A device for testing expansion stress of expansion grouting materials

Abstract

The invention discloses an expansion stress testing device for an expansive grouting material, comprising a mold, a pressure component and a testing component. The mold comprises a lower cover plate, a template is provided on the top of the lower cover plate, an opening is provided on the top of the template for inserting a sample and supporting the sample on the top of the lower cover plate, the testing component is installed at the bottom of the template and is used to detect the stress magnitude of the sample expansion, the pressure component can apply a predetermined test pressure to the sample, and an upper cover plate which can close the template opening is arranged above the lower cover plate. The invention can improve the accuracy of the test and simplify the test process through the mold, the pressure component and the testing component, and can also be easily disassembled and reused multiple times as needed to meet different test requirements.

Description

Technical Field

[0001] The invention relates to the technical field of stress testing, and in particular to a device for testing expansion stress of an expansion type grouting material. Background Art

[0002] Expansive grouting material is a cement-based grouting material with self-expansion properties. It is mainly used for grouting structural gaps, cavities, cracks and other parts in bridges, tunnels, subways, mines and other projects to improve the integrity, density and durability of the structure. The expansion performance of expansive grouting material is its important technical indicator, which directly affects its grouting effect and project quality.

[0003] The expansion property of expansive grouting materials is one of their important characteristics, so expansion stress testing is required to evaluate their performance. At present, there are some expansion stress testing devices on the market. Although these testing devices can measure the expansion of expansive grouting materials, they still have some shortcomings, such as complex structure, cumbersome operation, low precision, and high cost.

[0004] Therefore, it is necessary to develop a new, simple, efficient and low-cost expansion testing device for expansive grouting materials to meet the needs of engineering practice and scientific research. Summary of the invention

[0005] In order to solve the technical problems raised in the above background technology, the present invention provides an expansion stress testing device for an expansive grouting material.

[0006] The present invention is implemented by the following technical scheme: an expansion stress testing device for an expansive grouting material, comprising a mold, a pressure assembly, and a testing assembly, wherein the mold comprises a lower cover plate, the top of the lower cover plate has a template, the top of the template has an opening for a sample to be inserted and supported on the top of the lower cover plate, the testing assembly is installed at the bottom of the template, and is used to detect the stress caused by the expansion of the sample, the pressure assembly can apply a predetermined test pressure to the sample, and an upper cover plate that can close the template opening is arranged above the lower cover plate.

[0007] As a further improvement of the above solution, a groove for placing the template is provided on the top of the lower cover plate.

[0008] As a further improvement of the above scheme, the test assembly includes a pressure sensor and a digital acquisition system. The pressure sensor is installed at the bottom of the groove and is electrically connected to the digital acquisition system. The pressure sensor can obtain stress data of the sample expansion, and the digital acquisition system can convert and record and read the stress data to indirectly judge the free expansion performance and expansion reaction rate of the corresponding sample.

[0009] As a further improvement of the above solution, two opposite first columns are rotatably provided on the lower cover plate, and a through hole cooperating with the first columns is opened on the upper cover plate.

[0010] As a further improvement of the above scheme, the template includes a first arc plate and a second arc plate adapted to each other, the first arc plate and the second arc plate are closed to form an enclosed space that can surround the outer circumference of the sample, and the closed first arc plate and the second arc plate are positioned and fixed by a locking mechanism.

[0011] The locking mechanism includes two opposite clamping plates and an action component. The clamping surfaces of the two clamping plates are respectively adapted to the outer arc sides of the two arc plates. The action component is driven by the rotation of the two first columns and can guide the two clamping plates to approach or separate from each other.

[0012] As a further improvement of the above scheme, the action component includes a first bevel tooth arranged on the first column, and the top of the lower cover plate is relatively supported by two second columns parallel to the first column, and each of the second columns is rotatably inserted with a cylinder perpendicular to it, and one end of the cylinder is provided with a second bevel tooth matching the first bevel tooth, and the other end of the cylinder is threadedly inserted with a screw, one end of the screw is fixed to the clamp, and a telescopic rod is provided between the clamp and the second column.

[0013] As a further improvement of the above solution, at least one limiting rod parallel to the second column is arranged on the top of the lower cover plate, and the bottoms of the two second columns are fixed on the same support ring. The outer peripheral side of the support ring is provided with ear holes that are slidably plugged with the limiting rod.

