Concrete deformation testing device
By designing a concrete deformation testing device with a combination of pulley support and limiting plate, the problems of specimen end detachment and frictional resistance affecting testing accuracy were solved, realizing high-precision automatic measurement of multiple sets of specimens and improving testing efficiency and accuracy.
Patent Information
- Application Number
- CN202422978549.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-04
- Publication Date
- 2025-10-31
- Estimated Expiration
- 2034-12-04
AI Technical Summary
In existing concrete shrinkage and expansion meters, the ends of the specimens tend to detach from the supports during horizontal testing, affecting the testing accuracy. Furthermore, some instruments generate resistance to specimen deformation, leading to inaccurate test results.
A concrete deformation testing device was designed, which adopts a combination structure of pulley support, limiting plate and fixing plate. The specimen is kept in contact with the fixing plate by elastic element and push plate. Combined with locking structure and sleeve positioning, it is ensured that the end of the specimen is always in contact with the fixing plate during the deformation process, reducing frictional resistance and achieving accurate positioning.
It improves the accuracy and efficiency of concrete specimen deformation testing, ensures data accuracy when multiple specimens are measured simultaneously, reduces the influence of external forces on specimen deformation, and is easy to operate.
Smart Images
Figure CN223500332U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of concrete deformation monitoring instruments, and in particular to a concrete deformation testing 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. Therefore, it is necessary to measure the shrinkage rate of concrete during the concrete development process. A concrete shrinkage expansion meter is an instrument used to determine the length or volume change of concrete specimens under specified temperature and humidity conditions. It usually includes a specimen mounting support and a testing fixture. During the experiment, one end of the specimen contacts the fixed end of the support, and the other end contacts the testing fixture. The concrete shrinkage expansion meter can be used for vertical testing and horizontal testing.
[0003] The problem with existing horizontal testing equipment is that when concrete specimens shrink and deform, the ends of the specimens are prone to detach from the fixed end of the support, and the specimens cannot return to contact with the fixed end on their own, which affects the accuracy of the test results. Therefore, measuring multiple specimens at the same time can provide more accurate measurements. Some instruments use a surface contact method to position the bottom and sides of the specimen, which will generate a certain resistance to the deformation of the specimen and affect the accuracy of the test results. Summary of the Invention
[0004] The purpose of this invention is to address the problems existing in the prior art by providing a concrete deformation testing device with high testing accuracy and good specimen positioning effect.
[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a concrete deformation testing device, comprising a base and a limiting plate, wherein the limiting plate is slidably disposed on the top surface of the base, a locking structure is provided between the limiting plate and the base, an elastic element is provided on the limiting plate, the elastic element is connected to a push plate for engaging with the end face of a concrete specimen, a through-hole sleeve for slidably connecting the specimen nail head is provided through the limiting plate, a testing unit for engaging with the specimen nail head is provided on the limiting plate, a fixing plate is provided on the top surface of the base, a plurality of pulleys for supporting the concrete specimen are provided on the base, the pulleys are located between the fixing plate and the limiting plate, and a blind hole sleeve for slidably connecting the specimen nail head is provided on the fixing plate.
[0006] In the above scheme, the base is used to connect the limiting plate and the fixing plate, the locking structure is used to lock the relative position of the limiting plate and the base, the blind hole sleeve on the fixing plate and the through hole sleeve on the limiting plate are used to cooperate with the nail heads at both ends of the concrete specimen for axial positioning of the specimen. The specimen nail head at one end passes through the through hole sleeve and connects to the test unit. The limiting plate is connected to a push plate to push the concrete specimen towards the fixing plate side, so that the end of the concrete specimen always keeps in contact with the fixing plate during the deformation process. The base is equipped with pulleys to support the concrete specimen, so that the specimen can deform freely along the test direction and ensure the accuracy of the test results of the test unit.
[0007] Furthermore, the locking structure includes a positioning hole one on the top surface of the base and a positioning hole two on the limiting plate, and an adjustable positioning pin is provided between the positioning hole one and the positioning hole two.
[0008] The relative positions of the two are locked by setting a positioning pin between the positioning hole one on the base and the positioning hole two on the limiting plate. After removing the positioning pin, the limiting plate can be slid to make room for the installation and removal of concrete specimens.
