A multifunctional concrete expansive agent bellows shrinkage measuring device

Abstract

This utility model discloses a multifunctional concrete expansion agent corrugated pipe shrinkage measuring device, including a base. A fixed support plate and a movable support plate are symmetrically arranged on the upper surface of the base along its length. Two horizontally arranged base columns are positioned between the fixed and movable support plates. A dial indicator with its output end passing through either the fixed or movable support plate is provided on the opposite side of each support plate. In this application, the movable support plate can slide along the two cylindrical base columns and be locked with fastening screws, achieving stepless / stepped rapid switching of gauge lengths from 200 mm to 600 mm. By installing a dial indicator on each of the fixed and movable support plates, a dual-end "comparative measurement" mode is formed, automatically eliminating systematic errors caused by temperature gradients or micro-deformation of the base. Simultaneously, it can distinguish the shrinkage differences at both ends of the specimen, providing richer data dimensions for optimizing the expansion agent formulation.

Description

Technical Field

[0001] This utility model belongs to the technical field of concrete expansion agent testing devices, and in particular relates to a multifunctional concrete expansion agent corrugated pipe shrinkage measuring device. Background Technology

[0002] Concrete expansion agents exhibit volume shrinkage during the initial setting or hardening process. Concrete shrinkage can cause wall cracking, affecting the evaluation indicators of concrete durability. The micro-expansion of expansion agents can compensate for the cracking caused by concrete shrinkage, but the actual effectiveness of expansion agents is highly dependent on the accurate measurement of their expansion or shrinkage rate. Therefore, the development of concrete expansion agents often requires multiple methods and specimens of different sizes to measure the shrinkage rate of concrete. Concrete shrinkage dilatation meters (such as dial gauges) are instruments used to determine the length or volume change of concrete specimens under specified temperature and humidity conditions. In the autogenous shrinkage test of concrete, due to the different sizes of specimens, multiple devices and more personnel are often required for testing. The task of transporting specimens is heavy, and the test data may be incorrect when operating multiple devices. Furthermore, the initial length and curing time must be measured by the same person to avoid large errors due to the method of operation. Each measurement requires repositioning of the concrete specimen, resulting in a waste of manpower and resources. Summary of the Invention

[0003] The purpose of this invention is to address the problems existing in the prior art by providing a multifunctional concrete expansion agent corrugated pipe shrinkage measuring device. It can perform concrete shrinkage tests (contact method and non-contact corrugated pipe method) in GB / T 50082 standard and concrete restricted expansion rate tests in GB / T 23439 standard, and supports the fixation and measurement of concrete specimens of different sizes.

[0004] To achieve the above objectives, the following technology is used: A multifunctional concrete expansion agent corrugated pipe shrinkage measuring device includes a base. A fixed support plate and a movable support plate are symmetrically arranged on the upper surface of the base along its length. Two horizontally arranged base columns are positioned between the fixed and movable support plates, spaced apart and at the same horizontal height. Each base column is cylindrical, with one end abutting against one side of the fixed support plate and the other end movably passing through the interior of the movable support plate. A second pre-reserved groove is provided at the bottom of the movable support plate, and a fastening screw abutting against the base column is provided on the groove wall of the second pre-reserved groove. A dial indicator with its output end passing through either the fixed or movable support plate is provided on the opposite side of both the fixed and movable support plates.

[0005] In the above technical solution, the movable support plate can slide along the two cylindrical base columns and be locked with fastening screws, achieving stepless / stepped rapid switching of gauge length from 200mm to 600mm. A single base can cover various specifications of specimens such as corrugated pipes, prisms, and cubes, eliminating redundant investment of "one instrument for one size" and significantly reducing the number of equipment and laboratory space. By installing a dial indicator on both the fixed and movable support plates, a dual-end "comparative measurement" mode is formed, automatically eliminating systematic errors caused by temperature gradients or micro-deformation of the base. Simultaneously, it can distinguish the shrinkage differences at both ends of the specimen, providing richer data dimensions for optimizing the expansion agent formulation. The cylindrical base columns provide a "two-point simply supported, no additional constraint" boundary, allowing the specimen to freely expand and contract in the horizontal direction, consistent with the actual service state of the components on site. The resulting expansion / shrinkage rate better reflects the intrinsic properties of the expansion agent material, avoiding false constraint strain caused by excessive clamping or vertical placement.

