Thin-wall sounding pipe total cross-section tensile test clamp

Abstract

The utility model relates to the technical field of thin-wall sounding pipe clamps, and discloses a thin-wall sounding pipe total cross-section tensile test clamp, which comprises an external constraint unit, an internal constraint unit, a tensile test unit and an external constraint unit, wherein the external constraint unit comprises two V-shaped chucks which are symmetrically arranged, and V-shaped openings of the two V-shaped chucks face to the inner side; the internal supporting unit is a plug core capable of being inserted into the thin-wall sounding pipe, the outer diameter of the internal supporting unit is smaller than the inner diameter of the thin-wall sounding pipe, and the internal supporting unit has rigidity; the two V-shaped chucks are located on the two sides of the outer wall of the thin-wall sounding pipe correspondingly and cooperate with the plug core arranged in the thin-wall sounding pipe to clamp the thin-wall sounding pipe. The rigid plug core provides support in the thin-wall sounding pipe and is matched with the inclined surfaces of the V-shaped openings of the two external V-shaped chucks to apply radial constraint so as to form internal and external cooperative clamping, and then a test machine is used for clamping and fixing the clamp clamping the thin-wall sounding pipe, so that a test can be carried out; by means of the clamp design, excessive clamping deformation of the thin-wall sounding pipe can be completely eradicated during clamping, and the anti-slipping performance is remarkably improved.

Description

Technical Field

[0001] This utility model relates to the field of thin-walled acoustic logging tube clamps, and more specifically, to a special magnetic clamp for stretching thin-walled steel acoustic logging tubes used in concrete piles. Background Technology

[0002] During the construction of cast-in-place piles, thin-walled steel sonic logging tubes are placed inside the pile foundation and poured together with the concrete, ultimately forming an integral structure with the pile foundation. During the testing phase, sound waves are emitted into the thin-walled sonic logging tubes after pile completion, and the propagation characteristics of sound waves in the concrete medium (propagation speed, reflection, etc.) are analyzed. By interpreting these sound wave signals, it can be determined whether the concrete inside the pile foundation is uniform and dense, and whether there are quality defects such as voids, cracks, or segregation.

[0003] Therefore, thin-walled sonic logging tubes play an indispensable role in the quality control and acceptance of cast-in-place concrete piles. Their technical requirements are clearly specified in the national standard GB / T 31438-2015, "Steel Thin-Walled Sonic Logging Tubes for Cast-in-Place Concrete Piles," which particularly emphasizes the importance of mechanical performance indicators. These key mechanical performance indicators mainly include tensile strength and elongation after fracture. However, thin-walled sonic logging tubes have significant structural characteristics: their walls are thin (usually around 1.0-2.0 mm) and the entire tube is hollow. Furthermore, according to GB / T 31438-2015, their material is selected from Q195, Q215, or Q235 (grade A or B) steel, which have relatively low strength according to GB / T 700 standard. This combination of "thin wall + low strength" makes the thin-walled sonic logging tube body very prone to deformation under stress.

[0004] When conducting tensile tests to verify mechanical properties, the standard GB / T 2975-2018, "Sampling Location and Specimen Preparation for Mechanical Property Testing of Steel and Steel Products," must be followed. This standard clearly states that, where testing machine capabilities and processing conditions permit, full-section specimens (i.e., the entire pipe section) should be used for testing. However, in reality, the clamps of traditional testing machines cannot directly hold such thin-walled and easily deformable sonic logging pipes; the thin-walled pipes are easily flattened and excessively deformed by the strong clamping force of the testing machine. When the equipment lacks full-section tensile testing capabilities, the conventional alternative is to cut the thin-walled sonic logging pipe into strip specimens for tensile testing and calculation. This cutting process introduces new problems: the high temperature generated during cutting (such as flame cutting or sawing) can cause heat to affect the edge areas of the specimen. The microstructure and mechanical properties of this portion of the metal therefore change, increasing the error in the final tensile test results. This error can sometimes directly affect the determination of product qualification, creating a risk of misjudgment of quality.

[0005] Therefore, in order to accurately evaluate the mechanical properties of thin-walled acoustic tubes (especially when full-section specimens are required), a special fixture for full-section tensile testing of thin-walled acoustic tubes is urgently needed. Utility Model Content

[0006] The present invention aims to overcome at least one of the defects of the prior art and provides a full-section tensile test fixture for thin-walled acoustic logging tubes, which solves the technical problem that the chuck of the testing machine cannot directly clamp the easily deformable thin-walled acoustic logging tubes when testing full-section specimens.

