Gravity self-balancing concrete protection layer cushion

Abstract

The utility model relates to the civil engineering construction technical field, concretely points to a gravity self -balancing concrete protective layer cushion block. Including concrete cushion block and wedge, the concrete cushion block is round open block structure, and the concrete cushion block is seted up with the bayonet; The bayonet is the recess structure that one end opens, and the other end extends to the concave core place of concrete cushion block along the radial direction, the wedge is the block structure that inserts the bayonet and fixes concrete cushion block on horizontal reinforcement, and the bayonet inserts the through -hole that the bayonet inserts the bayonet and forms the through -hole that horizontal reinforcement passes -through in the concave core position of concrete cushion block, the concrete cushion block forms the ring -shaped closed block structure with the wedge after the wedge inserts the bayonet, and the center of gravity does not coincide with the ring -shaped closed block structure. The cushion block structure simple of the application, through the arrangement that the center of gravity of cushion block does not coincide with the concave core, makes the cushion block have the self -balancing function, can restore to the initial position automatically when the construction appears the disturbance, effectively reduces the position deviation, ensures the accuracy of protective layer thickness.

Description

Technical Field

[0001] This utility model relates to the field of civil engineering construction technology, specifically to a gravity self-balancing concrete protective layer pad block. Background Technology

[0002] The concrete cover thickness refers to the distance from the outermost edge of the outermost reinforcing bars (including stirrups, structural bars, distribution bars, etc.) to the concrete surface, used to ensure the durability and bond anchorage performance of the reinforcing bars. The Code for Design of Concrete Structures GB50010-2010 (2015 edition) stipulates the minimum cover thickness according to environmental conditions and environmental categories.

[0003] The "Code for Construction of Concrete Structures" GB50666-2011 stipulates that special spacers (such as cement mortar spacers, plastic clips, etc.) should be used to control the thickness of the protective layer during construction. The spacing between spacers is: ≤500mm for slabs and walls; ≤800mm for beams and columns. The strength of the spacers shall not be lower than the strength grade of the structural concrete.

[0004] Reinforced concrete structures, as the most common structural type in building engineering, rely on the excellent stress-bearing synergy between concrete and reinforcing steel to achieve a stable bond. Precisely controlling the thickness of the concrete cover is crucial for ensuring the durability and fire resistance of the concrete, as well as the corrosion resistance of the reinforcing steel. Currently, cement mortar spacers or plastic retainers are commonly used to control the cover thickness in engineering projects. However, these methods suffer from problems such as complex construction processes, cumbersome operation, poor stability, susceptibility to displacement and rotation, and poor bonding with concrete. Therefore, the spacer structure should be further improved to enhance its construction stability and adaptability.

[0005] For steel bars directly supported on horizontal formwork, spacers can be placed on the formwork to ensure the thickness of the concrete cover; however, for steel bars in walls, columns, and beams that are close to the lateral formwork, the thickness of the concrete cover cannot be directly controlled by using spacers.

[0006] One current method involves pre-embedding iron wires within cement mortar blocks, or threading the wires through them after they have been formed, and then binding the wires to the reinforcing bars. This method is not only cumbersome and inefficient, but the bound mortar blocks are also prone to slipping and rotating due to insecure binding or the influence of gravity. When the blocks are subjected to vibration or impact, they may twist or even detach, thus losing their function of controlling the thickness of the protective layer. Another method uses plastic rings. While this method avoids the impact of ring rotation on the thickness of the reinforcing bar protective layer, it has significant drawbacks: if the plastic has low strength, the rings are easily deformed; if the strength is high, it lacks elasticity and is difficult to hold the reinforcing bars in place. Furthermore, the elastic modulus and coefficient of thermal expansion of plastic differ significantly from concrete, resulting in poor adhesion to the subsequently poured concrete and making it easy for corrosive media to penetrate, leading to corrosion of the reinforcing bars within the rings. Utility Model Content

[0007] The purpose of this application is to address the shortcomings of the aforementioned background technology and provide a gravity-self-balancing concrete protective layer pad block.

