An apparatus for making a fracture test specimen

Abstract

This utility model discloses a testing device for fabricating crack specimens, including a fixed support, a molding die, a crack forming component, and a traction device. The fixed support can be placed on the ground or a molding vibration table. The fixed support has an installation position. The molding die is placed in the installation position and serves as a mold for forming the crack specimen. The crack forming component is arranged to a predetermined depth within the molding die. The traction device is mounted on the fixed support and connected to the crack forming component for adjusting its height. This testing device for fabricating crack specimens can improve the quality of crack specimen fabrication, ensuring that the cracks in the specimens meet the requirements for conducting crack leakage treatment tests.

Description

Technical Field

[0001] This utility model belongs to the field of building technology, and specifically relates to a test device for making crack specimens. Background Technology

[0002] With the acceleration of urbanization and the continuous expansion of underground space development, water leakage problems in concrete structures such as subway tunnels, integrated utility tunnels, and underground commercial buildings are becoming increasingly prominent. Under complex geological environments and water pressure, cracks in concrete structures caused by factors such as material shrinkage, temperature stress, construction defects, or external loads become the main channels for water leakage.

[0003] Currently, water leakage control mainly relies on grouting sealing technology. However, in actual engineering projects, the effectiveness of crack leakage control varies greatly depending on the type of leakage control materials used. Therefore, evaluating the effectiveness of crack leakage control in concrete structures is crucial. Pre-fabrication of concrete structure cracks is a prerequisite for conducting crack leakage control tests. This pre-fabrication of cracks can be referred to as the fabrication of "crack specimens." Currently, due to a lack of reliable technical methods for fabricating crack specimens, the pre-fabricated specimens often exhibit uneven crack patterns and some cracks are not continuous, failing to achieve the expected results and making it difficult to conduct crack leakage control tests. Furthermore, traditional pre-fabrication techniques for crack specimens are relatively outdated and often involve significant manpower costs.

[0004] Currently, there is a lack of a dedicated testing device for preparing crack specimens to improve the quality of crack specimen preparation and ensure that the cracks in the prepared specimens meet the requirements for conducting experiments.

[0005] Therefore, a new technology is needed to address the lack of a testing device specifically designed for fabricating crack specimens in existing technologies. Utility Model Content

[0006] To address the aforementioned problems in the prior art, this utility model provides a testing device for fabricating crack specimens, which can improve the fabrication quality of crack specimens and ensure that the cracks in the specimens meet the requirements for conducting crack leakage treatment tests.

[0007] The present invention adopts the following technical solution:

[0008] A testing apparatus for fabricating crack specimens includes a fixed support, a molding die, a crack forming structure, and a traction device. The fixed support can be placed on the ground or on a molding vibration table. The fixed support has an installation position. The molding die is disposed at the installation position and serves as a mold for forming crack specimens. The crack forming structure is disposed at a predetermined depth within the molding die. The traction device is disposed on the fixed support and is connected to the crack forming structure for adjusting the height of the crack forming structure.

[0009] Furthermore, the crack forming structure is a plate.

[0010] Furthermore, the plate is provided with a connecting hole, through which the plate can be connected to a pull rope.

[0011] Furthermore, the board is a rigid PVC sheet.

[0012] Furthermore, the molding die is an ABS plastic molding die.

[0013] Furthermore, the traction device is a motor; the motor is connected to the crack forming structure via a pull rope and is used to adjust the height position of the crack forming structure.

[0014] Furthermore, the testing device also includes a limiting and fixing assembly; the limiting and fixing assembly includes a clamping member and a limiting member; one end of the clamping member is fixed to the fixed bracket through the limiting member, and the other end of the clamping member can press against the molding die to limit and fix the molding die.

[0015] Furthermore, the tightening member is a tightening rod with a threaded portion; the limiting member is a nut; the nut can be disposed on the threaded portion; one end of the tightening rod is adjustablely connected to the fixed bracket through the nut.

