A concrete reinforcement bond strength testing device

Abstract

The present invention discloses a concrete steel bar bond strength detection device, which relates to the technical field of bond strength detection. The present invention comprises a bottom plate, on which four columns are fixed at equal intervals; a top plate, fixed on the upper end surfaces of the four columns, and the four columns are located near the four top corners of the top plate; a downward pressure cylinder, fixed in the middle position of the top plate; a lower pressure plate, fixed on the upper end surface of the bottom plate; four positioning assemblies, all fixed on the upper end surface of the bottom plate, and respectively located in the middle positions of the four sides of the lower pressure plate; a downward pressure assembly, slidably arranged on the four columns, and connected to the output end of the downward pressure cylinder; wherein, embedded concrete is placed on the lower pressure plate, and a plurality of steel bars are embedded in the embedded concrete; in the present invention, different steel bars are embedded in one embedded concrete, so that there is only one set of variables during detection, thereby comparing the concrete steel bar bond strength under different conditions.

Description

Technical Field

[0001] The invention relates to the technical field of bond strength detection, in particular to a concrete steel bar bond strength detection device. Background Art

[0002] The bond strength of concrete reinforcement refers to the ability of concrete to resist the sliding of reinforcement. It is usually expressed by the bond strength of concrete. The bond strength is the shear stress along the contact surface between reinforcement and concrete, that is, the bonding stress. It varies with the type of reinforcement, appearance and shape, and the location of the reinforcement in the concrete. It is also related to the strength of the concrete itself.

[0003] Existing tests on the bond strength of concrete reinforcement all use a single embedded concrete, that is, a steel bar is embedded in the concrete, so that the bond strength between different steel bars and concrete is tested through multiple groups of tests. However, when the embedded concrete is made, external factors may cause differences in the bonding strength of the concrete when it solidifies, resulting in low accuracy in the comparison structure of multiple groups of embedded concrete tests. In addition, when pressurizing the steel bars, the steel bars are easily deformed, affecting the test effect.

[0004] In view of the above problems, the present invention provides a concrete steel bar bond strength testing device to solve the above problems. Summary of the invention

[0005] To achieve the above object, the present invention provides the following technical solution: a concrete reinforcement bond strength testing device, comprising:

[0006] a base plate on which four uprights are fixed at equal distances;

[0007] A top plate, fixed to the upper end surfaces of the four uprights, and the four uprights are located near the four corners of the top plate;

[0008] A downward pressing cylinder is fixed at the middle position of the top plate;

[0009] A lower pressing plate, fixed on the upper end surface of the bottom plate;

[0010] The positioning components are configured as four, all of which are fixed on the upper end surface of the bottom plate and are respectively located in the middle positions of the four sides of the lower pressing plate;

[0011] A pressing assembly is slidably disposed on the four uprights and connected to the output end of the pressing cylinder;

[0012] Among them, embedded concrete is placed on the lower pressure plate, and multiple steel bars are embedded in the embedded concrete, and the types of embedded steel bars are divided into multiple modes according to detection requirements. In mode one, the outer wall textures of the multiple steel bars are different, and the diameters and embedding depths of the steel bars are the same. In mode two, the diameters of the multiple steel bars are different, and the outer wall textures and embedding depths of the steel bars are the same. In mode three, the embedding depths of the multiple steel bars are different, and the outer wall textures and diameters of the steel bars are the same.

[0013] Further, preferably, a plurality of avoidance holes are provided on the lower pressure plate, and the plurality of avoidance holes correspond to the positions of the steel bars on the embedded concrete, and sliding grooves are provided at the middle positions of the four sides of the lower pressure plate.

[0014] Further, preferably, the positioning component includes:

[0015] A positioning cylinder body fixed on the base plate;

[0016] A push bar, fixed at the output end of the positioning cylinder;

[0017] A sliding block is transversely slidably arranged on the pushing bar, and a positioning spring is arranged between the sliding block and the pushing bar, and the sliding block is slidably connected to the sliding groove;

[0018] The positioning block is vertically slidably arranged inside the sliding block, and a pushing surface is provided on the bottom of the positioning block and the pushing bar.