[0014] As a further improvement of the above scheme, a motor is installed inside the lower cover plate, a transmission gear is arranged on the motor output shaft, the bottoms of the two first columns penetrate into the plate body of the lower cover plate, and are fixed with driven gears matching with the transmission gear.

[0015] As a further improvement of the above scheme, the first bevel gear includes a plurality of gear teeth, the gear teeth are radially inserted on the first column, the first column has a movable groove, a movable block is elastically arranged in the movable groove, the bottom side wall of the movable block is rotatably connected to a second connecting rod, one end of the second connecting rod is rotatably connected to the first connecting rod, and one end of the first connecting rod is fixed to the centripetal side wall of the gear teeth.

[0016] A pressure-bearing rod is elastically inserted at the side wall of the moving block near the top, which can be horizontally extended to the outside of the first column and squeezed and matched with the upper cover plate after contacting. A card slot is opened on the outside of the moving block, and a card block matching with the card slot is elastically arranged on the wall of the movable slot. The side of the card block away from the moving block is connected to the free end of the pressure-bearing rod by a pull rope;

[0017] The first column comprises a smooth section and a threaded section arranged at the bottom of the smooth section, the through hole wall is in sliding contact with the outer wall of the smooth section, and the through hole wall is in threaded contact with the outer wall of the threaded section.

[0018] As a further improvement of the above solution, the bottom of the moving block is connected to the bottom wall of the movable groove through a first spring, and when the first spring is in a non-deformed state, each of the gear teeth extends to the outside of the first column to mesh with the second bevel teeth;

[0019] The pressure-bearing rod is connected to the first column through a reel and a reel. When the coil spring is in a non-deformed state, the pressure-bearing rod is in a horizontal state, and at this time, the card slot is located above the card block, and the pull rope is in a tensioned state;

[0020] An open slot communicating with the movable slot is provided in the first column, the clamping block is arranged in the open slot, and a second spring is arranged between the clamping block and the open slot.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. The expansion stress testing device for the expansion grouting material of the present invention can improve the accuracy of the test and simplify the test process through the mold, the pressure component and the test component. At the same time, it can be easily disassembled and reused multiple times as needed to meet different test requirements.

[0023] 2. The expansion stress testing device for the expansion grouting material of the present invention can conveniently realize the closing and fixing of the arc plates to form a mold for inserting samples only by rotating the first column. At the same time, it can also realize the closed installation of the upper cover plate at the template opening, and enable the upper cover plate to apply pressure to the sample inserted in the opening, which is convenient and efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall cross-sectional structure of the device of the present invention when the cover plate is not installed (two bevel teeth are meshing);

[0025] Figure 2 for Figure 1 The enlarged structural diagram at A in the middle;

[0026] Figure 3 for Figure 1 The enlarged structural diagram at B in the middle;

[0027] Figure 4 for Figure 1 A schematic diagram of the top view of the structure of the middle support ring, the second column and other components;

[0028] Figure 5 for Figure 1 A schematic diagram of a partial cross-sectional structure of the cover plate of the middle device in another state (separation between the two bevel teeth);

[0029] Figure 6 for Figure 5 A schematic diagram of a partial cross-sectional structure of the cover plate of the middle device in another state (separation between two bevel teeth);

[0030] Figure 7 for Figure 6 A schematic diagram of the partial cross-sectional structure of the cover plate of the middle device in the threaded section state (separation between the two bevel teeth);

[0031] Figure 8 for Figure 7 Schematic diagram of the cross-sectional structure of the cover plate of the middle device in the disengaged state (separated between the two bevel teeth).

[0032] Description of main symbols:

[0033] 1. Lower cover plate; 2. Groove; 3. Pressure sensor; 4. First arc plate; 5. Second arc plate; 6. Clamp plate; 7. First column; 8. First bevel gear; 81. Gear tooth; 9. Second bevel gear; 10. Support ring; 11. Ear hole; 12. Limit rod; 13. Second column; 14. Cylinder; 15. Screw; 16. Telescopic rod; 17. Movable groove; 18. Moving block; 19. First connecting rod; 20. Second connecting rod; 21. Pressure rod; 22. Slot; 23. Block; 24. Motor; 25. Transmission gear; 26. Driven gear; 27. Upper cover plate; 28. Through hole. DETAILED DESCRIPTION

[0034] The present invention is further described below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form a new embodiment.