[0016] Furthermore, the test apparatus also includes a grouting pipe; the grouting pipe is disposed on the crack forming structure and can be arranged to penetrate into the forming mold to a set depth as the crack forming structure penetrates into the forming mold.

[0017] Furthermore, the test apparatus also includes a water injection pipe; the water injection pipe is disposed on the crack forming structure and can be arranged to penetrate into the forming mold to a set depth as the crack forming structure penetrates into the forming mold.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0019] This utility model discloses a test device for making crack specimens. The mounting position of the fixed bracket provides a stable position for the placement of the molding mold. The molding mold is used as a mold for molding the crack specimen. In order to create cracks in the crack specimen, the crack forming component can be arranged to a set depth in the molding mold according to actual needs. Then, specimen material (such as concrete) is poured into the molding mold. When the specimen material is close to initial setting, the crack forming component is slowly pulled out of the molding mold by a traction device. In this way, the high-quality construction of cracks in the crack specimen is achieved. The final crack specimen can meet the requirements for conducting crack leakage treatment tests.

[0020] This invention relates to a testing device for preparing crack specimens, which can improve the quality of crack specimen preparation and enable the cracks in the specimens to meet the requirements for conducting crack leakage treatment tests. Attached Figure Description

[0021] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0022] Figure 1 This is a three-dimensional schematic diagram of the present invention, "An experimental device for making crack specimens" (the traction device in the figure is simplified). (The threaded part and the nut can be understood in conjunction with existing threads and nuts).

[0023] Figure 2 This is a 3D schematic diagram of the fixed bracket;

[0024] Figure 3 It is a three-dimensional schematic diagram of the molding die;

[0025] Figure 4 It is a three-dimensional schematic diagram of the crack forming structure;

[0026] Figure 5 This is a three-dimensional schematic diagram of the cracked specimen (obtained from the present invention "An experimental device for making cracked specimens").

[0027] Figure label:

[0028] 1-Fixed bracket; 11-Base plate; 111-Mounting position; 12-Frame; 121-Top; A-Through hole;

[0029] 2- Molding mold; 21- Groove;

[0030] 3-Crack forming structure; 31-Connecting hole;

[0031] 4-Traction device;

[0032] 5-Limit fixing assembly; 51-Tightening rod; 511-Threaded part; 52-Nut;

[0033] 6- Grouting pipe;

[0034] 7-Water injection pipe;

[0035] 8-Pull rope;

[0036] 9-Cracked specimen; 91-Crack; 92-Grouting hole; 93-Water injection hole. Detailed Implementation

[0037] The following will provide a clear and complete description of the concept, specific structure, and technical effects of this utility model in conjunction with the embodiments and accompanying drawings, so as to fully understand the purpose, solution, and effects of this utility model. It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The same reference numerals used throughout the drawings indicate the same or similar parts.

[0038] It should be noted that, unless otherwise specified, when a feature is referred to as "fixed" or "connected" to another feature, it can be directly fixed or connected to the other feature, or it can be indirectly fixed or connected to the other feature. Furthermore, the descriptions of "upper," "lower," "left," and "right" used in this utility model are only relative to the relative positional relationships of the various components of this utility model in the accompanying drawings.

[0039] Reference Figures 1 to 5 A testing apparatus for fabricating crack specimens includes a fixed support 1, a molding die 2, a crack forming component 3, and a traction device 4. The fixed support 1 can be placed on the ground or on a molding vibration table. The fixed support 1 is provided with an installation position 111. The molding die 2 is disposed on the installation position 111 and is used as a mold for forming crack specimens 9. The crack forming component 3 can be disposed to a predetermined depth into the molding die 2. The traction device 4 is disposed on the fixed support 1 and is connected to the crack forming component 3 for adjusting the height position of the crack forming component 3.

[0040] Reference Figure 1 and Figure 2 In one embodiment, the fixed bracket 1 is a steel fixed bracket, which is not easily deformed and can be moved at any time.

