A concrete cracking apparatus

Abstract

The utility model provides a kind of concrete crack expansion determination device, including pouring box, pouring box is installed on the top of bottom plate, the bottom of bottom plate is equipped with shaking plate, buffering assembly is arranged between shaking plate and bottom plate, buffering assembly includes buffer and vibrating piece, the number of buffer is multiple, buffer includes buffer spring.The utility model has the beneficial effect as follows, cooperate the elastic connection of buffer spring, ensure that the vibration effect of bottom plate is better, so that the pouring concrete in pouring box is vibrated, so that it is poured flat and solid, avoid the internal gas or bubble of the poured concrete, the pouring box of subsequent pouring concrete is split, the concrete test block after form removal is directly placed in field environment, avoid the internal gas of concrete, so as to affect its determination accuracy, so as to directly evaluate the crack resistance of concrete.

Description

Technical Field

[0001] This utility model is a concrete cracking and expansion measuring device, belonging to the field of concrete measurement technology. Background Technology

[0002] Concrete shrinkage refers to the reduction in volume of concrete during setting, hardening, and service due to changes in internal moisture, temperature, and chemical reactions. Generally, concrete shrinkage deformation behavior includes plastic settlement shrinkage and autogenous shrinkage in the initial pouring stage, as well as subsequent shrinkage due to environmental factors such as drying shrinkage, temperature deformation, and carbonation shrinkage. Concrete shrinkage and the resulting cracking are among the main factors affecting the volume stability and structural durability of concrete. With the increasing application of high-performance concrete with low water-cement ratios in engineering projects, the civil engineering community is paying close attention to concrete cracking caused by shrinkage.

[0003] High-altitude regions are characterized by strong winds and dryness, which greatly increases the likelihood of cracking in concrete structures. However, construction sites often lack the conditions to test the crack resistance of concrete structures. Therefore, a device for determining the early crack resistance of concrete in windy and dry environments, patent number CN201620846068.6, describes a method that utilizes stress concentration at the top of a crack-inducing block to increase the likelihood of cracks. This device can evaluate the cracking performance of concrete by analyzing the time and morphology of cracks appearing on the surface of concrete specimens. Especially in windy and dry areas, it allows for the direct evaluation of the crack resistance of concrete by placing demolded concrete specimens directly in the field environment, demonstrating promising application prospects.

[0004] This patent involves adding crack-inducing blocks to the poured concrete beforehand, and then placing the concrete in a windy and dry environment for testing. However, this patent involves placing the poured concrete blocks statically after pouring, which cannot effectively eliminate the air or air bubbles contained in the concrete blocks. After hardening, the concrete still contains these air or air bubbles. Subsequent testing in a windy and dry environment will result in inaccurate measurement results due to the air or air bubbles contained in the concrete blocks. Therefore, this utility model proposes a concrete crack expansion testing device that can vibrate and compact concrete blocks. Utility Model Content

[0005] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a concrete cracking and expansion measuring device.

[0006] To achieve the above objectives, this utility model is implemented through the following technical solution:

[0007] A concrete cracking and expansion measuring device includes a pouring box, which is installed on the top of a base plate. A swaying plate is provided at the bottom of the base plate. A buffer assembly is provided between the swaying plate and the base plate. The buffer assembly includes a buffer element and a vibrating element. There are multiple buffer elements. The buffer element includes a buffer spring. The top and bottom ends of the buffer spring are fixed with mounting plates. The mounting plates are fixed between the base plate and the swaying plate with screws. The vibrating element includes a vibration motor, which is installed at the bottom end of the base plate.

[0008] Furthermore, a telescopic rod is fixed between the mounting plates, and the telescopic rod is arranged inside the buffer spring.

[0009] Furthermore, pulleys are arranged at the four corners of the bottom of the rocking plate, and the rocking plate is located inside the fixed base. The inner side of the fixed base is provided with pulley grooves to match the pulleys.

[0010] Furthermore, multiple secondary buffer assemblies are installed between the inner side of the fixed base and the outer side wall of the rocking plate. The secondary buffer assemblies include secondary buffer springs, and secondary mounting plates are fixed between the secondary buffer springs. The secondary mounting plates are fixed to the fixed base and the rocking plate with screws.

[0011] Furthermore, a rotary motor is also fixed on the fixed base, and an elliptical plate is provided at the output top of the rotary motor, which corresponds to the rocking plate.

[0012] Furthermore, the casting box includes four side plates and a support plate. Each corner of the support plate is fixed with a mounting plate, which is fixed to the top of the base plate with screws. The four side plates are fixed together with screws. Two of the side plates are fixed with auxiliary mounting plates on both sides of the bottom end, which are fixed to the outer wall of the support plate with screws.

[0013] Furthermore, a cylindrical steel block of the same height is set inside the casting box. Multiple crack induction plates of the same height are fixedly set on the outer surface of the cylindrical steel block along its circumference. An integrally formed insertion rod is fixedly set at the middle of the bottom end of the cylindrical steel block. An insertion hole corresponding to the insertion rod is opened on the top surface of the support plate.

