CN218470731U - Concrete shrinkage factor measuring device - Google Patents
Concrete shrinkage factor measuring device Download PDFInfo
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- CN218470731U CN218470731U CN202221778853.4U CN202221778853U CN218470731U CN 218470731 U CN218470731 U CN 218470731U CN 202221778853 U CN202221778853 U CN 202221778853U CN 218470731 U CN218470731 U CN 218470731U
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Abstract
The utility model discloses a concrete shrinkage measuring device, including sample box, amesdial, tight device in top, open the sample box inside has a sample groove that is used for holding the sample piece, still be equipped with in the sample groove and be used for reducing the sample piece with the gyro wheel of frictional force between the sample groove, the both ends of sample groove are equipped with upper datum plate and lower datum plate respectively; the jacking device comprises a jacking plate arranged between the upper reference plate and the lower reference plate in a sliding manner and an elastic device used for providing jacking force; the dial indicator body is fixedly arranged on an upper reference plate of the sample box, and the length of the sample block can be measured through the dial indicator. The utility model provides a lower benchmark board contact that this kind of concrete shrinkage factor measuring device can not only make coupon and sample box is inseparabler, can carry out real-time supervision to measuring result in the maintenance environment for a long time moreover, and measurement accuracy is higher.
Description
Technical Field
The utility model belongs to the technical field of the engineering survey, concretely relates to concrete shrinkage factor measuring device.
Background
The concrete is a very important civil engineering material at present, and is cement concrete which is prepared by using cement as a cementing material, using sand and stone as aggregate, mixing the cement concrete with water according to a certain proportion and stirring the mixture. The concrete has high compression strength, high durability and low cost, so that it is widely used in civil engineering. The concrete can deform under the action of load or temperature and humidity, and mainly comprises elastic deformation, plastic deformation, shrinkage, temperature deformation and the like. The volume deformation caused by cement hydration, cement stone carbonization, water loss and the like is called shrinkage, and the concrete shrinkage rate is one of important parameters for representing the quality of concrete.
The method for measuring the shrinkage rate of a concrete sample is characterized in that the length of the concrete sample is measured, the length of the concrete sample before curing is measured by a concrete shrinkage-expansion instrument, the concrete sample is cured for a period of time under corresponding humidity and temperature environments according to test requirements, the concrete sample is taken out and then measured by the concrete shrinkage-expansion instrument, the sample block needs to be repositioned every time of measurement, the sample block is pressed by hand, a shrinkage head of a dial gauge is aligned to a nail head pre-embedded in the sample block, and during actual test, slight deviation of the placement position of the sample block and small gaps can cause large change of a measured value, so that inaccurate measurement is easily caused.
Therefore, in the prior art, how to position and fix the sample block and improve the accuracy of measurement is one of the important problems to be solved urgently in the field.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a concrete rate of expansion measuring device solves prior art measuring result error big, can not carry out the technical problem that detects to concrete shrinkage length in real time.
The utility model discloses a realize like this:
a concrete shrinkage measuring device comprises a sample box, a jacking device and a dial indicator, wherein a sample groove for accommodating a sample block is formed in the sample box, and an upper reference plate and a lower reference plate which are vertical to the length direction of the sample groove are respectively arranged at two ends of the sample groove; the jacking device comprises a jacking plate arranged between the upper reference plate and the lower reference plate in a sliding manner and an elastic device used for providing jacking force to enable the sample block to be in closer contact with the lower reference plate of the sample box; and the dial indicator is fixedly arranged on the upper reference plate of the sample box and used for measuring the length of the sample block.
Preferably, the sample groove is a V-shaped groove with a V-shaped cross section; and a roller for reducing the friction force between the sample block and the V-shaped groove is also arranged in the V-shaped groove.
Preferably, the base comprises a bottom plate, a plurality of clamping grooves and a supporting rod, wherein the bottom plate is connected with the sample box in a rotating mode through a hinge, the clamping grooves are formed in the bottom plate and used for adjusting the inclination angle of the sample box, one end of the supporting rod is hinged with the sample box, and the other end of the supporting rod abuts against the clamping grooves.
Preferably, the dial indicator is an electronic dial indicator, and a signal transmitting device for remotely transmitting acquired data to the data acquisition unit is further arranged on the dial indicator.