[0019] Further, preferably, the pressing assembly comprises:

[0020] The upper pressure plate is connected to the lower pressure cylinder body by a connecting plate, and the connecting plate and the lower pressure cylinder body are connected by a floating joint;

[0021] The pressure column is configured as a plurality of pressure columns, each of which is slidably disposed in the upper pressure plate and corresponds one-to-one to the plurality of steel bars;

[0022] A downward pressure spring installed between the upper pressure plate and the pressure column;

[0023] A plurality of pressure sensors are configured, all of which are fixed in the upper pressure plate and correspond to the downward pressure springs;

[0024] The floating assembly is configured as a plurality of floating assemblies, which are slidably disposed in the upper pressure plate and correspond one-to-one to the plurality of pressure columns.

[0025] Further, preferably, the floating assembly comprises:

[0026] The adjusting blocks are configured as two, are slidably disposed in the upper pressing plate, and are symmetrically arranged on both sides of the pressure column;

[0027] An adjusting spring is installed between the adjusting block and the upper pressing plate;

[0028] A connecting rod has one end hinged on the adjusting block and the other end hinged with a supporting component, and the supporting component is slidably connected to the pressure column.

[0029] Further, preferably, the supporting component comprises:

[0030] A supporting cylinder is hinged on the two connecting rods;

[0031] The main supporting plate is configured as two plates, and is symmetrically slidably arranged in the supporting cylinder by using a plurality of sliding columns, and a supporting spring is arranged between the sliding column and the supporting cylinder;

[0032] The auxiliary supporting plate is symmetrically hinged on both sides of the main supporting plate, and an arc-shaped guide column is fixed on one side of the auxiliary supporting plate close to the main supporting plate. The arc-shaped guide column is slidably arranged in the main supporting plate, and a return spring is arranged between the auxiliary supporting plate and the main supporting plate.

[0033] Further, preferably, a plurality of rollers are rotatably provided on the main supporting plate and the auxiliary supporting plate, and the plurality of rollers rotate along the axial direction of the supporting cylinder.

[0034] Compared with the prior art, the present invention provides a concrete steel bar bond strength testing device, which has the following beneficial effects:

[0035] The present invention embeds different steel bars in one reinforced concrete so that there is only one set of variables during detection, thereby avoiding the influence of the concrete mixing ratio on the bond strength when using multiple reinforced concretes. Therefore, the bond strength of concrete and steel bars under different conditions can be effectively compared, and the detection accuracy can be improved. In addition, the detection efficiency can be greatly improved by applying pressure to multiple steel bars at the same time, and the steel bars can be supported by supporting components when pressure is applied to the steel bars, thereby avoiding deformation and tilting of the steel bars, which affects the detection results. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic diagram of the overall structure of a concrete steel bar bond strength testing device.

[0037] Figure 2 The present invention is a schematic diagram of the structure of a lower pressure plate in a concrete reinforcement bond strength testing device.

[0038] Figure 3 The figure is a schematic diagram of the structure of the positioning component in a concrete reinforcement bond strength testing device.

[0039] Figure 4 The figure is a schematic diagram of the structure of a downward pressing component in a concrete reinforcement grip strength testing device.

[0040] Figure 5 The figure is a schematic diagram of the structure of the supporting components in a concrete reinforcement bond strength testing device.

[0041] In the figure: 1. bottom plate; 2. column; 3. top plate; 4. downward pressure cylinder; 5. downward pressure plate; 6. positioning assembly; 7. embedded concrete; 8. downward pressure assembly; 51. avoidance hole; 52. sliding groove; 61. positioning cylinder; 62. pushing bar; 63. sliding block; 64. positioning block; 65. pushing surface; 81. connecting plate; 82. upper pressure plate; 83. pressure column; 84. downward pressure spring; 85. pressure sensor; 86. supporting assembly; 87. connecting rod; 88. adjusting block; 89. adjusting spring; 861. supporting cylinder; 862. sliding column; 863. main supporting plate; 864. supporting spring; 865. auxiliary supporting plate; 866. arc guide column; 867. roller. DETAILED DESCRIPTION

[0042] Reference Figure 1-Figure 5 The present invention provides a technical solution: a concrete steel bar bond strength detection device, comprising:

[0043] A base plate 1, on which four uprights 2 are fixed at equal intervals;

[0044] A top plate 3 is fixed on the upper end surfaces of the four upright posts 2, and the four upright posts 2 are located near the four corners of the top plate 3;

[0045] A downward pressing cylinder 4 is fixed at the middle position of the top plate 3;

[0046] A lower pressing plate 5 is fixed on the upper end surface of the bottom plate 1;

[0047] The positioning components 6 are configured as four, all of which are fixed on the upper end surface of the bottom plate 1 and are respectively located in the middle positions of the four sides of the lower pressing plate 5;

[0048] A pressing assembly 8 is slidably disposed on the four uprights 2 and connected to the output end of the pressing cylinder 4;

[0049] Among them, embedded reinforcement concrete 7 is placed on the lower pressure plate 5, and multiple steel bars are embedded in the embedded reinforcement concrete 7, and the embedded steel bar types are divided into multiple modes according to the detection requirements. In mode one, the outer wall textures of the multiple steel bars are different, and the diameters and embedding depths of the steel bars are the same. In mode two, the diameters of the multiple steel bars are different, and the outer wall textures and embedding depths of the steel bars are the same. In mode three, the embedding depths of the multiple steel bars are different, and the outer wall textures and diameters of the steel bars are the same.

[0050] It should be noted that when the steel bars are buried, the height of the steel bars extending out of the concrete must remain consistent, so that the downward pressure component 8 can perform downward pressure detection on multiple steel bars at the same time. That is to say, when testing the situation of mode three, the lengths of multiple steel bars are different. The burial depth can be changed while ensuring that the height of the steel bars extending out of the concrete is consistent, thereby testing the grip strength at different burial depths.

[0051] In this embodiment, a plurality of avoidance holes 51 are provided on the lower pressing plate 5 , and the plurality of avoidance holes 51 correspond to the positions of the steel bars on the embedded concrete 7 , and sliding grooves 52 are provided in the middle positions of the four sides of the lower pressing plate 5 .

[0052] That is to say, during the detection, when a steel bar slips relative to the concrete, the pressure causing the steel bar to slip is recorded. At the same time, the downward pressure component 8 continues to press down, and the remaining steel bars that have not slipped are continued to be detected. At this time, the steel bars that slip and penetrate the concrete are avoided through the avoidance holes 51.

[0053] As a preferred embodiment, the positioning component 6 includes:

[0054] A positioning cylinder 61 is fixed on the base plate 1;

[0055] A push bar 62, fixed at the output end of the positioning cylinder 61;

[0056] A sliding block 63 is transversely slidably disposed on the push bar 62, and a positioning spring is disposed between the sliding block 63 and the push bar 62, and the sliding block 63 is slidably connected to the sliding groove 52;

[0057] The positioning block 64 is vertically slidably disposed in the sliding block 63 , and a pushing surface 65 is formed on the bottom of the positioning block 64 and the pushing bar 62 .

[0058] That is to say, during the inspection, the embedded steel bar concrete 7 is first placed on the lower pressure plate 5, and then the position of the embedded steel bar concrete 7 is pushed by the positioning block 64 of the positioning component 6, so that the steel bar is aligned with the avoidance hole 51 and the lower pressure component 8. At this time, continuing to apply force through the positioning cylinder 61 can enable the pushing bar 62 to push the positioning block 64 to slide upward, thereby leveling the embedded steel bar concrete 7 and making the steel bar in a vertical state, avoiding the uneven bottom surface of the embedded steel bar concrete 7 when it is made, which affects the inspection result.

[0059] It should be noted that after the embedded reinforcement concrete 7 is leveled, a cushion block needs to be placed between the raised portion of the embedded reinforcement concrete 7 and the lower pressure plate 5 to support the embedded reinforcement concrete 7 and prevent the positioning block 64 from being damaged due to excessive pressure.