[0009] Furthermore, the push plate is provided with a guide rod, which is slidably mounted on the limiting plate, and the elastic element is located on the outer ring of the guide rod.
[0010] The guide rod is slidably connected to the limiting plate to position the push plate and ensure the limiting effect of the push plate on the concrete specimen.
[0011] Furthermore, the push plate has a connecting hole in the middle for the specimen nail head to pass through, and the push plate is provided with several elastic elements.
[0012] A connecting hole is opened in the middle of the push plate, and the whole is a ring structure. Several elastic elements are set on the push plate to provide a uniform pushing force to the concrete specimen, so that the concrete specimen keeps in contact with the side of the fixed plate.
[0013] Furthermore, the top surface of the base is provided with several guide grooves, and the bottom of the limiting plate is provided with a connecting slider for cooperating with the guide grooves.
[0014] By setting a guide groove to slide and engage with the connecting slider at the bottom of the limiting part, the position adjustment of the limiting plate is facilitated.
[0015] Furthermore, the limiting plate is provided with a connecting post, and the test unit includes a slide block, on which a locking screw for cooperating with the connecting post is screwed.
[0016] The slide of the test unit slides into the connecting column, and the position between the slide and the connecting column is locked by the locking screw, which facilitates the axial position adjustment of the test unit.
[0017] Furthermore, the base is provided with several sets of pulleys along the horizontal direction, the limiting plate is provided with a test unit, a push plate and a through-hole sleeve corresponding to the position of the pulleys, and the fixing plate is provided with a blind hole sleeve corresponding to the position of the pulleys.
[0018] By setting up several sets of pulleys, along with corresponding test units, push plates, through-hole sleeves, and blind-hole sleeves, deformation tests on multiple concrete specimens can be performed simultaneously on the base. This method offers high testing efficiency and a simple structure. Testing multiple specimens under the same batch conditions ensures the accuracy of the test specimens.
[0019] Furthermore, the bottom of the base is provided with several inner support columns, and several height adjustment holes are provided on the inner support columns along the length direction. An outer support column is sleeved on the outside of the inner support columns, and a height adjustment hole is provided on the outer support column. A pin is detachably provided between the height adjustment hole and the height adjustment hole.
[0020] The height of the base is locked by setting a pin between the height adjustment hole one on the inner support column and the height adjustment hole two on the outer support column. The height can be adjusted by removing the pin.
[0021] Compared with the prior art, the beneficial effects of this utility model are:
[0022] (1) By setting pulleys on the base to support the bottom of the concrete specimen, the frictional resistance between the concrete specimen and the device during the deformation process is reduced. The elastic element and push plate set on the limiting plate are used to push the specimen to the fixed plate side to ensure the contact positioning of the specimen and the fixed plate side, and to ensure the test accuracy of the specimen deformation parameters.
[0023] (2) By setting blind hole sleeves on the fixed plate and through hole sleeves on the limiting plate to cooperate with the nail heads at both ends of the concrete specimen, the direction of the specimen is limited. At the same time, it does not directly contact the concrete part, reducing the influence of external force on the deformation of the concrete specimen. The positioning effect is good and the test accuracy is high.
[0024] (3) The position of the limiting plate is locked and unlocked by the locking structure, which makes it easy to adjust the position of the limiting plate for the installation and disassembly of concrete specimens. The operation is convenient.
[0025] (4) When measuring the shrinkage of concrete expansion agent specimens, multiple sets of automatic measurement data can be obtained, which is more accurate, time-saving and labor-saving, improving the measurement accuracy of concrete specimens and the work efficiency of personnel. Attached Figure Description
[0026] Figure 1 This is a three-dimensional structural view of a concrete deformation testing device according to the present invention.
