Self-locking anti-settling positioning support device for high-strength steel bar construction and method of use thereof

Abstract

The application discloses a self-locking anti-settling positioning support device for high-strength steel bar construction and a use method thereof, and belongs to the technical field of building construction auxiliary devices. The device comprises a bottom stable support mechanism, a height adjusting mechanism, an elastic buffer anti-settling mechanism and a bidirectional limiting steel bar positioning mechanism. The height adjusting mechanism is arranged above the bottom stable support mechanism, the elastic buffer anti-settling mechanism is arranged at the top of the height adjusting mechanism, and the bidirectional limiting steel bar positioning mechanism is arranged at the top of the elastic buffer anti-settling mechanism. The height adjusting mechanism comprises an adjusting screw rod, an adjusting nut and a locking assembly. The adjusting nut is arranged on the outer side of the adjusting screw rod. The steel bar support height can be adjusted by rotating the adjusting nut. The locking assembly is used for locking the height after adjustment. The elastic buffer anti-settling mechanism is internally provided with elastic elements and is used for buffering the impact load of concrete pouring. The top of the bidirectional limiting steel bar positioning mechanism is provided with bidirectional limiting clamping grooves and is used for forming horizontal and vertical bidirectional limiting constraints on the high-strength steel bar. The use method of the device is also disclosed. The application effectively solves the problems of inconvenient support height adjustment, easy settlement during pouring and insufficient positioning precision in the high-strength steel bar construction, and improves the construction quality.

Description

Technical Field

[0001] This invention relates to the field of auxiliary construction devices, specifically to a self-locking anti-settlement positioning support device for high-strength steel reinforcement construction and its usage method, which is particularly suitable for underground structures, large-span floor slabs, and various concrete structure projects using high-strength steel reinforcement. Background Technology

[0002] In recent years, as construction engineering has developed towards high performance, high efficiency, and green low-carbon directions, high-strength steel bars have been increasingly used in underground structures, large-span floor slabs, and the main structures of large buildings. Taking 635MPa grade high-strength steel bars as an example, they have the characteristics of high strength, high material utilization rate, and excellent structural performance. While meeting the structural load-bearing requirements, they can effectively reduce the amount of steel bars used and improve the economic efficiency of the project.

[0003] However, in actual construction, to match the large load design requirements of the basement roof slab, large-diameter high-strength steel bars are often selected. Each steel bar has a greater self-weight, and the basement roof slab and other structures typically employ a double-layer, two-way steel bar arrangement, significantly increasing the overall weight of the steel mesh. This places higher demands on the structural strength, height adjustment accuracy, impact resistance, and positioning reliability of the steel bar support device.

[0004] Currently, some improved steel reinforcement support structures are already in use in engineering construction. For example, Chinese utility model patent CN209760612U discloses a steel reinforcement support for building engineering. The support frame has grooves at both ends, with movable rods slidably connected within the grooves. One end of the movable rod is fixedly connected to the base plate, and a fixing bolt is provided on one side of the support frame. The height of the support frame can be adjusted by sliding the movable rod within the grooves. After adjusting to the appropriate height, the fixing bolt is rotated to secure the movable rod. This solution achieves adjustable support height to a certain extent.

[0005] Chinese utility model patent CN222413733U discloses an adjustable rebar support for building construction, comprising a lower rebar support and an upper rebar support positioned above it. A screw is movably connected to a fixed box via a bearing seat. The top of the screw extends through the top of the fixed box and is threadedly connected to the bottom of the upper rebar support. A driven sprocket is fixedly connected to the surface of the screw. The screw is driven to rotate through a worm gear and sprocket transmission mechanism, thereby achieving height adjustment of the upper rebar support. This design achieves more precise height adjustment through threaded transmission.

[0006] However, the existing support structure still has the following shortcomings:

[0007] First, the adjustment method and locking reliability are insufficient. CN209760612U uses a combination of a sliding groove and a fixing bolt to achieve height adjustment and fixation. The fixing bolt only locks the moving rod through friction or clamping. During concrete pouring and vibration, continuous vibration and impact can easily cause the fixing bolt to loosen, causing the adjusted height to revert. Although CN222413733U achieves height adjustment through threaded transmission, it lacks a dedicated locking mechanism. After adjustment, it relies solely on the self-locking performance of the thread pair to maintain the height. Under continuous vibration conditions, there is also a risk of thread loosening and height drift.

[0008] Second, there is a lack of buffering and energy absorption mechanisms. Both of the above-mentioned support structures are rigid supports. During the concrete pouring process, the high-intensity dynamic impact load generated by the large-diameter aggregate falling from the pump pipe outlet on the steel mesh is directly transferred to the formwork through the rigid support. The steel mesh undergoes elastic rebound and settlement due to the instantaneous impact, which can easily lead to changes in the steel elevation and affect the accuracy of the protective layer thickness control.

[0009] Third, there is a lack of horizontal constraints. The aforementioned support structures only provide vertical support and lack the function of limiting the horizontal direction of the reinforcing bars. During the concrete pouring process, the flow impact of pumped concrete will generate lateral thrust on the reinforcing bars, which can easily lead to lateral slippage and changes in spacing of the reinforcing bars, making it difficult to ensure accurate positioning of high-strength reinforcing bars during construction.

[0010] In summary, existing rebar support devices still have significant shortcomings in terms of locking reliability during height adjustment, effective buffering and absorption of impact loads from pouring, and bidirectional constraint of the rebar's spatial position. An improved solution that can simultaneously address these issues is urgently needed.

[0011] The information disclosed in this background section is intended only to enhance the understanding of the overall background of the invention and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0012] This invention aims to at least partially solve one of the technical problems in related technologies. To this end, this invention proposes a self-locking anti-settlement positioning support device and its usage method for high-strength steel reinforcement construction. This device can not only achieve flexible adjustment and reliable locking of the support height, but also effectively buffer the impact load generated during concrete pouring, and can form a two-way limiting constraint on the high-strength steel reinforcement in both horizontal and vertical directions.

