CN112461649A - Concrete axle center tensile strength inserted sheet clamping method normal position detection device - Google Patents
Concrete axle center tensile strength inserted sheet clamping method normal position detection device Download PDFInfo
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- CN112461649A CN112461649A CN202011106143.2A CN202011106143A CN112461649A CN 112461649 A CN112461649 A CN 112461649A CN 202011106143 A CN202011106143 A CN 202011106143A CN 112461649 A CN112461649 A CN 112461649A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/04—Chucks
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0017—Tensile
Abstract
An in-situ detection device for concrete axis tensile strength by an insert clamping method comprises a clamp structure for clamping a semi-dumbbell-shaped sample in solid concrete; the clamp structure is fixedly connected with the force transmission structure through a metal connecting bolt and is connected with the counter-force structure and the force application structure through the force transmission structure; the longitudinal axes of the semi-dumbbell-shaped test sample, the clamp structure and the force transmission structure are coaxial. The detection device is used for clamping the semi-dumbbell-shaped test sample, then applying axial tension on the semi-dumbbell-shaped test sample until the semi-dumbbell-shaped test sample is separated from solid concrete and damaged, reading the maximum tension value, and calculating the axial tensile strength of the concrete according to the tension area, so that the detection device is strong in practicability and accurate in detection.
Description
Technical Field
The invention relates to an in-situ detection device for concrete axle center tensile strength by an insert clamping method.
Background
The tensile strength of the concrete axle center is one of physical and mechanical indexes of the concrete, and has important influence on the durability of the concrete. If the temperature stress is greater than the tensile strength of the concrete axle center, temperature cracks can be generated; when the shrinkage stress is greater than the tensile strength of the concrete axis, shrinkage cracks are generated. Therefore, the in-situ detection of the tensile strength of the concrete axle center has very important significance for identifying and analyzing the cause of the concrete crack.
In the prior art, no method standard for in-situ detection of the tensile strength of the concrete axle center exists, so that only qualitative analysis can be carried out and quantitative analysis cannot be carried out when the formation reason of the concrete cracks is identified and analyzed, and design improvement is needed.
Disclosure of Invention
The invention provides an in-situ detection device for the tensile strength of a concrete axle center by an insert clamping method, which is convenient to assemble and reasonable in design, and a detection method adopting the in-situ detection device.
The technical scheme adopted by the invention is as follows: an in-situ detection device for concrete axis tensile strength by an insert clamping method comprises a clamp structure for clamping a semi-dumbbell-shaped sample in solid concrete; the clamp structure is fixedly connected with the force transmission structure through a metal connecting bolt and is connected with the counter-force structure and the force application structure through the force transmission structure; the longitudinal axes of the semi-dumbbell-shaped test sample, the clamp structure and the force transmission structure are coaxial. The detection device is used for clamping the semi-dumbbell-shaped test sample, then axial tension is applied to the semi-dumbbell-shaped test sample until the semi-dumbbell-shaped test sample is separated from solid concrete and damaged, the maximum tension value is read, and the tensile strength of the axis of the concrete is calculated according to the tension area.
Further, the semi-dumbbell-shaped test sample comprises a cylinder at the lower part, an inverted frustum at the middle part and a cylinder at the upper part; the bottom surface of the lower cylinder is connected with solid concrete, the top surface of the lower cylinder is connected with the bottom surface of the inverted frustum in the middle, and the height of the lower cylinder is not less than 20 mm; the taper of the round table of the inverted frustum body in the middle part is 25-35 degrees, the top surface is connected with the bottom surface of the cylinder at the upper part, and the height is 9-11 mm; the height of the upper cylinder is not less than 70 mm.
Furthermore, the clamp structure comprises a metal hollow sleeve for sleeving the semi-dumbbell-shaped test sample and a metal wedge-shaped insertion sheet embedded between the semi-dumbbell-shaped test sample and the metal hollow sleeve; the metal hollow sleeve is hollow and cylindrical, 4 connecting screw holes fixedly connected with the force transmission structure are uniformly tapped on the edge of the upper surface of the metal hollow sleeve, the height of the cylinder is slightly larger than that of a cylinder at the upper part of the semi-dumbbell-shaped test sample, and an inverted frustum-shaped central through hole with the cone of a circular truncated cone of 3-5 degrees is formed in the cylinder; the metal wedge-shaped inserting sheet is in a four-sheet hollow round table shape, the taper of the round table is the same as that of the inverted round table-shaped central through hole of the metal hollow sleeve, the height of the round table enables the diameter of the upper surface of the round table to be larger than that of the upper surface of the inverted round table-shaped central through hole of the hollow sleeve, and the inside of the round table is provided with a cylindrical central through hole with the diameter equal to the outer diameter.
