A low-strength concrete core sample clamping device

Abstract

A low-strength concrete core sample clamping device includes a metal reaction steel ring that is sleeved in an annular groove on the side of a concrete core sample in solid concrete; two wedge-shaped steel inserts are symmetrically arranged between the metal reaction steel ring and the side of the concrete core sample; a downward pressure steel plate, a reaction device and a force-applying device are arranged on the wedge-shaped steel insert in sequence; the reaction device is welded to the metal reaction steel ring and the concrete core sample, the wedge-shaped steel insert, the downward pressure steel plate and part of the force-applying device are covered thereunder. The present invention inserts the wedge-shaped steel insert between the metal reaction steel ring and the side of the concrete core sample, and then uses the downward pressure steel plate, the reaction device and the force-applying device to clamp the wedge-shaped steel insert and take out the concrete core sample, which has strong practicality and reasonable design.

Description

Technical Field

[0001] The invention relates to a low-strength concrete core sample clamping device. Background Art

[0002] Core drilling is a semi-destructive testing method that uses a special drill to drill core samples directly from the structure and infer the strength and durability of concrete based on the core sample indicators. Since the sample comes directly from the concrete entity, the result can better reflect the actual concrete condition, so it is often used as an arbitration testing method.

[0003] In actual testing work, how to remove the concrete core sample smoothly and with minimal damage is a very important step. In the prior art, the concrete core sample is mainly removed by the following method: after the concrete core sample is broken, the top side of the core sample is clamped with a core sample clamp to remove the core sample. The shortcomings of this method are: for low-strength concrete, such as plastic concrete, composite foundation, etc., due to the low strength (generally less than 8MPa), the core sample clamp clamps the core sample. Due to the small length of the clamped core sample and uneven force, the concrete core sample is often pried-shaped and broken at the weak point (the edge of the top surface of the concrete core sample), and the core sample cannot be completely and effectively clamped, resulting in the core sample being unable to be removed.

[0004] In summary, the existing method has the disadvantage that it cannot completely and effectively clamp and remove the low-strength concrete core sample, so design innovation is needed. Summary of the invention

[0005] The present invention provides a low-strength concrete core sample clamping device with strong practicality and reasonable design and a method using the device. The device and method can solve the problem that the existing method cannot completely and effectively clamp and remove the low-strength concrete core sample.

[0006] The technical solution adopted by the present invention is: a low-strength concrete core sample clamping device, including a metal reaction steel ring sleeved in an annular groove on the side of the concrete core sample in the solid concrete; two wedge-shaped steel inserts are symmetrically arranged between the metal reaction steel ring and the side of the concrete core sample; a downward pressure steel plate, a reaction device and a force-applying device are arranged on the wedge-shaped steel insert in sequence; the reaction device is welded to the metal reaction steel ring and the concrete core sample, the wedge-shaped steel insert, the downward pressure steel plate and part of the force-applying device are covered thereunder. The present invention inserts the wedge-shaped steel insert between the metal reaction steel ring and the side of the concrete core sample, and then clamps the wedge-shaped steel insert and takes out the concrete core sample through the downward pressure steel plate, the reaction device and the force-applying device.

[0007] Furthermore, the annular groove is coaxial with the longitudinal axis of the concrete core sample, the bottom surface is in the same plane as the bottom surface of the concrete core sample, and the top surface is in the same plane as the top surface of the concrete core sample and the surface of the solid concrete.

[0008] Furthermore, the metal reaction steel ring is a hollow cylindrical shape, with the top surface coplanar with the top surface of the concrete core sample, the outer ring diameter is slightly smaller than the outer diameter of the annular groove, the inner ring diameter is slightly larger than the diameter of the concrete core sample, the height is not less than 1 / 3 of the height of the concrete core sample, and the ring wall is symmetrically provided with two facing arc-shaped wedge grooves; the height of the arc-shaped wedge groove is equal to the height of the metal reaction steel ring, the width is 1 / 4 to 1 / 3 of the diameter of the concrete core sample, the top groove thickness is equal to the metal reaction steel ring wall thickness, and the bottom groove thickness is 0.