[0041] Reference Figure 1 and Figure 2In one embodiment, the fixed bracket 1 includes a base plate 11 and a frame 12; the frame 12 is disposed on the base plate 11, and the mounting position 111 is formed on the base plate 11. The frame 12 has an open layout at the front (e.g., front) and the back (e.g., back), which is conducive to the operator placing the molding mold 2 on the mounting position 111 and also conducive to the operator removing the molding mold 2 from the mounting position 111.

[0042] Reference Figure 1 and Figure 4 In one embodiment, the crack forming structure 3 is a plate.

[0043] Reference Figure 1 and Figure 4 In one embodiment, the plate is provided with a connection hole 31, through which the plate can be connected to the pull rope 8.

[0044] Reference Figure 1 and Figure 4 In one embodiment, the board is a rigid PVC sheet, which is easy to cut and facilitates the drilling of holes (such as connection holes 31) in the board. "PVC" stands for "Polyvinyl Chloride". The board described in this invention is not limited to this rigid PVC sheet; in practice, boards of other materials can be selected according to requirements.

[0045] In one embodiment, the molding die 2 is an ABS plastic molding die, which is detachably mounted on the fixed bracket 1. The ABS plastic molding die facilitates the demolding of the cracked specimen 9, such as a "cracked concrete block". The full English name of "ABS" is "Acrylonitrile Butadiene Styrene".

[0046] In one embodiment, the traction device 4 is a motor; the motor is connected to the crack forming component 3 via a pull rope 8, used to adjust the height of the crack forming component 3. For example, before the crack specimen 9 is made, the operator can use the motor and pull rope 8 to lower the crack forming component 3 into the set depth of the groove 21 of the forming mold 2, so as to facilitate the subsequent production of the required crack 91. As another example, after the crack specimen 9 is formed, the operator can use the motor and pull rope 8 to pull the crack forming component 3 out of the groove 21 of the forming mold 2, finally completing the production of the crack specimen 9 and its crack 91. Preferably, the motor mentioned in this embodiment can be a small-sized motor with high torque. Preferably, the pull rope 8 mentioned in this embodiment can be a nylon rope or a steel wire rope.

[0047] Reference Figure 1 In one embodiment, the testing device further includes a limiting and fixing component 5; the limiting and fixing component 5 includes a clamping member and a limiting member; one end of the clamping member is adjustablely fixed to the fixing bracket 1 through the limiting member, and the other end of the clamping member can press against the molding mold 2 for limiting and fixing the molding mold 2.

[0048] Reference Figure 1 In one embodiment, the tightening member is a tightening rod 51 with a threaded portion 511; the limiting member is a nut 52; the nut 52 can be disposed on the threaded portion 511; one end of the tightening rod 51 is adjustablely connected to the fixed bracket 1 through the nut 52. Specifically, one end of the tightening rod 51 is provided with a threaded portion 511, and a first nut is fitted on the threaded portion 511. The threaded portion 511 passes through the through hole A of the top 121 of the frame 12 of the fixed bracket 1, and the first nut is located below the top 121 of the frame 12. A second nut is also provided on the threaded portion 511, and the second nut is located above the top 121 of the frame 12. The tightening rod 51 can be fixed to the frame 12 of the fixed bracket 1 by the first nut and the second nut. At the same time, the tightening rod 51 can be locked on the threaded portion 511 at different positions by the first nut and the second nut, so that the height can be adjusted. Thus, by adjustment, the tightening rod 51 (pressing down) can tighten the molding mold 2, thereby stably fixing the molding mold 2 in the mounting position 111 of the fixed bracket 1, which facilitates the pouring of test material (such as concrete) into the groove 21 of the molding mold 2. When it is necessary to remove the molding mold 2, the positions of the first nut and the second nut are readjusted to release the limiting effect of the top clamping rod 51 on the molding mold 2, so that the operator can remove the molding mold 2.