[0013] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0014] A self-locking anti-settlement positioning support device for high-strength steel reinforcement construction includes a bottom stabilizing support mechanism, a height adjustment mechanism, an elastic buffer anti-settlement mechanism, and a bidirectional limiting steel reinforcement positioning mechanism. The height adjustment mechanism is located above the bottom stabilizing support mechanism, the elastic buffer anti-settlement mechanism is located at the top of the height adjustment mechanism, and the bidirectional limiting steel reinforcement positioning mechanism is located at the top of the elastic buffer anti-settlement mechanism.

[0015] The height adjustment mechanism includes an adjusting screw, an adjusting nut, and a locking assembly. The adjusting nut is sleeved on the outside of the adjusting screw. The height of the steel bar support is adjusted by rotating the adjusting nut, and the adjusted height is mechanically locked by the locking assembly.

[0016] The elastic buffer anti-settlement mechanism is equipped with an elastic element inside, which buffers the impact load generated during the concrete pouring process through the elastic deformation of the elastic element.

[0017] The bidirectional limiting rebar positioning mechanism is provided with a bidirectional limiting slot at the top, which forms a bidirectional limiting constraint on the high-strength rebar in both the horizontal and vertical directions.

[0018] Furthermore, the elastic buffer anti-settlement mechanism includes a lower connecting plate, an upper connecting plate, a limiting sleeve, and a buffer spring. The upper connecting plate and the lower connecting plate are arranged in parallel. The limiting sleeve is fixedly connected between the upper connecting plate and the lower connecting plate. The buffer spring constitutes the elastic element and is installed inside the limiting sleeve. The bottom of the buffer spring abuts against the lower connecting plate. The upper end of the adjusting screw is a smooth stepped shaft, and the smooth stepped shaft is fixedly connected to the bottom center position of the lower connecting plate.

[0019] Furthermore, the bidirectional limiting rebar positioning mechanism includes a top support plate and a bidirectional limiting slot disposed on the top support plate. The bottom of the top support plate is fixedly connected to the top of the buffer spring through a central shaft passing through the upper connecting plate.

[0020] Furthermore, the bidirectional limiting groove includes two sets of oppositely arranged clamping plates, each set of clamping plates having a groove in the middle along the vertical direction, and the bottom of the groove having an arc-shaped groove surface adapted to the outer circumference of the reinforcing bar; the bidirectional limiting groove forms a bidirectional limiting constraint in both the horizontal and vertical directions for the high-strength reinforcing bar placed therein.

[0021] Furthermore, the bidirectional limiting slot is a detachable and replaceable structure, which can be adapted to high-strength steel bars of different diameters by replacing the slot plates with different slot sizes.

[0022] Furthermore, the bottom stabilizing support mechanism, the height adjustment mechanism, the elastic buffer anti-settlement mechanism, and the bidirectional limiting rebar positioning mechanism are coaxially arranged.

[0023] Furthermore, the bottom stabilizing support mechanism includes a support base plate and a connecting sleeve disposed above the support base plate. The support base plate adopts a plate-like structure to increase the contact area between the device and the template. The lower end of the adjusting screw is provided with an external thread, and the inner hole of the connecting sleeve is provided with an internal thread. The lower end of the adjusting screw is threadedly connected to the connecting sleeve.

[0024] This invention also provides a method for using a self-locking anti-settlement positioning support device for high-strength steel reinforcement construction, the specific construction process of which is as follows:

[0025] Before construction, determine the protective layer thickness of the floor slab or basement roof slab and the design elevation of the reinforcing mesh according to the structural design drawings. Place this device above the formwork at the designed spacing. Rotate the adjusting nut to move the adjusting screw, which in turn moves the top elastic buffer anti-settlement mechanism and the bidirectional limiting reinforcing bar positioning mechanism to the designed elevation position. After adjustment, tighten the locking assembly to mechanically lock and fix the adjusted height, preventing vibrations during construction from causing changes in the support height.

[0026] Subsequently, the high-strength reinforcing bars are placed in the bidirectional limiting slots at the top of the bidirectional limiting reinforcing bar positioning mechanism. These slots provide bidirectional limiting constraints on the reinforcing bars in both horizontal and vertical directions, ensuring that the reinforcing bars maintain their designed position throughout the binding and pouring process. During concrete pouring, the concrete impact load is first transmitted to the bidirectional limiting reinforcing bar positioning mechanism. Upon passing through the elastic buffer anti-settlement mechanism, the elastic element undergoes appropriate elastic deformation, absorbing some of the impact energy and prolonging the load's duration. This reduces the peak impact force transmitted to the height adjustment mechanism and the bottom stabilizing support mechanism, effectively reducing the instantaneous and cumulative settlement of the reinforcing mesh under impact loads. Simultaneously, the bottom stabilizing support mechanism increases the contact area between the support base plate and the formwork, reducing the pressure per unit area and preventing the support device from sinking into the formwork or overturning under impact loads. This ensures that the high-strength reinforcing bars remain at the designed elevation from the start of pouring until the initial setting of the concrete.

[0027] Compared with the prior art, the present invention has the following advantages:

[0028] (1) By setting up a height adjustment mechanism consisting of an adjusting screw, an adjusting nut and a locking assembly, the present invention realizes continuous stepless adjustment of the support height. Compared with the existing gear or slide type adjustment method, the adjustment accuracy is higher and can adapt to the construction needs of different plate thickness structures. At the same time, the locking assembly can mechanically lock the height position after the adjustment is completed, which effectively solves the problem that the existing adjustable trestles are easy to loosen and retract during the vibration process.

[0029] (2) By setting an elastic buffer anti-settlement mechanism between the height adjustment mechanism and the bidirectional limiting steel bar positioning mechanism, the present invention transforms the "rigid support" of traditional steel bar support into a "flexible buffer support". During the concrete pouring process, the elastic deformation of the elastic element absorbs the impact load, effectively solving the technical problem that large-diameter high-strength steel mesh is prone to settlement under the combined action of its own weight and concrete impact, and ensuring that the thickness of the steel bar protective layer meets the design requirements.