[0009] Furthermore, the wedge-shaped steel insert is an arc-shaped wedge-shaped body, the top surface of which contacts the lower surface of the lower pressing steel plate, and the lower part can be squeezed into between the arc-shaped wedge-shaped groove and the concrete core sample, the inner wall fits with the outer wall of the concrete core sample, and the outer wall fits with the wall of the arc-shaped wedge-shaped groove. The width is 2mm-4mm smaller than the width of the arc-shaped wedge-shaped groove, and the top surface is at least 20mm higher than the top surface of the concrete core sample.

[0010] Furthermore, the lower pressing steel plate is a rectangular body, with a length greater than the outer-outer distance of the top surface of the wedge-shaped steel insert, a width equal to the width of the wedge-shaped steel insert, and a thickness of not less than 10 mm.

[0011] Furthermore, the reaction device is a concave main body, including a metal reaction beam and two metal reaction feet symmetrically arranged at both ends of the metal reaction beam; the metal reaction beam is a rectangular plate, perpendicular to the lower pressure steel plate and parallel to the top surface of the concrete core sample, with a thickness of not less than 20 mm, a width of 1 / 4 to 1 / 3 of the diameter of the concrete core sample, a length greater than the outer diameter of the annular groove, and force screw holes are drilled through the centers of the top and bottom surfaces, and the bottom surfaces at both ends are vertically welded to the top surfaces of the metal reaction feet; the metal reaction feet are curved rectangular bodies, the bottom surfaces are welded to the top surface of the metal reaction steel ring, the distance between the two parallel rectangles is equal to the width of the metal reaction beam, and the two parallel curved surfaces are respectively the same curved surface as the outer wall and inner wall of the metal reaction steel ring.

[0012] Furthermore, the force-applying device is a hexagonal flat-bottom bolt, which can be screwed into the force-applying screw hole from the top surface of the metal reaction beam to tighten against the upper surface of the lower pressure steel plate.

[0013] The beneficial effects of the present invention are as follows: (1) During the detection process, the wedge-shaped steel insert is inserted into the arc-shaped wedge-shaped groove, and then the steel plate, the reaction device and the force-applying device are pressed down to clamp the concrete core sample and remove it. The invention has strong practicality and reasonable design. (2) The instruments and equipment and spare parts used in the clamping device are all purchased, processed, assembled and carried conveniently, which greatly improves the promotion value. (3) The clamping device has a large length and area for clamping the core sample, and the force is evenly applied. There is no problem that the concrete core sample is pried-shaped and broken at the weak point of force (the edge of the top surface of the concrete core sample) and cannot be completely and effectively clamped and removed. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1It is a front view schematic diagram of the use of the present invention.

[0015] Figure 2 It is a schematic diagram of the AA cross section of the present invention.

[0016] Figure 3 It is a schematic diagram of the BB cross section of the present invention.

[0017] Figure 4 It is a schematic diagram of the CC cross section of the present invention.

[0018] Figure 5 It is a schematic diagram of the DD cross section of the present invention.

[0019] Figure 6 It is a schematic cross-sectional view of the EE used in the present invention.

[0020] Figure 7 It is a schematic diagram of the FF cross section used in the present invention.

[0021] Figure 8 It is a schematic diagram of the GG cross section of the present invention.

[0022] Fig. 9 It is a schematic diagram of a top view of the structure of the present invention.

[0023] Fig.10 It is a schematic diagram of the HH cross section of the structure of the present invention.

[0024] Fig.11 It is a schematic cross-sectional view of Structure II of the present invention. DETAILED DESCRIPTION

[0025] The present invention is further described below in conjunction with specific embodiments, but the present invention is not limited to these specific embodiments. Those skilled in the art should recognize that the present invention covers all possible alternatives, improvements and equivalents within the scope of the claims.

[0026] Reference Figure 1-11 A low-strength concrete core sample clamping device includes a metal reaction steel ring 11 which is sleeved in an annular groove 9 on the side of a concrete core sample 10 in a solid concrete 7; two wedge-shaped steel inserts 6 are symmetrically arranged between the metal reaction steel ring 11 and the side of the concrete core sample 10; a downward pressure steel plate 5, a reaction device 12 and a force-applying device 1 are arranged on the wedge-shaped steel insert 6 in sequence; the reaction device 12 is mounted and welded on the metal reaction steel ring 11 and covers the concrete core sample 10, the wedge-shaped steel insert 6, the downward pressure steel plate 5 and part of the force-applying device 1. The present invention inserts the wedge-shaped steel insert 6 between the metal reaction steel ring 11 and the side of the concrete core sample 10, and then clamps the wedge-shaped steel insert 6 and takes out the concrete core sample 10 through the downward pressure steel plate 5, the reaction device 12 and the force-applying device 1.

