A positioning reinforcement cage angle bar and controlling protective layer fastening type cushion block

Abstract

This invention discloses a locking block for positioning the corner reinforcement of a reinforcing cage and controlling the protective layer, relating to the field of reinforcement installation technology for cast-in-place concrete components. It includes a block body and a hook-head screw. The block body has a threaded hole, and the hook-head screw includes a threaded section and an arc-shaped hook section. One end of the threaded section is connected to the threaded hole, and the other end is connected to the front end of the arc-shaped hook section. The end of the arc-shaped hook section has a bent portion. This invention uses an arc-shaped block combined with a hook-head screw to form a locking block, which has a simple structure, is easy to install on-site, and provides reliable fixation. It can accurately measure the protective layer thickness to the millimeter, ensuring the precision of reinforcement installation, promoting the safety of reinforced concrete structures, and simplifying construction procedures while improving work efficiency.

Description

Technical Field

[0001] This invention relates to the field of steel reinforcement installation technology for cast-in-place concrete components, specifically to a positioning steel cage corner reinforcement and a tightening pad for controlling the protective layer. Background Technology

[0002] In various industrial and civil buildings, the installation of reinforcing steel bars in cast-in-place frame and frame-shear wall structures, including columns, beams, and shear walls, requires structural integrity testing of representative parts related to concrete structural safety, with the thickness of the concrete cover being a crucial component. The concrete cover thickness affects the load-bearing capacity, durability, seismic resistance, and fire resistance of the concrete structure, making it a vital indicator in structural integrity testing. The concrete cover thickness is calculated based on the outer edge of the outermost layer of reinforcing bars (including stirrups, structural reinforcement, and distribution reinforcement). The accuracy of the cover thickness depends on the reinforcement binding and installation process. Currently, the common practice in on-site reinforcement construction to control the concrete cover of stirrups in cast-in-place components is to bind mortar spacers, marble spacers, or plastic spacers to the outside of the stirrups. The concrete cover for the main reinforcing bars is generally fixed by binding the intersection of the stirrups and the main reinforcing bars, and in some on-site projects, spacer frames, ladder-like reinforcement, and other measures are used to constrain the position of the main reinforcing bars.

[0003] Because rebar installation is a concealed project, quality problems such as rebar cage deformation and excessive protective layer thickness frequently occur during construction due to factors such as dimensional deviations in rebar fabrication, inadequate consideration of rebar positioning, loose rebar cage binding, inadequate protective layer spacers, and worker trampling. Using control techniques such as spacer frames and ladder-style reinforcement consumes a large amount of reinforcement and is not commonly used on-site. Deviations in protective layer thickness are difficult to detect after concrete pouring, but they directly affect the structural performance. Especially at the corners of cast-in-place components, due to improper and insecure binding of stirrups to main bars, and the difficulty in fixing conventional mortar, marble, or plastic spacers, common quality defects include misalignment of main bars at corners and excessive or insufficient protective layer thickness. Even if the protective layer spacers are correctly positioned before concrete pouring, the impact of vibrators and concrete compression can cause the spacers to shift or fall off, which is difficult to detect during concrete pouring, leading to rebar displacement or loosening of the rebar cage and uncontrolled protective layer thickness. If the protective layer is too thin, it will directly affect the durability of the component, causing cracks along the longitudinal reinforcement, leading to premature rusting and accelerated corrosion. If the protective layer is too thick, it will weaken the load-bearing capacity of the component, and the surface of the component will be prone to large shrinkage cracks and temperature cracks, which will have a great impact on the quality of the project and may even become a hidden danger of engineering accidents.

[0004] Currently, there is a lack of economical and reasonable effective technological measures that can accurately control the position of the main reinforcing bars at the corners of the steel cage and the thickness of the protective layer. This has caused a large number of potential safety hazards to the quality of the project and is not conducive to the mainstream trend of high-quality development in the modern construction industry. Summary of the Invention

[0005] The main objective of this invention is to provide a clamping pad for positioning the corner bars of the reinforcing cage and controlling the protective layer, so as to solve the technical problems existing in the prior art.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] A type of clamping pad for positioning the corner reinforcement of a steel cage and controlling the protective layer includes a pad body and a hook screw. The pad body is provided with a threaded hole. The hook screw includes a threaded section and an arc hook section. One end of the threaded section is connected to the threaded hole, and the other end is connected to the front end of the arc hook section. The end of the arc hook section is provided with a bent portion.

