A positioning device for non-contact measurement of expansion and shrinkage deformation of concrete

Abstract

The present invention relates to the technical field of concrete measurement, and particularly relates to a positioning device for non-contact measurement of the expansion and shrinkage deformation of concrete. In the present invention, the fixing unit is divided into a fixing mother bin and a measuring sub-bin. Through the attraction between a plurality of corresponding magnets installed between the fixing mother bin and the measuring sub-bin, the staff only needs to put the measuring sub-bin into the fixing mother bin to complete the positioning of the measuring sub-bin. At the same time, sponge sheets are also installed in the fixing mother bin and the measuring sub-bin to effectively absorb fine vibrations, thereby making the measurement results more accurate. The present invention also installs a scraping unit on the fixing mother bin. The slider drives the scraper to move, and the moving scraper levels the surface of the concrete in the measuring sub-bin. The scraping effect by using the scraping unit is also better than that of manual scraping, making the measurement results more accurate. At the same time, a large amount of manpower is saved and the work efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of concrete measurement, and in particular to a positioning device for measuring concrete expansion and contraction deformation using a non-contact method. Background Art

[0002] With the continuous improvement of my country's economic level, high-rise buildings can be seen everywhere in cities, and the completion of these high-rise buildings is inseparable from concrete; concrete is referred to as concrete, which is a general term for engineering composite materials in which aggregates are bonded into a whole by cementitious materials; general concrete refers to cement as cementitious material, sand and stone as aggregates, mixed with water in a certain proportion, and obtained by mixing, also known as ordinary concrete, which is widely used in civil engineering;

[0003] As people's demand for buildings increases, the demand for concrete also increases. However, as a building material, the safety requirements for it are also very high. Building materials mainly use concrete as the basic material, and shrinkage and expansion are its main deformation modes. The biggest apparent phenomenon is cracking and hollowing, which is also the main factor affecting the safety of building structures.

[0004] Concrete cracking will affect the structural strength, reducing the rigidity, shear force, tension, bending resistance and other strengths of the building structure; it will also affect the durability, causing leakage in the building structure and shortening the service life of the building structure; finally, it will affect the steel structure, and cracking will easily cause the steel bars to rust, which has a great impact on the safety of the building structure.

[0005] Concrete hollowing can cause large-scale cracks in the wall and cause the wall to fall off, which is not only unsightly but also poses a potential safety hazard. It can also prevent the finishing layer and the structural layer from being tightly combined, which may cause the finishing layer to fall off.

[0006] These are all hazards caused by the shrinkage and expansion of concrete itself. Therefore, before the concrete is used, the shrinkage and expansion of the concrete will be measured with a concrete shrinkage and expansion deformation measuring instrument. Only concrete that meets the standards in GBT50082-2009 will be put into use.

[0007] Therefore, the measurement of concrete shrinkage and expansion has become a top priority, and more and more measuring instruments have been invented. For example, the China Academy of Building Research invented a test method and test device for measuring the deformation performance of concrete without restraint (Publication No.: CN102866245B, Publication Date: April 22, 2015); Shenzhen Fan Hua Engineering Group Co., Ltd. invented a concrete thermal expansion coefficient measuring instrument (Publication No.: CN102435631B, Publication Date: October 2, 2013); China State Construction Engineering Corporation Limited, the Eighth Engineering Division invented a method for measuring the overall restraint deformation of a concrete frame structure under seasonal temperature differences (Publication No.: CN103630084B, Publication Date: January 11, 2017).

[0008] However, in the measurement of concrete shrinkage and expansion, it is necessary to position the concrete. However, in the traditional measurement process, manual placement is generally used for positioning. Since the position of each manual placement is different, it is necessary to manually position the non-contact method concrete shrinkage and expansion deformation measuring instrument each time to align it with the test mold. This increases the workload of the staff and is also prone to errors due to different manual operations.

[0009] At the same time, after the positioning is completed, it is necessary to manually scrape the concrete surface flat. Since the scraping form, strength, and method of each person are different, manual scraping will cause certain errors, that is, the method of ensuring flat scraping for each person is different, resulting in changes in the values of concrete expansion or contraction. At the same time, manual scraping is inefficient, and affected by subjectivity, the plane after scraping may not be flat, which will also cause differences in the measurement results.

