A concrete testing device for highway bridge construction

Abstract

This invention discloses a concrete testing device for highway bridge construction, belonging to the field of concrete testing technology. A core rod is installed within the main body, and the core rod also has a sliding hole along its axial direction. A slider and a ball are slidably installed within the sliding hole. A rack is fixed along the length of one side of the core rod, and the rack meshes with the input end of a gear assembly installed within the main body. A winding wheel is fixed to the gear shaft at the output end of the gear assembly, and one end of a pull rope is fixed to the winding wheel. The other end of the pull rope passes through several pulleys and is connected to the other end of the slider. When the core rod retracts within the main body until its end is flush with the end face of the main body, the rack and gear assembly completely separate, causing the ball to be launched towards the exit end of the slider. This invention has a simple structure and is easy to use. Based on the condition that the concrete is in flush contact with the testing device, it can efficiently and quickly trigger an automatic launch and impact test.

Description

Technical Field

[0001] This invention relates to the field of concrete testing, specifically to a concrete testing device for highway bridge construction. Background Technology

[0002] When constructing concrete for roads and bridges, it is often necessary to check whether the concrete strength meets the requirements after construction. Currently, a mainstream device for compressive strength testing of this concrete is the rebound hammer. There are many types of rebound hammers, but most of them directly use a spring to drive a hammer. The hammer bounces on the concrete surface, and the instantaneous elastic deformation caused by the hammer causes a pointer to bounce back, indicating the distance of the rebound. The rebound value is used as one of the indicators related to the compressive strength of the concrete to estimate its compressive strength. In this type of rebound testing device, the timing of the collision requires human intervention to release the hammer or ball, which adds an active energy storage triggering mechanism to the internal structure of the existing testing device, making the structure more complex. Moreover, in the same concrete area, different points and times of testing, if the collision timing is inconsistent, or the position height of the hammer or ball before launch is inconsistent, may lead to inconsistent potential energy accumulation in the ball (hammer). This is inconvenient to use and does not help improve the consistency of the test. Even without considering the requirements of compressive strength accuracy, this cannot guarantee the consistency of potential energy accumulation before collision at all points, even at low precision. In practice, concrete testing typically involves launching several test points within a rectangular array over a specific area. Therefore, it is essential to automatically trigger a collision launch test based on the positional relationship between the concrete and the testing device. Summary of the Invention

[0003] The problem to be solved by the present invention is to provide a concrete testing device for highway bridge construction, which addresses the above-mentioned shortcomings of the prior art and solves the problem that it is difficult to automatically trigger the collision ejection test by relying on the contact between the concrete itself and the testing device.

[0004] To achieve the above objectives, the present invention provides the following technical solution: The present invention provides a concrete testing device for highway bridge construction, including a ball for colliding with the concrete surface, and a body, wherein a core rod is installed in the body, one end of the core rod extends out of the body, and the other end is slidably installed in the body and elastically connected to the body.

[0005] The core rod is also provided with a sliding hole along its axial direction. A slider and the ball are slidably installed in the sliding hole. One end of the slider is used to fix the ball, and the other end of the slider is elastically connected to the inside of the body. A rack is fixed on one side of the core rod along its length. The rack meshes with the input end of a gear assembly installed in the body. A winding wheel is fixed on the gear shaft at the output end of the gear assembly. One end of a pull rope is fixed to the winding wheel. The other end of the pull rope passes around several pulleys and is vertically connected to the other end of the slider. During the process of the core rod retracting into the body, the gear assembly drives the pull rope to pull the slider and the ball in the same direction as the core rod, but at a speed higher than the speed at which the core rod retracts into the body.

[0006] When the core rod retracts into the body until its end is flush with the end face of the body, the rack and the gear assembly are completely separated, causing the ball to bounce toward the exit end of the slider.

[0007] Furthermore, the body has a sliding cavity inside for sliding installation of the core rod, and the core rod has a protruding lug on the side opposite to the rack portion. The lug is connected to the inner top side of the sliding cavity by a first pressure spring.

[0008] Furthermore, the sliding cavity has a blind hole at the center of its inner top, and one end of a second pressure spring is connected to the blind hole. The other end of the second pressure spring extends into the sliding hole and is connected to the other end of the slider.

[0009] Furthermore, a displacement sensor is installed at the center of the bottom of the blind hole. The displacement sensor is used to detect the displacement of the other end of the slider during the rebound of the ball after impacting the concrete.

