A concrete static compression elastic modulus clamp for measuring bidirectional displacement in real time

Abstract

This utility model relates to the field of civil engineering material performance testing technology, specifically to a real-time concrete static compressive elastic modulus clamp for measuring bidirectional displacement. It includes a concrete specimen fixing device and a displacement measuring device. The fixing device consists of an upper fixing ring, a lower fixing ring, and three positioning guide rods, which are connected in parallel via the upper and lower fixing rings and positioning guide rods. The displacement measuring device includes a vertical displacement measuring component and a horizontal displacement measuring component. The vertical displacement measuring component is a traditional vertical displacement measuring component, while the horizontal displacement measuring component consists of a head steel nut, a semi-threaded rod, a connecting arm, a fully threaded rod, a small steel cylinder, a washer, a clamp, and a tail steel nut. The clamp is hinged to the connecting arm via a universal joint. This utility model can simultaneously and in real-time collect vertical and horizontal displacement information of the concrete specimen under compression, and directly calculate the elastic modulus and Poisson's ratio for each loading stage in a single experiment, significantly improving testing efficiency and data timeliness.

Description

Technical Field

[0001] This utility model relates to the field of civil engineering material performance testing technology, specifically to a concrete static compressive elastic modulus clamp for real-time measurement of bidirectional displacement. Background Technology

[0002] Concrete, as the most widely used building material in modern society, is closely related to people's safety, environment, and life. Therefore, performance testing of concrete is particularly important to ensure the safety of people's lives and property. The modulus of elasticity is a core parameter for measuring a material's resistance to elastic deformation, directly affecting the safety and durability of a structure. Poisson's ratio is an important parameter for predicting crack propagation, plastic deformation, and failure modes. Under dynamic loads such as earthquakes and explosions, Poisson's ratio affects the propagation path and energy dissipation of stress waves, and is closely related to the seismic performance of structures. Therefore, the values ​​of the modulus of elasticity and Poisson's ratio are of great significance to the study of concrete performance.

[0003] Currently, traditional clamps can only measure vertical displacement, and Poisson's ratio needs to be obtained through additional lateral tests or independent equipment, which increases the testing cycle by about 40% and results in poor data consistency. Therefore, in order to achieve simultaneous real-time acquisition of the vertical and lateral displacements of the same concrete standard block, i.e., obtaining multiple parameters in a single experiment, it is necessary to design a clamp for real-time measurement of the static compressive elastic modulus of concrete. Utility Model Content

[0004] The purpose of this invention is to provide a concrete static compressive elastic modulus clamp for real-time measurement of bidirectional displacement, which simultaneously collects the vertical and lateral displacements of the same concrete standard block, shortens the testing cycle, and improves measurement efficiency.

[0005] To achieve the above objectives, this utility model provides a concrete static compressive elastic modulus clamp for real-time measurement of bidirectional displacement, including a concrete specimen fixing device and a real-time displacement measuring device, wherein the real-time displacement measuring device is detachably connected to the concrete specimen fixing device.

[0006] The concrete test block fixing device consists of an upper fixing ring, a lower fixing ring, and three positioning guide rods. The upper fixing ring and the lower fixing ring are arranged in parallel and are detachably connected through the positioning guide rods.

[0007] The real-time displacement measuring device includes a vertical displacement measuring component and a horizontal displacement measuring component. Both the vertical and horizontal displacement measuring components can be detachably connected to a dial indicator. The vertical displacement measuring component is a traditional vertical displacement measuring component. The horizontal displacement measuring component includes a head steel nut, a semi-threaded rod, a connecting arm, a fully threaded rod, a small steel cylinder, a washer, a clamp, and a tail steel nut. The clamp is hinged to the connecting arm via a universal joint. The two ends of the connecting arm are threaded to the semi-threaded rod and the fully threaded rod, respectively. The head steel nut is sleeved on the semi-threaded rod. The fully threaded rod passes through the small steel cylinder and the washer in sequence and is locked by the tail steel nut.

[0008] The three positioning guide rods are respectively located on the three sides of the upper and lower fixed rings and pass through the upper and lower fixed rings.

[0009] The upper fixing ring and the lower fixing ring are each provided with four test block set screws. The four test block set screws are distributed at 90° on the four sides of the upper fixing frame and the lower fixing frame. The upper fixing ring is provided with two holes with a diameter of 8mm at a distance of 70mm from the center line.

[0010] The upper thread of the semi-threaded rod is adapted to the head steel nut, and the lower thread is adapted to the connecting arm. The fully threaded rod is a fully threaded stud.

[0011] The connecting arm is a movable device that can rotate around the central axis of the connecting section in all directions.

[0012] The clamp has a universal joint at the top and a hole at the bottom with a diameter of 8mm.