[0030] (3) By setting a bidirectional limiting slot at the top of the bidirectional limiting rebar positioning mechanism, the present invention achieves bidirectional constraint on the horizontal and vertical directions of the high-strength rebar, overcomes the defect of the traditional support structure that only provides vertical support and lacks horizontal limiting function, effectively prevents the lateral slippage and vertical jumping of the rebar during the concrete pouring process, and ensures the accurate positioning of the high-strength rebar construction.

[0031] (4) The present invention increases the contact area between the device and the template by designing the support base plate of the bottom stable support mechanism, which improves the device’s anti-overturning and anti-slip stability under impact load and construction trampling conditions, and further ensures the spatial position accuracy of the steel mesh.

[0032] (5) The present invention has a reasonable overall structural design and is easy to operate. The functional modules work together to systematically solve a number of technical problems in the construction of high-strength steel bars, such as inconvenience in adjusting the support height, easy settlement during the pouring process, and insufficient positioning accuracy of steel bars. It has good prospects for promotion and application. Attached Figure Description

[0033] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0034] Figure 1 This is a three-dimensional structural diagram of a self-locking anti-settlement positioning support device for high-strength steel reinforcement construction provided in an embodiment of the present invention.

[0035] Figure 2 This is a side view of the self-locking anti-settlement positioning support device for high-strength steel reinforcement construction provided in an embodiment of the present invention.

[0036] Figure 3 This is a top view of the self-locking anti-settlement positioning support device for high-strength steel reinforcement construction provided in an embodiment of the present invention.

[0037] Meaning of the labels in the attached diagram:

[0038] 1- Bottom stabilization support mechanism;

[0039] 11-Support base plate;

[0040] 12-Connecting sleeve;

[0041] 2- Height adjustment mechanism;

[0042] 21-Adjusting screw; 211-Smooth stepped shaft;

[0043] 22-Adjusting nut;

[0044] 23-Locking assembly;

[0045] 3-Elastic buffer anti-settlement mechanism;

[0046] 31-Lower connecting plate;

[0047] 32-Upper connecting plate;

[0048] 33 - Limiting sleeve;

[0049] 34 - Buffer spring;

[0050] 4- Bidirectional limiting rebar positioning mechanism;

[0051] 41-Top support plate; 411-Central shaft;

[0052] 42-Two-way limit card slot;

[0053] 421-Panel;

[0054] 4211 - Card slot. Detailed Implementation

[0055] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0056] Example 1

[0057] like Figures 1 to 3 As shown in the figure, this embodiment provides a self-locking anti-settlement positioning support device for high-strength steel reinforcement construction, including a bottom stabilizing support mechanism 1, a height adjustment mechanism 2, an elastic buffer anti-settlement mechanism 3, and a bidirectional limiting steel reinforcement positioning mechanism 4. The bottom stabilizing support mechanism 1 is located at the bottom of the entire device, used to contact the upper surface of the formwork and transfer the device load to the formwork. The height adjustment mechanism 2 is located above the bottom stabilizing support mechanism 1, the elastic buffer anti-settlement mechanism 3 is located at the top of the height adjustment mechanism 2, and the bidirectional limiting steel reinforcement positioning mechanism 4 is located at the top of the elastic buffer anti-settlement mechanism 3. The bottom stabilizing support mechanism 1, the height adjustment mechanism 2, the elastic buffer anti-settlement mechanism 3, and the bidirectional limiting steel reinforcement positioning mechanism 4 are coaxially arranged along the same vertical axis to ensure a vertical load transfer path and avoid additional bending moments that could affect the stability of the device.

[0058] It should be noted that in other feasible embodiments, the connection method between the components is not limited to coaxial arrangement, and can be adapted according to the specific structural layout, as long as the load can be vertically transferred from top to bottom.

[0059] like Figure 1 and Figure 2 As shown, the bottom stabilizing support mechanism 1 in this embodiment includes a support base plate 11 and a connecting sleeve 12 disposed above the support base plate 11. The support base plate 11 adopts a circular or square plate structure and is made of Q235B steel. The lower surface of the support base plate 11 is a flat plane for contacting the upper surface of the structural formwork. By setting the plate-shaped support base plate 11, the contact area between the device and the formwork is significantly increased, thereby effectively reducing the pressure per unit area and preventing the support base plate 11 from sinking into the formwork or causing uneven settlement under the impact of concrete pouring and the trampling of construction personnel. At the same time, increasing the contact area also improves the overturning resistance of the device, making it less likely to tip over or slip when subjected to lateral impact forces. The specific area of ​​the support base plate 11 can be determined according to the bearing capacity calculation to ensure that the pressure per unit area of ​​the formwork under construction load does not exceed the design bearing capacity of the formwork.

[0060] Furthermore, in this embodiment, the connecting sleeve 12 is welded and fixed to the center position of the upper surface of the support base plate 11. The connecting sleeve 12 is made of seamless steel pipe, and its inner hole is provided with internal threads for connection with the bottom thread of the height adjustment mechanism 2. The connecting sleeve 12 has sufficient connection strength and thread engagement length to ensure reliable load transmission. The central axis of the support base plate 11 and the connecting sleeve 12 coincides to ensure that the load is transmitted in the vertical direction.

[0061] like Figure 1 and Figure 2 As shown in the figure, this embodiment is as follows Figure 2 and Figure 3 As shown, the height adjustment mechanism 2 includes an adjusting screw 21, an adjusting nut 22, and a locking assembly 23. The adjusting screw 21 is an externally threaded rod with an external thread at its lower end, and is threadedly connected to the connecting sleeve 12 of the bottom stabilizing support mechanism 1. The adjusting nut 22 is sleeved on the outside of the adjusting screw 21, and the internal thread of the adjusting nut 22 engages with the external thread of the adjusting screw 21. The outer circumferential surface of the adjusting nut 22 is provided with anti-slip texture or a pair of radial handles to facilitate rotation operation by construction personnel.