[0035] Please combine Figures 1 to 8 The expansion stress testing device of the expansion grouting material includes a mold, a pressure component, and a test component. The mold includes a lower cover plate 1, and a template is provided on the top of the lower cover plate 1. The top of the template has an opening for inserting a sample and supporting it on the top of the lower cover plate 1. The test component is installed at the bottom of the template and is used to detect the stress caused by the expansion of the sample. The pressure component can apply a predetermined test pressure to the sample.

[0036] The pressure-applying component may be a pressure applicator, which is used to apply pressure to the expansive grouting material sample. The pressure range and application method may be selected as required to ensure the accuracy and stability of the test.

[0037] An upper cover plate 27 is arranged above the lower cover plate 1 to close the opening of the template, so as to facilitate the placement or removal of the expansion grouting material sample in the mold.

[0038] The sample in this embodiment is an expansive grouting material specimen. The expansive grouting material sample is used for testing, and its material can be selected as needed to meet different test requirements.

[0039] A groove 2 for placing the template is provided on the top of the lower cover plate 1 .

[0040] The test assembly includes a pressure sensor 3 and a digital acquisition system. The pressure sensor 3 is installed at the bottom of the groove 2 and is electrically connected to the digital acquisition system. The pressure sensor 3 can obtain the stress data of the sample expansion, and its measurement range can be selected as needed to ensure the accuracy of the test results.

[0041] The digital acquisition system cooperates with the transmitter to convert and record the stress data to indirectly judge the free expansion performance and expansion reaction rate of the corresponding sample, and can intuitively display the size of the expansion stress of the concrete and realize continuous monitoring.

[0042] Two opposite first columns 7 are rotatably provided on the lower cover plate 1, and through holes 28 cooperating with the first columns 7 are provided on the upper cover plate 27, so that the upper cover plate 27 can be installed on the first columns 7 to close the opening.

[0043] The template includes a first arc plate 4 and a second arc plate 5 that fit each other. When the first arc plate 4 and the second arc plate 5 are closed, an enclosing space that can surround the outer circumference of the sample is formed. The closed first arc plate 4 and the second arc plate 5 are positioned and fixed by a locking mechanism.

[0044] The locking mechanism includes two opposite clamping plates 6 and an action component. The clamping surfaces of the two clamping plates 6 are respectively adapted to the outer arc sides of the two arc plates. The action component is driven by the rotation of the two first columns 7 and can guide the two clamping plates 6 to approach or separate from each other.

[0045] The action component includes a first bevel gear 8 arranged on the first column 7, and the top of the lower cover plate 1 is relatively supported by two second columns 13 parallel to the first column 7. A cylinder 14 perpendicular to the second column 13 is rotatably inserted thereon, and a second bevel gear 9 matching the first bevel gear 8 is arranged at one end of the cylinder 14. A screw rod 15 is threadedly inserted at the other end of the cylinder 14, and one end of the screw rod 15 is fixed on the splint 6. A telescopic rod 16 is arranged between the splint 6 and the second column 13. In other words, the relative movement between the two splints 6 can be achieved by rotating the two cylinders 14.

[0046] At least one limiting rod 12 parallel to the second column 13 is arranged on the top of the lower cover plate 1, and the bottoms of the two second columns 13 are fixed on the same support ring 10. The outer peripheral side of the support ring 10 is provided with ear holes 11 which are slidably plugged with the limiting rod 12 to improve the stability of the second column 13 placed on the top of the lower cover plate 1, and the second bevel gear 9 is located above the first bevel gear 8 to facilitate the disassembly and assembly of the clamping plate 6, the support ring 10 and other components.

[0047] A motor 24 is installed inside the lower cover 1 , and a transmission gear 25 is arranged on the output shaft of the motor 24 . The bottoms of the two first columns 7 penetrate into the plate body of the lower cover 1 , and are both fixed with driven gears 26 matching with the transmission gear 25 .

[0048] The first bevel gear 8 includes a plurality of gear teeth 81, which are radially inserted on the first column 7. The first column 7 has a movable groove 17, in which a moving block 18 is elastically arranged. The bottom side wall of the moving block 18 is rotatably connected to a second connecting rod 20, and one end of the second connecting rod 20 is rotatably connected to a first connecting rod 19, and one end of the first connecting rod 19 is fixed on the centripetal side wall of the gear teeth 81.