[0010] Therefore, the present invention provides a positioning device for non-contact measurement of concrete expansion and contraction deformation, which can improve the above problems. Summary of the Invention

[0011] The technical problem to be solved by the present invention is to provide a positioning device for non-contact measurement of concrete expansion and contraction deformation. By dividing the fixing unit into two parts, the fixing mother bin and the measuring sub-bin, and installing magnets in the fixing mother bin and the measuring sub-bin, the problem of inaccurate positioning during measurement is effectively avoided through the attraction of the magnets. At the same time, by installing a scraping unit in the fixing mother bin, the effect of automatic scraping during positioning is achieved, effectively avoiding the problem of large measurement errors caused by manual scraping.

[0012] The present invention provides the following technical solution: A positioning device for non-contact measurement of concrete expansion and shrinkage deformation, comprising a bracket, a power unit, a control unit, a fixing unit, and a scraping unit. The bracket is fixedly installed on the ground and is used to support the control unit and the fixing unit. The power unit is welded below the bracket and is used to provide power. The control unit and the fixing unit are both fixed on the bracket by threaded nuts. The fixing unit is used to fix the concrete to be measured and position the concrete to be measured. The scraping unit is slidably installed on the fixing unit by a slider rail, and the scraping unit scrapes the surface of the concrete to be measured flat.

[0013] The fixing unit includes a fixing mother bin and a measuring sub-bin. The fixing mother bin is fixedly installed on the bracket and is used to fix the measuring sub-bin. The measuring sub-bin is installed in the fixing mother bin and is used to hold the concrete to be measured. Corresponding magnets are fixedly installed in both the fixing mother bin and the measuring sub-bin, and the magnets are used to adsorb the measuring sub-bin in the fixing mother bin.

[0014] The magnets are embedded in the fixing mother bin and the measuring sub-bin. The magnets embedded in the bottom surfaces of the fixing mother bin and the measuring sub-bin are much larger than the magnets embedded in the side surfaces. The fixing mother bin completely wraps the measuring sub-bin, and at the same time, the positioning work is completed by the magnetic force adsorption between the fixing mother bin and the measuring sub-bin. The fixing mother bin and the measuring sub-bin are made of plastic materials.

[0015] The magnetic poles of the magnets in the fixing mother bin and the corresponding magnets in the measuring sub-bin are opposite to each other in pairs. Setting the magnets in the fixing mother bin and the measuring sub-bin to have opposite magnetic poles can better fix the measuring sub-bin in the fixing mother bin.

[0016] The magnetic pole of the magnet in the fixing mother bin that contacts the measuring sub-bin is the N pole, and the magnetic pole of the magnet in the measuring sub-bin that contacts the fixing mother bin is the S pole; or the magnetic pole of the magnet in the fixing mother bin that contacts the measuring sub-bin is the S pole, and the magnetic pole of the magnet in the measuring sub-bin that contacts the fixing mother bin is the N pole.

[0017] A movable bin door is installed on one side of the fixing mother bin. The movable bin door facilitates the staff to place the measuring sub-bin. The bin door is hinged to the fixing mother bin by a butterfly hinge, so that the bin door can rotate 90°.

[0018] The bin door is made of plastic material, and the butterfly hinge is made of iron butterfly hinge, and lubricating oil is applied regularly to prevent dust from accumulating in the butterfly hinge after long-term use, making it difficult to open and close the bin door.

[0019] The scraping unit includes pulleys, first sliders, a rotating shaft and a scraper. On both sides of the top surface of the fixed main bin, there are first sliding grooves, and there are two first sliding grooves which are symmetrical about the fixed main bin. The sliding grooves are used for the first sliders to slide therein; two pulleys are slidably connected in each of the first sliding grooves, and the pulleys are used to drive the first sliders to move on the first sliding grooves; above the pulleys, first sliders are fixedly installed, and the first sliders are used to drive the scraper to move; between the two first sliders, a rotating shaft is rotatably connected, and the rotating shaft is used to drive the scraper to perform a 180° flip; a scraper is fixedly connected to the rotating shaft, and the scraper is used to scrape the surface of the concrete to be measured flat;

[0020] The pulleys slide in the sliding grooves. At the same time, a shaft is installed between the pulleys, and holes are provided in the sliders. The shaft between the pulleys can rotate in the holes of the sliders, thereby driving the sliders to rotate; the rotating shaft is rotatably connected to the slider by a flange, and a scraper is welded on the rotating shaft.