[0010] Furthermore, a guide rod is slidably passed through the center of the blind hole. One end of the guide rod is coaxially fixed to the slider, and the other end is slidably installed in the body. A marker is fixed perpendicularly to one side of the guide rod. One end of the marker extends out of the body. A scale line is also provided along the length of the notch in the body for the marker to move back and forth. A position plug is also slidably installed in the notch through a telescopic rod.

[0011] Furthermore, the speed-changing gear assembly includes a first gear, a second gear, and a third gear that mesh and drive in sequence, with the winding wheel fixed on the gear shaft of the third gear.

[0012] Compared with the prior art, the present invention has the following beneficial effects: The concrete testing device for highway bridge construction provided by the present invention has a simple and compact structure. When the core rod is pushed back to its limit, it can automatically trigger the elastic ejection and collision of the ball. Taking advantage of the objective condition that the core rod and the end face of the body are flush with the surface of the concrete to be tested during testing, the ejection and collision are cleverly and automatically triggered, ensuring that the potential energy of the ball before the collision with the concrete is relatively consistent. The overall structure is simple and practical, and it is also convenient for rapid testing operations. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the internal structure of the concrete testing device for highway bridge construction of the present invention during the testing process;

[0015] Figure 2 This is a schematic diagram of the internal structure of the concrete testing device for highway bridge construction of the present invention before the testing begins;

[0016] Figure 3 This is a schematic diagram of the internal structure of the concrete testing device for highway bridge construction of the present invention when the core rod is retracted to its limit;

[0017] Figure 4 yes Figure 3 Enlarged view of the structure when the rack section is completely separated from the transmission gear assembly;

[0018] Figure 5 yes Figure 3 Enlarged view of the physical structure when the rack section and the transmission gear assembly are completely separated;

[0019] Figure 6 yes Figure 2 The diagram shown illustrates a structural design using a benchmark.

[0020] Figure 7 It is a magnified view of a specific point on the benchmark.

[0021] The reference numerals in the attached drawings are explained as follows: Body 1, Sliding cavity 101, Blind hole 102, Core rod 2, Sliding hole 201, Rack part 202, Planar section 203, Ear block 204, Ball 3, Slider 4, Gear assembly 5, First gear 501, Second gear 502, Third gear 503, Winding wheel 504, Pull rope 6, First pressure spring 7, Second pressure spring 8, Pulley 9, Displacement sensor 10, Guide rod 11, Marker 12, Position plug 13, Telescopic rod 14, Scale line 15. Detailed Implementation

[0022] To make the technical means, creative features, achieved objectives, and functions of this invention clearer and easier to understand, the technical solution of this invention will be described in detail below. Those skilled in the art should understand that the embodiments described below are merely some specific implementation structures or methods of this invention, and not all embodiments; therefore, the scope of protection of this invention is not limited thereto.

[0023] See Figures 1-3 As shown, this embodiment discloses a concrete testing device for highway bridge construction. Similar to existing rebound hammers, it also includes a bouncing ball 3 for colliding with the concrete surface to obtain test results. Specifically, in this embodiment, the installation and elastic collision structure of the bouncing ball 3 are implemented as follows: it includes a body 1, which can be made into a plate-like structure that is easy to grip. A core rod 2 is installed inside the body 1. The core rod 2 can be a cuboid plate. One end of the core rod 2 extends out of the body 1, and the other end is slidably installed inside the body 1 and elastically connected to the body 1. Under normal conditions, relying on this elastic installation force, most of the core rod 2 extends out of the body 1. Overall, this testing device has a telescopic rod structure.