[0049] A pressure rod 21 is elastically inserted at the side wall of the moving block 18 near the top, which can be horizontally extended to the outside of the first column 7 and squeezed into fit after contacting the upper cover plate 27. A slot 22 is opened on the outside of the moving block 18, and a block 23 that matches the slot 22 is elastically provided on the groove wall of the movable groove 17. The side of the block 23 away from the moving block 18 is connected to the free end of the pressure rod 21 by a pull rope.

[0050] The first column 7 comprises a smooth section and a threaded section arranged at the bottom of the smooth section, the through hole wall is in sliding contact with the outer wall of the smooth section, and the through hole wall is in threaded contact with the outer wall of the threaded section.

[0051] The bottom of the moving block 18 is connected to the bottom wall of the movable groove 17 through the first spring. When the first spring is in a non-deformed state, each gear tooth 81 extends to the outside of the first column 7 to mesh with the second bevel gear 9.

[0052] The pressure rod 21 is connected to the first column 7 through a reel. When the coil spring is in a non-deformed state, the pressure rod 21 is in a horizontal state, and the card slot 22 is located above the card block 23, and the pull rope is in a tensioned state.

[0053] An open slot communicating with the movable slot 17 is formed in the first column 7 , a clamping block 23 is disposed in the open slot, and a second spring is disposed between the clamping block 23 and the open slot.

[0054] The working principle of this embodiment:

[0055] When assembling the device before the test, first install the pressure sensor 3 in the groove 2, then close the first arc plate 4 and the second arc plate 5 and place them in the groove 2, install and support the support ring 10 on the top of the lower cover plate 1 through the ear hole 11 and the limit rod 12, so that the two clamping plates 6 are respectively located on both sides of the two arc plates. At this time, the first spring is in a non-deformed state, and the second bevel gear 9 is just engaged with the first bevel gear 8. The output shaft of the motor 24 drives the transmission gear 25, the two driven gears 26, the two first columns 7, the two first bevel gears 8, the two second bevel gears 9, and the two second cylinders 14 to rotate together, so that the two cylinders 14 are respectively screwed with their respective screw rods 15 (and under the limiting action of the telescopic rod 16) to drive the two clamping plates 6 to approach each other, so that the first arc plate 4 and the second arc plate 5 are closed to form a sample for insertion.

[0056] The sample is placed on the pressure sensor 3, and the upper cover plate 27 is manually connected to the smooth section of the first column 7 through the through hole 28 and gradually moved downward. During this period, the bottom of the upper cover plate 27 first touches the pressure rod 21, which drives the pressure rod 21 and the moving block 18 to move downward together (the first spring is compressed and deformed). When the moving block 18 moves to the bottom of the movable groove 17 (the slot 22 moves to the block 23 to engage with the slot 22), as the upper cover plate 27 continues to move downward, it forces the pressure rod 21 to rotate and bend downward (the coil spring is compressed and deformed). ) to be received inside the first column 7, so that the upper cover plate 27 can continue to move to the threaded section over the pressure-bearing rod 21. When the upper cover plate 27 moves to the threaded section, the hand is separated from the upper cover plate 27, and the motor 24 is controlled to operate. Then the threaded section of the first column 7 will rotate to be screwed with the through hole 28, and the upper cover plate 27 will automatically move downward on the first column 7 to close the opening of the template, and the sample can be pushed to the pressure sensor 3. When the value observed by the digital acquisition system is greater than zero and stable in the vicinity, the motor 24 is stopped and maintained in this state. The stress measured by the pressure sensor 3 is recorded; data conversion and record reading are performed through the transmitter and data acquisition system, from which the free expansion performance and expansion reaction rate of the expansive grouting material specimen (sample) can be indirectly judged until satisfactory test results are obtained.

[0057] After the test is finished, the control motor 24 rotates in the opposite direction, and the first column 7 rotates in the opposite direction to move the upper cover plate 27 upward to disengage from the opening and move to the smooth section. At this time, manually pulling the upper cover plate 27 upward will contact the pressure rod 21. Since the clamping block 23 and the clamping slot 22 are engaged to provide a certain resistance, the pressure rod 21 will rotate and bend upward (compression deformation of the coil spring) and be accommodated inside the first column 7, so that the upper cover plate 27 can pass over the pressure rod 21 and disengage from the first column 7, so as to remove the sample. When the pressure rod 21 bends and rotates upward, the clamping block 23 can be pulled out of the clamping slot 22, and the moving block 18 will move upward to the initial position under the elastic force of the first spring, so that the gear teeth 81 will protrude to the outside of the first column 7 again for subsequent use.