[0021] Above the bin door, there is a second sliding groove, which corresponds to the first sliding groove and the second sliding groove is an arc-shaped sliding groove. The arc-shaped groove is used to increase the height of the scraper, so that the scraper can perform secondary scraping on the concrete surface without damaging the already scraped flat concrete surface;

[0022] The second sliding groove is cut on the bin door by workers using a cutting machine and a drilling machine. At the same time, the second sliding groove corresponds to the first sliding groove one by one, and the slide rail in the second sliding groove is arc-shaped, and the roller can slide on the arc-shaped slide rail to raise the height of the scraper.

[0023] On one side of the fixed main bin close to the collection bucket, there is an arc-shaped groove, which is convenient for the excess concrete to fall into the collection bucket; on the back of the fixed main bin, a collection bucket is fixedly installed, and the collection bucket is used to collect the excess concrete scraped by the scraper;

[0024] The arc-shaped groove is cut by a cutting machine, polished by a grinding machine after cutting, polished after grinding, and then a layer of solid glue is applied to make its surface smoother. The collection bucket is fixed by bolts, that is, 4 threaded holes are chiseled in the fixed main bin, and then connected by threaded bolts to fix the collection barrel on the fixed main bin.

[0025] A sponge sheet is fixedly installed between the fixed main bin and the measuring sub-bin. Installing a sponge sheet between the fixed main bin and the measuring sub-bin is used to ensure the stability of the measuring sub-bin. Since the measuring sub-bin needs to be kept stationary during the whole measuring process, installing a sponge sheet between the fixed main bin and the measuring sub-bin can effectively absorb fine vibrations, thereby making the measuring result more accurate.

[0026] The sponge sheet is made of polyurethane sponge with slow rebound elasticity, and the sponge is connected to the fixed main bin by glue.

[0027] On the side of the fixed main bin and the side of the bin door, there are corresponding conductive sheets fixedly installed. The conductive sheets are electrically connected to the scraping unit, and the conductive sheets are used for contact to connect the circuit in the scraping unit;

[0028] The conductive sheets are fixed on one side of the fixed main bin and one side of the bin door through small bolts. The conductive sheets are made of copper alloy.

[0029] The fixing unit includes a fixed main bin and a measuring sub-bin. The fixed main bin is fixedly installed on the bracket, and the fixed main bin is used to fix the measuring sub-bin; A third chute is opened in the fixed main bin, and a second slider is fixedly installed in the measuring sub-bin. The second slider slides in the chute, that is, the measuring sub-bin is slidably installed in the fixed main bin;

[0030] The fixed main bin is fixed on the bracket by a threaded nut, and a third chute is opened in the fixed main bin by a cutting machine and a drilling machine; The measuring sub-bin and the second slider are integrally formed by stamping. The second slider slides in the chute, thereby fixing the measuring sub-bin in the fixed main bin.

[0031] The beneficial effects of the present invention are as follows:

[0032] 1. In the present invention, by dividing the fixing unit into two parts, namely a fixed main bin and a measuring sub-bin, through the attraction between multiple corresponding magnets installed between the fixed main bin and the measuring sub-bin, the staff only needs to put the measuring sub-bin into the fixed main bin to complete the positioning of the measuring sub-bin; At the same time, sponge sheets are also installed in the fixed main bin and the measuring sub-bin, which can effectively absorb fine vibrations, thereby making the measurement results more accurate.

[0033] 2. In the present invention, by installing a scraping unit on the fixed main bin, the motor in the scraping unit rotates, the motor drives the pulley to move in the first chute, the pulley drives the first slider to move in the first chute, the movement of the first slider drives the scraper to move, and the moving scraper levels the concrete surface in the measuring sub-bin; Compared with manual scraping, the efficiency is higher, and at the same time, the effect of scraping by using the scraping unit is also better than that of manual scraping, which will make the measurement results more accurate; At the same time, a large amount of manpower is saved and the work efficiency is improved. Description of the Drawings

[0034] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0035] Figure 1Overall schematic diagram of the present invention;

[0036] Figure 2 Schematic diagram of the fixing unit of the present invention;