[0024] More specifically, the core rod 2 is also provided with a sliding hole 201 along its axis. A slider 4 and a ball 3 are slidably mounted within the sliding hole 201. The sliding hole 201 can be a rectangular hole, and the corresponding slider 4 is also a rectangular column structure. One end of the slider 4 is used to fix the ball 3, making the ball 3 and slider 4 an integral structure that moves synchronously. The other end of the slider 4 is elastically connected to the interior of the body 1 through an elastic element, so that after the slider 4 moves into the body 1 within the sliding hole 201, there is always an outward pushing force. As a key structural design in this embodiment, such as... Figure 1 and Figure 4-5As shown, a rack portion 202 is fixed along the length of one side of the core rod 2. This rack portion 202 can be directly the toothed portion of the rack when the core rod 2 is machined into a rack. The toothed portion of the rack-shaped core rod 2 is not fully formed on one side, but has a small gap, forming a planar segment 203. At the same time, as a power transmission, the rack portion 202 meshes with the input end of the gear assembly 5 installed in the main body 1. A winding wheel 504 is fixed on the gear shaft at the output end of the gear assembly 5. One end of the pull rope 6 is fixed to the winding wheel 504. The other end of the pull rope 6 passes around several pulleys 9 and is vertically connected to the other end of the slider 4. During the process of the core rod 2 retracting into the main body 1, the gear assembly 5 drives the pull rope 6, pulling the slider 4 and the ball 3 in the same direction as the core rod 2, but at a speed higher than the speed at which the core rod 2 retracts into the main body 1. When the core rod 2 retracts into the body 1 until its end is flush with the end face of the body 1, the rack portion 202 and the transmission gear assembly 5 completely separate, causing the ball 3 to be launched towards the exit end of the slider 4. In other words, during use, the inspector holds the body 1 and presses the free end of the core rod 2, which is currently extending out of the body 1, against a concrete structure on the side of a road, bridge, or even a guardrail, squeezing the core rod 2 forcefully, causing it to gradually retract into the body 1. At the same time, as the core rod 2 retracts into the body 1, the rack portion 202 on the side drives the transmission gear assembly 5 to rotate, which in turn drives the winding wheel 504 to wind and store the pull rope 6, causing the slider 4 and the ball 3 to move into the body 1 in the same direction as the core rod 2. However, due to the speed increase of the transmission gear assembly 5 and the presence of the winding wheel 504 (which can be made relatively large), the speed at which the slider 4 and the ball 3 move within the core rod 2 is increased. The speed is much higher than the speed at which the core rod 2 slides and retracts within the body 1. Thus, when the end face of the free end of the core rod 2 is flush with the end face of the body 1, the ball 3 has already moved to a position far away from the end face of the core rod 2. At this time, the rack part 202 is completely separated from the transmission gear assembly 5. Under the huge elastic restoring force of the aforementioned elastic element, the ball 3 is launched in a form similar to a steel bullet. Since this concrete testing device is in close contact with the surface of the concrete to be tested and maintains relative contact with the concrete, the ball 3 directly collides with and rebounds from the concrete surface. The amount of rebound represents the test value of the concrete. As for the representation of rebound, this is known in the prior art, and here, we will not elaborate on how to represent it.

[0025] Continue reading Figure 1The main body 1 has a sliding cavity 101 for sliding the core rod 2. The core rod 2 has a protruding lug 204 on the side opposite to the rack portion 202. The lug 204 is connected to the inner top side of the sliding cavity 101 by a first bearing spring 7 to ensure the rapid reset of the core rod 2 after detection. Multiple first bearing springs 7 can also be provided. At the same time, a blind hole 102 can be machined in the center of the inner top of the sliding cavity 101. One end of a second bearing spring 8 is connected to the blind hole 102. This second bearing spring 8 is the aforementioned elastic element. The other end of the second bearing spring 8 extends into the sliding hole 201 and is connected to the other end of the slider 4 to eject the slider 4 and the ball 3 outward. This is the fundamental driving force for the ball 3 during concrete detection.

[0026] As for how to express the relationship between the rebound amount of the ball 3 and the concrete during concrete testing, such as... Figure 1 As shown, a displacement sensor 10 or a distance sensor can be installed in the center of the bottom of the blind hole 102. The displacement sensor 10 is used to detect the displacement of the other end of the slider 4 during the rebound of the ball 3 after impacting the concrete. This comparison directly yields the rebound value of the ball 3 during the rebound, or even during the rebound process.

[0027] In addition, such as Figure 6-7 As shown, a guide rod 11 can also be slidably passed through the center of the blind hole 102. One end of the guide rod 11 is coaxially fixed to the slider 4, and the other end is slidably installed in the body 1. A marker 12 is fixed perpendicularly to one side of the guide rod 11. One end of the marker 12 extends out of the body 1. A scale line 15 is also opened along the length direction at the notch in the body 1 for the marker 12 to move back and forth. A position plug 13 is also slidably installed in the notch through a telescopic rod. It can be seen directly that the position plug 13 is located when the marker 12 is pushed to the farthest position. Usually, the position plug 13 stays at the farthest end when pushed by the marker 12. This is the rebound amount of the ball 3, which is used to characterize the concrete test result.