[0008] The technical solution of this application is: a gravity-self-balancing concrete protective layer pad block, comprising, A concrete pad block, wherein the concrete pad block is a circular open block structure, and a snap-fit ​​is provided on the concrete pad block; the snap-fit ​​is a groove structure with one end open and the other end extending radially to the center of the concrete pad block. The wedge is a block-shaped structure that is inserted into a slot to fix a concrete pad to a horizontal reinforcing bar. The wedge is inserted into a slot to form a through hole through which the horizontal reinforcing bar passes at the center of the concrete pad. After the wedge is inserted into the slot, the concrete pad block forms a closed annular block structure with the wedge block, whose center of gravity does not coincide with the center of the circle.

[0009] According to the present application, a gravity self-balancing concrete protective layer pad block is provided, wherein after the wedge is inserted into the slot, the concrete pad block forms a closed annular block structure with the center of gravity located on the side where the wedge is installed.

[0010] According to the gravity self-balancing concrete protective layer pad provided in this application, the wedge is a trapezoidal block structure with a smaller end near the horizontal reinforcing bar and a larger end away from the horizontal reinforcing bar.

[0011] According to the gravity self-balancing concrete protective layer pad provided in this application, the wedge is an inverted trapezoidal block structure with a larger end near the horizontal reinforcing bar and a smaller end away from the horizontal reinforcing bar.

[0012] According to the present application, a gravity self-balancing concrete protective layer pad is provided, wherein the concrete pad is provided with counterweight areas on both sides of the slot so that the center of gravity of the concrete pad does not coincide with the center of the circle.

[0013] According to the gravity self-balancing concrete protective layer pad provided in this application, the counterweight area is either a thickened area with increased axial thickness or a high-density area with high-density inserts installed in the area.

[0014] According to the present application, a gravity self-balancing concrete protective layer pad block is provided, wherein the wedge block is a counterweight block with a density greater than that of the concrete pad block and a lighter end near the horizontal reinforcing bar and a heavier end away from the horizontal reinforcing bar.

[0015] According to the present application, a gravity-balanced concrete protective layer pad is provided with a groove for weight reduction on the side of the concrete pad opposite to the bayonet.

[0016] The advantages of this application are: 1. The pad block structure of this application is simple and easy to install. The center of gravity of the pad block does not coincide with the center of the circle. When the pad block is installed on the horizontal reinforcement, it can automatically adjust to the initial state under the action of gravity. The outer circumference of the pad block is tightly pressed against the template, forming the width required for the concrete protective layer between the template and the horizontal reinforcement. When the pad block is subjected to construction disturbances such as vibration and collision, the pad block can recover to the initial position as much as possible by relying on the support force of the template, the support force of the horizontal reinforcement and the torque generated by the center of gravity, reducing positional deviation and ensuring the accuracy of the concrete protective layer thickness. 2. The wedge installation method of this application is very simple. By inserting the wedge, the center of gravity is shifted to the side where the wedge is installed. In actual use, the wedge installation position is always below the horizontal reinforcement, avoiding the wedge part from contacting the formwork. It is always supported by the concrete pad between the formwork and the horizontal reinforcement, which improves the accuracy and stability of the protective layer thickness pouring. 3. The wedge structure of this application is simple. By setting the inverted trapezoidal wedge structure, it can be easily installed into the bayonet and the concrete pad can be stably fixed to the horizontal steel bar. The installation method is simple and the stability is excellent. 4. The wedge block of this application has a trapezoidal structure, which is convenient for installation and manufacturing, and the resulting structure of being smaller at the top and larger at the bottom facilitates the control of the center of gravity of the pad block. 5. This application sets counterweight areas on both sides of the snap-fit ​​on the concrete pad, which is simple in structure, easy to manufacture, and the center of gravity of the formed pad is located on the side where the snap-fit ​​is installed, resulting in excellent structural stability. 6. This application controls and adjusts the center of gravity by thickening or adding inserts, resulting in a simple structure and easy manufacturing; 7. This application uses wedges as counterweights, which has a simple structure, is easy to install and manufacture, and results in a more stable pad structure. 8. This application further facilitates the control of the center of gravity by setting a weight-reducing groove on the concrete pad, causing the center of gravity of the pad to shift towards the locking side, thereby improving the stability of installation and use.

