contact surface with multiple crests and troughs. When the first top plate 32 or the second top plate 33 is pushed radially, the fixed plate 31 can be pushed radially inward through the crest-trough misalignment engagement, thereby playing a role in flexible force transmission. The second top plate 33 is movably installed on the side wall of the first top plate 32 facing the outside of the inner tube 21, and a wavy contact interface is also set between the second top plate 32, so that it can independently generate a radial force on the first top plate 32 when driven externally, forming a step-by-step force transmission structure. During the operation of the fixing device 3, the first top plate 32 and the second top plate 33 are alternately driven, and form a structural closed loop with the fixed plate 31 respectively, to ensure that the fixed plate 31 can achieve the clamping effect on the steel bars under any unilateral drive.

[0038] The driving device 4 includes: a plurality of fixed rods 41 , a sawtooth linkage block 42 , a plurality of movable rods 44 and a plurality of inserting rods 45 .

[0039] A plurality of fixed rods 41 are evenly installed on the outer wall of the inner tube 21 in an annular array. The fixed rods 41 are distributed along the circumference and extend in the axial direction. The fixed rods 41 are straight bar guides with both ends fixed to the outer wall of the inner tube 21. During use, they are used to guide the serrated linkage block 42 in a slideway manner to ensure that the linkage block can only slide in the axial direction to avoid structural offset or failure. The serrated linkage block 42 is unidirectionally slidably arranged on the fixed rod 41 to respond to the engagement action of the insertion rod 45 to produce axial sliding, and then push the connected first top plate 32 and second top plate 33, so as to realize the pushing of the fixed plate 31 and realize radial clamping. Each fixed rod 41 is provided with two serrated linkage blocks 42, which are respectively located at the upper and lower parts of the fixed rod 41 and are arranged axially symmetrically. The structural features are The mirror image design, that is, the tooth grooves are opposite in direction and in the opposite inclination direction, and can respectively form meshing with the insertion rod from above or below. Each serrated linkage block 42 is provided with serrated tooth grooves on both sides that cooperate with the insertion rod 45. The rotation direction of the insertion rod 45 cooperates with the opening inclination direction of the tooth groove, so that the insertion rod 45 can be inserted along the guide inclined surface of the tooth groove during the rotation process, thereby realizing the directional selectivity and meshing stability of the insertion action. Among them, the two serrated linkage blocks 42 on the same fixed rod 41 are respectively connected to the first top plate 32 and the second top plate 33. They are independent of each other in structure and do not interfere with each other in action. When the upper serrated linkage block 42 is driven to slide under the engagement of the insertion rod 45, only the first top plate 32 to which it is connected produces radial displacement, while the second top plate 33 The first top plate 32 remains stationary with the fixed plate 31, and the first top plate 32 uses the wave structure set between the fixed plate 31 and the first top plate 32 to make the fixed plate 31 displace and complete the clamping action by utilizing the force transmission principle of the wave crest pushing the wave trough. On the contrary, when the lower serrated linkage block 42 is driven to slide, the second top plate 33 moves, the first top plate 32 and the fixed plate 31 remain stationary, and the clamping force is generated by the wave structure between the second top plate 33 and the fixed plate 31 to achieve the same clamping effect, thereby always ensuring the stability and reliability of the clamping action without the need for simultaneous driving of both ends. The movable rods 44 are set on the inner wall of the outer tube 11, and the number and spacing of the movable rods 44 are staggered with the fixed rods 41. The plurality of movable rods 44 are installed in a circular array, and their axial direction is consistent with the inner tube 21. The movable rods 44 are arranged at intervals. 4 has a certain length in structure, and moves with the outer tube 11 when the inner tube 21 and the outer tube 11 slide relative to each other axially. A plurality of mounting hinges for the insertion rods 45 are provided on the outer wall of each movable rod 44, which are used to realize the movable connection of the insertion rods 45. The hinge structure has a rebound characteristic so that the insertion rods 45 can swing at a controllable angle around the hinge point while sliding axially. This structure cooperates with the relative displacement behavior of the outer tube 11 and the inner tube 21 to trigger the engagement action of the insertion rods 45 during the sliding process. The insertion rods 45 are the key linkage components for realizing the engagement with the sawtooth linkage block 42, and are used to control the action triggering of the sawtooth linkage block 42 during the sliding process of the outer tube 11. The insertion rods 45 are divided into four groups, and the four groups of insertion rods 45 are evenly distributed and installed on the outer wall of each movable rod 44 in a relatively symmetrical structure.The free end of the insertion rod 45 extends toward the meshing area between the fixed rods 41. During the sliding process, the insertion rod 45 can actively enter the serrated grooves on both sides of the serrated linkage block 42 to achieve insertion, and the meshing action is only formed when the structural directions match. The four groups of insertion rods 45 are centrally symmetrically arranged relative to the axis of the movable rod 44. When the inner and outer tubes 11 undergo relative movement, the insertion rod 45 at the front end of the sliding direction will automatically insert into the meshing groove of the corresponding serrated linkage block 42, while the insertion rod 45 at the rear end of the sliding direction will be disengaged from the serrations due to the mismatch in structural directions, realizing a dynamic linkage behavior of insertion at one end and release at the other end, thereby realizing one-way transmission. Each insertion rod 45 realizes a self-resetting function by being provided with an elastic return mechanism or a torsion spring hinge. When the external force is released or the sliding stops, it can automatically rebound to its original position, preparing the structural starting state for the next round of action, ensuring that the plug-in and pull-out cycles are controllable and reusable.