Preferably, the elastic device is a tension spring, one end of the tension spring is arranged on the lower reference plate, and the other end of the tension spring is detachably connected with the jacking plate.
Preferably, the tightening device further comprises a guide rail arranged between the upper reference plate and the lower reference plate and parallel to the movement direction of the test block, and a slider fixed on the tightening plate and matched with the guide rail.
Preferably, the elastic device is an air pressure support rod, one end of the air pressure support rod is fixed on the upper reference plate, and the other end of the air pressure support rod is connected with the tightening plate.
Preferably, the middle parts of the two end surfaces of the sample block are also vertically provided with small jacks protruding outwards, and the small jacks and the lower reference plate are both made of hard materials.
The utility model provides a this kind of concrete shrinkage factor measuring device's beneficial effect is:
1. combine together through gyro wheel and top tight device, come to fix a position the coupon and push up tightly fixedly, compare the manual work and put, the position error of coupon is littleer, and the uniformity is higher, makes the coupon inseparabler with measuring device contact moreover, and measurement accuracy is more reliable.
2. The measurement result can be monitored in real time for a long time in the maintenance environment, and the measurement error caused by transferring and putting again for fixation is effectively avoided.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic view of an overall structure of a concrete shrinkage measuring apparatus according to an embodiment of the present invention;
fig. 2 is a cross-sectional view of a concrete shrinkage measuring apparatus according to an embodiment of the present invention;
fig. 3 is a schematic view of an overall structure of a concrete shrinkage rate measuring apparatus provided by the second embodiment of the present invention;
fig. 4 is a cross-sectional view of a concrete shrinkage measuring apparatus according to a second embodiment of the present invention;
fig. 5 is a schematic view of an operating state of a concrete shrinkage measuring apparatus according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a sample block in a concrete shrinkage measuring device provided by the embodiment of the utility model.
In the figure: 1-dial gauge, 101-telescopic probe, 2-sample box, 201-sample groove, 202-upper reference plate, 203-lower reference plate, 204-roller, 3-tightening device, 301-tightening plate, 302-tension spring, 303-guide rail, 304-slide block, 305-air pressure support rod, 306-lug plate, 307-measuring hole, 4-base, 401-bottom plate, 402-clamping groove, 403-support rod, 5-sample block and 501-small top head.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
The embodiment of the utility model provides a concrete shrinkage measuring device, be in including sample box 2, the setting that is used for holding sample block 5 2 tip of sample box is used for carrying out measuring amesdial 1, is used for adjusting 2 inclination's of sample box base 4 and the tight device 3 in top to the length of sample block 5. The sample block 5 is contacted with the sample box 2 more tightly through the jacking device 3, so that the measurement error is reduced, and the accuracy of concrete shrinkage measurement is improved. Specifically, the method comprises the following steps:
as shown in fig. 6, in this embodiment, the test block 5 is a rectangular parallelepiped cement block of 100 mm × 515 mm, which is cast by concrete, and small jacks 501 which are cylindrical and protrude outward are embedded in the middle of both end surfaces of the test block 5, and the small jacks 501 are made of high-carbon steel, so that the influence of the flatness and surface roughness of the test block 5 on the measurement result can be reduced by the small jacks 501. As shown in fig. 1 and 2, the sample cell 2 has a sample groove for placing the sample block 5 therein, with reference to the shape and size of the sample block 5, the length of the sample groove is slightly longer than the length of the sample block 5, the sample groove is a V-shaped groove 201 having a V-shaped cross section, and an inner angle of the V-shaped groove 201 is a right angle, so that the sample block 5 can be automatically centered and positioned by the V-shaped groove surface after being placed in the V-shaped groove 201. The two end surfaces of the sample box 2 are an upper reference plate 202 and a lower reference plate 203 respectively, and the upper reference plate 202 and the lower reference plate 203 are parallel to each other and perpendicular to the groove surface of the V-shaped groove 201; the lower reference plate 203 is also made of high-carbon steel and is used for being matched with a small top head 501 on one side of the sample block 5 to abut against the sample block 5; the dial indicator 1 is a waterproof electronic dial indicator 1, the dial indicator 1 is vertically and fixedly mounted on the upper reference plate 202, and the telescopic measuring head 101 of the dial indicator 1 and the small ejector 501 of the sample block 5 are on the same axis.