[0017] This application lowers the center of gravity of the pad block by adding weight, grooves, and wedges, enhancing its anti-overturning ability. It automatically returns to its correct position after vibration, keeping the opening facing downwards. During construction, the pad block maintains a stable posture, and the protective layer thickness does not deviate significantly due to disturbance. The thickness of the annular pad block is the same as the protective layer thickness of the reinforcing steel. Different diameter reinforcing steels, after being pressed against the formwork, will achieve the protective layer thickness set by the pad block itself. No binding is required, installation is convenient, and it can be directly clipped onto horizontal reinforcing steel, improving construction efficiency. It is suitable for standardized mass production, simple to manufacture, and can be designed in different specifications and sizes, facilitating molded and industrialized production, and adapting to various reinforcing steel specifications and formwork types. The same specification pad block can be used for reinforcing steels with diameters less than 3mm of the clamp opening. This application's pad block is suitable for horizontal reinforcing steel and applicable to controlling the protective layer thickness on the side of structural members. Under gravity, the opening of this application's pad block remains downwards, preventing reinforcing steel from falling off. This application's pad block is made of the same material as concrete, resulting in a mortar pad block with no color difference, suitable for components cast with fair-faced concrete. It is low in cost and has good adhesion to concrete.

[0018] The pad structure of this application is simple. By arranging the pads so that their center of gravity does not coincide with the center of the circle, the pads have a self-balancing function. When disturbance occurs during construction, they can automatically return to their initial position, effectively reducing positional deviation and ensuring the accuracy of the protective layer thickness. Attached Figure Description

[0019] Figure 1 This application provides a schematic diagram of the installation of a wedge and a concrete pad (complete installation). Figure 2 : A schematic diagram of the installation of a wedge and a concrete pad (to be installed) according to this application; Figure 3 Another schematic diagram of the installation of the wedge and concrete pad in this application (complete installation); Figure 4 Another schematic diagram of the installation of the wedge and concrete pad (to be installed) in this application; Figure 5 Top view of the pad block in this application; Wherein: 1—concrete pad; 2—jamming slot; 3—counterweight area; 4—groove; 5—wedge; 11—Horizontal reinforcement bars; 12—Formwork. Detailed Implementation

[0020] The embodiments of this application are described in detail below, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0021] In the description of this application, it should be understood that the terms "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0022] 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 one or more of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0023] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0024] This application relates to a concrete protective layer spacer structure. The spacer is a block-shaped structure that is directly snapped onto the horizontal reinforcing bars, making installation very convenient. It can be stably fixed to the horizontal reinforcing bars without the need for binding, greatly improving construction efficiency. Moreover, the spacer is a self-balancing structure, with its center of gravity not coinciding with the center of a circle. After being installed on the horizontal reinforcing bars, the spacer can automatically return to its initial position under the action of gravity. During construction, even if the position changes due to disturbance, it can quickly return to its original position, greatly reducing positional deviation and ensuring the accuracy of the concrete protective layer thickness, thus improving both construction efficiency and accuracy.

[0025] Specifically, such as Figures 1-5 As shown, a gravity-balanced concrete protective layer pad of this application includes a concrete pad 1 and a wedge 5. The concrete pad 1 is a circular open block structure with a notch 2. The notch 2 is a groove 4 structure with one end open and the other end extending radially to the center of the concrete pad 1. The wedge 5 is a block structure that is inserted into the notch 2 to fix the concrete pad 1 to the horizontal reinforcing bar 11. The wedge 5, when inserted into the notch 2, forms a through hole through which the horizontal reinforcing bar 11 passes at the center of the concrete pad 1. After the wedge 5 is inserted into the notch 2, the concrete pad 1 and the wedge 5 form a closed annular block structure with the center of gravity not coinciding with the center of the circle. After the wedge 5 is inserted into the notch 2, the concrete pad 1 forms an annular pad that fits onto the horizontal reinforcing bar 11. The diameter of the inner circle of the annular pad, i.e., the through hole formed by the concrete pad 1 and the wedge 5, is larger than the diameter of the horizontal reinforcing bar 11. After the pad is assembled onto the horizontal reinforcing bar 11, it can rotate around the axis of the horizontal reinforcing bar 11.