[0008] Furthermore, the pad body adopts an arc-shaped structure, and the arc-shaped inner sidewall of the pad body is closely attached to the outer sidewall at the corner of the stirrup.

[0009] Furthermore, the thickness of the pad block body is the same as the designed thickness of the reinforcing bar protective layer.

[0010] Furthermore, the threaded section, the arc hook section, and the bent portion are integrally formed structures.

[0011] Furthermore, during construction, the threaded section of the hook-head screw is first screwed into the threaded hole of the spacer body to a depth of half the design thickness of the concrete cover of the reinforcing steel, forming a fixed spacer. Then, the spacer body is held against the outside of the stirrup at the corner, and the arc-shaped hook section of the hook-head screw hooks the corner main reinforcement along the bottom of the stirrup, and after passing around the corner main reinforcement, the bent part at the end of the arc-shaped hook section hooks the adjacent stirrup. Then, the spacer body is rotated clockwise, and the hook-head screw and the spacer body are tightened into place by thread locking, so that the hook-head screw hooks both the corner main reinforcement and the stirrup, and the arc-shaped inner side of the spacer body presses against the outside of the stirrup. The corner reinforcement, stirrup, and spacer body together form a fixed structure through the hook-head screw, accurately and firmly positioning the corner main reinforcement. Then, the fixed spacers at the remaining corners of the stirrup are installed in the same way, thus initially fixing the reinforcing steel skeleton.

[0012] Furthermore, before installing the pads, first clean the structural base layer, distribute and connect the main reinforcing bars of the components, then mark the lines on the main reinforcing bars according to the stirrup spacing, and then distribute the stirrups according to the marked spacing.

[0013] Furthermore, the arc-shaped outer wall of the pad body is provided with multiple grooves, and a ball bearing is rotatably disposed on the groove. Part of the ball bearing is located inside the groove, and another part extends to the outside of the pad body through the opening of the groove. The sum of the thickness of the part of the ball bearing protruding from the pad body and the thickness of the pad body is the design thickness of the steel reinforcement protective layer.

[0014] Furthermore, a spring is fixedly installed in the groove, and a support plate is fixedly installed at the free end of the spring. The support plate is slidably installed in the groove, and the ball bearing is rotatably mounted on the support plate.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] This invention uses an arc-shaped pad and a hook-shaped screw to form a fixed pad, which has a simple structure, is easy to install on site, and is reliable in fixing. It can make the protective layer thickness accurate to the millimeter, ensure the installation accuracy of the steel bars, promote the safety of the reinforced concrete structure, and at the same time simplify the construction process and improve work efficiency.

[0017] Furthermore, the clamping pad of this invention replaces the traditional wire binding process in the connection method between the corner main reinforcement and the stirrups; it replaces the previous binding and fixing or spacing frame, ladder reinforcement and other control processes in the positioning measures of the corner main reinforcement; and it replaces conventional mortar pads, marble pads or ordinary plastic pads in the method of controlling the thickness of the reinforcement protective layer. It solves the common quality defects in current concealed reinforcement projects, such as skeleton deformation, corner main reinforcement misalignment, and excessive reinforcement protective layer thickness, effectively preventing engineering accident hazards caused by excessively thin or thick reinforcement protective layers, and improving the overall quality of reinforcement installation projects. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the fixed pad block after installation according to the present invention.

[0019] Figure 2 This is a schematic diagram of the pad body structure of the present invention.

[0020] Figure 3 This is a schematic diagram of the hook screw structure of the present invention.

[0021] Figure 4 This is a side view of the present invention after the installation of the clamping pad when there is no hook at the stirrup.

[0022] Figure 5 This is a top view of the installation of the clamping pad when there are no hooks at the stirrups of the present invention.

[0023] Figure 6 This is a side view of the hoop with hooks installed after installing the clamping pad.

[0024] Figure 7 This is a top view of the hoop with hooks installed after installing the clamping pad.