[0006] Optionally, the fixed abutment plate has two abutment slots on one side that are adapted to the two bottom posts, and the movable abutment plate has two through holes that are adapted to the two bottom posts.

[0007] In the above technical solution, the fixed support plate is provided with support column slots and the movable support plate is provided with through column holes, so that one end of the bottom column "supports" and the other end "passes through", forming a "plug-support" structure that can be quickly disassembled and assembled; when installing or replacing bottom columns of different lengths, there is no need for the overall disassembly device, which improves versatility and operational efficiency.

[0008] Optionally, the outer periphery of the base column is provided with multiple adjustment slots along the length of the base column, and one end of the fastening screw extends into any adjustment slot on the outer periphery of the base column. By providing multiple discrete adjustment slots along the length of the base column, and in conjunction with the fastening screw, the position of the movable stop plate can be finely adjusted in stages, quickly adapting to commonly used corrugated pipe gauge lengths such as 200mm-600mm, and improving the device's "multi-purpose" capability.

[0009] Optionally, an adjustment elongated hole is provided on the outer periphery of the base column along the length direction of the base column. The inner wall of the adjustment elongated hole is flat. One end of the fastening screw extends into the adjustment elongated hole on the outer periphery of the base column. By using a continuous adjustment elongated hole with a flat inner wall, the contact between the fastening screw and the base column changes from "point contact" to "surface contact". This retains the advantages of stepless adjustment and significantly improves the anti-torsional and anti-slip stiffness after locking, while reducing the micro-motion error of the movable stop plate during the test.

[0010] Optionally, a side fixing plate is symmetrically arranged on the upper surface of the base and on the opposite side of the two base columns. The side fixing plate is provided with a plurality of sliding wheels, and the sliding wheels rotate in a horizontal direction when testing block concrete.

[0011] Optionally, a folding support frame is hinged to the bottom of the base on the side away from the fixed abutment. The folding support frame has a flipping angle range of 0°-150° and a supporting height of not less than 2 cm.

[0012] A support frame that can be hinged at the rear of the base and rotated from 0 to 150° can be used to make the entire device tilt slightly when it is supported. In the self-shrinkage test, when measuring block concrete, the block concrete can be placed on the two bottom pipes and the block concrete can slide automatically using its own weight and the pulleys of the fixed plate, thus achieving an automatic measurement effect.

[0013] Optionally, the folding support frame is a metal part, the folding support frame includes a fixed part and a flipping part, the fixed part is fixed to the bottom of the base, the flipping part is hinged to the fixed part, a magnetic block is provided on the side of the flipping part facing the fixed part, and a rubber sleeve is provided at the end of the flipping part.

[0014] In the above technical solution, by embedding a magnetic block in the flipping part, it can be magnetically attached to the metal fixing part after folding, avoiding the support frame from accidentally swinging down and causing bumping noise during transportation. In addition, a rubber sleeve is added to the end of the flipping part to increase the friction with the table when it is up, preventing the device from slipping due to test vibration; at the same time, the rubber sleeve can buffer the impact of metal on hard tabletop and protect the experimental table.

[0015] Optionally, a first reserved groove is provided on the bottom of the base and on the side away from the fixed abutment, and the folding support frame is disposed inside the first reserved groove, the depth of the first reserved groove being greater than the thickness of the folding support frame after folding.

[0016] In the above technical solution, the folding support frame is stored in the first reserved slot, and the depth of the slot is greater than the thickness of the support frame. The bottom surface of the base remains flat, and it can be directly stacked or stored against the wall, saving laboratory space and avoiding the tripping hazard caused by the protruding support frame.