[0026] During actual construction, after the horizontal reinforcing bar 11 and formwork 12 are installed in place, align the opening side of the slot 2 on the concrete pad 1 with the horizontal reinforcing bar 11, move the concrete pad 1 so that the bottom side of the slot 2 is pressed against the outer circumference of the horizontal reinforcing bar 11, insert the wedge 5 into the slot 2, and press the end of the wedge 5 closest to the horizontal reinforcing bar 11 against the outer circumference of the horizontal reinforcing bar 11, so that the horizontal reinforcing bar 11 is confined in the circular through hole formed by the slot 2 and the wedge 5, and the axis of the horizontal reinforcing bar 11 coincides with the center of the concrete pad 1; the wedge 5 After installation, the concrete pad 1 is released. Under the action of gravity, the pad structure formed by the concrete pad 1 and the wedge 5 rotates around the axis of the horizontal reinforcement 11 to the initial state. During use, the formwork 12 and the horizontal reinforcement 11 are disturbed, and the distance between the formwork 12 and the horizontal reinforcement 11 changes. The disturbance may cause the pad to rotate on the horizontal reinforcement 11. As long as the disturbance disappears, under the action of gravity, the pad will automatically return to the initial state where the center of gravity is below the horizontal reinforcement 11 until the protective layer is poured.

[0027] In some embodiments of this application, the above-described installation structure of the concrete pad 1 and wedge 5 has been further optimized, such as... Figures 1-4 As shown, in this embodiment, after the wedge 5 is inserted into the slot 2, the concrete pad 1 forms a closed annular block structure with the center of gravity located on the side where the wedge 5 is installed.

[0028] The center of gravity is located on the side where the wedge block 5 is installed. After the wedge block 5 is installed in the slot 2, under the action of gravity, the side with the wedge block 5 installed will automatically rotate to the bottom of the horizontal steel bar 11, and the side of the concrete pad 1 will be pressed against the template 12, thus automatically completing the installation of the concrete pad 1. Even if there is a disturbance later, the concrete pad 1 will be displaced due to the disturbance, but as long as the disturbance disappears, under the action of gravity, the concrete pad 1 and the wedge block 5 will automatically return to their initial positions.

[0029] Furthermore, to ensure that the center of gravity of the assembled concrete pad 1 and wedge 5 is lower, in this embodiment, the wedge 5 is a counterweight block with a density greater than that of the concrete pad 1, lighter at the end near the horizontal reinforcing bar 11 and heavier at the end away from the horizontal reinforcing bar 11. The weight of the wedge 5 is greater than the weight of a block of the same volume with the same density as the concrete pad 1. In other words, the concrete pad 1 in this embodiment is a homogeneous concrete block structure, while the wedge 5 is a heterogeneous block with a lower density and lighter weight near the horizontal reinforcing bar 11 and a higher density and heavier weight at the end away from the horizontal reinforcing bar 11. Because the wedge 5 is lighter at the top and heavier at the bottom, when the wedge 5 is assembled into the slot 2, the slot part will be unbalanced with the other parts of the concrete pad 1. The slot part is lighter at the top and heavier at the bottom. This is reflected in the assembled concrete pad 1 and wedge 5, where the center of gravity is located in the overlapping part of the wedge 5. That is to say, the center of gravity of the pad formed by the concrete pad 1 and the wedge 5 is on the wedge 5. A more optimized option is to place the center of gravity of the pad formed by the concrete pad 1 and the wedge 5 in the lower half of the wedge 5, so that the pad can quickly return to its original position after being disturbed.

[0030] In other embodiments of this application, the wedge block 5 structure described above has been optimized, specifically, as follows: Figures 1-2 As shown, wedge 5 is a trapezoidal block structure with a smaller end near the horizontal reinforcing bar 11 and a larger end away from the horizontal reinforcing bar 11. Wedge 5 has a trapezoidal or triangular structure (based on the orientation of the concrete pad 1 when the center of gravity of the pad formed by wedge 5 is on wedge 5 and the pad is in its initial position). This structure facilitates the installation of wedge 5 into the slot 2; wedge 5 only needs to be inserted radially into the slot 2 along the opening to complete the installation. Simultaneously, the wedge 5's smaller-than-large structure also facilitates the adjustment and arrangement of the center of gravity of the entire pad. Combined with the aforementioned top-lighter-bottom-heavier configuration, this effectively controls the center of gravity of the pad to be on the lower half of wedge 5.