[0062] In this embodiment, the upper end of the adjusting screw 21 is a smooth stepped shaft 211. The smooth stepped shaft 211 passes upward through the lower connecting plate 31 and the upper connecting plate 32 of the elastic buffer anti-settlement mechanism 3. The upper end of the smooth stepped shaft 211 is fixedly connected to the bottom center position of the lower connecting plate 31.

[0063] In practice, by rotating the adjusting nut 22, the adjusting screw 21 cannot rotate freely due to the thread constraint of the connecting sleeve 12. The adjusting screw 21 moves axially along the connecting sleeve 12, thereby driving the lower connecting plate 31, fixed on the smooth stepped shaft 211, to move synchronously, achieving continuous stepless adjustment of the support height. During adjustment, the adjusting nut 22 only rotates around the adjusting screw 21, and its axial position remains unchanged. Compared to the existing technology that uses insertion holes or grooves for level adjustment, the threaded adjustment method in this embodiment can achieve millimeter-level continuous adjustment, significantly improving adjustment accuracy and more precisely meeting the design requirements for rebar elevation in structures with different plate thicknesses.

[0064] Furthermore, in this embodiment, the locking component 23 is sleeved outside the adjusting screw 21 and located below the adjusting nut 22. In this embodiment, the locking component 23 is a radial set screw, and the side wall of the adjusting nut 22 has a threaded hole. The radial set screw is screwed into the threaded hole and abuts against the external thread of the adjusting screw 21. When the adjusting nut 22 is rotated to the design elevation position, the radial set screw is tightened so that its end abuts against the external thread of the adjusting screw 21. By locking the rotational freedom of the adjusting nut 22 relative to the adjusting screw 21, the adjusting nut 22 is prevented from rotating in the opposite direction and loosening due to vibration during concrete pouring and vibration, thereby avoiding the support height from shrinking. In other embodiments, the locking component 23 can also be a locking nut or a locking washer.

[0065] In practical implementation, the adjusting screw 21 and adjusting nut 22 are made of heat-treated steel. The thread profile can be trapezoidal or ordinary metric thread, and its diameter and thread parameters are determined based on load-bearing capacity calculations to ensure sufficient load-bearing capacity and fatigue resistance, meeting the load-bearing requirements of the high-strength steel mesh self-weight and concrete pouring load. The adjusting stroke of the adjusting screw 21 can be determined according to the commonly used plate thickness range in the project to adapt to the construction needs of structural plates of different thicknesses.

[0066] As an alternative, the height adjustment mechanism 2 can also use a hydraulic or pneumatic lifting structure combined with a mechanical locking device to achieve height adjustment, so as to be suitable for special construction scenarios with larger strokes or heavier loads.

[0067] like Figure 1-3As shown, the elastic buffer anti-settlement mechanism 3 of this embodiment is disposed between the top of the height adjustment mechanism 2 and the bottom of the bidirectional limiting rebar positioning mechanism 4. The elastic element is a buffer spring 34. The elastic buffer anti-settlement mechanism 3 specifically includes a lower connecting plate 31, an upper connecting plate 32, a limiting sleeve 33, and a buffer spring 34. The upper connecting plate 32 and the lower connecting plate 31 are arranged in parallel. The limiting sleeve 33 is fixedly connected between the upper connecting plate 32 and the lower connecting plate 31. The buffer spring 34 constitutes an elastic element and is installed inside the limiting sleeve 33. The bottom of the buffer spring 34 abuts against the lower connecting plate 31. The upper end of the adjusting screw 21 is a smooth stepped shaft 211, which is fixedly connected to the bottom center position of the lower connecting plate 31.

[0068] The stiffness of the buffer spring 34 is determined based on the design load and allowable settlement. Furthermore, the buffer spring 34 can be a compression coil spring, made of 60Si2Mn or 50CrVA spring steel. When the bidirectional limiting rebar positioning mechanism 4 bears a vertical load (rebar self-weight, concrete impact load, etc.), the load is transferred to the buffer spring 34 through the top support plate 41. The buffer spring 34 undergoes compression deformation, converting some of the impact energy into elastic potential energy, thereby prolonging the load application time, reducing the peak load, and effectively buffering the impact load generated during concrete pouring.

[0069] During concrete pouring, the peak impact load generated when concrete falls from the pump pipe outlet onto the reinforcing mesh can reach several kN. If a traditional rigid support structure is used, this impact load is directly transmitted to the formwork through the rigid support. The reinforcing mesh experiences elastic rebound and settlement due to the instantaneous impact, which can easily lead to deviations in the protective layer thickness. However, this embodiment uses an elastic buffer anti-settlement mechanism 3, which allows the impact load to be absorbed by the buffer spring 34 first. The vertical displacement of the reinforcing mesh exhibits a buffered and gradual change rather than a rigid abrupt change, effectively reducing the instantaneous and cumulative settlement of the reinforcing mesh and ensuring the elevation accuracy of the high-strength reinforcing steel.

[0070] More importantly, in this embodiment, a mechanically coupled synergistic anti-settlement mechanism is formed between the elastic buffer anti-settlement mechanism 3 and the locking component 23 of the height adjustment mechanism 2. Specifically, in traditional adjustable support devices, the impact load acts directly on the adjusting thread pair, causing the thread pair to bear high-frequency vibration loads, which easily leads to thread loosening. In this application, after the impact load is absorbed by the elastic buffer anti-settlement mechanism 3, the peak impact force transmitted to the adjusting nut 22 and the locking component 23 is significantly reduced, and the anti-loosening reliability of the locking component 23 is significantly improved. At the same time, after the locking component 23 is locked, the buffer spring 34 is kept in a stable pre-tight state, avoiding the cumulative compression of the buffer spring 34 under repeated impacts, which would cause the support height to gradually decrease. The "buffering energy absorption → reducing thread impact → locking to prevent loosening → maintaining pre-tightness → maintaining buffering effect" forms a positive feedback synergistic effect, systematically solving the settlement problem of high-strength steel mesh during the pouring process.