[0027] Figure 2 This is a top view of the structure of a concrete deformation testing device according to the present invention;
[0028] Figure 3 This is a three-dimensional view of the push plate in this utility model;
[0029] Figure 4 This is a cross-sectional schematic diagram of one of the positioning holes in this utility model;
[0030] In the diagram: 1. Base; 2. Limiting plate; 3. Positioning hole one; 4. Positioning hole two; 5. Positioning pin; 6. Elastic element; 7. Push plate; 8. Specimen nail head; 9. Concrete specimen; 10. Through-hole sleeve; 11. Dial indicator; 12. Fixing plate; 13. Pulley; 14. Blind hole sleeve; 15. Guide rod; 16. Connecting hole; 17. Guide groove; 18. Connecting slider; 19. Connecting column; 20. Slide seat; 21. Locking screw; 22. Inner support column; 23. Height adjustment hole one; 24. Height adjustment hole two; 25. Pin; 26. Outer support column. Detailed Implementation
[0031] 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. Example
[0032] like Figure 1-4 As shown, a concrete deformation testing device includes a base 1 and a limiting plate 2. The limiting plate 2 is slidably disposed on the top surface of the base 1. A locking structure is provided between the limiting plate 2 and the base 1. An elastic element 6 is provided on the limiting plate 2. The elastic element 6 is connected to a push plate 7 for engaging with the end face of a concrete specimen 9. A through-hole sleeve 10 for slidingly connecting a specimen nail head 8 is provided through the limiting plate 2. A testing unit for engaging with the specimen nail head 8 is provided on the limiting plate 2. A fixing plate 12 is provided on the top surface of the base 1. A plurality of pulleys 13 for supporting the concrete specimen 9 are provided on the base 1. The pulleys 13 are located between the fixing plate 12 and the limiting plate 2. A blind hole sleeve 14 for slidingly connecting the specimen nail head 8 is provided on the fixing plate 12.
[0033] In the above scheme, the base 1 is used to connect the limiting plate 2 and the fixing plate 12. The locking structure is used to lock the relative position of the limiting plate 2 and the base 1. The blind hole sleeve 14 on the fixing plate 12 and the through hole sleeve 10 on the limiting plate 2 are used to cooperate with the nail heads at both ends of the concrete specimen 9 to perform axial positioning of the specimen. The specimen nail head 8 at one end passes through the through hole sleeve 10 and is connected to the test unit. The limiting plate 2 is connected to the push plate 7 to push the concrete specimen 9 towards the fixing plate 12 side, so that the end of the concrete specimen 9 always keeps in contact with the fixing plate 12 during the deformation process. The base 1 is equipped with a pulley 13 to support the concrete specimen 9, so that the specimen can deform freely along the test direction and ensure the accuracy of the test results of the test unit.
[0034] The testing unit includes a dial indicator 11. Multiple positioning holes 3 can be provided on the top surface of the base 1 to accommodate testing of concrete specimens 9 of various sizes. The pulley 13 is cylindrical and rotatably connected to the base 1.
[0035] Furthermore, the locking structure includes a positioning hole 3 on the top surface of the base 1 and a positioning hole 4 on the limiting plate 2, and an adjustable positioning pin 5 is provided between the positioning hole 3 and the positioning hole 4.
[0036] The relative positions of the two are locked by setting a positioning pin 5 between the positioning hole 3 of the base 1 and the positioning hole 4 of the limiting plate 2. After removing the positioning pin 5, the limiting plate 2 can be slid to make room for the installation and removal of the concrete specimen 9.
[0037] The positioning pin 5 can be screwed into the positioning hole 3, or it can be snapped into the positioning hole 3 and the positioning hole 4.
[0038] Furthermore, the push plate 7 is provided with a guide rod 15, which is slidably disposed on the limiting plate 2, and the elastic element 6 is located on the outer ring of the guide rod 15.
[0039] The guide rod 15 is slidably connected to the limiting plate 2 to position the push plate 7, ensuring the limiting effect of the push plate 7 on the concrete specimen 9.
[0040] The guide rod 15 is circular, and the limiting plate 2 has a circular hole that mates with the guide rod 15.
[0041] Furthermore, the push plate 7 has a connecting hole 16 in the middle for the specimen nail head 8 to pass through, and the push plate 7 is provided with a number of elastic elements 6.
[0042] A connecting hole 16 is opened in the middle of the push plate 7. The whole is a ring structure. Several elastic elements 6 are set on the push plate 7 to provide a uniform pushing force to the concrete specimen 9, so that the concrete specimen 9 keeps in contact with the side of the fixing plate 12.
[0043] The elastic element 6 includes a spring, and the two ends of the spring are fixed to the push plate 7 and the limiting plate 2, respectively.
[0044] Furthermore, the top surface of the base 1 is provided with a plurality of guide grooves 17, and the bottom of the limiting plate 2 is provided with a connecting slider 18 for cooperating with the guide grooves 17.