[0017] Compared with the prior art, the beneficial effects of this utility model are: 1. In this application, the movable support plate can slide along the two cylindrical base columns and be locked with fastening screws, achieving stepless / stepped rapid switching of gauge length from 200 mm to 600 mm. A single base can cover various specifications of specimens such as corrugated pipes, prisms, and cubes, eliminating the redundant investment of "one instrument for one size," significantly reducing the number of equipment and laboratory space. Furthermore, by placing the specimen horizontally in the "simply supported" space formed by the two base columns, it does not need to be moved after installation. The dial indicator probe always maintains contact with the specimen end face; subsequent age readings only require direct observation of the dial indicator, eliminating the need for reinstallation and recalibration, avoiding manual errors caused by "each measurement requiring the same person," and greatly reducing manpower burden. By installing a dial indicator on both the fixed and movable support plates, a dual-end "comparative measurement" mode is formed, automatically eliminating systematic errors caused by temperature gradients or micro-deformation of the base. Simultaneously, it can distinguish the shrinkage differences at both ends of the specimen, providing richer data dimensions for optimizing the expansion agent formulation.

[0018] 2. In this application, a cylindrical base column provides a "two-point simply supported, unconstrained" boundary, allowing the specimen to freely expand and contract in the horizontal direction. The measurement results are closer to the actual service condition. Consistent with the actual service condition of the components on site, the obtained expansion / contraction rate better reflects the intrinsic properties of the expansion agent material, avoiding false constraint strain caused by excessive clamping or vertical placement.

[0019] 3. In this application, one person can complete the entire process of sample loading, distance adjustment, and reading, reducing the need for experimental personnel. Since the specimen remains in the same measurement position throughout the entire age period, the random error caused by "multiple loading and unloading-repositioning" is eliminated, and "continuous monitoring of the entire process" of the same specimen can be easily achieved. Compared with "simultaneous measurement of multiple specimens", it not only saves the number of specimens, but also further improves the statistical reliability through single specimen time series data.

[0020] 4. When testing block concrete specimens, this application can form a two-sided limit by using the side fixing plates on both sides, and then lift the folding support frame to make the whole device "slightly tilted". This allows the block concrete to slide automatically on the two bottom pipes by using the weight of the block concrete and the pulleys of the fixing plates, thereby achieving an automatic measurement effect.

[0021] 5. This application, by setting multiple discrete adjustment slots along the length of the bottom column and cooperating with the fastening screw, can realize the "stepped" fine adjustment of the position of the movable stop plate, quickly adapt to the gauge length of commonly used corrugated pipes such as 200mm-600mm, and improve the "one mold for multiple uses" capability of the device.

[0022] 6. This application adopts a continuously adjustable long hole with a flat inner wall, which changes the "point contact" between the fastening screw and the bottom column to "surface contact". This not only retains the advantages of stepless adjustment, but also significantly improves the anti-torsion and anti-slip stiffness after locking, and reduces the micro-movement error of the movable plate during the test. Attached Figure Description

[0023] Figure 1 A front view cross-sectional schematic diagram of a multifunctional concrete expansion agent corrugated pipe shrinkage measuring device provided in this embodiment of the utility model; Figure 2 This is a top view schematic diagram of a multifunctional concrete expansion agent corrugated pipe shrinkage measuring device according to the present invention; Figure 3 This is a schematic diagram of the tilted state of a multifunctional concrete expansion agent corrugated pipe shrinkage measuring device according to this utility model. Figure 4 This is a side view of the movable stop plate of this utility model.

[0024] In the diagram: 1. Base; 11. First reserved slot; 2. Fixed support plate; 21. Support column slot; 3. Bottom column; 31. Adjustment slot; 4. Movable support plate; 41. Through column hole; 42. Second reserved slot; 5. Fastening screw; 6. Dial indicator; 7. Side fixing plate; 8. Sliding wheel; 9. Folding support frame. Detailed Implementation