[0060] In this embodiment, the pressing assembly 8 includes:

[0061] The upper pressing plate 82 is connected to the lower pressing cylinder 4 by a connecting plate 81, and the connecting plate 81 and the lower pressing cylinder 4 are connected by a floating joint;

[0062] The pressure column 83 is configured as a plurality of columns, each of which is slidably disposed in the upper pressure plate 82 and corresponds one-to-one to the plurality of steel bars;

[0063] A downward pressure spring 84 is installed between the upper pressure plate 82 and the pressure column 83;

[0064] The pressure sensors 85 are configured as a plurality of sensors, all of which are fixed in the upper pressure plate 82 and correspond to the downward pressure springs 84;

[0065] The floating assembly is configured as a plurality of floating assemblies, which are slidably disposed in the upper pressure plate 82 and correspond one-to-one to the plurality of pressure columns 83 .

[0066] As a preferred embodiment, the floating assembly includes:

[0067] The adjusting blocks 88 are configured as two, are slidably disposed in the upper pressing plate 82, and are symmetrically arranged on both sides of the pressure column 83;

[0068] An adjusting spring 89 is installed between the adjusting block 88 and the upper pressing plate 82;

[0069] The connecting rod 87 has one end hinged on the adjusting block 88 and the other end hinged with the supporting assembly 86 , and the supporting assembly 86 is slidably connected to the pressure column 83 .

[0070] During the inspection, the steel bars are first placed in the supporting assembly 86. At this time, the supporting assembly 86 pushes the adjusting block 88 close to the embedded concrete 7 through the adjusting spring 89, so that the bottom surface of the supporting assembly 86 contacts the top of the embedded concrete 7, thereby supporting the supporting assembly 86 on three sides and improving the stability of the steel bar support.

[0071] As a preferred embodiment, the supporting component 86 includes:

[0072] The supporting cylinder 861 is hinged on the two connecting rods 87;

[0073] The main supporting plate 863 is configured as two, and a plurality of sliding columns 862 are symmetrically slidably arranged in the supporting tube 861, and a supporting spring 864 is arranged between the sliding column 862 and the supporting tube 861;

[0074] The auxiliary supporting plate 865 is symmetrically hinged on both sides of the main supporting plate 863, and an arc guide column 866 is fixed on one side of the auxiliary supporting plate 865 close to the main supporting plate 863. The arc guide column 866 is slidably set in the main supporting plate 863, and a return spring is set between the auxiliary supporting plate 863 and the main supporting plate 863.

[0075] As a preferred embodiment, a plurality of rollers 867 are rotatably provided on the main supporting plate 863 and the auxiliary supporting plate 865 , and the plurality of rollers 867 rotate along the axial direction of the supporting cylinder 861 .

[0076] That is to say, after the steel bar enters the supporting assembly 86, it is mainly supported by the main supporting plate 863, and then the auxiliary supporting plate 865 provides auxiliary support to the steel bar through the reset spring, thereby wrapping the steel bar to improve the supporting effect and avoid deformation and tilting of the steel bar under force. When pressing down on the steel bar, the roller 867 can avoid generating large friction on the steel bar to affect the detection result, and while pressing down, the two adjustment blocks 88 move away from each other, so that the pressing assembly 8 rises while pressing down, providing continuous supporting force for the steel bar.

[0077] Specifically, the detection mode is determined first, and then the embedded steel concrete 7 is placed on the lower pressure plate 5, and then the embedded steel concrete 7 is positioned by the positioning component 6. Then the lower pressure component 8 is pressed down by the lower pressure cylinder 4 to make multiple supporting components 86 correspond to the steel bars, so as to perform supporting operations. When the pressure column 83 contacts the steel bars, pressure detection begins. At this time, the value of the pressure sensor 85 gradually increases. When the steel bars slip, it means that there is looseness between the steel bars and the concrete. At this time, the steel bars are pushed by the lower pressure spring 84 to release the pressure, thereby reducing the pressure of the pressure sensor 85. The value of the pressure sensor 85 before the value is reduced is recorded until the pressure of all pressure sensors 85 is reduced, and the grip strength test is completed.