[0031] This embodiment also uses another structure for the wedge block 5, such as... Figures 3-4 As shown, wedge 5 is an inverted trapezoidal block structure with one end larger than the horizontal reinforcing bar 11 and the other end smaller than the horizontal reinforcing bar 11. This type of wedge 5, with its larger top and smaller bottom structure, is an inverted trapezoidal or inverted triangular structure. During installation, the wedge 5 is aligned with the locking slot 2 along the axial direction of the horizontal reinforcing bar 11, and then axially pressed to engage the wedge 5 into the locking slot 2, completing the installation. This structure allows the wedge 5 to be stably fixed within the locking slot 2. The larger top and smaller bottom wedge 5 can self-lock within the locking slot 2, withstand non-axial disturbances, and exhibits excellent stability.

[0032] During actual installation, after the horizontal steel bar 11 and the formwork 12 are installed in place, align the opening side of the slot 2 on the concrete pad 1 with the horizontal steel bar 11, move the concrete pad 1 so that the bottom side of the slot 2 is pressed against the outer circumference of the horizontal steel bar 11. One installation method is to insert the upper end of the wedge 5 (smaller at the top and larger at the bottom) into the lower opening of the bayonet 2, and then insert the wedge 5 into the bayonet 2 along the radial direction of the concrete pad 1 until the arc-shaped groove at the upper end of the wedge 5 engages with the outer circumference of the horizontal steel bar 11, thus fixing the wedge 5 into the bayonet 2 and completing the installation of the wedge 5. Another installation method is to align the wedge block (larger at the top and smaller at the bottom) with the bayonet 2 along the axial direction, and press the wedge block 5 into the bayonet 2 along the axial direction so that the upper arc-shaped groove of the wedge block 5 fits against the lower end of the outer circumference of the horizontal steel bar 11, thus completing the installation of the wedge block 5.

[0033] In a further embodiment of this application, the above-described concrete pad block 1 structure has been optimized, specifically, as follows: Figures 1-5 As shown, the concrete pad 1 has a counterweight area 3 on both sides of the slot 2 so that the center of gravity of the concrete pad 1 does not coincide with the center of the circle.

[0034] In this embodiment, the adjustment of the center of gravity of the pad block is carried out on the concrete pad block 1. By setting counterweight areas 3 on both sides of the bayonet 2, the center of gravity of the concrete pad block 1 is changed by using the counterweight areas 3. The counterweight areas 3 make the center of gravity of the concrete pad block 1 lower. The counterweight areas 3 on both sides are symmetrically arranged with the center line of the bayonet 2 as the center, so that the center of gravity of the concrete pad block 1 is located at a position lower than the center line of the bayonet 2.

[0035] Specifically, counterweight zone 3 is either a thickened zone with increased axial thickness or a high-density zone with high-density inserts installed in that zone.

[0036] In a preferred embodiment of this application, the structure of the concrete pad 1 described above has been optimized, specifically, as follows: Figure 5 As shown, in this embodiment, the concrete pad block 1 has a groove 4 for weight reduction on the side opposite to the bayonet 2.

[0037] In this embodiment, the concrete pad 1 is lighter at the top and heavier at the bottom (when the concrete pad 1 is in its initial state). That is, the center of gravity of the pad formed by the concrete pad 1 and the wedge 5 is below the center of the circle. In addition to increasing the weight of the lower part of the pad, the center of gravity can also be adjusted by reducing the weight of the upper part of the concrete pad 1. This can be achieved by adding a groove 4 to the upper part of the concrete pad 1.

[0038] By adding a groove 4 to the upper half of the concrete pad 1 and a counterweight area 3 to the lower half, the center of gravity of the pad formed by the concrete pad 1 and the wedge block 5 can be easily adjusted so that the center of gravity is below the center of the circle.