[0037] Figure 3 Schematic diagram of the magnet position of the present invention;

[0038] Figure 4 Schematic diagram of the storage door of the present invention;

[0039] Figure 5 Schematic diagram of the scraping unit of the present invention;

[0040] Figure 6 Enlarged view of the pulley position of the present invention;

[0041] Figure 7 Schematic diagram of the paths of the first chute and the second chute of the present invention;

[0042] Figure 8 Schematic diagram of the positions of the groove and the collection bucket of the present invention;

[0043] Figure 9 Schematic diagram of the position of the sponge sheet of the present invention;

[0044] Figure 10 Schematic diagram of the position of the third chute of the present invention;

[0045] Figure 11 Schematic diagram of the installation relationship of the fixing unit of the present invention.

[0046] In the figure: support 1, fixing unit 2, fixing mother bin 21, measuring sub-bin 22, magnet 23, storage door 24, handle 25, first chute 26, second chute 27, third chute 28, second slider 29, scraping unit 3, pulley 31, first slider 32, rotating shaft 33, scraping plate 34, circular arc groove 35, collection bucket 36, sponge sheet 4, conductive sheet 5. Detailed implementation manner

[0047] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings of the specification and specific implementation manners.

[0048] When measuring multiple groups of concrete, since there are a relatively large number of measurement groups to be operated, a convenient and fast positioning device is required, and Example 1 exactly meets this requirement and can position it conveniently and quickly;

[0049] Example 1: As Figures 1 to 3As shown in the figure, a positioning device for non-contact measurement of concrete expansion and shrinkage deformation according to the present invention includes a bracket 1, a power unit, a control unit, a fixing unit 2 and a scraping unit 3. The bracket 1 is fixedly installed on the ground, and the bracket 1 is used to provide support for the control unit and the fixing unit 2; the power unit is fixedly installed below the bracket 1, and the power unit is used to provide power; the control unit and the fixing unit 2 are both fixedly installed on the bracket 1, and the fixing unit 2 is used to fix the concrete to be measured and position the concrete to be measured; the scraping unit 3 is slidably installed on the fixing unit 2, and the scraping unit 3 scrapes and levels the surface of the concrete to be measured.

[0050] The fixing unit 2 includes a fixing mother bin 21 and a measuring son bin 22. The fixing mother bin 21 is fixedly installed on the bracket 1, and the fixing mother bin 21 is used to fix the measuring son bin 22; the measuring son bin 22 is installed in the fixing mother bin 21, and the measuring son bin 22 is used to hold the concrete to be measured; a corresponding magnet 23 is fixedly installed in each of the fixing mother bin 21 and the measuring son bin 22, and the magnet 23 is used to adsorb the measuring son bin 22 in the fixing mother bin 21;

[0051] During operation, the staff pours the pre-solidified concrete into the measuring son bin 22 and places the measuring son bin 22 into the fixing mother bin 21. Due to the corresponding magnets 23 in the fixing mother bin 21 and the measuring son bin 22, the measuring son bin 22 is firmly adsorbed in the fixing mother bin 21; compared with the traditional non-contact method for measuring concrete expansion and shrinkage deformation, only one test mold is used, and initial setting is carried out under the constant temperature and humidity conditions of (20±2)°C and relative humidity of (60±5)%. Since the test mold can be moved and is placed manually each time, the position of each manual placement is different. Therefore, each time manual positioning of the non-contact concrete shrinkage and expansion deformation measuring instrument is required to align it with the test mold; however, with the method of using the fixing mother bin 21 and the measuring son bin 22, since the fixing mother bin 21 is fixed, the staff only needs to place the measuring son bin 22 into the fixing mother bin 21 to complete the positioning of the measuring son bin 22; at the same time, since multiple corresponding magnets 23 are installed between the fixing mother bin 21 and the measuring son bin 22, the stability of the measuring son bin 22 can also be ensured during the measurement process, making the measurement result more accurate.