[0049] Reference Figure 1 Preferably, the clamping rod 51 is a steel clamping rod, which is not easily deformed and has strong fixing ability.

[0050] Reference Figure 1 and Figure 4 In one embodiment, the test apparatus further includes a grouting pipe 6; the grouting pipe 6 is disposed on the crack forming structure 3 and can be arranged to penetrate into the forming mold 2 to a set depth along with the crack forming structure 3. Specifically, the crack forming structure 3 has a first side fixing hole, and the grouting pipe 6 is disposed in the first side fixing hole. Preferably, the grouting pipe 6 is also fixed to the crack forming structure 3 by steel wire binding. The grouting pipe 6 is used to construct the grouting hole 92 on the crack specimen 9.

[0051] Reference Figure 1 and Figure 4 In one embodiment, the testing apparatus further includes a water injection pipe 7; the water injection pipe 7 is disposed on the crack forming structure 3 and can be arranged to extend into the forming mold 2 to a set depth along with the crack forming structure 3. Specifically, the crack forming structure 3 has a second side fixing hole, and the water injection pipe 7 is disposed in the second side fixing hole. Preferably, the water injection pipe 7 is also fixed to the crack forming structure 3 by steel wire binding. The water injection pipe 7 is used to construct water injection holes 93 on the cracked specimen 9.

[0052] Reference Figure 4 Preferably, the water injection pipe 7 is a threaded steel pipe.

[0053] Reference Figures 1 to 5 In one embodiment, the fabrication of a concrete specimen with a crack depth of 100 mm and a crack width of 1 mm is used as an example for illustration. The fabrication process of this cracked concrete specimen (i.e., cracked specimen 9) includes the following steps:

[0054] S1. Select a crack forming component 3 (such as a PVC rigid sheet) with a thickness of 1mm. After cutting, ensure that its length is 550mm and its height is 150mm.

[0055] S2. Cut out the first side fixing hole on the crack forming structure 3, so that the left side wall of the first side fixing hole is 20mm away from the left side of the crack forming structure 3.

[0056] Cut out the second side fixing hole on the crack forming structure 3, such that the right side wall of the second side fixing hole is 20mm away from the right side of the crack forming structure 3.

[0057] The connecting hole 31 is punched in the crack forming structure 3;

[0058] S3. Fix the grouting pipe 6 to the first side fixing hole;

[0059] Fix the water injection pipe 7 to the second side fixing hole;

[0060] Connect the connecting hole 31 to the pull rope 8, and connect the pull rope 8 to the motor; wherein, the motor has been pre-fixed to the top 121 of the frame 12 of the fixing bracket 1;

[0061] S4. Place the "forming mold 2 with internal groove 21 and dimensions of 550mm×150mm×150mm" on the mounting position 111 of the fixed bracket 1, and limit and fix the left and right sides of the forming mold 2 with the top clamping rod 51.

[0062] S5. Place the crack forming component 3 in the groove 21 of the forming mold 2, and adjust the motor to make the crack forming component 3 penetrate 100mm into the forming mold (purpose: to construct a crack with a depth of 100mm in the concrete test block).

[0063] S6. Place the test device on the molding vibration table, then pour the concrete into the groove 21 of the molding mold 2, mix the concrete, and vibrate to form the mold.

[0064] S7. Take a portion of the concrete mortar and test its setting time;

[0065] S8. When the concrete is close to initial setting, the crack forming component 3 is slowly pulled out of the concrete by the motor.

[0066] S9. After the concrete has fully hardened, remove the formwork and allow it to cure.

[0067] S10. After curing to a certain age, the "concrete test block with crack 91" will be used for grouting and sealing effect test of crack leakage.