[0040] The lengths of the first top plate 32 and the second top plate 33 are both shorter than the lengths of the corresponding mounting grooves 22, so that the top plates have sufficient movement stroke during the driven sliding process, avoiding movement blockage or insufficient clamping stroke caused by being limited by the length of the mounting grooves 22. At the same time, a certain buffer space is reserved in the non-moving state to improve the top plate installation alignment accuracy and the wave structure interlocking effect.

[0041] The contact surface between the fixed plate 31 and the first top plate 32 is a wavy structure, and the contact surface between the first top plate 32 and the second top plate 33 is also a wavy structure. Each group of wavy structures includes multiple crests and troughs distributed along the axial direction. Adjacent components are interlocked in the manner of crests to troughs and troughs to crests. During the force-bearing process, the axial thrust can be gradually converted into radial clamping force through contact displacement, thereby improving the force transmission efficiency and enhancing the overall clamping stability of the device.

[0042] When the device is not driven, the wavy contact surfaces between the fixed plate 31 and the first top plate 32, and between the first top plate 32 and the second top plate 33 are in a tightly fitted state, and the respective wave crests are correspondingly embedded in the wave troughs of the adjacent components, forming an initial stable interlocking structure. This fitting relationship can effectively prevent the components from loosening or dislocation during transportation or lifting, and at the same time provide a stable starting position for subsequent clamping actions.

[0043] The two serrated linkage blocks 42 provided on each fixed rod 41 are distributed in a mirror-symmetrical manner in the axial direction and are respectively located at the mid-vertical line of the fixed rod 41. The two serrated linkage blocks 42 can only slide in the back direction. The two structures do not interfere with each other and have independent functions. They respectively drive the first top plate 32 or the second top plate 33 to move, forming an independently controllable dual-channel clamping mechanism.

[0044] The free ends of the two groups of insertion rods 45 located on the same side wall of the same movable rod 44 extend toward the meshing side walls of the two adjacent serrated linkage blocks 42 respectively. The insertion rods 45 match the tooth groove angle of the serrated linkage block 42 in the structural direction, and the insertion direction has directional control to ensure that the insertion rods 45 complete the insertion action only in the set direction during the sliding process of the outer tube 11, preventing reverse misinsertion or interference jamming.

[0045] The rotation direction of each insertion rod 45 is consistent with the meshing direction of the serrated structure on the side wall of its corresponding serrated linkage block 42, that is, the inclined surface of the serrated surface coincides with the rotation path direction of the insertion rod 45, so that during the insertion process, the insertion rod 45 can smoothly slide into the tooth groove to form an engagement, and automatically disengage due to the angle mismatch when sliding in the opposite direction, thereby realizing the directional selectivity of the plugging and unplugging action.

[0046] The first top plate 32 and the second top plate 33 are respectively connected to the corresponding serrated linkage block 42 by a non-rigid connection method, and the non-rigid connection method is a slide guide connection, an elastic bayonet connection or a bevel latch structure, which is used to adapt to the directional inconsistency between the axial sliding of the serrated linkage block 42 and the radial movement of the top plate, ensuring controllable thrust conversion and structural buffering stability, while avoiding structural damage or jamming. The first top plate 32 or the second top plate 33 and the corresponding serrated linkage block 42 are non-rigidly connected by a support column insertion guide structure. A support column extending in the radial direction is provided on the serrated linkage block 42, and the outer diameter of the support column is D; a circular hole is opened at the corresponding position on the inner side of the first top plate 32 or the second top plate 33, and the hole diameter is slightly larger than D, forming a clearance fit insertion relationship. When the serrated linkage block 42 is driven to slide axially, the support column can produce a slight slip in the hole and drive the top plate to move. The plug-in structure retains appropriate degrees of freedom while transmitting driving force.