[0052] On the basis of the above Embodiment 1, as Figure 3 shown, the magnetic poles of the magnets 23 in the fixing mother bin 21 and the corresponding magnets 23 in the measuring son bin 22 are opposite to each other; setting the magnets 23 in the fixing mother bin 21 and the measuring son bin 22 to opposite magnetic poles can better fix the measuring son bin 22 in the fixing mother bin 21;

[0053] Magnets 23 are installed on both the inner side and the bottom surface of the fixed main bin 21. At the same time, magnets 23 of the same size and corresponding one by one to those in the fixed main bin 21 are also installed in the measuring sub-bin 22. Meanwhile, the magnets 23 on the bottom surface are larger than those on the side surface. Since the magnetic poles of the magnets 23 in the fixed main bin 21 and the corresponding magnets 23 in the measuring sub-bin 22 are opposite to each other in pairs, when the measuring sub-bin 22 is placed in the fixed main bin 21 chamber, it is subjected to the attractive force of the magnets 23. However, since the magnets 23 are of the same size, the attractive forces generated by the magnets 23 are also the same. Therefore, the attractive force of the magnets 23 can fix the measuring sub-bin 22 in the exact middle of the fixed main bin 21, and at the same time, this can also make the measuring sub-bin 22 more stable when being measured.

[0054] Based on the above-mentioned Embodiment 1, as Figure 4 shown, a movable bin door 24 is installed on one side of the fixed main bin 21. The movable bin door 24 facilitates the staff to place the measuring sub-bin 22. The bin door 24 and the fixed main bin 21 are hinged by a butterfly hinge, so that the bin door 24 can rotate 90°. A handle 25 is fixedly installed on the bin door 24, and the handle 25 is used to more easily open and close the bin door 24.

[0055] Since the positioning device needs to be used multiple times, a movable bin door 24 is installed to facilitate the staff to put the measuring sub-cylinder into the fixed cylinder. At the same time, compared with other connection methods, the connection by a butterfly hinge requires less space and has a longer service life.

[0056] Based on the above-mentioned Embodiment 1, as Figures 5 to 7 shown, the scraping unit 3 includes a pulley 31, a first slider 32, a rotating shaft 33 and a scraping plate 34. Two first chutes 26 are opened on both sides of the top surface of the fixed main bin 21. There are two first chutes 26 and they are symmetric about the fixed main bin 21. The chutes are used for the first slider 32 to slide therein. Two pulleys 31 are slidably connected in each first chute 26, and the pulleys 31 are used to drive the first slider 32 to move on the first chute 26. The first slider 32 is fixedly installed above the pulley 31, and the first slider 32 is used to drive the scraping plate 34 to move. A rotating shaft 33 is rotatably connected between the two first sliders 32, and the rotating shaft 33 is used to drive the scraping plate 34 to perform a 180° flip. The scraping plate 34 is fixedly connected to the rotating shaft 33, and the scraping plate 34 is used to scrape the surface of the concrete to be measured flat.

[0057] When the scraping unit 3 works, the motor (not shown in the figure) in the first slider 32 rotates. The motor drives the pulley 31 to move in the first chute 26. The pulley 31 drives the first slider 32 to move in the first chute 26. The movement of the first slider 32 drives the scraping plate 34 to move. The moving scraping plate 34 scrapes the surface of the concrete in the measuring sub-bin 22 flat.

[0058] When measuring the expansion and shrinkage deformation of concrete by the traditional non-contact method, it is often necessary to manually scrape the concrete surface flat. Since the scraping forms, forces, and methods of each person are different, manual scraping will cause certain errors. That is, the ways for each person to ensure a flat scraping are different, resulting in changes in the values of concrete expansion or shrinkage. When using the scraping unit 3 for scraping, the efficiency is higher than that of manual scraping. At the same time, the scraping effect of using the scraping unit 3 is also better than that of manual scraping, which will make the measurement results more accurate.

[0059] Based on the above-mentioned Embodiment 1, as Figure 7 shown, a second chute 27 is provided above the bin door 24. The second chute 27 corresponds to the first chute 26 and the second chute 27 is an arc-shaped chute. The arc-shaped groove 35 is used to increase the height of the scraper 34, so that the scraper 34 can perform secondary scraping on the concrete surface without damaging the already scraped flat concrete surface.

[0060] Since there are certain solid particles in the concrete, when the scraper 34 scrapes the surface flat for the first time, some solid particles will be scraped off, resulting in some small pits on the concrete surface. Therefore, secondary scraping is required. During the secondary scraping process, the scraper 34 will scrape the excess concrete into the pits on the concrete surface, thus filling the small pits on the concrete surface. Therefore, by setting an arc-shaped chute above the bin door 24, the first slider 32 can raise the scraper 34 when sliding in the second chute 27, so that the scraper 34 will not affect the already scraped concrete surface when rotating 180° driven by the motor (not shown in the figure) through the rotating shaft 33.