[0071] In other embodiments, the buffer spring 34 can also be a combination of disc springs or wave springs to adapt to different load conditions and installation space requirements. Under heavy load conditions, multiple disc springs can be stacked to improve load-bearing capacity; under conditions requiring a large buffer stroke, multiple helical springs can be connected in parallel or series. In addition, the elastic buffer anti-settlement mechanism 3 can also use elastic rubber pads or polyurethane buffer blocks as alternatives to meet the buffering needs under different engineering conditions.

[0072] like Figure 1-2 As shown, the bidirectional limiting rebar positioning mechanism 4 of this embodiment is disposed at the top of the elastic buffer anti-settlement mechanism 3. The bidirectional limiting rebar positioning mechanism 4 includes a top support plate 41 and a bidirectional limiting slot 42 disposed on the top support plate 41. The bottom of the top support plate 41 is fixedly connected to the top of the buffer spring 34 through the upper connecting plate 32 via a central shaft 411.

[0073] Furthermore, in this embodiment, the bidirectional limiting slot 42 includes two sets of oppositely arranged slots 421. Each set of slots 421 has a slot 4211 in the middle along the vertical direction. The bottom of the slot 4211 has an arc-shaped groove surface that matches the outer circumferential surface of the steel bar. The curvature of the arc-shaped groove surface matches the outer circumferential surface of the high-strength steel bar 15, that is, the radius of curvature of the arc-shaped groove surface matches the radius of the steel bar.

[0074] Preferably, the arc-shaped groove surface of the bidirectional limiting groove 42 extends upward from the bottom to the opening, and the width of the opening is slightly larger than the diameter of the reinforcing bar to facilitate its insertion. The lowest point of the arc-shaped groove surface is lower than the opening plane. When the high-strength reinforcing bar 15 is placed in the bidirectional limiting groove 42, the lower part of the outer circumference of the reinforcing bar is in close contact with the arc-shaped groove surface, and the arc-shaped groove surface provides support for the reinforcing bar. A single groove 4211 provides vertical limiting for the reinforcing bar through its arc-shaped groove bottom and side groove walls, while two sets of oppositely arranged clamping plates 421 hold the reinforcing bar in the middle from both sides, forming a horizontal limiting. The combination of the two achieves bidirectional limiting constraint on the reinforcing bar in both the horizontal and vertical directions.

[0075] Compared to traditional stirrups that only provide vertical support in existing technologies, this embodiment achieves bidirectional synchronous constraint on the horizontal and vertical directions of the reinforcing bars through a bidirectional limiting groove 42. During concrete pouring, the flow impact of pumped concrete generates a lateral thrust in the horizontal direction on the reinforcing bars, causing lateral slippage and spacing changes. The bidirectional limiting groove 42 of this embodiment effectively resists this lateral thrust, ensuring that the reinforcing bars maintain their designed spacing and position. Simultaneously, during concrete vibration, the vertical vibration generated by the vibrator may cause the reinforcing bars to jump vertically. The groove wall of the groove 4211 in this embodiment restricts the upward jump of the reinforcing bars, ensuring that the upper deviation of the reinforcing bar protective layer thickness is controlled.

[0076] Furthermore, in this embodiment, the bidirectional limiting groove 42 is a detachable and replaceable structure. By replacing the clamping plate 421 with different groove 4211 sizes, it can accommodate high-strength steel bars of different diameters. Specifically, the clamping plate 421 and the top support plate 41 are detachably fixed by bolt connection or snap-fit ​​connection. When it is necessary to adapt to high-strength steel bars of different diameters, only the clamping plate 421 with the corresponding groove 4211 size needs to be removed and replaced, without replacing the entire top support plate 41. In addition, elastic buckles or tightening screws can be provided on both sides of the groove opening of the bidirectional limiting groove 42 to form auxiliary clamping of the steel bar after it is inserted, further improving the reliability of limiting.

[0077] As an alternative, the bidirectional limiting slot 42 can also be configured with replaceable slot inserts on the top of the top support plate 41. Specifically, the top of the top support plate 41 has an installation groove, and slot inserts with different arc-shaped groove dimensions can be detachably installed within this groove. By replacing the slot inserts, adaptation to different specifications of reinforcing bars can be achieved. This structural solution is more convenient in construction scenarios where frequent changes in reinforcing bar specifications are required.

[0078] In the overall assembly of the self-locking anti-settlement positioning support device of the present invention, the adjusting nut 22 is first inserted from the lower end of the adjusting screw 21 and screwed to the appropriate position of the adjusting screw 21. Then, the lower end of the adjusting screw 21 is screwed into the connecting sleeve 12 of the bottom stabilizing support mechanism 1 and tightened to the initial design position. The lower connecting plate 31 is fixedly connected to the smooth stepped shaft 211 at the upper end of the adjusting screw 21. The limiting sleeve 33 is fixedly connected to the upper end face of the lower connecting plate 31, and the buffer spring 34 is installed inside the limiting sleeve 33, with the bottom of the buffer spring 34 abutting against the lower connecting plate 31. The upper connecting plate 32 is fixedly connected to the top of the limiting sleeve 33, so that the top of the buffer spring 34 protrudes from the upper connecting plate 32. The central shaft 411 at the bottom of the top support plate 41 of the bidirectional limiting rebar positioning mechanism 4 passes through the upper connecting plate 32 and is fixedly connected to the top of the buffer spring 34. Finally, the locking assembly 23 is inserted from the lower end of the adjusting screw 21 and screwed to pre-tighten below the adjusting nut 22.

[0079] It should be noted that, in other feasible embodiments, the relative size of the outer diameter of the smooth stepped shaft 211 and the outer diameter of the threaded portion of the adjusting screw 21 can be determined according to specific design requirements. The assembly direction of the adjusting nut 22 can also be adaptively adjusted according to the specific structural layout, as long as the threaded engagement between the adjusting nut 22 and the adjusting screw 21 can be achieved.