Further, the force transmission structure comprises a metal round cover plate and a metal force transmission screw rod; the diameter of the metal round cover plate is equal to the outer diameter of the metal hollow sleeve, the thickness of the metal round cover plate is not less than 10mm, 4 connecting round holes matched with the connecting screw holes are drilled, and the bottom surface of the metal round cover plate is tightly propped against the top surface of the metal wedge-shaped inserting sheet; the lower end of the metal force transmission screw rod is vertically installed at the center of the top surface of the metal circular cover plate, and the upper end of the metal force transmission screw rod is connected with a counter-force structure and a force application structure.
Further, the counter-force structure comprises a metal concave main body, the bottom surface of the metal concave main body is erected on the surface of the solid concrete, and the semi-dumbbell-shaped test sample, the clamp structure and part of the force transmission structure are covered under the metal concave main body.
Further, the force application structure is mounted on the upper surface of the metal concave main body and is a pulling structure which enables the clamp structure and the force transmission structure to move relative to the semi-dumbbell-shaped test sample. The pulling structure can adopt various structures such as a small jack structure and the like, and the clamp structure and the force transmission structure can move relative to the semi-dumbbell-shaped test sample as long as the pulling structure conforms to the requirement.
Furthermore, a display screen for displaying the pulling force value is arranged on the force application structure; and the force application structure is provided with a control element for detecting the tension value applied to the semi-dumbbell-shaped test sample by the force application structure.
The invention has the beneficial effects that: (1) in the detection process, a detection device is adopted to apply axial tension to the semi-dumbbell-shaped test sample, the maximum tension value is measured, and the tensile strength of the axis of the concrete is calculated according to the tension area, so that the practicability is high, and the detection is accurate; (2) the problem that no in-situ detection method for the tensile strength of the concrete axle center exists in the prior art can be solved; (3) the semi-dumbbell-shaped test sample is adopted, so that the influence of stress concentration is counteracted, and the detection accuracy is enhanced; (4) the method can solve the problem that only qualitative analysis can be carried out and quantitative analysis cannot be carried out when concrete cracks are identified and analyzed.
Drawings
Fig. 1 is a schematic front view of the present invention in use.
Fig. 2 is a schematic front view of the structure of the present invention.
Fig. 3 is a schematic elevation of the use of the present invention.
Figure 4 is a schematic cross-sectional view of the invention using a-a.
Fig. 5 is a schematic cross-sectional view of the present invention using B-B.
Figure 6 is a schematic cross-sectional view of the invention using C-C.
Figure 7 is a schematic cross-sectional view of the invention using D-D.
FIG. 8 is a schematic diagram of the grinding of the middle inverted frustum of a semi-dumbbell test specimen of the present invention.
FIG. 9 is a schematic view of the milling of the bottom cylinder of a semi-dumbbell test specimen of the present invention.
Detailed Description
The present invention is further illustrated by the following examples, which are not intended to limit the invention to these embodiments. It will be appreciated by those skilled in the art that the present invention encompasses all alternatives, modifications and equivalents as may be included within the scope of the claims.
Referring to fig. 1-9, an in-situ detection device for concrete axial tensile strength by insert clamping method comprises a clamp structure 11 for clamping a semi-dumbbell-shaped test sample 16 in solid concrete 13; the clamp structure 11 is fixedly connected with the force transmission structure 8 through a metal connecting bolt 7 and is connected with the counter-force structure 5 and the force application structure 2 through the force transmission structure 8; the longitudinal axes of the semi-dumbbell-shaped test sample 16, the clamp structure 11 and the force transmission structure 8 are coaxial. The invention clamps the semi-dumbbell-shaped test sample 16 through the detection device, then applies axial tension on the semi-dumbbell-shaped test sample 16 until the semi-dumbbell-shaped test sample 16 is separated from the solid concrete 13 to be damaged, reads the maximum tension value, and calculates the tensile strength of the axle center of the concrete according to the tension area.
The semi-dumbbell shaped test specimen 16 of this embodiment comprises a lower cylinder, an inverted frustum at the middle and an upper cylinder; the bottom surface of the lower cylinder is connected with the solid concrete 13, the top surface of the lower cylinder is connected with the bottom surface of the inverted frustum in the middle, the height is 20mm, and the diameter is 88 mm; the taper of the inverted frustum round platform in the middle part is 30 degrees, the top surface is connected with the bottom surface of the cylinder at the upper part, and the height is 10 mm; the height of the upper cylinder is 70mm, and the diameter is 100 mm.