[0025] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0026] In the description of this utility model, it should be noted that the terms "middle", "upper", "lower", "left", "right", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0027] like Figure 1As shown in Figure 4, the specific scheme of the embodiment is as follows: A multifunctional concrete expansion agent corrugated pipe shrinkage measuring device includes a base 1. A fixed support plate 2 and a movable support plate 4 are symmetrically arranged on the upper surface of the base 1 along the length direction of the base 1. Two horizontally arranged bottom columns 3 are arranged between the fixed support plate 2 and the movable support plate 4. The two bottom columns 3 are arranged at intervals and at the same horizontal height. The bottom column 3 is a cylinder. One end of the bottom column 3 abuts against one side of the fixed support plate 2, and the other end of the bottom column 3 is movably inserted into the interior of the movable support plate 4. A second reserved groove 42 is opened at the bottom of the movable support plate 4. A fastening screw 5 that abuts against the bottom column 3 is provided on the groove wall of the second reserved groove 42. A dial indicator 6 with its output end passing through the fixed support plate 2 or the movable support plate 4 is provided on the opposite side of the fixed support plate 2 and the movable support plate 4.

[0028] In the above technical solution, the movable support plate 4 can slide along the two cylindrical base columns 3 and be locked with the fastening screws 5 to achieve stepless / stepped rapid switching of gauge length from 200 mm to 600 mm; the base 1 can cover various specifications of specimens such as corrugated pipes, prisms, and cubes, eliminating the redundant investment of "one instrument for one size" and significantly reducing the number of equipment and the laboratory footprint.

[0029] Meanwhile, the specimen is placed horizontally in the "simply supported" space formed by the two base columns 1, and does not need to be moved after installation; the probe of the dial indicator 6 always keeps in contact with the end face of the specimen, and when reading the age later, you only need to observe the dial indicator 6 directly, without having to reinstall, disassemble and realign it, avoiding the manual error caused by "the same person having to operate each measurement", and greatly reducing the manpower burden.

[0030] By installing a dial gauge 6 on both the fixed plate 2 and the movable plate 4, a dual-end "comparative measurement" mode is formed, which can automatically eliminate systematic errors caused by temperature gradients or micro-deformation of the base; at the same time, it can distinguish the shrinkage difference between the two ends of the specimen, providing richer data dimensions for the optimization of the expansion agent formulation.

[0031] In addition, the cylindrical base column 3 provides a "two-point simply supported, no additional constraint" boundary, allowing the specimen to expand and contract freely in the horizontal direction, consistent with the actual service state of the on-site components. The resulting expansion / contraction rate can better reflect the intrinsic properties of the expansion agent material, avoiding false constraint strain caused by excessive clamping or vertical placement.

[0032] When in use, one person can complete the entire process of sample loading, distance adjustment, and reading, reducing the need for testing personnel. Moreover, since the specimen remains in the same measurement position throughout the entire age, the random errors caused by "multiple loading and unloading and repositioning" are eliminated, making it easy to achieve "continuous monitoring of the entire process" for the same specimen. Compared with "simultaneous measurement of multiple specimens", it not only saves the number of specimens, but also further improves the statistical reliability through single specimen time series data.

[0033] In summary, this device, with its core advantages of "multi-purpose use, no handling required, no need for repeated positioning, dual-end synchronization, and true boundary conditions," directly addresses the four major pain points of the background technology: "multiple devices, heavy handling, large errors, and wasted manpower." It provides an efficient, accurate, and economical testing method for the research and development of expansive agents and the evaluation of concrete shrinkage performance.

[0034] In this embodiment, two support slots 21 adapted to the two bottom posts 3 are provided on one side of the fixed support plate 2, and two through holes 41 adapted to the two bottom posts 3 are provided on the movable support plate 4.

[0035] In the above technical solution, the fixed support plate 2 is provided with a support column groove 21 and the movable support plate 4 is provided with a through column hole 41, so that one end of the bottom column 3 "supports" and the other end "passes through", forming a "plug-support" structure that can be quickly disassembled; when installing or replacing bottom columns 3 of different lengths, there is no need for an overall disassembly device, which improves versatility and operational efficiency.