[0014] Furthermore, the mounting base is equipped with two timer switches, which are connected to the rotary motor and the vibration motor, respectively.

[0015] The beneficial effects of this utility model are:

[0016] By setting up a casting box, concrete is poured into the casting box. After pouring, the buffer assembly is activated, specifically the vibration motor. Because a buffer spring is installed between the base plate and the shaking plate, the vibration motor vibrates the base plate. The elastic connection of the buffer spring ensures a better vibration effect on the base plate. This completes the vibration of the concrete inside the casting box, making the concrete pouring flat and preventing the concrete from containing gas or air bubbles. Subsequently, the casting box is disassembled, and the demolded concrete test blocks are placed directly in the field environment to avoid the presence of gas inside the concrete, which would affect the accuracy of the test and thus directly evaluate the crack resistance of the concrete.

[0017] The process can be carried out using ordinary concrete test molds on-site. Stress concentration is formed at the top of the crack induction block, thereby increasing the likelihood of cracks. The device can evaluate the cracking performance of concrete by analyzing the time and morphology of cracks appearing on the surface of the concrete specimen. In windy and dry areas, the demolded concrete test blocks can be placed directly in the on-site environment to directly evaluate the crack resistance of concrete. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments 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.

[0019] Figure 1 This is a front view of a concrete cracking and swelling measuring device according to the present invention;

[0020] Figure 2 This is a schematic diagram of the buffer component of a concrete cracking and swelling measuring device according to the present invention;

[0021] Figure 3 This is a schematic diagram showing the distribution of the buffer component and the auxiliary buffer component of a concrete cracking and swelling measuring device according to this utility model;

[0022] Figure 4 This is a schematic diagram of the pouring box of a concrete cracking and swelling measuring device according to the present invention.

[0023] In the diagram, 1. Casting box; 2. Base plate; 3. Shaking plate; 4. Buffer spring; 5. Mounting plate; 6. Vibration motor; 7. Telescopic rod; 8. Pulley; 9. Fixed base; 10. Pulley groove; 11. Secondary buffer spring; 12. Secondary mounting plate; 13. Elliptical plate; 14. Side plate; 15. Support plate; 16. Mounting piece; 17. Secondary mounting piece; 18. Cylindrical steel block; 19. Crack induction plate; 20. Insertion hole; 21. Timer switch. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Please see Figure 1-3 This utility model provides a concrete crack expansion measuring device, including a pouring box 1, which is installed on the top of a base plate 2. A shaking plate 3 is provided at the bottom of the base plate 2. A buffer assembly is provided between the shaking plate 3 and the base plate 2. The buffer assembly includes a buffer element and a vibrating element. There are multiple buffer elements. The buffer element includes a buffer spring 4. The top and bottom ends of the buffer spring 4 are fixedly provided with mounting plates 5. The mounting plates 5 are fixed between the base plate 2 and the shaking plate 3 with screws. The vibrating element includes a vibration motor 6, which is installed at the bottom end of the base plate 2. A cylindrical steel block 18 with the same height is provided inside the pouring box 1. Multiple crack induction plates 19 with the same height are fixedly provided on the outer surface of the cylindrical steel block 18 along its circumference.

[0026] See Figure 1-3 A telescopic rod 7 is fixed between the mounting plates 5. The telescopic rod 7 is arranged inside the buffer spring 4. The setting of the telescopic rod ensures that the buffer spring has a unidirectional telescopic movement.

[0027] See Figure 1 and Figure 3 The swaying plate 3 has pulleys 8 arranged at its four corners. The swaying plate 3 is located inside the fixed base 9. The inner side of the fixed base 9 has pulley grooves 10 to match the pulleys 8. Multiple secondary buffer components are installed between the inner side of the fixed base 9 and the outer wall of the swaying plate 3. Each secondary buffer component includes a secondary buffer spring 11, with a secondary mounting plate 12 fixed between the secondary buffer springs 11. The secondary mounting plate 12 is fixed to the fixed base 9 and the swaying plate 3 with screws. A rotary motor is also fixed to the fixed base 9. An elliptical plate 13 is located at the top of the output of the rotary motor, corresponding to the swaying plate 3. When the rotary motor is turned on, the elliptical plate 13 rotates, striking the swaying plate 3 and causing it to sway, thus vibrating the swaying plate 3 and further enhancing the compaction effect of the concrete. The secondary buffer components are also equipped with telescopic rods.

[0028] See Figure 1 and Figure 4The casting box 1 includes four side plates 14 and a support plate 15. Each corner of the support plate 15 is fixed with an installation piece 16, which is fixed to the top of the base plate 2 with screws. The four side plates 14 are fixed with screws. Two of the side plates 14 are fixed with auxiliary installation pieces 17 on both sides of their bottom ends. The auxiliary installation pieces 17 are fixed to the outer wall of the support plate 15 with screws. An integrally formed insertion rod is fixed in the middle of the bottom end of the cylindrical steel block 18. The top surface of the support plate 15 has an insertion hole 20 corresponding to the insertion rod. The fixing base 9 is equipped with two timer switches 21, which are connected to a rotary motor and a vibration motor respectively. The timer switches 21 turn on the rotary motor and the vibration motor at regular intervals. When the workers need to pour concrete, they can turn on the timer switches 21 again. After that, they do not need to keep an eye on the measuring device. After the concrete hardens, the demolded concrete test block is placed directly in the field environment.