The fixture structure 11 of this embodiment includes a metal hollow sleeve 12 for housing a semi-dumbbell specimen 16, and a metal wedge insert 15 inserted between the semi-dumbbell specimen 16 and the metal hollow sleeve 12. The metal hollow sleeve 12 is hollow and cylindrical, and has an outer diameter of 150mm and a height of 75 mm; 4 connecting screw holes 10 fixedly connected with the force transmission structure 8 are uniformly tapped on the edge of the upper surface, and the aperture is 8 mm; the inner part is an inverted frustum-shaped central through hole with 3.8-degree conical degree of the circular truncated cone, the diameter of the upper surface of the through hole is 120mm, and the diameter of the lower surface of the through hole is 110 mm. The metal wedge-shaped inserting sheet 15 is in a four-sheet type hollow inverted round table shape, the taper of the round table is 3.8 degrees, the height of the round table is 85mm, and a cylindrical central through hole with the diameter of 100mm is formed in the round table.
The force transmission structure 8 comprises a metal round cover plate 9 and a metal force transmission screw rod 1. The diameter of the metal round cover plate 9 is 150mm, the thickness of the metal round cover plate is 10mm, 4 connecting round holes 6 matched with the connecting screw holes 10 are drilled, and the bottom surface of the metal round cover plate is tightly propped against the top surface of the metal wedge-shaped inserting piece 15. The lower end of the metal force transmission screw rod 1 is vertically arranged at the center of the top surface of the metal round cover plate 9, and the upper end of the metal force transmission screw rod is connected with a counter-force structure 5 and a force application structure 2.
The reaction structure 5 of this embodiment comprises a metal concave body, the bottom surface of which is erected on the surface of the solid concrete 13 and covers the semi-dumbbell-shaped test specimen 16, the clamp structure 11 and part of the force transmission structure 8.
In this embodiment, the force application structure 2 is mounted on the upper surface of the metal concave body, and is a pulling structure for moving the clamp structure 11 and the force transmission structure 8 relative to the semi-dumbbell shaped test sample 16. The pulling structure adopts a small jack structure.
In this embodiment, the force application structure 2 is provided with a display screen 4 for displaying a pulling force value; and the force application structure 2 is provided with a control element 3 for detecting the tensile force value applied by the force application structure 2 to the semi-dumbbell-shaped test sample 15.
The detection steps of this embodiment are as follows: (1) polishing and flattening the surface of the solid concrete 13; (2) mounting the diamond thin-wall hollow drill bit with the inner diameter of 100mm on a drilling machine with a positioning device, and drilling a concrete annular groove with the depth of 100mm on the solid concrete 13 to form a concrete cylinder with the diameter of 100mm and the height of 100 mm; taking down the diamond thin-wall hollow drill bit of 100mm, changing to an upper diamond thin-wall hollow drill bit with the inner diameter of 160 mm, and drilling out a concrete annular groove with the depth of 100 mm; removing the concrete among the 2 annular grooves and polishing the bottom of the groove to form an operation groove 14; (3) a portable concrete groove grinding machine 17 with a positioning device extension bar 18 is adopted, and a circular table diamond grinding head 19 with the height of 10mm and the taper of 30 degrees is matched; the bottom surface of the circular truncated cone diamond grinding head 19 and the top surface of the cylinder at the lower part of the semi-dumbbell-shaped test sample 16 are positioned on the same horizontal plane; the extension bar 18 clings to the side surface of the concrete cylinder to grind the concrete cylinder in a rotating way, the bottom surface of the round platform diamond grinding head 19 is ground and enters the concrete cylinder by 5.8mm, and the top surface of the round platform diamond grinding head does not grind and enters the concrete cylinder; (4) a portable concrete groove grinding machine 17 with a positioning device extension bar 18 is adopted to be matched with a cylindrical diamond grinding head 20 with the height of 20 mm; the top surface of the cylindrical diamond grinding head 20 and the top surface of the cylinder at the lower part of the semi-dumbbell-shaped sample 16 are positioned at the same horizontal plane; the lengthening bar 18 clings to the side surface of the concrete cylinder to grind the concrete cylinder in a rotating way, and the cylindrical diamond grinding head 20 grinds the concrete cylinder by 5.8 mm; (5) forming a semi-dumbbell-shaped test sample 16 through the steps (1) to (4); the metal hollow sleeve 12 is sleeved in the semi-dumbbell-shaped sample 16, and the metal wedge-shaped insertion sheet 15 is embedded between the semi-dumbbell-shaped sample 16 and the metal hollow sleeve 12; a metal round cover plate 9 is placed on the top surface of the metal wedge-shaped inserting piece 15, 4 metal connecting bolts 7 with the specification of M8 penetrate through the positioning round holes 6 and are screwed into the connecting screw holes 10, and the metal connecting bolts are screwed tightly, so that the clamp structure 11 tightly clamps the semi-dumbbell-shaped test sample 16; (6) the upper end of the metal force transmission screw rod 1 is connected with a counter-force structure 5 and a force application structure 2; (7) and applying axial tension on the semi-dumbbell-shaped test sample 16 through the force transmission structure 8 and the clamp structure 11 by using the force application structure 2 and the counter-force structure 5 until the semi-dumbbell-shaped test sample 16 is separated from the solid concrete 13 and is damaged, reading the maximum tension value, and calculating the tensile strength of the axis of the concrete according to the tension area.