[0007] The technical solution adopted by this utility model is a tensile test fixture for a thin-walled acoustic logging tube, comprising: an external constraint unit including two symmetrically arranged V-shaped clamps, the V-shaped openings of the two V-shaped clamps facing inward; an internal support unit being a plug core that can be inserted into the thin-walled acoustic logging tube, the outer diameter of which is smaller than the inner diameter of the thin-walled acoustic logging tube, and having rigidity; the two V-shaped clamps are respectively located on both sides of the outer wall of the thin-walled acoustic logging tube, and cooperate with the plug core placed inside the thin-walled acoustic logging tube to clamp the thin-walled acoustic logging tube.

[0008] A rigid plug provides support inside the thin-walled acoustic tube, and the V-shaped openings of two external V-shaped clamps apply radial constraints, forming a coordinated internal and external clamping. The clamping device then uses a testing machine to hold and fix the thin-walled acoustic tube in place for testing. This clamping device design completely eliminates excessive clamping deformation of the thin-walled acoustic tube during clamping and significantly improves anti-slip performance, supporting full-section sample testing.

[0009] Furthermore, the plug core is magnetic and can be magnetically attracted to the V-shaped clamp through the thin-walled acoustic tube.

[0010] Furthermore, the inner side of the V-shaped opening of the V-shaped chuck is provided with anti-slip texture, which is a mesh pattern.

[0011] Furthermore, the outer peripheral surface of the plug core is provided with friction texture, which is a spiral texture or an annular texture.

[0012] Furthermore, a handle is fixed to the end of the plug core, and the length of the handle is greater than the diameter of the plug core.

[0013] Furthermore, the outer side of the V-shaped chuck is provided with a ridge, and the outer contour configuration of the ridge is adapted to the chuck of the testing machine.

[0014] Furthermore, the outer periphery of the spine is provided with anti-slip texture.

[0015] Furthermore, the V-shaped opening angle of the V-shaped chuck is between 30° and 150°.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows: a rigid plug core provides support inside the thin-walled acoustic tube, and the V-shaped openings of the two external V-shaped clamps apply radial constraints to form a coordinated internal and external clamping. Then, the clamp holding the thin-walled acoustic tube can be clamped and fixed by a testing machine for testing. This clamp design can completely prevent excessive clamping deformation of the thin-walled acoustic tube during clamping and significantly improve the anti-slip performance, supporting full-section sample testing. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0018] Figure 2 This is a schematic diagram of the present invention being clamped by the two clamps of the testing machine.

[0019] In the picture: 1. V-shaped chuck; 2. Plug core; 3. Handle; 4. Friction texture; 5. Back ridge; 6. Anti-slip texture. Detailed Implementation

[0020] The accompanying drawings are for illustrative purposes only and should not be construed as limiting the scope of this invention. To better illustrate the following embodiments, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0021] like Figure 1 and 2 As shown, this clamping solution is used to hold thin-walled acoustic logging tubes. Its core lies in the use of two external V-shaped clamps 1 and an internal plug core 2 working together to achieve reliable clamping of the thin-walled acoustic logging tubes.

[0022] The V-shaped clamp 1 has a V-shaped opening at its port, with an included angle ranging from 30° to 150°. When clamping a thin-walled acoustic tube with a smaller diameter, the contact point is closer to the inner side of the V-shaped opening; while when clamping a thin-walled acoustic tube with a larger diameter, the contact point moves to the vicinity of the outer end of the V-shaped opening. To prevent slippage between the thin-walled acoustic tube and the V-shaped clamp 1 during clamping, anti-slip texture 6 is provided on the inner side of the V-shaped opening of the V-shaped clamp 1. This anti-slip texture 6 can be a grid pattern or other textures that effectively increase friction.

[0023] The plug core 2 is a key support element inside the clamp, and its surface is machined with friction patterns 4 to increase friction. These friction patterns 4 can be spiral patterns, annular patterns, or other suitable shapes surrounding the outer circumference of the plug core 2. Their core function is to prevent the plug core 2 from slipping out of the thin-walled acoustic tube during testing. The magnetic properties of the plug core 2 are the core of its design. During clamping, it enables the two external V-shaped clamps 1 to be automatically and quickly attracted to the outer wall of the thin-walled acoustic tube. In the clamping state, the two V-shaped clamps 1 mainly apply a constraint force towards the center of the thin-walled acoustic tube to the outside, while the internal plug core 2 provides a reverse support force. The two work together to effectively prevent the thin-walled acoustic tube from being squeezed and deformed excessively.