[0036] In this embodiment, multiple adjustment slots 31 are provided on the outer periphery of the base column 3 along the length direction of the base column 3. One end of the fastening screw 5 extends into any adjustment slot 31 on the outer periphery of the base column 3. By setting multiple discrete adjustment slots 31 along the length direction of the base column 3, and cooperating with the fastening screw 5, the position of the movable stop plate 4 can be finely adjusted in stages, quickly adapting to commonly used corrugated pipe gauge lengths such as 200mm-600mm, and improving the "one mold for multiple uses" capability of the device.

[0037] Preferably, in addition to using multiple adjusting slots 31, an adjusting elongated hole can also be provided on the outer periphery of the base post 3 along the length of the base post 3. The inner wall of the adjusting elongated hole is flat, and one end of the fastening screw 5 extends into the adjusting elongated hole on the outer periphery of the base post 3. By using a continuous adjusting elongated hole with a flat inner wall, the contact between the fastening screw 5 and the base post 3 changes from "point contact" to "surface contact". This not only retains the advantages of stepless adjustment, but also significantly improves the anti-torsion and anti-slip stiffness after locking, and reduces the micro-movement error of the movable stop plate 4 during the test.

[0038] In this embodiment, a side fixing plate 7 is symmetrically arranged on the upper surface of the base 1 and on the opposite side of the two base columns 3. A plurality of sliding wheels 8 are arranged on the side fixing plate 7, and the rotation direction of the sliding wheels 8 is horizontal. When testing block concrete, the side fixing plates 7 on both sides can form a limit on both sides.

[0039] In this embodiment, a folding support frame 9 is hinged to the bottom of the base 1 on the side away from the fixed support plate 2. The folding support frame 9 has a flipping angle range of 0°-150° and a support height of not less than 2 cm.

[0040] A support frame that can be hinged at the tail of base 1 and rotated from 0° to 150° can be used to make the whole device "slightly tilted" after being supported. In the self-shrinkage test, when measuring block concrete, the block concrete can be allowed to slide on the two bottom pipes by its own weight and the pulleys of the fixed plate, so that the block concrete can slide automatically, thus achieving an automatic measurement effect.

[0041] In this embodiment, the folding support frame 9 is a metal part. The folding support frame 9 includes a fixed part and a flipping part. The fixed part is fixed to the bottom of the base 1. The flipping part is hinged to the fixed part. A magnetic block is provided on the side of the flipping part facing the fixed part. A rubber sleeve is provided at the end of the flipping part.

[0042] In the above technical solution, by embedding a magnetic block in the flipping part, it can be magnetically attached to the metal fixing part after folding, avoiding the support frame from accidentally swinging down and causing bumping noise during transportation. In addition, a rubber sleeve is added to the end of the flipping part to increase the friction with the table when it is up, preventing the device from slipping due to test vibration; at the same time, the rubber sleeve can buffer the impact of metal on hard tabletop and protect the experimental table.

[0043] In this embodiment, a first reserved groove 11 is provided on the bottom of the base 1 and on the side away from the fixed support plate 2. The folding support frame 9 is disposed inside the first reserved groove 11. The depth of the first reserved groove 11 is greater than the thickness of the folding support frame 9 after folding.

[0044] In the above technical solution, the folding support frame 9 is housed in the first reserved slot 11, and the depth of the slot is greater than the thickness of the support frame. The bottom surface of the base 1 remains flat, allowing it to be stacked directly or stored against the wall, saving laboratory space and avoiding the tripping hazard caused by the protruding support frame. The usage process of the above embodiments is as follows: I. Corrugated Pipe Specimen Testing Workflow The corrugated concrete pipe to be tested is horizontally suspended on two cylindrical base columns 3. Due to its own weight, the pipe forms a "two-point simply supported" boundary, with its two end faces lightly touching the probes of dial gauges 6 on the fixed support plate 2 and the movable support plate 4, respectively. Depending on the pipe length, the movable support plate 4 is slid to the corresponding adjustment slot 31 or adjustment elongated hole, and the fastening screw 5 is tightened to lock it in place. After the test begins, the corrugated pipe shortens axially under the action of self-shrinkage, and the dial gauges 6 at both ends record the displacement simultaneously; the difference is the total shrinkage.