Claims (8)
1. The utility model provides a tight method normal position detection device of concrete axle center tensile strength inserted sheet clamp, its characterized in that: comprises a clamp structure for clamping a semi-dumbbell-shaped sample in solid concrete; the clamp structure is fixedly connected with the force transmission structure through a metal connecting bolt and is connected with the counter-force structure and the force application structure through the force transmission structure; the longitudinal axes of the semi-dumbbell-shaped test sample, the clamp structure and the force transmission structure are coaxial.
2. The in-situ detection device for the concrete axle center tensile strength insert clamping method according to claim 1, characterized in that: the semi-dumbbell-shaped test sample comprises a cylinder at the lower part, an inverted circular truncated cone at the middle part and a cylinder at the upper part; the bottom surface of the lower cylinder is connected with solid concrete, the top surface of the lower cylinder is connected with the bottom surface of the inverted frustum in the middle, and the height of the lower cylinder is not less than 20 mm; the taper of the round table of the inverted frustum body in the middle part is 25-35 degrees, the top surface is connected with the bottom surface of the cylinder at the upper part, and the height is 9-11 mm; the height of the upper cylinder is not less than 70 mm.
3. The in-situ detection device for the concrete axle center tensile strength insert clamping method according to claim 1, characterized in that: the fixture structure comprises a metal hollow sleeve for sleeving the semi-dumbbell-shaped test sample and a metal wedge-shaped insertion sheet embedded between the semi-dumbbell-shaped test sample and the metal hollow sleeve; the metal hollow sleeve is hollow and cylindrical, 4 connecting screw holes fixedly connected with the force transmission structure are uniformly tapped on the edge of the upper surface of the metal hollow sleeve, the height of the cylinder is slightly larger than that of a cylinder at the upper part of the semi-dumbbell-shaped test sample, and an inverted frustum-shaped central through hole with the cone of a circular truncated cone of 3-5 degrees is formed in the cylinder; the metal wedge-shaped inserting sheet is in a four-sheet hollow round table shape, the taper of the round table is the same as that of the inverted round table-shaped central through hole of the metal hollow sleeve, the height of the round table enables the diameter of the upper surface of the round table to be larger than that of the upper surface of the inverted round table-shaped central through hole of the hollow sleeve, and the inside of the round table is provided with a cylindrical central through hole with the diameter equal to the outer diameter.
4. The in-situ detection device for the concrete axle center tensile strength insert clamping method according to claim 1, characterized in that: the force transmission structure comprises a metal round cover plate and a metal force transmission screw rod; the diameter of the metal round cover plate is equal to the outer diameter of the metal hollow sleeve, the thickness of the metal round cover plate is not less than 10mm, 4 connecting round holes matched with the connecting screw holes are drilled, and the bottom surface of the metal round cover plate is tightly propped against the top surface of the metal wedge-shaped inserting sheet; the lower end of the metal force transmission screw rod is vertically installed at the center of the top surface of the metal circular cover plate, and the upper end of the metal force transmission screw rod is connected with a counter-force structure and a force application structure.
5. The in-situ detection device for the concrete axle center tensile strength insert clamping method according to claim 1, characterized in that: the reaction structure comprises a metal concave main body, the bottom surface of the metal concave main body is erected on the surface of solid concrete, and the semi-dumbbell-shaped test sample, the clamp structure and part of the force transmission structure are covered under the metal concave main body.