[0025] Figure 8 for Figure 1 A magnified view of a portion of point A in the middle.

[0026] Figure 9 This is a schematic diagram of the pad body and the ball bearings after assembly according to the present invention.

[0027] Among them, 1-pad body, 11-threaded hole, 2-hook screw, 21-threaded section, 22-circular arc hook section, 23-bent part, 3-corner rib, 4-stirrup, 5-hook, 6-ball bearing. Detailed Implementation

[0028] The technical solution of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0029] Example 1

[0030] like Figures 1 to 8 As shown, this embodiment provides a locking pad for positioning the corner bars of a steel cage and controlling the protective layer, including a pad body 1 and a hook screw 2. The pad body 1 is provided with a threaded hole 11. The hook screw 2 includes a threaded section 21 and an arc hook section 22. One end of the threaded section 21 is connected to the threaded hole 11, and the other end is connected to the front end of the arc hook section 22. The end of the arc hook section 22 is provided with a bent portion 23.

[0031] In this embodiment, the corner reinforcement 3 refers to the main corner reinforcement, which is the main load-bearing reinforcement.

[0032] In this embodiment, the pad body 1 adopts an arc-shaped structure, and the arc-shaped inner sidewall of the pad body 1 is closely attached to the outer sidewall at the corner of the stirrup 4.

[0033] In this embodiment, the threaded section 21, the arc hook section 22, and the bent portion 23 are integrally formed structures.

[0034] The arc-shaped pad body 1 is manufactured by a professional manufacturer using high-polymer technology, and its thickness is the same as the designed protective layer thickness of the reinforcing steel. The hook screw 2 is an M4 hook screw, which serves as a tightening device and can be processed on-site or manufactured in a factory. The combination of the arc-shaped pad and the hook screw 2 forms a tightening pad, which has a simple structure, low cost, and is especially suitable for mass production in a factory.

[0035] The tightening spacer block of this embodiment can accurately measure the thickness of the steel reinforcement protective layer to the millimeter, ensuring the precision of steel reinforcement installation, promoting the safety of reinforced concrete engineering structures, simplifying construction procedures, improving work efficiency, and having good promotional value. It solves the common quality defects in current concealed steel reinforcement projects, such as skeleton deformation, corner main reinforcement misalignment, and excessive steel reinforcement protective layer thickness, effectively preventing engineering accident hazards caused by excessively thin or thick steel reinforcement protective layers, overcoming the misconception that traditional thinking does not pay enough attention to steel reinforcement protective layers, and improving the overall quality of steel reinforcement installation projects.

[0036] Example 2

[0037] The difference between this embodiment and Embodiment 1 lies in the specific structure of the pad body 1.

[0038] Combination Figure 9 As shown in this embodiment, the arc-shaped outer wall of the pad body 1 is provided with a plurality of grooves, and a ball bearing 6 is rotatably disposed on the groove. Part of the ball bearing is located inside the groove, and the other part extends to the outside of the pad body 1 through the opening of the groove. The sum of the thickness of the part of the ball bearing protruding from the pad body 1 and the thickness of the pad body 1 is the design thickness of the steel reinforcement protective layer.

[0039] After the reinforcing cage is tied and formed, it needs to be placed into the pile hole in the next step. During the process of the reinforcing cage falling into the pile hole, its outermost pad body 1 will rub against the inner wall of the pile hole. The sliding friction between the two may cause the pad body 1 to shift, resulting in the problem of the reinforcing steel protective layer being too thin or too thick. In this embodiment, by installing ball bearings 6 on the arc-shaped outer wall of the pad body 1, the ball bearings 6 will rotate during the falling process of the reinforcing cage, changing the sliding friction between the pad body 1 and the inner wall of the pile hole into rolling friction, reducing friction and avoiding the problem of the pad body 1 shifting.

[0040] Preferably, a spring is fixedly disposed in the groove, and a support plate is fixedly disposed at the free end of the spring. The support plate is slidably disposed in the groove, and the ball bearing is rotatably mounted on the support plate.