[0027] The annular groove 9 described in this embodiment is coaxial with the longitudinal axis of the concrete core sample 10, the bottom surface is in the same plane as the bottom surface of the concrete core sample 10, and the top surface is in the same plane as the top surface of the concrete core sample 10 and the surface of the solid concrete 7; the concrete core sample 10 has a diameter of 120 mm and a height of 150 mm, and the outer diameter of the annular groove is 128 mm.

[0028] The metal reaction steel ring 11 described in this embodiment is a hollow cylindrical shape, with the top surface coplanar with the top surface of the concrete core sample 10, an outer ring diameter of 127.5 mm, an inner ring diameter of 120.5 mm, a height of 70 mm, and two facing arc-shaped wedge grooves 8 symmetrically arranged on the ring wall; the arc-shaped wedge groove 8 is 70 mm high, 35 mm wide, 3.5 mm thick on the top surface, and 0 on the bottom surface.

[0029] The wedge-shaped steel insert 6 described in this embodiment is an arc-shaped wedge-shaped body, the top surface of which contacts the lower surface of the lower pressing steel plate 5, and the lower part can be squeezed into between the arc-shaped wedge-shaped groove 8 and the concrete core sample 10, the inner wall fits with the outer wall of the concrete core sample 10, and the outer wall fits with the wall of the arc-shaped wedge-shaped groove 8, with a width of 32mm and a height of 100mm.

[0030] The lower pressing steel plate 5 described in this embodiment is a rectangular body with a length of 150 mm, a width of 32 mm and a thickness of 12 mm.

[0031] The reaction device 12 described in this embodiment is a concave main body, including a metal reaction beam 3 and two metal reaction legs 4 symmetrically arranged at the two ends of the metal reaction beam 3; the metal reaction beam 3 is a rectangular plate, perpendicular to the lower pressure steel plate 5 and parallel to the top surface of the concrete core sample 10, with a thickness of 22mm, a width of 32mm, and a length of 150mm. A through force screw hole 2 of specification M20 is drilled in the center of the top and bottom surfaces, and the bottom surfaces at both ends are vertically welded to the top surfaces of the metal reaction legs 4; the metal reaction legs 4 are curved rectangular bodies, and the bottom surfaces are welded to the top surface of the metal reaction steel ring 11, the distance between the two parallel rectangles is 32mm, and the two parallel curved surfaces are respectively the same curved surface as the outer wall and the inner wall of the metal reaction steel ring 11.

[0032] The force applying device 1 described in this embodiment is a hexagonal flat bottom bolt of specification M20, which can be screwed into the force applying screw hole 2 from the top surface of the metal reaction force beam 3 to tighten against the upper surface of the lower pressure steel plate 5.

[0033] The use process of this embodiment is as follows: (1) After the concrete core sample 10 is broken, the metal reaction steel ring 11 is placed in the annular groove 9 to cover the concrete core sample 10. At the same time, the reaction device 12 covers the concrete core sample 10 thereunder, and the bottom surface of the metal reaction steel ring 11 is 80 mm away from the top surface of the concrete core sample 10; (2) The wedge-shaped steel insert 6 is inserted into the arc-shaped wedge-shaped groove 8, and the lower pressure steel plate 5 is placed on the top surface of the wedge-shaped steel insert 6; (3) The hexagonal head flat bottom bolt of specification M20 is screwed from the top surface of the metal reaction beam 3 into the force screw hole 2 to the upper surface of the lower pressure steel plate 5 to tighten; (4) The hexagonal head flat bottom bolt is evenly rotated with a wrench to squeeze the wedge-shaped steel insert 6 downward by pressing the lower pressure steel plate 5, and the concrete core sample 10 is firmly clamped and removed.