[0045] By setting the guide groove 17 to slide and engage with the connecting slider 18 at the bottom of the limiting part, the position adjustment of the limiting plate 2 is facilitated.
[0046] Furthermore, the limiting plate 2 is provided with a connecting post 19, and the test unit includes a slide 20, on which a locking screw 21 for cooperating with the connecting post 19 is screwed.
[0047] The slide 20 of the test unit is slidably engaged with the connecting column 19. The position between the slide 20 and the connecting column 19 is locked by the locking screw 21, which facilitates the axial position adjustment of the test unit.
[0048] Furthermore, the base 1 is provided with several sets of pulleys 13 along the horizontal direction, the limiting plate 2 is provided with a test unit, a push plate 7 and a through-hole sleeve 10 corresponding to the position of the pulleys 13, and the fixing plate 12 is provided with a blind hole sleeve 14 corresponding to the position of the pulleys 13.
[0049] By setting up several sets of pulleys 13, and correspondingly setting up test units, push plates 7, through-hole sleeves 10 and blind-hole sleeves 14, deformation tests on multiple concrete specimens 9 can be performed simultaneously on the base 1, resulting in high testing efficiency and a simple structure. Testing multiple specimens under the same batch conditions ensures the accuracy of the test specimens.
[0050] Furthermore, the bottom of the base 1 is provided with a plurality of inner support columns 22, and a plurality of height adjustment holes 23 are provided on the inner support columns 22 along the length direction. An outer support column 26 is sleeved on the outer side of the inner support columns 22, and a height adjustment hole 24 is provided on the outer support column 26. A pin 25 is detachably provided between the height adjustment holes 23 and the height adjustment holes 24.
[0051] The height of the base 1 is locked by setting a pin 25 between the height adjustment hole 23 on the inner support column 22 and the height adjustment hole 24 on the outer support column 26. The height can be adjusted by removing the pin 25.
[0052] The pin 25 includes a bolt and nut assembly.
[0053] 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 concrete deformation testing device, characterized in that, The device includes a base and a limiting plate. The limiting plate is slidably mounted on the top surface of the base and has a locking structure between it and the base. An elastic element is provided on the limiting plate, and a push plate connected to the elastic element is used to engage with the end face of a concrete specimen. A through-hole sleeve for slidingly connecting the specimen nail head is provided on the limiting plate. A testing unit for engaging with the specimen nail head is provided on the limiting plate. A fixing plate is provided on the top surface of the base, and several pulleys for supporting the concrete specimen are provided on the base. The pulleys are located between the fixing plate and the limiting plate. A blind-hole sleeve for slidingly connecting the specimen nail head is provided on the fixing plate.
2. The concrete deformation testing device according to claim 1, characterized in that, The locking structure includes a positioning hole one on the top surface of the base and a positioning hole two on the limiting plate, with an adjustable positioning pin between the positioning hole one and the positioning hole two.
3. The concrete deformation testing device according to claim 1, characterized in that, The push plate is provided with a guide rod, which is slidably mounted on the limiting plate, and the elastic element is located on the outer ring of the guide rod.
4. The concrete deformation testing device according to claim 3, characterized in that, The push plate has a connecting hole in the middle for the nail head of the test piece to pass through, and the push plate is provided with several elastic elements.
5. The concrete deformation testing device according to claim 1, characterized in that, The top surface of the base is provided with several guide grooves, and the bottom of the limiting plate is provided with a connecting slider for cooperating with the guide grooves.
6. The concrete deformation testing device according to claim 1, characterized in that, The limiting plate is provided with a connecting post, and the test unit includes a slide block with a locking screw screwed onto the slide block for cooperating with the connecting post.
7. The concrete deformation testing device according to claim 1, characterized in that, The base is provided with several sets of pulleys along the horizontal direction. The limiting plate is provided with a test unit, a push plate and a through-hole sleeve corresponding to the position of the pulleys. The fixing plate is provided with a blind hole sleeve corresponding to the position of the pulleys.
8. The concrete deformation testing device according to claim 1, characterized in that, The base has several inner support columns at its bottom. Several height adjustment holes are provided on the inner support columns along their length. An outer support column is fitted on the outer side of the inner support columns. A height adjustment hole is provided on the outer support column. A pin is detachably provided between the height adjustment holes and the height adjustment holes.