Testing device for detecting VC value of roller compacted concrete

Abstract

The utility model discloses a test device for detecting the VC value of roller compacted concrete, and belongs to the technical field of concrete construction. Comprising a ring body and a pressing plate arranged in the ring body from top to bottom. A vibration motor is arranged on the pressing plate; the pressing plate is further provided with a plurality of balancing weights. According to the test device for detecting the VC value of the roller compacted concrete, the problem that the Veibog consistometer needs to be mounted at a fixed place is solved; a traditional test mode is subverted, and the device is adjusted to be in an upper vibration state, so that the whole device becomes a portable instrument.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of concrete construction, especially to a test device for roller compacted concrete VC value detection. BACKGROUND

[0002] Roller compacted concrete is widely used in the construction of hydropower stations due to its fast construction speed and low cost. VC value detection of roller compacted concrete is an important indicator for controlling the production quality of roller compacted concrete. Clear control requirements need to be proposed during the design stage, and detection needs to be performed according to the frequency during the construction stage to ensure the construction quality of roller compacted concrete.

[0003] Taking the "Hydraulic Concrete Test Regulations (SL 352-2020)" as an example, the VC value of roller compacted concrete is detected using a Veeb consistency meter. The Veeb consistency meter mainly consists of a vibration table, a volume cylinder, a plastic pressing plate, a rotating frame, and the like. The auxiliary tools include a tamping rod, a stopwatch, a spatula, a small iron shovel, and the like. When performing VC value detection, the aggregate with a particle size greater than 40 mm is screened out using a wet sieve method, and the sample after wet screening is sampled according to the four-part method and is loaded into the volume cylinder in two layers. The tamping rod is screwed and inserted for 25 times for each layer, and the surface is leveled after the loading is completed. The volume cylinder is fixed on the vibration table, and the pressing plate, the counterweight, and the like are placed on the surface of the mixture. The slide bar is fixed using the slide bar fastening bolt. The slide bar fastening bolt is loosened, the vibration table is started at the same time, and the timing is started. The timing is stopped and the vibration table is stopped until the cement paste appears under the pressing plate. The vibration time (s) is read, and the average value of two measurement values is taken as the VC value of the roller compacted concrete mixture.

[0004] This method is suitable for detecting the VC value of the roller compacted concrete mixture in the test room after sampling. The sampling needs to be performed at the Veeb consistency meter, and the sampling quantity is large. According to the distance between the test rooms, a certain travel time is still required. After the test is completed, the test waste needs to be processed, which wastes manpower and material resources. In addition, frequent sampling is also a waste of materials. UTILITY MODEL CONTENTS

[0005] The utility model aims at solving the problems of fixed position, troublesome operation, and test material processing in the VC value detection of roller compacted concrete in the prior art, and provides a test device for roller compacted concrete VC value detection.

[0006] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0007] A test device for roller compacted concrete VC value detection, comprising a ring body and a pressing plate placed into the ring body from top to bottom.

[0008] A vibration motor is arranged on the pressing plate.

[0009] A plurality of counterweight blocks are further arranged on the pressing plate.

[0010] In some embodiments, the ring body is a metal ring with an upper and lower opening;

[0011] The lower end of the ring body is provided with a blade.

[0012] In some embodiments, the pressing plate is a transparent plate or a metal plate;

[0013] The outer diameter of the pressing plate is slightly smaller than the inner diameter of the ring body.

[0014] In some embodiments, further comprising a guide device;

[0015] The guide device comprises an inverted U-shaped bracket assembled on the outer side of the ring body, and a guide rod vertically fixed at the center position above the pressing plate;

[0016] The inverted U-shaped bracket is provided with a guide cylinder coaxially arranged on the crossbeam; the guide rod vertically slides through the guide cylinder.

[0017] In some embodiments, the guide rod is a hollow structure;

[0018] The wire of the vibration motor passes through the guide rod and is led outwards.

[0019] In some embodiments, the lower end of the two vertical beams of the inverted U-shaped bracket is detachably assembled with the ring body by bolts;

[0020] The outer side of the ring body is fixedly connected with a screw rod; after the lower end position of the inverted U-shaped bracket is opened and matched with the screw rod, a nut is locked.

[0021] In some embodiments, a notch is formed at the lower end position of the inverted U-shaped bracket;

[0022] The opening of the notch is horizontal or inclined upward.