[0029] In use, concrete is poured into the pouring box 1. After pouring, the buffer assembly is activated, specifically the vibration motor 6. Because a buffer spring 4 is installed between the base plate 2 and the shaking plate 3, the vibration motor 6 vibrates the base plate 2. The elastic connection of the buffer spring ensures a better vibration effect on the base plate 2, thus completing the vibration of the concrete poured into the pouring box 1, making the concrete pouring flat and avoiding the presence of gas or air bubbles inside the poured concrete. Subsequently, the pouring box 1 is disassembled, and the demolded concrete test blocks are placed directly in the field environment to avoid the presence of gas inside the concrete, which would affect the accuracy of the test. This allows for direct evaluation of the crack resistance of the concrete. Ordinary concrete test molds can be used in engineering sites. Stress concentration is formed at the top of the crack induction block, increasing the possibility of cracks. The device can evaluate the cracking performance of concrete by analyzing the time and morphology of cracks appearing on the surface of the concrete specimen. In windy and dry areas, the demolded concrete test blocks can be placed directly in the field environment to directly evaluate the crack resistance of the concrete.

[0030] Specifically, the connection structure of the timer switch 21, the rotary motor, and the vibrating motor is well known to those skilled in the art and will not be described in detail here. The timer switch 21, the rotary motor, and the vibrating motor are all connected to an external power source during use. The timer switch 21, the rotary motor, and the vibrating motor involved are existing technologies and can be fully implemented by those skilled in the art, so they will not be described in detail here.

[0031] Although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A device for measuring concrete cracking and expansion, characterized in that, It includes a casting box (1), which is installed on the top of the base plate (2). The bottom of the base plate (2) is provided with a swaying plate (3). A buffer assembly is provided between the swaying plate (3) and the base plate (2). The buffer assembly includes a buffer component and a vibration component. The number of buffer components is multiple. The buffer components include buffer springs (4). The top and bottom ends of the buffer springs (4) are fixed with mounting plates (5). The mounting plates (5) are fixed between the base plate (2) and the shaking plate (3) with screws. The vibration components include vibration motors (6). The vibration motors (6) are installed at the bottom end of the base plate (2). A cylindrical steel block (18) with the same height is set inside the casting box (1). Multiple crack induction plates (19) with the same height are fixed on the outer surface of the cylindrical steel block (18) along its circumference.

2. The concrete cracking and swelling measuring device according to claim 1, characterized in that, Telescopic rods (7) are fixed between the mounting plates (5) and are arranged inside the buffer springs (4).

3. The concrete cracking and swelling measuring device according to claim 2, characterized in that, The bottom of the swaying plate (3) is equipped with pulleys (8) at all four corners. The swaying plate (3) is located inside the fixed seat (9). The inner side of the fixed seat (9) is provided with pulley grooves (10) that match the pulleys (8).

4. The concrete cracking and swelling measuring device according to claim 3, characterized in that, Multiple secondary buffer assemblies are installed between the inner side of the fixed seat (9) and the outer side of the rocking plate (3). The secondary buffer assemblies include secondary buffer springs (11), and secondary mounting plates (12) are fixed between the secondary buffer springs (11). The secondary mounting plates (12) are fixed to the fixed seat (9) and the rocking plate (3) with screws.

5. The concrete cracking and swelling measuring device according to claim 4, characterized in that, A rotary motor is also fixed on the fixed base (9), and an elliptical plate (13) is provided at the top of the output of the rotary motor. The elliptical plate (13) corresponds to the rocking plate (3).

6. The concrete cracking and swelling measuring device according to claim 5, characterized in that, The casting box (1) includes four side plates (14) and a support plate (15). The support plate (15) is fixed with mounting pieces (16) at its corners. The mounting pieces (16) are fixed to the top of the base plate (2) with screws. The four side plates (14) are fixed with screws. Two of the side plates (14) are fixed with auxiliary mounting pieces (17) on both sides of their bottom ends. The auxiliary mounting pieces (17) are fixed to the outer side wall of the support plate (15) with screws.

7. The concrete cracking and swelling measuring device according to claim 6, characterized in that, An integrally formed insertion rod is fixed at the middle of the bottom end of the cylindrical steel block (18), and an insertion hole (20) corresponding to the insertion rod is opened on the top surface of the support plate (15).

8. The concrete cracking and swelling measuring device according to claim 7, characterized in that, Two timer switches (21) are provided on the fixed base (9), and the timer switches (21) are connected to the rotary motor and the vibration motor respectively.

Images