[0013] This invention provides a real-time clamp for measuring the static compressive elastic modulus of concrete, comprising a concrete specimen fixing device and a displacement measuring device. The fixing device consists of an upper fixing ring, a lower fixing ring, and three positioning guide rods, which are connected in parallel via the upper and lower fixing rings and the positioning guide rods. The displacement measuring device includes a vertical displacement measuring component and a horizontal displacement measuring component. The vertical displacement measuring component is a traditional vertical displacement measuring component, while the horizontal displacement measuring component consists of a head steel nut, a semi-threaded rod, a connecting arm, a fully threaded rod, a small steel cylinder, a washer, a clamp, and a tail steel nut. The clamp is hinged to the connecting arm via a universal joint. This invention can simultaneously and in real-time acquire the vertical and horizontal displacement information of the concrete specimen under compression, and directly calculate the elastic modulus and Poisson's ratio for each loading stage in a single experiment, significantly improving testing efficiency and data timeliness. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the overall structure of a concrete static compressive elastic modulus clamp for real-time measurement of bidirectional displacement according to this utility model.

[0016] Figure 2 This is a schematic diagram of the lateral displacement measuring component of this utility model.

[0017] 1-Upper fixing ring, 2-Lower fixing ring, 3-Positioning guide rod, 4-Transverse displacement measuring component, 41-Head steel nut, 42-Half threaded rod, 43-Connecting arm, 44-Fully threaded rod, 45-Steel small cylinder, 46-Washer, 47-Clamper, 48-Tail steel nut, 5-Test block set screw. Detailed Implementation

[0018] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0019] Please see Figure 1 and Figure 2 This utility model provides a concrete static compressive elastic modulus clamp for real-time measurement of bidirectional displacement, including a concrete specimen fixing device and a real-time displacement measuring device, wherein the real-time displacement measuring device is detachably connected to the concrete specimen fixing device.

[0020] The concrete test block fixing device consists of an upper fixing ring 1, a lower fixing ring 2 and three positioning guide rods 3. The upper fixing ring 1 and the lower fixing ring 2 are arranged in parallel and are detachably connected by the positioning guide rods 3.

[0021] The real-time displacement measuring device includes a vertical displacement measuring component and a horizontal displacement measuring component 4. Both the vertical displacement measuring component and the horizontal displacement measuring component 4 can be detachably connected to a dial indicator. The vertical displacement measuring component is a traditional vertical displacement measuring component, which will not be described in detail in this utility model. Figure 2As shown, the lateral displacement measuring assembly 4 includes a head steel nut 41, a semi-threaded rod 42, a connecting arm 43, a fully threaded rod 44, a small steel cylinder 45, a washer 46, a clamp 47, and a tail steel nut 48. The clamp 47 is hinged to the connecting arm 43 via a universal joint. The two ends of the connecting arm 43 are threadedly connected to the semi-threaded rod 42 and the fully threaded rod 44, respectively. The head steel nut 41 is sleeved on the semi-threaded rod 42. The fully threaded rod 44 passes through the small steel cylinder 45 and the washer 46 in sequence and is locked by the tail steel nut 48.

[0022] The three positioning guide rods 3 are respectively located on the three sides of the upper fixing ring 1 and the lower fixing ring 2, and pass through the upper fixing ring 1 and the lower fixing ring 2, in order to complete the fixation of the test block and the determination of the standard measurement distance.

[0023] The upper fixing ring 1 and the lower fixing ring 2 are each provided with four test block set screws. The four test block set screws are distributed at 90° on the four sides of the upper fixing frame and the lower fixing frame, respectively, for fixing the concrete test block. The upper fixing ring 1 is provided with two holes with a diameter of 8mm at a distance of 70mm from the center line. The corresponding vertical displacement measuring component and horizontal displacement measuring component 4 can be installed through the holes.

[0024] The upper thread of the semi-threaded rod 42 is adapted to the head steel nut 41, and the lower thread is adapted to the connecting arm 43. The fully threaded rod 44 is a fully threaded stud.

[0025] The connecting arm 43 is a movable device that can rotate around the central axis of the connecting section in all directions.

[0026] The clamp 47 has a universal joint at the top and a hole at the bottom with a diameter of 8mm, which is suitable for displacement gauges that can collect displacement information in real time.

[0027] Furthermore, the lateral displacement measuring component 4 uses a universal joint hinge design to ensure that the holder 47 adaptively adjusts its angle when the test block deforms, thus avoiding measurement deviation; the symmetrical mounting hole design of the upper fixing ring 1 ensures that the lateral displacement sensor is precisely aligned with the center line of the test block.