[0047] On the outer wall of the inner tube 21, a slideway 5 is provided corresponding to the position of each movable rod 44. The slideway 5 is a U-shaped or groove structure extending along the axial direction of the inner tube 21, and cooperates with the slide rail structure provided at the bottom of the movable rod 44 to form a sliding guide mechanism, which is used to limit the offset angle and swing trajectory of the movable rod 44 during the sliding process, thereby improving the alignment accuracy and structural response speed of the plug-in action between the insertion rod 45 and the serrated linkage block 42. An elastic metal sheet is provided on the surface of the fixed plate 31 pointing to the inside of the inner tube 21. The metal sheet can generate auxiliary clamping force or buffering force during the action of the fixed plate 31, which is used to provide additional clamping extension at the end of the clamping action, compensate for the contact instability caused by insufficient top plate stroke, engagement error of the insertion rod 45 or deviation of the steel bar position, enhance the overall clamping performance and adaptability, and at the same time be used to generate flexible deformation in the process of gradual increase of the clamping force, absorb the impact load in the transmission process and release the reaction energy, avoid component deformation, steel bar damage or connection mechanism structural failure caused by rigid compression.

[0048] Working principle:

[0049] The present invention provides a steel bar clamping device for connecting lightweight concrete wall panels, which mainly consists of an outer tube 11, an inner tube 21, a fixing device 3 (including a fixing plate 31, a first top plate 32, and a second top plate 33), and a driving device 4 (a fixed rod 41, a serrated linkage block 42, a movable rod 44, and an insertion rod 45). The device is connected to the upper wall panel pre-embedded steel bars and the lower wall panel pre-embedded steel bars respectively through a coaxial sliding connection between the outer tube 11 and the inner tube 21 to form a structural whole. The transmission and clamping system arranged inside the device automatically responds and gradually increases the clamping force when the upper and lower steel bars undergo relative displacement, thereby achieving a stable connection between the steel bars and improving the structural pull-out resistance. During use, if the upper and lower wall panels pre-embedded steel bars are caused to move due to concrete pouring, construction settlement, structural load transfer, etc. Axial displacement occurs between the steel bars, and the outer tube 11 and the inner tube 21 then slide relative to each other. During the sliding process, the outer tube 11 drives the movable rods 44 arranged in an equidistant ring on its inner wall to move axially. Four groups of plug rods 45 distributed in a centrally symmetrical manner are provided on the outer wall of the movable rod 44. The plug rods 45 are connected to the movable rod 44 through a self-resetting hinge structure. When the sliding direction is consistent with the swinging direction of the plug rod 45, the free end of the plug rod 45 rotates inwardly and is inserted into the serrated groove of the serrated linkage block 42 on the fixed rod 41 to form a structural engagement. The engagement direction of the plug rod 45 matches the inclination direction of the sawtooth one by one to ensure that the plug rod 45 can be completed only when the sliding direction is correct. It has a one-way selective control effect. Each fixed rod 41 is provided with two serrated linkage blocks 42, which are mirror-imaged and respectively When the first top plate 32 and the second top plate 33 are connected, when the insertion rod 45 is inserted into the upper serrated linkage block 42 and drives it to slide axially, only the first top plate 32 connected by the serrated linkage block 42 is driven to advance radially, and the second top plate 33 and the fixed plate 31 remain stationary. The wavy contact surface between the top plate and the fixed plate 31 realizes force transmission by the wave crest pushing the wave trough, thereby pushing the fixed plate 31 to move toward the surface of the steel bar, generating a clamping force. When sliding in the opposite direction, another insertion rod 45 is inserted into the lower serrated linkage block 42 to drive the second top plate 33 to move, and similarly, the wave structure between it and the fixed plate 31 pushes the fixed plate 31 to clamp the embedded steel bars of the wall panel. The double top plate-fixed plate 31 structure can be driven alternately, and the clamping strength is continuously enhanced in multiple responses to form a "cross-clamping" structure. The linkage structure of "staggered advancement and layer-by-layer clamping" is adopted. During the sliding process of the fixed plate 31, one end face of the fixed plate 31 facing the inner cavity of the inner tube 21 contacts the surface of the embedded steel bar of the wall panel and is gradually pressed to achieve radial limit fixation of the steel bar. In order to prevent damage caused by rigid compression, an elastic metal sheet structure is provided between the inner side of the fixed plate 31 and the steel bar, which can deform and absorb energy at the end of clamping to provide a buffering effect. The metal sheet can not only improve the clamping fit, but also prevent the steel bar from deforming or the clamping structure from fatigue. The outer wall of the inner tube 21 is provided with a slideway 5 structure corresponding to the arrangement position of the movable rod 44, which is used in conjunction with the slider at the bottom of the movable rod 44 to ensure that the running trajectory of the 44 is controlled and the insertion rod 45 is accurately inserted during the axial sliding process of the 44, so as to avoid action failure or engagement error caused by offset. After each sliding response, the deviceThe insertion rod 45 relies on the self-reset function of the hinge to disengage the serrated linkage block 42 and return to its initial position, completing a clamping cycle. The device can be automatically triggered by repeated small relative slips between the embedded steel bars of the upper and lower wall panels, continuously generating clamping force, and has excellent adaptability and repeatability. The entire device has a compact structure, accurate movement, and reliable clamping. It has passive response, no external energy source, and is resistant to eccentricity and fatigue. It is suitable for connecting prefabricated components such as assembled lightweight concrete wall panels and composite partition panels.