[0080] The following describes in detail the synergistic mechanism of the self-locking anti-settlement positioning support device of the present invention, in conjunction with a specific construction process.

[0081] Before construction, determine the protective layer thickness of the floor slab or basement roof slab and the design elevation of the reinforcing mesh according to the structural design drawings. Place this device on top of the formwork at the designed spacing (usually 800-1500mm).

[0082] Step 1: Height Adjustment. Construction workers rotate the adjusting nut 22. Because the adjusting screw 21 is constrained by the thread of the connecting sleeve 12 and cannot rotate freely, the adjusting screw 21 moves axially along the connecting sleeve 12. This, in turn, drives the lower connecting plate 31 to move synchronously via the smooth stepped shaft 211. Then, through the limiting sleeve 33, buffer spring 34, and upper connecting plate 32, the bidirectional limiting rebar positioning mechanism 4 moves synchronously to the design elevation position. During adjustment, the threaded engagement between the adjusting nut 22 and the adjusting screw 21 converts rotational motion into axial movement of the adjusting screw 21, thus achieving continuous stepless adjustment of the support height. After adjustment, tighten the locking assembly 23 (radial set screw) so that its end abuts against the external thread of the adjusting screw 21, generating a locking force to prevent the adjusting nut 22 from loosening due to vibration during subsequent construction.

[0083] Step 2: Rebar Positioning and Bidirectional Limitation. The high-strength rebar 15 is placed in the bidirectional limiting slot 42 at the top of the bidirectional limiting rebar positioning mechanism 4. The arc-shaped groove surface of the slot 4211 fits against the outer circumference of the rebar, forming a bidirectional limiting constraint on the rebar in both the horizontal and vertical directions. The lower layer of the double-layer bidirectional rebar mesh is placed in the bidirectional limiting slot 42 of this device, and the upper layer of rebar is connected to the lower layer of rebar through U-shaped positioning bars or special support components, thereby achieving the overall positioning of the double-layer rebar mesh.

[0084] Step 3: Coordinated Operations During Concrete Pouring. During concrete pouring, the large volume of concrete falling from the pump pipe outlet generates a significant impact load on the reinforcing mesh. This impact load first acts on the top support plate 41 of the bidirectional limiting reinforcing bar positioning mechanism 4, and is transmitted to the buffer spring 34 via the central axis 411 at the bottom of the top support plate 41. The buffer spring 34 undergoes compression deformation, converting the impact energy into stored elastic potential energy, which is then slowly released after the impact. Through elastic buffering, the peak value of the impact load is significantly reduced, and the load transmitted to the height adjustment mechanism 2 and the bottom stabilizing support mechanism 1 becomes more gradual.

[0085] Furthermore, this device achieves continuous stepless adjustment of the support height through the threaded engagement between the adjusting nut 22 and the adjusting screw 21. Taking the adjusting screw 21 with a pitch of 3mm as an example, the axial displacement corresponding to a 1° rotation of the adjusting nut 22 is approximately 0.008mm. Even considering the threaded engagement clearance, an adjustment accuracy of 0.1-0.2mm can still be achieved. Combined with the mechanical locking of the locking assembly 23, it ensures that the deviation of the support height during construction is controlled within a small range, meeting the current construction quality acceptance specifications for concrete structure engineering regarding the accuracy requirements for the protective layer thickness.

[0086] The key synergistic effects of this invention are mainly reflected in the following three aspects:

[0087] (1) "Buffering-Locking" Synergistic Anti-Loosening. The buffering effect of the buffer spring 34 reduces the peak impact load acting on the adjusting threaded pair, avoiding fretting wear and loosening tendency of the threaded pair under severe vibration. At the same time, the locking force applied by the locking component 23 after adjustment keeps the threaded pair in a stable frictional self-locking state, and the adjusted height will not retract even after multiple impact loading-unloading cycles. This synergistic cooperation of "buffering and unloading + locking and anti-loosening" ensures that the device maintains the initially set elevation position throughout the entire concrete pouring process.

[0088] (2) "Buffer-Limit" Synergistic Anti-sinking. The buffer spring 34 absorbs vertical impact loads, and the bidirectional limiting groove 42 constrains the horizontal direction of the reinforcing bar, together forming a comprehensive stability system for the spatial position of the reinforcing bar. Vertical impacts are buffered and absorbed to prevent elevation settlement, and horizontal impacts are resisted by the groove 4211 to prevent lateral slippage. The two work together to ensure the positional stability of the reinforcing bar in three-dimensional space.

[0089] (3) The “base plate-buffer-limiting” system is stable. The bottom stabilizing support mechanism 1 increases the contact area and reduces the grounding pressure by supporting the base plate 11, providing a stable foundation for the entire device. The elastic buffer anti-settlement mechanism 3 absorbs impact energy and reduces the peak load, and the bidirectional limiting slot 42 forms a spatial constraint on the reinforcing bars. The three form a systematic anti-settlement chain of “stable foundation → reduced impact → stable reinforcing bars”, which fundamentally solves the three major technical problems of traditional reinforcing bar support: “fixed and unadjustable height, rigid support is prone to settlement, and unidirectional support is prone to displacement”.

[0090] The self-locking anti-settlement positioning support device of the present invention has an adaptability design for high-strength steel bars:

[0091] High-strength steel bars (such as 635MPa grade) have a significantly higher yield strength than ordinary HRB400 steel bars. They also have a higher yield strength ratio and relatively lower ductility, making them more sensitive to additional stress and impact loads during construction. If a traditional rigid support structure is used, the instantaneous high stress generated by the impact of concrete pouring may cause local stress concentration or micro-vibration fatigue risk at the bottom of the high-strength steel bars.