Furthermore, the dial indicator 1 is also provided with a signal transmitting device, and data acquired by the dial indicator 1 can be transmitted to the data acquisition unit in real time through the signal transmitting device, so that the shrinkage of the sample block 5 can be remotely monitored and analyzed, the labor cost is saved, and the measurement error caused by transferring, putting again and fixing the sample block 5 is effectively avoided.
As shown in fig. 1 and fig. 2, in order to reduce the influence of the frictional resistance on the length change, as a preferred embodiment, a plurality of rollers 204 are further symmetrically arranged on the groove surface of the V-shaped groove 201, and the rollers 204 are arranged side by side along the length direction of the V-shaped groove 201 on one side close to the lower reference plate 203, so that a certain distance is reserved between the rollers 204 and the upper reference plate 202 for the subsequent sliding of the tightening device 3; the rollers 204 are cylindrical, a certain gap is formed between every two adjacent rollers 204, the rolling surfaces of the rollers 204 are slightly higher than the groove wall of the V-shaped groove 201, the rollers 204 can prevent the sample block 5 from directly contacting with the inner wall of the V-shaped groove 201, and the friction resistance between the sample block 5 and the V-shaped groove 201 is effectively reduced.
As shown in fig. 2, in the embodiment of the present invention, the base 4 can not only support the sample box 2, but also adjust the inclination angle of the sample box 2, specifically, the base 4 includes a bottom plate 401 and a supporting rod 403, one side of the bottom plate 401 is connected to the bottom edge of the lower reference plate 203 of the sample box 2 through a hinge, a plurality of slots 402 for adjusting the inclination angle of the sample box 2 are provided in the middle of the bottom plate 401, the slots 402 are located below the sample box 2 and are uniformly arranged along the length direction of the sample box 2, one end of the supporting rod 403 is hinged to the sample box 2, the other end of the supporting rod abuts against the slots 402, and the supporting rod 403 abuts against different slots 402 to adjust the pitch angle of the sample box 2.
As shown in fig. 1 and 2, the tightening device 3 includes a tightening plate 301 disposed in parallel between the upper reference plate 202 and the lower reference plate 203, and an elastic device for providing a tightening force to the tightening plate 301. The lower part of the tightening plate 301 is a V-shaped plate matched with the V-shaped groove surface of the V-shaped groove 201, so that the tightening plate 301 can slide between the upper reference plate 202 and the lower reference plate 203 within a certain range to tighten the sample block 5; the middle part of the tightening plate 301 is provided with a measuring hole 307 with a diameter larger than that of the telescopic measuring head 101 of the dial gauge 1, so that the small top head 501 of the sample block 5 can penetrate through the measuring hole 307 on the tightening plate 301 to be in contact with the telescopic measuring head 101 of the dial gauge 1, and the length of the sample block 5 is measured.
In this embodiment, the elastic device is a tension spring 302, the tension of the tension spring 302 is greater than the static friction between the sample block 5 and the sample box 2 when horizontally placed and is much smaller than the internal stress of the sample block 5 when expanding and contracting, one end of the tension spring 302 is arranged on the lower reference plate 203, and the other end is detachably connected with the tightening plate 301 through a hook, so that the sample block 5 can be in closer contact with the lower reference plate 203 of the sample box 2 under the action of tightening force, and the sample block 5 can be conveniently mounted and dismounted; in order to improve the smoothness of the movement between the upper reference plate 202 and the lower reference plate 203 of the tightening plate 301, the tightening device 3 further comprises a guide device cooperating with the tension spring 302, the guide device comprises a guide rail 303 and a slide block 304, the guide rail 303 is arranged between the upper reference plate 202 and the lower reference plate 203 and is parallel to the movement direction of the test block 5, the slide block 304 is fixedly mounted on the tightening plate 301 and is in sliding fit with the guide rail 303, the tightening plate 301 can be always parallel to the lower reference plate 203 while tightening the test block 5 through the guide device, the correctness of the swinging position of the test block 5 in the V-shaped groove 201 is ensured, and the measurement precision is further improved.