[0023] In some embodiments, a temporary limiting hole is formed on the guide rod and the guide cylinder; a pin shaft is inserted into the temporary limiting hole;

[0024] Before the test starts, the guide cylinder is lifted up, the temporary limiting hole of the guide rod corresponds to the temporary limiting hole of the guide cylinder, and the pin shaft is temporarily fixed.

[0025] In some embodiments, the upper part of the guide rod is provided with an external thread and is assembled with an adjusting nut;

[0026] Before the test starts, the guide cylinder is lifted up by the adjusting nut.

[0027] In some embodiments, the counterweight is sleeved by a vertical rod fixed on the pressing plate.

[0028] Compared with the prior art, the roller compacted concrete VC value detection test device has the following beneficial effects.

[0029] 1、 The utility model discloses overcome the difficult problem that the vibritome needs to be installed at fixed place, provide a kind of roller compacted concrete VC value detection test device;Subvert traditional test mode, adjust to the mode of upper vibration, make its whole become a kind of portable instrument.

[0030] 2、The utility model discloses in the case where power supply is provided, after selecting test sample on site, it can be used;After test ends, sample is still in construction site, can continue to be used for roller compacted construction;Save sampling time, save manpower, material resources, avoid the waste of roller compacted concrete material etc.

[0031] 3、The utility model discloses break the prior art, change VC value detection mode, can carry out the detection of VC value on construction site fast;It improves test efficiency, accurately reflects the performance of on-site roller compacted concrete mixture;Meanwhile, save manpower, material resources, financial resources, with good application and popularization value.

[0032] Other advantages, objects and features of the utility model will be described in the subsequent specification to some extent;And to some extent, based on the study of the following text, it will be obvious to those skilled in the art;Or, can be taught from the practice of the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 It is the structural schematic diagram of the utility model.

[0034] Figure 2 It is the front view structural schematic diagram of the utility model.

[0035] Figure 3 It is the structural schematic diagram of setting guiding device state.

[0036] Figure 4 It is the front view structural schematic diagram of setting guiding device state.

[0037] Figure 5 It is the side view structural schematic diagram of setting guiding device state.

[0038] Figure 6 It is the top view structural schematic diagram of setting guiding device state.

[0039] Figure 7 It is the use state schematic diagram of setting guiding device state.

[0040] Figure 8 It is the lifting state schematic diagram of pressing plate.

[0041] Figure 9 is a structure schematic view of a ring body.

[0042] Figure 10 is a structure schematic view of an inverted U-shaped support.

[0043] in the figure:

[0044] 1, ring body; 2, pressing plate; 3, vibration motor; 4, counterweight; 5, inverted U-shaped support; 51, guide cylinder; 52, notch; 6, guide rod; 7, height adjusting nut. DETAILED DESCRIPTION

[0045] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application.

[0046] Embodiment one.

[0047] Referring to Figures 1-2 A test device for detecting the VC value of roller compacted concrete, comprising a ring body 1 and a pressing plate 2 inserted into the ring body 1 from top to bottom.

[0048] A vibration motor 3 is arranged on the pressing plate 2.

[0049] A plurality of counterweights 4 are further arranged on the pressing plate 2.

[0050] Preferably, the ring body 1 is made of steel material with certain strength and rigidity.

[0051] Optionally, the lower end of the ring body 1 is provided with a blade, which is more convenient for inserting into the concrete downward.

[0052] The pressing plate 2 is a transparent plate or a metal plate; the outer diameter of the pressing plate 2 is slightly smaller than the inner diameter of the ring body 1.

[0053] The vibration motor 3 is connected with the pressing plate 2 through bolts, gaskets and the like; and the installation position is controlled so as not to be eccentric during work; preferably, the vibration motor is an eccentric vibration motor, and the vibration frequency is (50±3) Hz.

[0054] The counterweights 4 are arranged in plurality, which are used for adjusting the coincidence of the overall center of gravity and the axis of the pressing plate 2; at the same time, the overall weight of the pressing plate 2 is adjusted and controlled; preferably, the mass is controlled to be (10.25±0.05) kg.

[0055] Preferably, the counterweights 4 are sleeved through the vertical rods fixed on the pressing plate 2.

[0056] As Figure 1 , 2As shown, four vertical rods are arranged on the two diameters of the pressing plate which are perpendicular to each other; the center hole of the counterweight 4; by adjusting the counterweight, the center of gravity balance of the whole is controlled.