[0092] In this embodiment, the elastic buffer anti-settlement mechanism 3 reduces the impact of peak impact load and stress wave on high-strength steel bars by flexibly buffering the impact load, ensuring that the high-strength steel bars remain in a stable stress state before the initial setting of the concrete. Simultaneously, the large contact area between the arc-shaped groove surface of the bidirectional limiting slot 42 and the outer circumference of the high-strength steel bar avoids the localized indentations and stress concentrations at the bottom of the steel bar caused by the traditional "point contact" support method of the stirrups, thus helping to ensure that the mechanical properties of the high-strength steel bars are not affected by the construction process.

[0093] In addition, for high-strength steel bars with larger diameters (such as φ28-φ40), the contact area with the steel bar can be increased by replacing the clamping plate 421 with a different size of the clamping groove 4211, thereby further reducing the contact stress and effectively preventing local plastic deformation of large-diameter high-strength steel bars at the support point.

[0094] Example 2

[0095] This embodiment provides a method for using a self-locking anti-settlement positioning support device for high-strength steel reinforcement construction, including the following steps:

[0096] Step 1: Determine the design elevation and protective layer thickness requirements of the reinforcing mesh for the floor slab or basement roof slab based on the structural design drawings. Evenly distribute the self-locking anti-settlement positioning support devices on the upper surface of the formwork at the designed spacing. The spacing of the devices is determined through structural calculations based on the self-weight of the reinforcing mesh, construction loads, and single-point bearing capacity to ensure the safety and reliability of the support system.

[0097] Step Two: Rotate the adjusting nut 22 to move the adjusting screw 21, which in turn moves the elastic buffer anti-settlement mechanism 3 and the bidirectional limiting rebar positioning mechanism 4 to the designed elevation position. During the adjustment process, a level or laser level can be used to verify the elevation, ensuring that the top elevations of all devices are consistent. After adjustment, tighten the locking assembly 23 to mechanically lock and fix the adjusted height, preventing height changes during construction.

[0098] Step 3: Place the high-strength steel bar 15 into the bidirectional limiting groove 42 at the top of the bidirectional limiting steel bar positioning mechanism 4. The arc-shaped groove surface of the groove 4211 fits against the outer circumference of the steel bar, forming a bidirectional limiting constraint on the steel bar in both the horizontal and vertical directions. For double-layer bidirectional steel mesh, first place the lower layer of steel bars on this device, and then install the upper layer of steel bars through U-shaped positioning bars or special support components.

[0099] Step Four: Concrete Pouring Operation. During the pouring process, the concrete impact load is first transferred to the top support plate 41 of the bidirectional limiting rebar positioning mechanism 4, and then to the buffer spring 34 via the central axis 411 at the bottom of the top support plate 41. The buffer spring 34 undergoes compression deformation, absorbing part of the impact energy and prolonging the load application time, thus reducing the peak impact force transmitted to the height adjustment mechanism 2 and the bottom stabilizing support mechanism 1. Simultaneously, the bottom stabilizing support mechanism 1 reduces the pressure per unit area by increasing the contact area between the support base plate 11 and the formwork, preventing the support base plate 11 from sinking into the formwork or overturning / slipping. The bidirectional limiting slot 42 provides bidirectional limiting constraints on the rebar in both the horizontal and vertical directions, preventing lateral slippage or vertical jumping of the rebar under the impact and vibration of the flowing concrete. Through the coordinated operation of these mechanisms, the high-strength rebar remains at the design elevation from the start of pouring until the initial setting of the concrete, effectively ensuring the construction quality of the rebar protective layer thickness.

[0100] Step 5: After the concrete has initially set, the adjusting nut 22 can be loosened upwards to restore the elastic buffer anti-settlement mechanism 3 to its natural state. The device can then be removed from the surface of the initially set concrete and, after cleaning, can be reused in the next construction section.

[0101] As a supplementary solution to the construction method, for large-volume concrete or ultra-thick slab structures, when the adjustment stroke of a single-layer device is insufficient, multiple devices can be connected in series for use. That is, an extension base or transition connector can be added below the bottom stable support mechanism 1 to achieve a greater range of support height.

[0102] In practical applications, this invention achieves the following significant advantages:

[0103] 1. This invention transforms the traditional "rigid support" of steel reinforcement into a "flexible buffer support" by setting an elastic buffer anti-settlement mechanism 3 between the height adjustment mechanism 2 and the bidirectional limiting steel reinforcement positioning mechanism 4. During the concrete pouring process, the compression deformation of the buffer spring 34 absorbs the impact load, effectively solving the settlement problem of large-diameter high-strength steel mesh under the combined action of its own weight and concrete impact. The accuracy of steel reinforcement elevation control can be greatly improved, and the qualified rate of protective layer thickness can be significantly increased.

[0104] 2. By setting a bidirectional limiting slot 42 on the top of the bidirectional limiting rebar positioning mechanism 4, the present invention achieves bidirectional synchronous constraint on the horizontal and vertical directions of high-strength rebar, overcomes the defect of traditional support structures that only provide vertical support and lack horizontal limiting function, effectively prevents the lateral slippage and vertical jumping of rebar during concrete pouring, and ensures precise control of rebar spacing and protective layer thickness.

[0105] 3. This invention achieves continuous stepless adjustment of the support height by setting up a height adjustment mechanism 2 consisting of an adjusting screw 21, an adjusting nut 22, and a locking assembly 23. Compared with the existing gear-type or sliding groove-type adjustment methods, it has higher precision and stronger adaptability, and can meet the construction needs of different plate thickness structures. At the same time, the locking assembly 23 mechanically locks the height position after adjustment, effectively solving the problem that existing adjustable trestles are prone to loosening and retraction during vibration.

[0106] 4. The present invention increases the contact area between the device and the template by designing the support base plate 11 of the bottom stabilizing support mechanism 1, reduces the pressure per unit area, effectively prevents the support device from sinking into the template or overturning and sliding under impact load, and further ensures the spatial position accuracy of the steel mesh.