[0028] The specific workflow in this embodiment is as follows:

[0029] Step 1: Remove the lower fixing ring 2 and the upper fixing ring 1.

[0030] Step 2: Install the vertical displacement measuring component and the horizontal displacement measuring component 4 at the hole of the upper fixing ring 1. The vertical displacement measuring component is the same as the traditional one, so it will not be described. The horizontal displacement component 4 is installed as follows: First, connect the connecting arm 43, the fully threaded rod 44 and the half threaded rod 42 and then insert them into the corresponding holes. Fix them with the head steel nut 41. Then install the small steel cylinder 45, the washer 46 and the tail steel nut 48 onto the fully threaded rod 44 in sequence.

[0031] Step 3: Insert the three positioning guide rods 3 into the corresponding guide holes of the upper and lower fixing rings to form the overall frame (see attached image). Figure 1 .

[0032] Step 4: Place the clamp onto the concrete test block, adjust the test block to the center position, and then tighten the four test block set screws 5 to fix the test block.

[0033] Step 5: After determining the position, remove the positioning guide rod 3. The installation of the concrete static compressive elastic modulus test fixture for bidirectional displacement synchronous measurement is complete.

[0034] Step 6: Install a dial indicator on the vertical displacement measuring assembly and clamp 47, apply pressure, and simultaneously read the vertical displacement Δh and lateral displacement Δd. Calculate using the following formula:

[0035]

[0036] Where: E is the elastic modulus, μ is Poisson's ratio, σ is stress, and ε is... h For vertical strain, ε d For lateral strain.

[0037] In summary, unlike traditional clamps, this invention can measure vertical and lateral displacements in real time and calculate the elastic modulus and Poisson's ratio directly through definition. It can obtain two parameters in one experiment, saving time and resources and reducing calculation difficulty. When necessary, it can also be compared with the elastic modulus and Poisson's ratio calculated by other methods to verify the data and improve the accuracy of the data.

[0038] The above description discloses only one or more preferred embodiments of the present utility model, and should not be construed as limiting the scope of the present utility model. Those skilled in the art can understand that implementing all or part of the above embodiments and making equivalent changes in accordance with the claims of the present utility model are still within the scope of the utility model.

Claims

1. A fixture for real-time measurement of the static compressive elastic modulus of concrete for bidirectional displacement, characterized in that, It includes a concrete test block fixing device and a real-time displacement measuring device, wherein the real-time displacement measuring device is detachably connected to the concrete test block fixing device; The concrete test block fixing device consists of an upper fixing ring, a lower fixing ring, and three positioning guide rods. The upper fixing ring and the lower fixing ring are arranged in parallel and are detachably connected through the positioning guide rods. The real-time displacement measuring device includes a vertical displacement measuring component and a horizontal displacement measuring component. Both the vertical and horizontal displacement measuring components can be detachably connected to a dial indicator. The vertical displacement measuring component is a traditional vertical displacement measuring component. The horizontal displacement measuring component includes a head steel nut, a semi-threaded rod, a connecting arm, a fully threaded rod, a small steel cylinder, a washer, a clamp, and a tail steel nut. The clamp is hinged to the connecting arm via a universal joint. The two ends of the connecting arm are threaded to the semi-threaded rod and the fully threaded rod, respectively. The head steel nut is sleeved on the semi-threaded rod. The fully threaded rod passes through the small steel cylinder and the washer in sequence and is locked by the tail steel nut.

2. The concrete static compressive elastic modulus clamp for real-time measurement of bidirectional displacement as described in claim 1, characterized in that, The three positioning guide rods are respectively located on the three sides of the upper and lower fixed rings and pass through the upper and lower fixed rings.

3. The concrete static compressive elastic modulus clamp for real-time measurement of bidirectional displacement as described in claim 2, characterized in that, The upper fixing ring and the lower fixing ring are each provided with four test block set screws. The four test block set screws are distributed at 90° on the four sides of the upper fixing frame and the lower fixing frame. The upper fixing ring is provided with two holes with a diameter of 8mm at a distance of 70mm from the center line.

4. The concrete static compressive elastic modulus clamp for real-time measurement of bidirectional displacement as described in claim 3, characterized in that, The upper thread of the semi-threaded rod is adapted to the head steel nut, and the lower thread is adapted to the connecting arm. The fully threaded rod is a fully threaded stud.

5. The concrete static compressive elastic modulus clamp for real-time measurement of bidirectional displacement as described in claim 4, characterized in that, The connecting arm is a movable device that can rotate around the central axis of the connecting section in all directions.

6. The concrete static compressive elastic modulus clamp for real-time measurement of bidirectional displacement as described in claim 5, characterized in that, The clamp has a universal joint at the top and a hole at the bottom with a diameter of 8mm.

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