[0061] Based on the above-mentioned Embodiment 1, as Figure 8 shown, an arc-shaped groove 35 is provided on the side of the fixed mother bin 21 close to the collection bucket 36. The arc-shaped groove 35 facilitates the excess concrete to fall into the collection bucket 36. A collection bucket 36 is fixedly installed on the back of the fixed mother bin 21. The collection bucket 36 is used to collect the excess concrete scraped by the scraper 34.

[0062] Since the scraper 34 of the scraping unit 3 performs secondary scraping, when the scraper 34 performs secondary scraping, the excess concrete is pushed to one side of the back of the fixed mother bin 21. Therefore, by providing an arc-shaped groove 35 on the side close to the collection cylinder, the excess concrete can automatically fall into the collection bucket 36, which is convenient for collecting the excess concrete to avoid difficult cleaning after the concrete solidifies on the positioning device.

[0063] Based on the above-mentioned Embodiment 1, as Figure 9As shown, a sponge sheet 4 is fixedly installed between the fixed mother bin 21 and the measuring son bin 22. Installing the sponge sheet 4 between the fixed mother bin 21 and the measuring son bin 22 is used to ensure the stability of the measuring son bin 22. Since the measuring son bin 22 needs to be kept stationary during the whole measuring process, installing the sponge sheet 4 between the fixed mother bin 21 and the measuring son bin 22 can effectively absorb minute vibrations, thereby making the measuring result more accurate.

[0064] Based on the above-mentioned Embodiment 1, as Figure 4 shown, corresponding conductive sheets 5 are fixedly installed on the side of the fixed mother bin 21 and the side of the bin door 24. The conductive sheets 5 are electrically connected to the scraping unit 3. The conductive sheets 5 are used for contact to connect the circuit in the scraping unit 3;

[0065] When the bin door 24 is closed, the conductive sheets 5 on the side of the fixed mother bin 21 and the side of the bin door 24 are in contact, and the circuit in the scraping unit 3 is connected and starts to work; when the bin door 24 is opened, the conductive sheets 5 on the side of the fixed mother bin 21 and the side of the bin door 24 are in contact, and the circuit in the scraping unit 3 is disconnected and stops working.

[0066] In Embodiment 1, using a magnet can facilitate quick positioning, but it has a defect that the magnetism of the magnet will gradually weaken as the usage time increases. Therefore, when using a single device to measure the expansion and shrinkage of concrete, the method of Embodiment 2 can be adopted;

[0067] Embodiment 2: As Figures 10 to 11 shown, for a positioning device for non-contact measurement of concrete expansion and shrinkage deformation according to the present invention, the fixing unit 2 includes a fixed mother bin 21 and a measuring son bin 22. The fixed mother bin 21 is fixedly installed on the bracket 1. The fixed mother bin 21 is used to fix the measuring son bin 22; a third sliding groove 28 is opened in the fixed mother bin 21, and a second slider 29 is fixedly installed in the measuring son bin 22. The second slider 29 slides in the sliding groove, that is, the measuring son bin 22 is slidably installed in the fixed mother bin 21;

[0068] When fixing the measuring son bin 22 in the fixed mother bin 21, in Embodiment 1, a magnet 23 is used for adsorption to fix the measuring son bin 22 in the fixed bin. This fixing method is relatively convenient, that is, putting the measuring son bin 22 into the fixed mother bin 21 can automatically position and fix it. This implementation method is suitable for use when measuring various concretes, that is, it is convenient for disassembly and can be used when there are many groups of measuring devices; if it is used in a single device, since the magnetic force of the magnet 23 becomes smaller as time goes by, the fixing method of Embodiment 2 can be adopted in a single device;

[0069] Example 1 is more convenient and faster to operate than Example 2, but its measurement accuracy will be affected after a long time; Example 2 has more accurate measurement results than Example 1, but the operation is more cumbersome than that of Example 1.