[0068] In one embodiment, the present invention has the following technical effects:

[0069] (1) The mounting bracket 1 of this utility model has an installation position 111 that combines an open layout with front and rear openings, which facilitates the assembly and disassembly of the molding mold 2 and is conducive to the sequential production of multiple concrete test blocks with cracks 91. The test device of this utility model has a clear structure and strong practicality, and can quickly produce concrete test blocks with cracks 91.

[0070] (2) The crack forming component 3 of this utility model can flexibly adjust the pre-embedded depth to produce concrete cracks 91 with different depth requirements; at the same time, the thickness of the crack forming component 3 can also be selected according to actual needs to control the width of the cracks 91 in the concrete test block. In addition, with the presence of the crack forming component 3 of this utility model, the cracks 91 produced by the concrete test block can be maintained in a continuous manner (e.g., from the left side to the right side).

[0071] (3) The crack forming component 3 of this utility model is pulled out of the concrete test block by a motor, which helps to ensure the crack forming quality of the concrete test block and effectively avoids crack damage caused by operator error. At the same time, the use of a motor for traction effectively reduces labor costs.

[0072] (4) Preferably, the grouting pipe 6 and the water injection pipe 7 are fixed on the crack forming structure 3. The grouting pipe 6 and the water injection pipe 7 serve as pre-reserved holes for the subsequently formed concrete test blocks (such as grouting hole 92 and water injection hole 93), which facilitates the installation of the grouting pipe and the water injection pipe on the corresponding holes of the subsequent concrete test blocks, thereby facilitating the corresponding grouting and water injection tests.

[0073] Other aspects of the testing device for preparing cracked specimens described in this utility model are found in the prior art and will not be repeated here.

[0074] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Therefore, any modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the scope of the technical solution of the present utility model.

Claims

1. A testing apparatus for preparing cracked specimens, characterized in that, The device includes a fixed support, a molding die, a crack forming structure, and a traction device. The fixed support can be placed on the ground or on a molding vibration table. The fixed support has an installation position. The molding die is installed at the installation position and is used as a mold for forming crack specimens. The crack forming structure can be inserted into the molding die to a set depth. The traction device is installed on the fixed support and is connected to the crack forming structure for adjusting the height of the crack forming structure.

2. The testing apparatus for preparing cracked specimens according to claim 1, characterized in that, The crack forming structure is a plate.

3. The testing apparatus for preparing cracked specimens according to claim 2, characterized in that, The plate is provided with a connecting hole, through which the plate can be connected to a pull rope.

4. The testing apparatus for preparing cracked specimens according to claim 2, characterized in that, The board is a rigid PVC sheet.

5. The testing apparatus for preparing cracked specimens according to claim 1, characterized in that, The molding die is an ABS plastic molding die.

6. The testing apparatus for preparing cracked specimens according to claim 1, characterized in that, The traction device is a motor; the motor is connected to the crack forming structure via a pull rope.

7. The testing apparatus for preparing cracked specimens according to claim 1, characterized in that, The testing device further includes a limiting and fixing assembly; the limiting and fixing assembly includes a clamping member and a limiting member; one end of the clamping member is fixed to the fixed bracket through the limiting member, and the other end of the clamping member can press against the molding mold to limit and fix the molding mold.

8. The testing apparatus for preparing cracked specimens according to claim 7, characterized in that, The clamping member is a clamping rod with a threaded portion; the limiting member is a nut; the nut can be set on the threaded portion; one end of the clamping rod is adjustablely connected to the fixed bracket through the nut.

9. The testing apparatus for preparing cracked specimens according to claim 1, characterized in that, The test apparatus also includes a grouting pipe; the grouting pipe is disposed on the crack forming structure and can be arranged to penetrate into the forming mold to a set depth along with the crack forming structure.

10. A testing apparatus for preparing cracked specimens according to any one of claims 1 to 9, characterized in that, The test apparatus also includes a water injection pipe; the water injection pipe is disposed on the crack forming structure and can be arranged to penetrate into the forming mold to a set depth as the crack forming structure penetrates into the forming mold.

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