[0057] In use, after the ring body 1 is embedded in the concrete, the pressing plate 2 is placed in place; power is generated by the vibration motor 3, and the time for the cement slurry to cover the lower surface of the pressing plate 2 or the time for the cement slurry to overflow from the edge of the pressing plate 2 is observed; and the VC value of the roller compacted concrete mixture is obtained through corresponding conversion.

[0058] It should be noted that since the previous detection method is completely overturned, instrument calibration is required to form the corresponding VC conversion.

[0059] Specifically:

[0060] 1), select the roller compacted concrete mixture with a VC value of about (3-5) s;

[0061] 2), use the Vicat apparatus to detect the VC value of the roller compacted concrete, detect not less than 3 times, and take the average value;

[0062] 3), use the test device to detect the VC1 value of the roller compacted concrete, detect not less than 3 times, and take the average value;

[0063] 4), then select the roller compacted concrete mixture with a VC value of about (8-10) s, and repeat the above detection;

[0064] 5), finally select the roller compacted concrete mixture with a VC value of about (13-15) s, and repeat the above detection;

[0065] 6), statistically analyze the VC value detection results of the three batches of roller compacted concrete, find the relationship between the results measured by the two instruments (VC-VC1), correct the detection results obtained by the device, form a conversion table or conversion formula, and realize the calibration.

[0066] In the field detection and use:

[0067] 1), turn on the power, and check whether the detection instrument is running normally;

[0068] 2), select the measurement area, the diameter of the measurement area is about 50 cm, and the depth is about 20 cm; remove the aggregate exceeding 40 mm in the measurement area, and use a shovel to flatten the measurement area;

[0069] 3), place the ring body 1 on the measurement area and press the ring body 1 into the measurement area;

[0070] 4), use a shovel to select the mixture without 40 mm aggregate and fill it into the ring body 1 in two layers, each layer is inserted and tamped 25 times with a tamping rod screw, and the surface is flattened after tamping is completed;

[0071] 5) Put the pressure plate 2 on the surface of the mixture in the ring 1;

[0072] 6) Turn on the switch and start timing;

[0073] 7) Record the time from the start to the cement paste covering the lower surface of the pressure plate (using a transparent pressure plate); or, record the time from the start to the cement paste overflowing from the edge of the pressure plate (using a non-transparent pressure plate);

[0074] 8) Use the calibrated results to correct the detected VC1 value;

[0075] 9) Select no less than two test areas for each test, take the average of the corrected results as the VC value of the roller compacted concrete mixture;

[0076] 10) After the test is completed, clean the instrument and return the device to its place for the next use.

[0077] The device is portable and can be carried to the pouring site; connect the power supply, which is consistent with the power supply of the site vibrating rod, and it can be used at any position in the bin after connection; when the roller compacted concrete reaches the site, randomly sample and test. Select the stones with a particle size of more than 40 mm in the sampling position range and flatten them with a shovel; press the steel ring into the flattened roller compacted concrete, and then fill the steel ring with a shovel; after inserting the vibrating rod, place the pressure plate 2 in the ring. Turn on the power supply at the same time and start timing; record the time required for the cement paste under the pressure plate to cover (or the time for the cement paste to overflow from the edge of the pressure plate); calculate the measured VC1 value of the roller compacted concrete, and after correction, the mixture VC value can be obtained.

[0078] Through the test device, the detection of the VC value of the roller compacted concrete mixture can be quickly completed at the pouring site, and the test results can truly reflect the state of the roller compacted concrete in the bin, which has guiding significance for the timely adjustment of the site production mix ratio and is beneficial to ensure the construction quality of the roller compacted concrete.

[0079] It can be understood that a stopwatch is provided for timing during use.

[0080] Example Two.

[0081] Reference Figures 3-10 Unlike the foregoing examples, it further includes a guide device.

[0082] The guide device includes an inverted U-shaped bracket 5 assembled on the outside of the ring 1, and a guide rod 6 vertically fixed at the center position above the pressure plate 2; at the same time, a guide cylinder 51 coaxial with the ring 1 is arranged on the crossbeam of the inverted U-shaped bracket 5; the guide rod 6 vertically slides through the guide cylinder 51.

[0083] As Figure 3 , 6As shown, the stability during the working process is controlled by the guide rod 6; so that the overall center of gravity of the pressing plate 2 is always coincident with the central axis of the ring body 1.

[0084] It should be noted that the axis of the guide rod 6 and the guide cylinder 51 coincides with the center of gravity line of the pressing plate 2; the guide rod 6 passes through the guide cylinder 51 and can slide freely in the guide cylinder 51.