[0078] What is described above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A concrete reinforcement bond strength testing device, characterized in that: include: A bottom plate (1) on which four uprights (2) are fixed at equal intervals; A top plate (3) is fixed on the upper end surfaces of the four upright posts (2), and the four upright posts (2) are located near four corners of the top plate (3); A downward pressing cylinder (4) is fixed at the middle position of the top plate (3); A lower pressing plate (5) fixed to the upper end surface of the bottom plate (1); The positioning components (6) are configured as four, each of which is fixed to the upper end surface of the bottom plate (1) and is respectively located at the middle position of the four sides of the lower pressing plate (5); A pressing assembly (8) is slidably disposed on the four columns (2) and is connected to the output end of the pressing cylinder (4); Wherein, a reinforced concrete (7) is placed on the lower pressure plate (5), a plurality of steel bars are embedded in the reinforced concrete (7), and the embedded steel bars are divided into a plurality of modes according to the detection requirements. Mode 1: the outer wall textures of the plurality of steel bars are different, and the diameters and embedding depths of the steel bars are the same; Mode 2: the diameters of the plurality of steel bars are different, and the outer wall textures and embedding depths of the steel bars are the same; Mode 3: the embedding depths of the plurality of steel bars are different, and the outer wall textures and diameters of the steel bars are the same; The pressing assembly (8) comprises: The upper pressing plate (82) is connected to the lower pressing cylinder body (4) by means of a connecting plate (81), and the connecting plate (81) and the lower pressing cylinder body (4) are connected by means of a floating joint; The pressure columns (83) are configured as a plurality of them, all of which are slidably disposed in the upper pressure plate (82) and correspond one to one to the plurality of steel bars; A downward pressure spring (84) is installed between the upper pressure plate (82) and the pressure column (83); The pressure sensors (85) are configured as a plurality of sensors, all of which are fixed in the upper pressure plate (82) and correspond to the lower pressure springs (84); The floating assembly is configured as a plurality of floating assemblies, which are slidably disposed in the upper pressure plate (82) and correspond one-to-one to the plurality of pressure columns (83); The floating components include: The adjusting blocks (88) are configured as two, are slidably disposed in the upper pressing plate (82), and are symmetrically arranged on both sides of the pressure column (83); An adjusting spring (89) is installed between the adjusting block (88) and the upper pressing plate (82); The connecting rod (87) has one end hinged on the adjusting block (88) and the other end hinged with the supporting assembly (86), and the supporting assembly (86) is slidably connected to the pressure column (83).

2. A concrete reinforcement bond strength testing device according to claim 1, characterized in that: A plurality of avoidance holes (51) are provided on the lower pressing plate (5), and the plurality of avoidance holes (51) correspond to the positions of the steel bars on the embedded concrete (7), and sliding grooves (52) are provided at the middle positions of the four sides of the lower pressing plate (5).

3. A concrete reinforcement bond strength testing device according to claim 2, characterized in that: The positioning component (6) comprises: A positioning cylinder (61) fixed on the base plate (1); A push bar (62) is fixed to the output end of the positioning cylinder (61); A sliding block (63) is transversely slidably disposed on the push bar (62), and a positioning spring is disposed between the sliding block (63) and the push bar (62), and the sliding block (63) is slidably connected to the sliding groove (52); The positioning block (64) is vertically slidably arranged inside the sliding block (63), and a pushing surface (65) is provided on the bottom of the positioning block (64) and the pushing bar (62).

4. The concrete reinforcement bond strength testing device according to claim 1 is characterized in that: The supporting components (86) include: A supporting cylinder (861) is hinged on two connecting rods (87); The main supporting plate (863) is configured as two plates, and adopts a plurality of sliding columns (862) to be symmetrically slidably arranged in the supporting cylinder (861), and a supporting spring (864) is arranged between the sliding column (862) and the supporting cylinder (861); The auxiliary supporting plate (865) is symmetrically hinged on both sides of the main supporting plate (863), and an arc-shaped guide column (866) is fixed on one side of the auxiliary supporting plate (865) close to the main supporting plate (863). The arc-shaped guide column (866) is slidably arranged in the main supporting plate (863), and a return spring is arranged between the auxiliary supporting plate (865) and the main supporting plate (863).

5. A concrete reinforcement bond strength testing device according to claim 4, characterized in that: A plurality of rollers (867) are rotatably disposed on the main supporting plate (863) and the auxiliary supporting plate (865), and the plurality of rollers (867) rotate along the axial direction of the supporting cylinder (861).

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