[0045] II. Testing Workflow for Block Specimens First, the folding support frame 9 is raised, causing the base 1 to tilt slightly. The block concrete specimen is placed on the two base columns 3, and its own weight causes it to slide down the tilted base columns 3. The sliding wheel 8 on the side fixing plate 7 acts as a horizontal guide wheel, and the specimen can only slide smoothly along the axial direction under the constraint of the wheel surface. The front end of the specimen first contacts the dial indicator 6 on the fixed support plate 2, and the rear end is pushed forward by the sliding wheel 8 on the side of the movable support plate 4. The dial indicator 6 records the displacement in real time until the specimen is completely in contact with the fixed support plate 2. The entire process can achieve "automatic loading and automatic measurement" without manual pushing. After the test is completed, the folding support frame 9 is lowered, the magnetic block is attracted, the support is hidden in the first reserved groove 11, and the device is restored to a flat position, which is convenient for transportation and the next test.

[0046] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A multifunctional concrete expansion agent corrugated pipe shrinkage measuring device, characterized in that, The device includes a base, on the upper surface of which a fixed support plate and a movable support plate are symmetrically arranged along the length of the base. Two horizontally arranged base columns are provided between the fixed support plate and the movable support plate. The two base columns are spaced apart and at the same horizontal height. Each base column is cylindrical. One end of each base column abuts against one side of the fixed support plate, and the other end of each base column movably passes through the interior of the movable support plate. A second reserved groove is provided at the bottom of the movable support plate. A fastening screw that abuts against the base column is provided on the wall of the second reserved groove. A dial indicator with its output end passing through the fixed support plate or the movable support plate is provided on the opposite side of both the fixed support plate and the movable support plate.

2. The multifunctional concrete expansion agent corrugated pipe shrinkage measuring device according to claim 1, characterized in that: The fixed abutment plate has two abutment slots on one side that are adapted to the two base columns, and the movable abutment plate has two through holes that are adapted to the two base columns.

3. The multifunctional concrete expansion agent corrugated pipe shrinkage measuring device according to claim 1, characterized in that: The outer periphery of the base post is provided with a plurality of adjustment slots along the length of the base post, and one end of the fastening screw extends into any of the adjustment slots on the outer periphery of the base post.

4. The multifunctional concrete expansion agent corrugated pipe shrinkage measuring device according to claim 1, characterized in that: An adjustment elongated hole is provided on the outer periphery of the base post along the length direction of the base post. The inner wall of the adjustment elongated hole is flat. One end of the fastening screw extends into the adjustment elongated hole on the outer periphery of the base post.

5. The multifunctional concrete expansion agent corrugated pipe shrinkage measuring device according to claim 1, characterized in that: A side fixing plate is symmetrically arranged on the upper surface of the base and on the opposite side of the two base columns. A plurality of sliding wheels are arranged on the side fixing plate, and the sliding wheels rotate in the horizontal direction.

6. The multifunctional concrete expansion agent corrugated pipe shrinkage measuring device according to claim 1, characterized in that: A folding support frame is hinged to the bottom of the base on the side away from the fixed abutment. The folding support frame has a flipping angle range of 0°-150° and a support height of not less than 2 cm.

7. The multifunctional concrete expansion agent corrugated pipe shrinkage measuring device according to claim 6, characterized in that: The folding support frame is a metal part, and the folding support frame includes a fixed part and a flipping part. The fixed part is fixed to the bottom of the base, and the flipping part is hinged to the fixed part. A magnetic block is provided on the side of the flipping part facing the fixed part, and a rubber sleeve is provided at the end of the flipping part.

8. The multifunctional concrete expansion agent corrugated pipe shrinkage measuring device according to claim 6, characterized in that: A first reserved groove is provided at the bottom of the base and on the side away from the fixed abutment. The folding support frame is disposed inside the first reserved groove, and the depth of the first reserved groove is greater than the thickness of the folding support frame after folding.

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