Claims

1. A low-strength concrete core sample clamping device, characterized in that: It comprises a metal reaction steel ring which is sleeved in an annular groove on the side of a concrete core sample in solid concrete; the annular groove is coaxial with the longitudinal axis of the concrete core sample, the bottom surface is in the same plane as the bottom surface of the concrete core sample, and the top surface is in the same plane as the top surface of the concrete core sample and the surface of the solid concrete; the metal reaction steel ring is a hollow cylindrical shape, the top surface is in the same plane as the top surface of the concrete core sample, the outer ring diameter is slightly smaller than the outer diameter of the annular groove, the inner ring diameter is slightly larger than the diameter of the concrete core sample, the height is not less than 1 / 3 of the height of the concrete core sample, and the ring wall is symmetrically provided with two facing arc-shaped wedge grooves; the height of the arc-shaped wedge groove is equal to the height of the metal reaction steel ring, the width is 1 / 4 to 1 / 3 of the diameter of the concrete core sample, the top surface groove thickness is equal to the metal reaction steel ring wall thickness, and the bottom surface groove thickness is 0; two wedge-shaped steel inserts are symmetrically provided between the metal reaction steel ring and the side of the concrete core sample; The wedge-shaped steel insert is an arc-shaped wedge-shaped body, the top surface of which contacts the lower surface of the lower pressure steel plate, the lower part is squeezed into the arc-shaped wedge-shaped groove and the concrete core sample, the inner wall is in contact with the outer wall of the concrete core sample, the outer wall is in contact with the wall of the arc-shaped wedge-shaped groove, the width is 2mm-4mm less than the width of the arc-shaped wedge-shaped groove, and the top surface is at least 20mm higher than the top surface of the concrete core sample; the lower pressure steel plate, the reaction device and the force-applying device are arranged in sequence on the wedge-shaped steel insert; the reaction device includes a metal reaction beam; the center of the top and bottom surfaces of the metal reaction beam are drilled with through force-applying screw holes; the force-applying device is a hexagonal flat-bottom bolt, which is screwed into the force-applying screw hole from the top surface of the metal reaction beam to tighten on the upper surface of the lower pressure steel plate; the reaction device is mounted and welded on the metal reaction steel ring and the concrete core sample, the wedge-shaped steel insert, the lower pressure steel plate and part of the force-applying device are covered thereunder.

2. A low-strength concrete core sample clamping device according to claim 1, characterized in that: The lower pressing steel plate is a rectangular body, with a length greater than the "outside-outside" distance between the top surfaces of the two wedge-shaped steel inserts, a width equal to the width of the wedge-shaped steel inserts, and a thickness of not less than 10 mm.

3. A low-strength concrete core sample clamping device according to claim 1, characterized in that: The reaction device is a concave main body and also includes two metal reaction feet symmetrically arranged at the two ends of the metal reaction beam; the metal reaction beam is a rectangular plate, perpendicular to the lower pressure steel plate and parallel to the top surface of the concrete core sample, with a thickness of not less than 20 mm, a width of 1 / 4 to 1 / 3 of the diameter of the concrete core sample, and a length greater than the outer diameter of the annular groove. The bottom surfaces at both ends are vertically welded to the top surfaces of the metal reaction feet; the metal reaction feet are curved rectangular bodies, the bottom surfaces of which are welded to the top surface of the metal reaction steel ring, the distance between the two parallel rectangles is equal to the width of the metal reaction beam, and the two parallel curved surfaces are respectively the same curved surface as the outer wall and inner wall of the metal reaction steel ring.

4. A method for using a low-strength concrete core sample clamping device according to any one of claims 1 to 3, characterized in that: The method of use comprises the following steps: (1) after the concrete core sample is broken, the metal reaction steel ring is placed in the annular groove to cover the concrete core sample, and the reaction device covers the concrete core sample thereunder; (2) two wedge-shaped steel inserts are respectively inserted into two arc-shaped wedge-shaped grooves, and the lower pressure steel plate is placed on the top surface of the wedge-shaped steel inserts; (3) the hexagonal flat-bottom bolt is screwed from the top surface of the metal reaction beam into the force screw hole to the upper surface of the lower pressure steel plate to tighten; (4) the hexagonal flat-bottom bolt is evenly rotated with a wrench to squeeze the wedge-shaped steel insert downward by pressing the lower pressure steel plate, and the concrete core sample is firmly clamped and removed.

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