6. The in-situ detection device for the concrete axle center tensile strength insert clamping method according to claim 1, characterized in that: the force application structure is arranged on the upper surface of the metal concave main body and is a pulling structure which enables the clamp structure and the force transmission structure to move relative to the semi-dumbbell-shaped test sample; the pulling structure can adopt various structures such as a small jack structure and the like, and the clamp structure and the force transmission structure can move relative to the semi-dumbbell-shaped test sample as long as the pulling structure conforms to the requirement.
7. The in-situ detection device for the concrete axle center tensile strength insert clamping method according to claim 1, characterized in that: the force application structure is provided with a display screen for displaying a pulling force value; and the force application structure is provided with a control element for detecting the tension value applied to the semi-dumbbell-shaped test sample by the force application structure.
8. A detection method of an in-situ detection device for shear strength between an asphalt road surface layer and a base layer by an inclined cylinder method comprises the following detection steps: (1) polishing and flattening the surface of the solid concrete; (2) mounting a diamond thin-wall hollow drill bit with the inner diameter of 100mm on a drilling machine with a positioning device, and drilling a concrete annular groove with the depth of 100mm on the solid concrete to form a concrete cylinder with the diameter of 100mm and the height of 100 mm; taking down the diamond thin-wall hollow drill bit of 100mm, changing to an upper diamond thin-wall hollow drill bit with the inner diameter of 160 mm, and drilling out a concrete annular groove with the depth of 100 mm; removing the concrete among the 2 annular grooves and polishing the bottom of the groove to form an operation groove; (3) a portable concrete groove grinding machine with a positioning device extension bar is adopted, and a round table diamond grinding head with the height of 10mm and the taper of 30 degrees is matched; the bottom surface of the circular truncated cone diamond grinding head and the top surface of the cylinder at the lower part of the semi-dumbbell-shaped sample are positioned on the same horizontal plane; the lengthening rod clings to the side surface of the concrete cylinder to rotatably grind the concrete cylinder, the bottom surface of the round table diamond grinding head is ground and enters the concrete cylinder by 5.8mm, and the top surface of the round table diamond grinding head does not grind and enters the concrete cylinder; (4) a portable concrete groove grinding machine with a positioning device lengthening bar is adopted, and a cylindrical diamond grinding head with the height of 20mm is matched; the top surface of the cylindrical diamond grinding head and the top surface of the cylinder at the lower part of the semi-dumbbell-shaped sample are positioned on the same horizontal plane; the lengthening rod clings to the side surface of the concrete cylinder to rotate and grind the concrete cylinder, and the cylindrical diamond grinding head grinds and enters the concrete cylinder by 5.8 mm; (5) forming a semi-dumbbell-shaped sample through the steps (1) to (4); the metal hollow sleeve is sleeved in the semi-dumbbell-shaped sample, and the metal wedge-shaped insertion sheet is embedded between the semi-dumbbell-shaped sample and the metal hollow sleeve; the metal round cover plate is placed on the top surface of the metal wedge-shaped inserting piece, 4 metal connecting bolts penetrate through the positioning round holes and are screwed into the connecting screw holes, and the metal connecting bolts are screwed tightly, so that the clamp structure tightly clamps the semi-dumbbell-shaped test sample; (6) the upper end of the metal force transmission screw is connected with a counter-force structure and a force application structure; (7) and applying axial tension on the semi-dumbbell-shaped test sample by using the force application structure and the counter-force structure through the force transmission structure and the clamp structure until the semi-dumbbell-shaped test sample is separated from the solid concrete and damaged, reading the maximum tension value, and calculating the tensile strength of the axis of the concrete according to the tension area.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011106143.2A CN112461649A (en) | 2020-10-16 | 2020-10-16 | Concrete axle center tensile strength inserted sheet clamping method normal position detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011106143.2A CN112461649A (en) | 2020-10-16 | 2020-10-16 | Concrete axle center tensile strength inserted sheet clamping method normal position detection device |
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| Publication Number | Publication Date |
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| CN112461649A true CN112461649A (en) | 2021-03-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011106143.2A Pending CN112461649A (en) | 2020-10-16 | 2020-10-16 | Concrete axle center tensile strength inserted sheet clamping method normal position detection device |
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| Country | Link |
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| CN (1) | CN112461649A (en) |
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2020
- 2020-10-16 CN CN202011106143.2A patent/CN112461649A/en active Pending
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