[0107] 5. This invention, through the serial layout and mechanical coupling of four functional modules, forms a systematic synergistic effect of "stable foundation → accurate height → mitigated impact → fixed reinforcement." The functions of each module support and enhance each other, and the overall technical effect far exceeds the simple summation of the effects of each module. It systematically solves several technical problems in the construction of high-strength steel reinforcement, such as inconvenience in adjusting the support height, easy settlement during the pouring process, and insufficient positioning accuracy of the reinforcement. Compared with the existing technical solutions that simply superimpose the functions of each module, the integrated layout of "adjustment-locking-buffering-limiting" of this invention produces synergistic effects at the structural mechanics level. Among them, the positive feedback relationship between elastic buffering and locking to prevent loosening is the most significant, and its overall technical effect has outstanding substantive characteristics and significant progress.

[0108] 6. The invention has a simple and reasonable overall structure, is easy to operate, and uses common engineering materials and standard parts for each component. It has low manufacturing cost, is reusable, and is suitable for construction of underground structures, large-span floor slabs, and various concrete structures using high-strength steel bars. It has good prospects for promotion and application.

[0109] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0110] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0111] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0112] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention in any way. Any simple modifications and equivalent changes made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A self-locking anti-settlement positioning support device for high-strength steel reinforcement construction, characterized in that, This includes a bottom stabilizing support mechanism, a height adjustment mechanism, an elastic buffer anti-settlement mechanism, and a two-way limiting rebar positioning mechanism; The height adjustment mechanism is located above the bottom stabilizing support mechanism, the elastic buffer anti-settlement mechanism is located at the top of the height adjustment mechanism, and the bidirectional limiting steel bar positioning mechanism is located at the top of the elastic buffer anti-settlement mechanism. The height adjustment mechanism includes an adjusting screw, an adjusting nut, and a locking assembly. The adjusting nut is sleeved on the outside of the adjusting screw. The height of the steel bar support is adjusted by rotating the adjusting nut, and the adjusted height is mechanically locked by the locking assembly. The elastic buffer anti-settlement mechanism is equipped with an elastic element inside, which buffers the impact load generated during the concrete pouring process through the elastic deformation of the elastic element. The bidirectional limiting rebar positioning mechanism is provided with a bidirectional limiting slot at the top, which forms a bidirectional limiting constraint on the high-strength rebar in both the horizontal and vertical directions.

2. The self-locking anti-settlement positioning support device for high-strength steel reinforcement construction according to claim 1, characterized in that: The elastic buffer anti-settlement mechanism includes a lower connecting plate, an upper connecting plate, a limiting sleeve, and a buffer spring. The upper connecting plate and the lower connecting plate are arranged in parallel. The limiting sleeve is fixedly connected between the upper connecting plate and the lower connecting plate. The buffer spring constitutes the elastic element and is installed inside the limiting sleeve. The bottom of the buffer spring abuts against the lower connecting plate. The upper end of the adjusting screw is a smooth stepped shaft, and the smooth stepped shaft is fixedly connected to the bottom center position of the lower connecting plate.

3. The self-locking anti-settlement positioning support device for high-strength steel reinforcement construction according to claim 2, characterized in that: The bidirectional limiting rebar positioning mechanism includes a top support plate and a bidirectional limiting slot disposed on the top support plate. The bottom of the top support plate is fixedly connected to the top of the buffer spring through a central shaft passing through the upper connecting plate.

4. The self-locking anti-settlement positioning support device for high-strength steel reinforcement construction according to claim 3, characterized in that: The bidirectional limiting slot includes two sets of oppositely arranged locking plates. Each set of locking plates has a slot in the middle along the vertical direction. The bottom of the slot has an arc-shaped groove surface that matches the outer circumference of the reinforcing bar. The bidirectional limiting slot forms a bidirectional limiting constraint in both the horizontal and vertical directions for the high-strength reinforcing bar placed therein.

5. The self-locking anti-settlement positioning support device for high-strength steel reinforcement construction according to claim 4, characterized in that: The bidirectional limiting slot is a detachable and replaceable structure. By replacing the slot plates with different slot sizes, it can accommodate high-strength steel bars of different diameters.

6. The self-locking anti-settlement positioning support device for high-strength steel reinforcement construction according to claim 1, characterized in that: The bottom stabilizing support mechanism, the height adjustment mechanism, the elastic buffer anti-settlement mechanism, and the bidirectional limiting rebar positioning mechanism are coaxially arranged.

7. The self-locking anti-settlement positioning support device for high-strength steel reinforcement construction according to claim 1, characterized in that: The bottom stabilizing support mechanism includes a support base plate and a connecting sleeve disposed above the support base plate. The support base plate adopts a plate-shaped structure to increase the contact area between the device and the template. The lower end of the adjusting screw is provided with an external thread, and the inner hole of the connecting sleeve is provided with an internal thread. The lower end of the adjusting screw is threadedly connected to the connecting sleeve.

8. A method for using a self-locking anti-settlement positioning support device for high-strength steel reinforcement construction, characterized in that, The device is a self-locking anti-settlement positioning support device for high-strength steel reinforcement construction as described in any one of claims 1 to 7, and the method of use includes the following steps: Step 1: Determine the design elevation of the steel mesh according to the structural design drawings, and arrange the self-locking anti-settlement positioning support device above the formwork according to the design spacing; Step 2: By rotating the adjusting nut, the adjusting screw is moved to the design elevation position, which is driven by the elastic buffer anti-settlement mechanism and the bidirectional limiting steel bar positioning mechanism. The adjusting height is then mechanically locked and fixed by the locking assembly. Step 3: Place the high-strength steel bar into the bidirectional limiting slot, and the bidirectional limiting slot forms a bidirectional limiting constraint on the steel bar in both the horizontal and vertical directions; Step 4: Concrete pouring. The elastic buffer anti-settlement mechanism absorbs the impact load of concrete through elastic deformation. The bottom stabilizing support mechanism keeps the device stable through the contact between the support base plate and the formwork, so that the high-strength steel bars maintain the designed position during the pouring process.

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