[0041] Example 3

[0042] This embodiment provides a construction method for a clamping pad, including the following steps:

[0043] Measure and mark the lines → Clean the base layer → Distribute and connect the longitudinal bars → Distribute the stirrups 4 → Install the clamping blocks → Tie the remaining bars → Form the steel reinforcement cage → Quality acceptance.

[0044] The specific steps are as follows:

[0045] 1. Measure the chalk line

[0046] Based on the building's positioning axis, mark out the formwork position lines and control lines for the cast-in-place components, use an ink line to mark the lines, and mark them with red paint. Measure the +500mm horizontal elevation control point as the basis for controlling the top elevation of the cast-in-place components.

[0047] 2. Clean up the grassroots level

[0048] For vertical components, the top surface of the base layer should be cleaned, roughened manually until all the stones are exposed, and then rinsed clean. For horizontal components, the supports and bottom formwork should be level and firm, and surface debris should be removed.

[0049] 3. Distribute and connect longitudinal reinforcement bars (main reinforcing bars).

[0050] The longitudinal reinforcement bars of columns and walls are spliced ​​one by one. The steel bar joints can be mechanically connected, welded or tied according to the design requirements. The longitudinal reinforcement bars of the main beams and secondary beams are distributed in coordination. The longitudinal reinforcement bars of the secondary beams are supported on the longitudinal reinforcement bars of the main beams. The steel bar joints are mechanically connected. The longitudinal reinforcement bars at both ends of the joint are aligned with the axis and screwed into the connecting sleeve and tightened with a torque wrench.

[0051] 4. Distribution stirrups 4

[0052] Draw the spacing lines of stirrups 4 on the longitudinal reinforcement, and then distribute the pre-fitted stirrups 4 according to the design spacing. Start setting the initial stirrups 4 50mm from the edge of the component. The spacing of stirrups 4 in the dense and non-dense areas is arranged according to the design requirements. At the junction of the main and secondary beams, add stirrups 4 at a spacing of 50mm along the main beam, with a total of 3 on each side. The overlapping points of the hooks 5 on the stirrups 4 are arranged alternately along the longitudinal reinforcement of the component.

[0053] 5. Install the locking pads.

[0054] First, screw the threaded section 21 of the hook screw 2 into the threaded hole 11 of the pad body 1, with the screwing depth being half the design thickness of the steel reinforcement protective layer, to assemble a locking pad. Then, hold the pad body 1 and place it against the outside of the stirrup 4 at the corner. Hook the arc-shaped hook section 22 of the hook screw 2 along the bottom of the stirrup 4 to hook the corner main reinforcement of the component, and after passing around the corner main reinforcement, hook the bent part 23 at the end of the arc-shaped hook section 22 to hook the adjacent stirrup 4. Then, rotate the pad body 1 clockwise to lock the hook screw 2 and the pad body 1 into place through the threaded locking mechanism. The hook screw 2 simultaneously hooks onto the corner main reinforcement and the stirrup 4, and the inner arc of the pad body 1 presses tightly against the outer side of the stirrup 4. The corner reinforcement, the stirrup 4, and the pad body 1 together form a tightening structure through the hook screw 2, accurately and firmly positioning the corner main reinforcement. Finally, the tightening pads at the remaining corners of the stirrup 4 are installed in the same way to accurately and firmly position the corner main reinforcement, while ensuring that the thickness of the concrete cover is consistent with the design. Subsequently, the tightening pads at the remaining corners of the stirrup 4 are installed in the same way to initially fix the reinforcement skeleton.

[0055] 6. Tie the remaining reinforcing bars.

[0056] The remaining stirrups 4 are tied to the intersections of the main reinforcing bars using conventional methods. The longitudinal bars of the walls and columns are perpendicular to the stirrups 4 and are tied from top to bottom using a wrapping method, with the ties facing the center of the component. The longitudinal bars of the beams are tied to the stirrups 4 using a loop method, with the ties facing the inside of the component. The waist bars on both sides of the beam are hooked with tie bars. The straight bars and spacing of the tie bars meet the design requirements. Additional hanging bars are set inside the main beams on both sides of the secondary beam at the junction of the main and secondary beams.

[0057] 7. After the steel cage is tied and formed, install the protective layer spacers on the flat and vertical surfaces of the component. The spacers at the bottom of the component are spaced 600mm apart, and the spacers on the sides are spaced 800mm apart, arranged in a quincunx pattern.