[0085] Further, the guide rod 6 is a hollow structure; accordingly, the wires of the vibration motor 3 pass through the guide rod 6 and are led outwards.

[0086] It should be noted that the inverted U-shaped support 5 can also be used as a handle; it is convenient for personnel to carry the device and move around to change places for detection.

[0087] Example three.

[0088] It should be noted that in order to avoid the operation of adding concrete to the ring body 1, the position of the pressing plate 2 should not affect the experiment before the experiment; therefore, we set up a temporary corresponding structure for lifting on the basis of guiding.

[0089] Specifically, the guide rod 6 and the guide cylinder 51 are correspondingly provided with temporary limiting holes; the temporary limiting holes are inserted with a pin shaft. Before the test starts (before adding concrete to the ring body 1), the guide cylinder 51 is lifted up, the guide rod 6 corresponds to the temporary limiting hole of the guide cylinder 51, and the pin shaft is temporarily fixed.

[0090] As shown in Figure 3 , the overall pressing plate 2 is in a high position.

[0091] Example four.

[0092] Different from the foregoing examples, the temporarily raised corresponding structure is in the form of a screw thread.

[0093] Specifically, the upper part of the guide rod 6 is provided with external threads and is assembled with a height adjusting nut 7.

[0094] As shown in Figure 8 , before the test starts, the guide cylinder 51 is raised upwards by the height adjusting nut 7.

[0095] It should be noted that the external threads are set to be short, which can be matched with the nut to achieve quick locking and unscrewing.

[0096] Example five.

[0097] Different from the foregoing examples, we also set a quick release form for the inverted U-shaped support 5.

[0098] Specifically, the lower ends of the two vertical beams of the inverted U-shaped support 5 are detachably assembled with the ring body 1 through bolts; which is convenient for disassembly, assembly, storage and storage at any time.

[0099] Preferably, the outer side of the ring body 1 is fixedly connected with a screw rod, and the lower end position of the inverted U-shaped support 5 is provided with a hole matched with the screw rod, and a nut is assembled and locked.

[0100] It can be understood that the screw rod can also be provided with a hole, but a groove should be arranged inside or the position of the hole should be controlled so as to not interfere with the pressing plate 2.

[0101] Further, the lower end position of the inverted U-shaped support 5 is provided with a notch 52, and the opening of the notch 52 is horizontal or obliquely upward.

[0102] As shown in Figure 9 , 10 , through the notch 52, the inverted U-shaped support 5 is quickly clamped and matched with the screw rod, and then the nut is assembled and locked; when disassembled, some nuts are loosened, and the inverted U-shaped support 5 can be disassembled.

[0103] Further, in this state, the structure for temporarily lifting the pressing plate 2 can also not be arranged; before the concrete is added to the ring body 1, the inverted U-shaped support 5 is not installed; after the concrete is added, the inverted U-shaped support 5 is matched with the guide rod 6, the pressing plate 2 is placed in place, and then the inverted U-shaped support 5 is locked.

[0104] It should be noted that the operation time should be controlled.

[0105] It can be understood that the corresponding on-site detection and adjustment steps are adjusted.

[0106] 1) Turn on the power supply and detect whether the instrument is normally running;

[0107] 2) Select a measurement area with a diameter of about 50 cm and a depth of about 20 cm; remove the aggregate exceeding 40 mm in the measurement area, and use a shovel to level the measurement area;

[0108] 3) Place the ring body 1 on the measurement area and press the ring body 1 into the measurement area;

[0109] 4) Use a shovel to select the mixture without 40 mm aggregate and load it into the ring body 1 in two layers, and use a tamping rod to screw and tamp 25 times for each layer, and then level the surface after tamping is completed;

[0110] 5) Load the guide rod 6 into the guide cylinder 51, place the pressing plate 2 on the surface of the mixture in the ring body 1, and tighten the nut of the inverted U-shaped support 5;

[0111] 6) Turn on the switch and start timing at the same time;

[0112] 7) Record the time from the start to the cement paste covering the lower surface of the pressing plate (using a transparent pressing plate); or, record the time from the start to the cement paste overflowing from the edge of the pressing plate (using a non-transparent pressing plate);

[0113] 8) using the calibrated result to correct the detected VC1 value;

[0114] 9) selecting no less than two measuring areas for each test, and taking the average of the corrected results as the VC value of the roller compacted concrete mixture;

[0115] 10) after the test is completed, cleaning the instrument, and returning the device to its place for the next use.