[0024] To facilitate the placement and removal of the plug core 2, a handle 3 is bolted to one end of the plug core 2. For ease of use, the length of the handle 3 is designed to be greater than the diameter of the plug core 2. This size setting serves two main purposes: first, it facilitates the user's grip and application of force to remove the plug core 2 from the tube; second, it acts as a physical limit to prevent the plug core 2 from becoming completely submerged inside the thin-walled acoustic tube during insertion, thus preventing it from becoming difficult to remove.

[0025] In practical applications, the internal plug core 2 is typically configured in various specifications to meet the requirements of thin-walled acoustic logging tubes of different sizes, such as (but not limited to) diameters of 44mm, 46mm, 50mm, and 52.5mm. The outer diameter range of these plug cores 2 that accommodate thin-walled acoustic logging tubes typically corresponds to 50mm, 53mm, 57mm, and 60mm. It is important to emphasize that the size of the plug core 2 is not necessarily limited to these specifications; the core principle is that the diameter of the plug core 2 should be slightly smaller than the inner diameter of the thin-walled acoustic logging tube to be clamped. Similarly, the V-clamp 1 itself does not have strict dimensional requirements. Its size mainly depends on the specific angle of its V-shaped opening and the size of the thin-walled acoustic logging tube to be clamped, and can be adjusted according to the actual situation, as long as reliable clamping can be achieved.

[0026] During the clamping operation, the magnetic plug 2 is first inserted into the thin-walled acoustic tube. At this time, the two external V-shaped clamps 1 are attracted by the magnetic force and quickly adhere to the outer wall of the thin-walled acoustic tube. It is worth noting that a circular ridge 5 with a diameter of approximately 20mm is provided at the center of the outer side of each V-shaped clamp 1. During the test clamping, the two clamps of the testing machine directly apply clamping force to the ridges 5 of these two V-shaped clamps 1. In this way, the clamping force of the testing machine can be effectively transmitted and converted into a clamping force on the thin-walled acoustic tube. The entire clamping system is simple, effective, and practical. To further enhance clamping stability, anti-slip textures 6 are also provided on the outer circumference of the ridges 5 to prevent relative slippage between the ridges 5 and the testing machine clamps.

[0027] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the technical solution of this utility model, and are not intended to limit the specific implementation of this utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the claims of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A tensile testing fixture for a thin-walled acoustic logging tube across its entire cross-section, characterized in that, include: External constraint unit: includes two symmetrically arranged V-shaped clamps (1), with the V-shaped openings of the two V-shaped clamps (1) facing inward; Internal support unit: is a plug core (2) that can be inserted into the thin-walled acoustic tube, with an outer diameter smaller than the inner diameter of the thin-walled acoustic tube, and has rigidity; Two V-shaped clamps (1) are located on both sides of the outer wall of the thin-walled acoustic tube, and together with the plug core (2) placed inside the thin-walled acoustic tube, they clamp the thin-walled acoustic tube.

2. The tensile testing fixture for a thin-walled acoustic tube across its entire cross-section according to claim 1, characterized in that: The plug core (2) is magnetic and can be magnetically attracted to the V-shaped clamp (1) through the thin-walled acoustic tube.

3. The full-section tensile test fixture for a thin-walled acoustic tube according to claim 1, characterized in that: The V-shaped opening of the V-shaped chuck (1) is provided with anti-slip texture (6), which is a mesh texture.

4. The full-section tensile test fixture for a thin-walled acoustic tube according to claim 1, characterized in that: The outer circumferential surface of the plug core (2) is provided with friction texture (4), which is a spiral texture or an annular texture.

5. A full-section tensile test fixture for a thin-walled acoustic tube according to claim 1, characterized in that: The end of the plug (2) is fixed with a handle (3), and the length of the handle (3) is greater than the diameter of the plug (2).

6. A full-section tensile test fixture for a thin-walled acoustic logging tube according to claim 1, characterized in that: The V-shaped chuck (1) has a spine (5) on its outer side, and the outer contour of the spine (5) is adapted to the test machine chuck.

7. A full-section tensile test fixture for a thin-walled acoustic tube according to claim 6, characterized in that: The outer periphery of the spine (5) is provided with anti-slip texture (6).

8. A tensile testing fixture for a thin-walled acoustic tube across its entire cross-section according to claim 1, characterized in that: The V-shaped opening angle of the V-shaped chuck (1) is between 30° and 150°.

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