[0058] 8. Quality Acceptance

[0059] After the installed cast-in-place steel reinforcement cage passes quality inspection, it proceeds to the next process.

[0060] The process described in this embodiment utilizes a simple combination of an arc-shaped pad body 1 and an M4 hook screw 2 to replace the traditional wire binding process in the connection between the main reinforcement and the stirrups 4; it replaces the previous binding and fixing or spacing frame, ladder reinforcement, and other control processes in the positioning of the corner main reinforcement; and it replaces the conventional mortar pads, marble pads, or ordinary plastic pads in the method of controlling the thickness of the reinforcement protective layer. This solves the common quality defects in current concealed reinforcement works, such as skeleton deformation, corner main reinforcement misalignment, and excessive reinforcement protective layer thickness. It effectively prevents engineering accidents caused by excessively thin or thick reinforcement protective layers, overcomes the misconception that traditional thinking does not pay enough attention to the reinforcement protective layer, and improves the overall quality of reinforcement installation projects.

[0061] The above description is merely a preferred embodiment of the present invention and does not constitute any limitation on the technical scope of the present invention. Therefore, any minor modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A type of clamping pad for positioning the corner bars of a reinforcing cage and controlling the protective layer, characterized in that, The device includes a pad body and a hook screw. The pad body has a threaded hole. The hook screw includes a threaded section and an arc hook section. One end of the threaded section is connected to the threaded hole, and the other end is connected to the front end of the arc hook section. The end of the arc hook section has a bent portion. During construction, first screw the threaded section of the hook bolt into the threaded hole of the spacer body to a depth of half the design thickness of the concrete cover of the reinforcing bar, thus assembling a fixed spacer. Then, hold the spacer body against the outside of the stirrup at the corner, hook the arc hook section of the hook bolt along the bottom of the stirrup to hook the corner main reinforcement of the component, and after passing around the corner main reinforcement, hook the bent part at the end of the arc hook section to hook the adjacent stirrup. Then rotate the spacer body clockwise, and tighten the hook bolt and the spacer body into place by thread locking, so that the hook bolt hooks the corner main reinforcement and the stirrup at the same time, and the arc inner side of the spacer body presses against the outside of the stirrup. The corner reinforcement, stirrup and spacer body together form a fixed structure through the hook bolt, accurately and firmly positioning the corner main reinforcement. Then, install the fixed spacers at the other corners of the stirrup in the same way, thus initially fixing them into a reinforcing bar skeleton. The arc-shaped outer wall of the pad block body is provided with multiple grooves, and a ball bearing is rotatably disposed on the groove. Part of the ball bearing is located inside the groove, and another part extends to the outside of the pad block body through the opening of the groove. The sum of the thickness of the part of the ball bearing protruding from the pad block body and the thickness of the pad block body is the design thickness of the steel reinforcement protective layer.

2. The positioning steel cage corner reinforcement and control protective layer clamping pad as described in claim 1, characterized in that, The pad block body adopts an arc-shaped structure, and the arc-shaped inner sidewall of the pad block body is closely attached to the outer sidewall of the stirrup corner.

3. The positioning steel cage corner reinforcement and control protective layer clamping pad as described in claim 2, characterized in that, The thickness of the pad block body is the same as the design thickness of the steel reinforcement protective layer.

4. The positioning steel cage corner reinforcement and control protective layer clamping pad as described in claim 1, characterized in that, The threaded section, the arc hook section, and the bent part are integrally formed structures.

5. A positioning steel cage corner reinforcement and control protective layer clamping pad as described in claim 1, characterized in that, Before installing the spacers, first clean the structural base layer, distribute and connect the main reinforcing bars of the components, then mark the main reinforcing bars with lines according to the stirrup spacing, and then distribute the stirrups according to the marked spacing.

6. The positioning steel cage corner reinforcement and control protective layer clamping pad as described in claim 1, characterized in that, A spring is fixedly installed in the groove, and a support plate is fixedly installed at the free end of the spring. The support plate is slidably installed in the groove, and the ball bearing is rotatably mounted on the support plate.

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