[0058] The above-mentioned embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. A device for testing expansion stress of an expansive grouting material, characterized in that: The invention comprises a mold, a pressure component and a test component. The mold comprises a lower cover plate, a template is provided on the top of the lower cover plate, an opening is provided on the top of the template for inserting a sample and supporting the sample on the top of the lower cover plate, the test component is installed at the bottom of the template and is used to detect the stress magnitude of the sample expansion, the pressure component can apply a predetermined test pressure to the sample, and an upper cover plate is provided above the lower cover plate and can close the template opening; The lower cover plate is rotatably provided with two opposite first upright posts, and the upper cover plate is provided with through holes matched with the first upright posts; The template includes a first arc plate and a second arc plate adapted to each other, the first arc plate and the second arc plate are closed to form an enclosed space that can surround the outer circumference of the sample, and the closed first arc plate and the second arc plate are positioned and fixed by a locking mechanism. The locking mechanism comprises two opposite clamping plates and an action component, the clamping surfaces of the two clamping plates are respectively adapted to the outer arc sides of the two arc plates, and the action component is driven by the rotation of the two first columns to guide the two clamping plates to approach or separate from each other; The action assembly includes a first bevel gear arranged on the first column, the top of the lower cover plate is relatively supported by two second columns parallel to the first columns, each of the second columns is rotatably inserted with a cylinder perpendicular to it, one end of the cylinder is provided with a second bevel gear matched with the first bevel gear, the other end of the cylinder is threadedly inserted with a screw, one end of the screw is fixed to the clamping plate, and a telescopic rod is provided between the clamping plate and the second column; The first bevel gear comprises a plurality of gear teeth, the gear teeth are radially inserted on the first column, the first column has a movable groove, a moving block is elastically arranged in the movable groove, a second connecting rod is rotatably connected to the side wall at the bottom of the moving block, one end of the second connecting rod is rotatably connected to the first connecting rod, and one end of the first connecting rod is fixed to the centripetal side wall of the gear teeth, A pressure-bearing rod is elastically inserted at the side wall of the moving block near the top, which can be horizontally extended to the outside of the first column and squeezed and matched with the upper cover plate after contacting. A card slot is opened on the outside of the moving block, and a card block matching with the card slot is elastically arranged on the wall of the movable slot. The side of the card block away from the moving block is connected to the free end of the pressure-bearing rod by a pull rope; The first column comprises a smooth section and a threaded section arranged at the bottom of the smooth section, the through hole wall is in sliding contact with the outer wall of the smooth section, and the through hole wall is in threaded contact with the outer wall of the threaded section.

2. The expansion stress testing device for expansion grouting materials according to claim 1, characterized in that: The top of the lower cover plate is provided with a groove for placing the template.

3. The expansion stress testing device for expansion grouting materials according to claim 2, characterized in that: The test assembly includes a pressure sensor and a digital acquisition system. The pressure sensor is installed at the bottom of the groove and is electrically connected to the digital acquisition system. The pressure sensor can obtain stress data of the sample expansion. The digital acquisition system can convert and record and read the stress data to indirectly judge the free expansion performance and expansion reaction rate of the corresponding sample.

4. The expansion stress testing device for expansion grouting materials according to claim 1, characterized in that: At least one limiting rod parallel to the second column is arranged on the top of the lower cover plate, and the bottoms of the two second columns are fixed on the same support ring. The outer peripheral side of the support ring is provided with ear holes which are slidably plugged with the limiting rod.

5. The expansion stress testing device for expansion grouting materials according to claim 1, characterized in that: A motor is installed inside the lower cover plate, a transmission gear is arranged on the output shaft of the motor, and the bottoms of the two first columns penetrate into the plate body of the lower cover plate and are both fixed with driven gears matching with the transmission gear.

6. The expansion stress testing device for expansion grouting materials according to claim 1, characterized in that: The bottom of the moving block is connected to the bottom wall of the movable groove through a first spring, and when the first spring is in a non-deformed state, each of the gear teeth extends to the outside of the first column to mesh with the second bevel teeth; The pressure-bearing rod is connected to the first column via a reel and a coil spring. When the coil spring is in a non-deformed state, the pressure-bearing rod is in a horizontal state, and at this time, the card slot is located above the card block, and the pull rope is in a tensioned state; An open slot communicating with the movable slot is provided in the first column, the clamping block is arranged in the open slot, and a second spring is arranged between the clamping block and the open slot.

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