[0039] When the gravity self-balancing concrete protective layer pad of this application is actually installed, after the horizontal steel bar 11 and the formwork 12 are installed in place, the opening side of the slot 2 on the concrete pad 1 is aligned with the horizontal steel bar 11, the concrete pad 1 is moved so that the bottom side of the slot 2 is pressed against the outer circumference of the horizontal steel bar 11, and the wedge 5 is inserted into the slot 2. One installation method is to insert the upper end of the wedge 5 (smaller at the top and larger at the bottom) into the lower opening of the bayonet 2, and then insert the wedge 5 into the bayonet 2 along the radial direction of the concrete pad 1 until the arc-shaped groove at the upper end of the wedge 5 engages with the outer circumference of the horizontal steel bar 11, thus fixing the wedge 5 into the bayonet 2 and completing the installation of the wedge 5. Another installation method is to align the wedge block (larger at the top and smaller at the bottom) with the bayonet 2 along the axial direction, and press the wedge block 5 into the bayonet 2 along the axial direction so that the upper arc-shaped groove of the wedge block 5 fits against the lower end of the outer circumference of the horizontal steel bar 11, thus completing the installation of the wedge block 5. The axis of the horizontal reinforcing bar 11 coincides with the center of the concrete pad 1. After the wedge block 5 is installed, the concrete pad 1 is released. Under the combined action of the counterweight zone 3 and the wedge block 5, the pad structure formed by the concrete pad 1 and the wedge block 5 rotates around the axis of the horizontal reinforcing bar 11 to the initial state. During use, the formwork 12 and the horizontal reinforcing bar 11 are disturbed, and the distance between the formwork 12 and the horizontal reinforcing bar 11 changes. The disturbance may cause the pad to rotate on the horizontal reinforcing bar 11. As long as the disturbance disappears, under the action of gravity, the pad will automatically return to the initial state where the center of gravity is below the horizontal reinforcing bar 11 until the construction of the protective layer is completed.

[0040] In the above-mentioned scheme of this application, the center of gravity of the concrete pad 1 is adjusted by the groove 4, the counterweight area 3 and the wedge 5. In actual application, the above three adjustment modes can be combined arbitrarily, as long as the center of gravity of the concrete pad 1 does not coincide with the center of the circle.

[0041] The foregoing has shown and described the basic principles, main features, and advantages of this application. Those skilled in the art should understand that this application is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this application. Various changes and modifications can be made to this application without departing from the spirit and scope thereof, and all such changes and modifications fall within the scope of this application as claimed. The scope of protection of this application is defined by the appended claims and their equivalents.

Claims

1. A gravity-balanced concrete protective layer pad, characterized in that: include, Concrete pad (1), the concrete pad (1) is a circular open block structure, and a slot (2) is provided on the concrete pad (1); the slot (2) is a groove (4) structure with one end open and the other end extending radially to the center of the concrete pad (1); The wedge (5) is a block structure that is inserted into the slot (2) to fix the concrete pad (1) on the horizontal steel bar (11). The wedge (5) is inserted into the slot (2) to form a through hole through which the horizontal steel bar (11) passes at the center of the concrete pad (1). The concrete pad (1) forms a closed annular block structure with the wedge (5) after the wedge (5) is inserted into the slot (2), and the center of gravity does not coincide with the center of the circle.

2. The gravity self-balancing concrete protective layer pad block as described in claim 1, characterized in that: The concrete pad (1) forms a closed annular block structure with the wedge (5) at the installation side of the wedge (5) after the wedge (5) is inserted into the slot (2).

3. The gravity self-balancing concrete protective layer pad block as described in claim 1, characterized in that: The wedge (5) is a trapezoidal block structure with a smaller end near the horizontal steel bar (11) and a larger end away from the horizontal steel bar (11).

4. The gravity self-balancing concrete protective layer pad block as described in claim 1, characterized in that: The wedge (5) is an inverted trapezoidal block structure with a larger end near the horizontal reinforcing bar (11) and a smaller end away from the horizontal reinforcing bar (11).

5. The gravity self-balancing concrete protective layer pad block as described in claim 1, characterized in that: The concrete pad (1) has a counterweight area (3) on both sides of the slot (2) so that the center of gravity of the concrete pad (1) does not coincide with the center of the circle.

6. The gravity self-balancing concrete protective layer pad block as described in claim 5, characterized in that: The counterweight area (3) is either a thickened area with increased axial thickness or a high-density area with high-density inserts installed.

7. The gravity self-balancing concrete protective layer pad block as described in claim 1, characterized in that: The wedge (5) is a counterweight with a density greater than that of the concrete pad (1) and a lighter end near the horizontal reinforcing bar (11) and a heavier end away from the horizontal reinforcing bar (11).

8. A gravity-balanced self-balancing concrete protective layer pad as described in claim 1, characterized in that: The concrete pad (1) has a groove (4) for weight reduction on the side opposite to the slot (2).

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