[0070] During operation, the staff pours the concrete before solidification into the measuring sub-chamber 22. Subsequently, the staff opens the chamber door 24 and places the measuring sub-chamber 22 into the fixed mother chamber 21. Due to the magnets 23 corresponding one by one in the fixed mother chamber 21 and the measuring sub-chamber 22, the measuring sub-chamber 22 is firmly adsorbed inside the fixed mother chamber 21. Subsequently, the staff turns on the power and closes the chamber door 24. After the chamber door 24 is closed, the conductive sheet 5 is connected, and the motor (not shown in the figure) drives the first slider 32 to move from the first slide rail to the second slide rail; that is, the scraper 34 moves forward to level the concrete surface. When the first slider 32 moves into the second slide rail, the rotating shaft 33 drives the scraper 34 to rotate for the second scraping. When the first slider 32 moves to the starting position, it stops, and the scraper 34 scrapes the excess concrete into the collection box. At this time, the positioning device for measuring the expansion and contraction deformation of concrete by the contact method completes its work, and then the non-contact concrete shrinkage and expansion deformation measuring instrument measures the shrinkage and expansion of the concrete.

[0071] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A positioning device for non-contact measurement of concrete expansion and shrinkage deformation, comprising a bracket (1), a power unit, a control unit, a fixing unit (2) and a scraping unit (3), characterized in that, The bracket (1) is fixedly installed on the ground, and the bracket (1) is used to support the control unit and the fixing unit (2); the power unit is fixedly installed below the bracket (1), and the power unit is used to provide power; the control unit and the fixing unit (2) are both fixedly installed on the bracket (1), and the fixing unit (2) is used to fix the concrete to be measured and position the concrete to be measured; the scraping unit (3) is slidably installed on the fixing unit (2), and the scraping unit (3) scrapes and levels the surface of the concrete to be measured. The fixing unit (2) includes a fixing mother bin (21) and a measuring son bin (22). The fixing mother bin (21) is fixedly installed on the bracket (1), and the measuring son bin (22) is installed in the fixing mother bin (21); corresponding magnets (23) are fixedly installed in both the fixing mother bin (21) and the measuring son bin (22). The magnetic poles of the magnets (23) in the fixing mother bin (21) and the corresponding magnets (23) in the measuring son bin (22) are opposite to each other in pairs. A movable bin door (24) is installed on one side of the fixing mother bin (21), and the bin door (24) is hinged to the fixing mother bin (21) by a butterfly hinge; a handle (25) is fixedly installed on the bin door (24). The scraping unit (3) includes pulleys (31), a first slider (32), a rotating shaft (33) and a scraping plate (34). On both sides of the top surface of the fixing mother bin (21), first chutes (26) are opened. There are two first chutes (26) and they are symmetric about the fixing mother bin (21); two pulleys (31) are slidably connected in each first chute (26), and a first slider (32) is fixedly installed above the pulleys (31); a rotating shaft (33) is rotatably connected between the two first sliders (32), and a scraping plate (34) is fixedly connected to the rotating shaft (33). A second chute (27) is opened above the bin door (24). The second chute (27) corresponds to the first chute (26) and the second chute (27) is an arc-shaped chute. An arc-shaped groove (35) is opened on one side of the fixing mother bin (21) close to the collection bucket (36); a collection bucket (36) is fixedly installed on the back of the fixing mother bin (21).

2. The positioning device for non-contact measurement of concrete expansion and shrinkage deformation according to claim 1, wherein: A sponge sheet (4) is fixedly installed between the fixing mother bin (21) and the measuring son bin (22).

3. The positioning device for non-contact measurement of concrete expansion and shrinkage deformation according to claim 2, characterized in that: Corresponding conductive sheets (5) are fixedly installed on the side surfaces of the fixing mother bin (21) and the bin door (24), and the conductive sheets (5) are electrically connected to the scraping unit (3).

4. The positioning device for non-contact measurement of concrete expansion and shrinkage deformation according to claim 3, characterized in that: The fixing unit (2) includes a fixing mother bin (21) and a measuring son bin (22). The fixing mother bin (21) is fixedly installed on the bracket (1), a third chute (28) is opened in the fixing mother bin (21), a second slider (29) is fixedly installed in the measuring son bin (22), and the second slider (29) slides in the chute, that is, the measuring son bin (22) is slidably installed in the fixing mother bin (21).

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