[0050] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A steel bar clamping device for connecting lightweight concrete wall panels, characterized in that: include: An outer tube (11), wherein both ends of the outer tube (11) are provided with a diameter-changing structure; an inner tube (21) slidably disposed in the inner cavity of the outer tube (11); A driving device (4) is provided between the outer tube (11) and the inner tube (21) and is used to convert the axial relative displacement between the outer tube (11) and the inner tube (21) into a radial clamping action; A plurality of placement grooves (22) are provided on the outer wall of the inner tube (21) in an annular array and radially penetrate the inner wall of the inner tube (21); A fixing device (3) is installed in the placement groove (22), comprising a fixing plate (31) and a propulsive member, wherein the propulsive member moves radially to push the fixing plate (31) inward to clamp the steel bars in the inner tube (21); The driving device (4) comprises: A plurality of fixed rods (41) are distributed axially along the inner tube (21) and mounted on the outer wall thereof; A plurality of sawtooth linkage blocks (42) are slidably arranged on the fixed rod (41) and are respectively connected to the propulsive components, and the sawtooth linkage blocks (42) have a sawtooth groove structure (43) for plugging; A plurality of movable rods (44) are mounted on the inner wall of the outer tube (11) in a circular array and are staggered with the fixed rods (41); The inserting rod (45) is rotatably connected to the movable rod (44) and is inserted into the tooth groove structure of the sawtooth linkage block (42) to realize action driving when the outer tube (11) slides relative to the inner tube (21).

2. A steel bar clamping device for connecting lightweight concrete wall panels according to claim 1, characterized in that: The propulsive member comprises a first top plate (32) and a second top plate (33), which are radially stacked in sequence. The contact surfaces between the fixed plate (31) and the first top plate (32) are both wavy structures, and the contact surfaces between the first top plate (32) and the second top plate (33) are both wavy structures.

3. The steel bar clamping device for connecting lightweight concrete wall panels according to claim 2, characterized in that: The lengths of the first top plate (32) and the second top plate (33) are smaller than the length of the placement groove (22).

4. The steel bar clamping device for connecting lightweight concrete wall panels according to claim 3, characterized in that: Before the device is driven, the fixed plate (31) and the first top plate (32), as well as the first top plate (32) and the second top plate (33) are tightly fitted via wavy contact surfaces, and the respective wave crests are correspondingly nested with the wave troughs of adjacent components.

5. The steel bar clamping device for connecting lightweight concrete wall panels according to claim 1, characterized in that: The two sawtooth linkage blocks (42) on each fixed rod (41) are distributed in a mirror image, and the two sawtooth linkage blocks (42) on the same fixed rod (41) can only move in opposite directions.

6. The steel bar clamping device for connecting lightweight concrete wall panels according to claim 1, characterized in that: The free ends of the two groups of insertion rods (45) located on the same side wall of the movable rod (44) extend toward the meshing side walls of the adjacent sawtooth linkage blocks (42).

7. The steel bar clamping device for connecting lightweight concrete wall panels according to claim 1, characterized in that: The meshing surface of the sawtooth groove structure (43) matches the rotation direction of the insertion rod (45).

8. The steel bar clamping device for connecting lightweight concrete wall panels according to claim 2, characterized in that: The first top plate (32) and the second top plate (33) are connected to the corresponding sawtooth linkage blocks (42) in a non-rigid manner.

9. The steel bar clamping device for connecting lightweight concrete wall panels according to claim 1, characterized in that: A slideway (5) is provided on the outer wall of the inner tube (21) at a position corresponding to the movable rod (44).

10. The steel bar clamping device for connecting lightweight concrete wall panels according to claim 1, characterized in that: An elastic metal sheet is provided on the side wall of the fixing plate (31) pointing toward the interior of the inner tube (21).

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