[0116] The utility model discloses overcome the problem that the vibridity instrument needs to be installed at fixed place, provide a kind of test device for roller compacted concrete VC value detection;Subvert traditional test mode, adjust to the form of upper vibration, make its whole become a kind of portable instrument.

[0117] The utility model discloses in the case where providing power supply, after selecting test sample on site, it can be used;After test is completed, sample is still in construction site, can continue to be used for roller compaction construction;Save sampling time, save manpower, material resources, avoid the waste of roller compacted concrete material etc.

[0118] The utility model discloses break the prior art, change VC value detection mode, can carry out the detection of VC value on construction site quickly;It, improve test efficiency, accurately reflect the performance of on-site roller compacted concrete mixture;Meanwhile, save manpower, material resources, financial resources, with good application and popularization value.

[0119] The above, just for the preferable specific embodiment of the utility model, but the protection scope of the utility model is not limited to this, any skilled person in the art in the technical range disclosed by the utility model, according to the technical scheme of the utility model and the utility model conception add up to equivalent replacement or change, all should be covered in the protection scope of the utility model.

[0120] In the description of the present specification, the description of the reference terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In the present specification, the illustrative description of the above terms is not necessarily for the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, the skilled in the art can combine and combine the different embodiments or examples described in the present specification and the characteristics of different embodiments or examples without contradiction.

[0121] Although the embodiments of the utility model have been shown and described above, it can be understood that the above-mentioned embodiments are exemplary and cannot be understood as limiting the utility model, and the ordinary skilled in the art can change, modify, replace and transform the above-mentioned embodiments within the scope of the utility model.

Claims

1. A testing device for detecting the VC value of roller-compacted concrete, characterized in that, It comprises a ring body (1) and a pressing plate (2) inserted into the ring body (1) from top to bottom; A vibration motor (3) is arranged on the pressing plate (2); A plurality of counterweights (4) are further arranged on the pressing plate (2).

2. The test device for detecting a Vee-Content (VC) value of roller compacted concrete according to claim 1, wherein The ring body (1) is a metal ring with an upper and lower opening; The lower end of the ring body (1) is provided with a blade edge.

3. The test device for detecting the Vc value of roller compacted concrete according to claim 1, characterized by The pressing plate (2) is a transparent plate or a metal plate; The outer diameter of the pressing plate (2) is slightly smaller than the inner diameter of the ring body (1).

4. The test device for detecting the Vc value of roller compacted concrete according to claim 1, characterized by It further comprises: A guide device; The guide device comprises an inverted U-shaped support (5) assembled on the outer side of the ring body (1) and a guide rod (6) vertically fixed at the center position above the pressing plate (2); A guide cylinder (51) is coaxially arranged on the crossbeam of the inverted U-shaped support (5) and the ring body (1); the guide rod (6) vertically penetrates the guide cylinder (51).

5. The test device for detecting the Vc value of roller compacted concrete according to claim 4, characterized by The guide rod (6) is a hollow structure; The wire of the vibration motor (3) penetrates the guide rod (6) and is led outwards.

6. The test device for detecting the Vc value of roller compacted concrete according to claim 4, characterized by The lower ends of the two vertical beams of the inverted U-shaped support (5) are detachably assembled with the ring body (1) through bolts; The outer side of the ring body (1) is fixedly connected with a screw rod, and the lower end position of the inverted U-shaped support (5) is provided with a hole which cooperates with the screw rod after locking the nut.

7. The test device for detecting the Vc value of roller compacted concrete according to claim 6, characterized by The lower end position of the inverted U-shaped support (5) is provided with a notch (52); The opening of the notch (52) is horizontal or inclined upward.

8. The test device for detecting the Vc value of roller compacted concrete according to claim 4, characterized by The guide rod (6) and the guide cylinder (51) are correspondingly provided with temporary limiting holes; a pin shaft is inserted into the temporary limiting hole; Before the test starts, the guide cylinder (51) is lifted up, and the temporary limiting holes of the guide rod (6) and the guide cylinder (51) are correspondingly arranged, and the pin shaft is temporarily fixed.

9. The test device for detecting the Vc value of roller compacted concrete according to claim 4, characterized by The upper part of the guide rod (6) is provided with external threads and is assembled with an adjusting nut (7); Before the test starts, the guide cylinder (51) is lifted up through the adjusting nut (7).

10. The test device for detecting a Vee-Content (VC) value of roller compacted concrete according to claim 1, wherein The counterweight (4) is sleeved through the vertical rod fixed on the pressing plate (2).

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