[0028] Whether using displacement sensor 10 or mechanical marker 12 for recording, standard concrete can be used for detection, recording the corresponding displacement or scale line 15. This sampling and direct comparison allows for assessment of the object's compliance. Alternatively, existing design parameters can be used to determine implementation. For the transmission gear assembly 5, as... Figure 4One of the simplest structures includes a first gear 501, a second gear 502, and a third gear 503 that mesh sequentially. These three gears achieve speed change while ensuring the consistency of the movement direction between the core rod 2 and the ball 3. A winding wheel 504 is fixed on the gear shaft of the third gear 503. At a certain rotational speed, the larger the winding wheel 504, the greater the linear velocity, and the greater the velocity of the ball 3 relative to the core rod 2. Therefore, when the core rod 2 retracts to its limit, it can compress the second pressure spring 8 more, obtaining greater test potential energy. Furthermore, based on existing rebound spring technology, this invention can also be combined with digital displays and other accessories to obtain a corresponding easy-to-read structure. This invention aims to protect the structural design for the accumulation and release of the ball's potential energy. Those skilled in the art can make practical new extensions based on this design to improve the device's functionality.

[0029] It should be reiterated that, in this invention, the terms "comprising," "including," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Therefore, those skilled in the art should understand that any modifications or equivalent substitutions made by those skilled in the art to this embodiment based on the technical principles disclosed in this invention, without departing from the technical spirit of this invention, should be included within the scope of protection of this invention.

Claims

1. A concrete testing device for highway bridge construction, comprising a ball (3) for colliding with the concrete surface, characterized in that: It also includes a body (1), in which a core rod (2) is installed. One end of the core rod (2) extends out of the body (1), and the other end is slidably installed in the body (1) and elastically connected to the body (1). The core rod (2) is also provided with a sliding hole (201) in the axial direction. A slider (4) and the ball (3) are slidably installed in the sliding hole (201). One end of the slider (4) is used to fix the ball (3), and the other end of the slider (4) is elastically connected to the inside of the body (1). A rack part (202) is fixed on one side of the core rod (2) along its length direction. The rack part (202) meshes with the input end of the speed-changing gear assembly (5) installed in the body (1) for transmission. The output of the speed-changing gear assembly (5) is... A winding wheel (504) is fixed on the gear shaft at the end. One end of a pull rope (6) is fixed to the winding wheel (504). The other end of the pull rope (6) passes around several pulleys (9) and is vertically connected to the other end of the slider (4). During the process of the core rod (2) retracting into the body (1), the pull rope (6) is driven by the speed-changing gear assembly (5) to pull the slider (4) and the ball (3) in the same direction as the core rod (2), but at a speed higher than the speed at which the core rod (2) retracts into the body (1). When the core rod (2) retracts into the body (1) until its end is flush with the end face of the body (1), the rack part (202) and the gear assembly (5) are completely separated, causing the ball (3) to be ejected toward the outlet end of the slider (4).

2. The concrete testing device for highway bridge construction according to claim 1, characterized in that: The body (1) has a sliding cavity (101) for sliding mounting of the core rod (2). The core rod (2) has a protruding ear block (204) on the side away from the rack portion (202). The ear block (204) is connected to the inner top side of the sliding cavity (101) by a first pressure spring (7).

3. The concrete testing device for highway bridge construction according to claim 2, characterized in that: The sliding cavity (101) has a blind hole (102) at the center of its inner top. One end of a second pressure spring (8) is connected to the blind hole (102), and the other end of the second pressure spring (8) extends into the sliding hole (201) and is connected to the other end of the slider (4).

4. The concrete testing device for highway bridge construction according to claim 3, characterized in that: A displacement sensor (10) is installed at the center of the bottom of the blind hole (102). The displacement sensor (10) is used to detect the displacement of the other end of the slider (4) during the rebound of the ball (3) after impacting the concrete.

5. The concrete testing device for highway bridge construction according to claim 3, characterized in that: A guide rod (11) slides through the center of the blind hole (102). One end of the guide rod (11) is coaxially fixed to the slider (4), and the other end is slidably installed in the body (1). A marker (12) is fixed perpendicularly to one side of the guide rod (11). One end of the marker (12) extends out of the body (1). A scale line (15) is also provided along the length of the notch in the body (1) for the marker (12) to move back and forth. A position plug (13) is also slidably installed in the notch through a telescopic rod.

6. The concrete testing device for highway bridge construction according to claim 1, characterized in that: The gear assembly (5) includes a first gear (501), a second gear (502), and a third gear (503) that mesh and drive in sequence, and the winding wheel (504) is fixed on the gear shaft of the third gear (503).

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