The second embodiment:
as shown in fig. 3 and fig. 4, the difference from the first embodiment is that in the first embodiment, the elastic devices are two air pressure support rods 305 symmetrically arranged on both sides of the telescopic probe 101 of the dial indicator 1, one end of each air pressure support rod 305 is fixed on the upper reference plate 202, the other end of each air pressure support rod 305 is connected to an ear plate 306 integrally arranged on the side of the tightening plate 301, and the air pressure support rods 305 are all parallel to the axis of the telescopic probe 101. Compare extension spring 302, this embodiment need not to set up guider, and it is more convenient to install, but also can provide more invariable tight power in top.
The utility model provides a concrete shrinkage measuring device's specific application method as follows:
as shown in fig. 5, firstly, the telescopic probe 101 and the tightening plate 301 of the dial gauge 1 are moved away, then the sample block 5 to be tested is placed in the V-shaped groove 201, the sample box 2 is supported by the support rod 403, so that the sample box 2 is inclined to the direction of the lower reference plate 203 by a certain angle, at this time, the small top 501 at one end of the sample block 5 abuts against the lower reference plate 203 under the action of self gravity, the small top 501 at the other end of the sample block 5 penetrates through the measurement hole 307 on the tightening plate 301 and contacts with the telescopic probe 101 of the dial gauge 1, and the tightening plate 301 tightens the sample block 5, so that a fine error caused by the fact that the side surface of the sample block 5 is not flat enough can be effectively eliminated, and the correctness of the swinging position of the sample block 5 in the V-shaped groove 201 is ensured; and then, the sample block 5 is cured in dry air, the volume of the sample block 5 generates micro shrinkage along with the gradual dehydration of the sample block in a curing environment, and at the moment, the sample block 5 can overcome the static friction between the sample block 5 and the sample box 2 under the matching action of the roller 204 and the jacking device 3 to slide, so that a tiny gap between the sample block 5 and the sample box 2 is eliminated in time, and the accuracy of a measuring result is improved.
Obviously, the utility model discloses can not only carry out real-time measurement to the relative shrinkage length of coupon 5 in the maintenance environment, also can be like current concrete shrinkage dilatometer, in non-maintenance environment, directly measure the length of coupon 5, its method of use is common general knowledge, and it is no longer repeated here.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A concrete shrinkage measuring device, comprising:
the device comprises a sample box, a positioning device and a control device, wherein a sample groove for accommodating a sample block is formed in the sample box, and an upper reference plate and a lower reference plate which are vertical to the length direction of the sample groove are respectively arranged at two ends of the sample box;
the jacking device comprises a jacking plate arranged between the upper reference plate and the lower reference plate in a sliding manner and an elastic device used for providing jacking force to enable the sample block to be in closer contact with the lower reference plate of the sample box;
and the dial indicator is fixedly installed on the upper reference plate of the sample box and used for measuring the length of the sample block.
2. A concrete shrinkage measurement apparatus according to claim 1, wherein: the sample groove is a V-shaped groove with a V-shaped cross section.
3. A concrete shrinkage measurement apparatus according to claim 2, wherein: and a roller for reducing the friction force between the sample block and the V-shaped groove is also arranged in the V-shaped groove.
4. A concrete shrinkage measuring apparatus according to claim 1, wherein: the base comprises a bottom plate, a plurality of clamping grooves and a supporting rod, wherein the bottom plate is connected with the sample box in a rotating mode, the clamping grooves are formed in the bottom plate and used for adjusting the inclination angle of the sample box, one end of the clamping groove is connected with the sample box in a rotating mode, and the other end of the clamping groove abuts against the supporting rod.
5. A concrete shrinkage measurement apparatus according to claim 1, wherein: the dial indicator is an electronic dial indicator, and a signal transmitting device used for remotely transmitting acquired data to the data acquisition unit is further arranged on the dial indicator.
6. A concrete shrinkage measuring apparatus according to claim 1, wherein: the elastic device is a tension spring, one end of the tension spring is arranged on the lower reference plate, and the other end of the tension spring is detachably connected with the jacking plate.
7. A concrete shrinkage measuring apparatus according to claim 6, wherein: the tightening device also comprises a guide rail which is arranged between the upper reference plate and the lower reference plate and is parallel to the movement direction of the sample block, and a slide block which is fixed on the tightening plate and is matched with the guide rail.
8. A concrete shrinkage measuring apparatus according to claim 1, wherein: the elastic device is an air pressure support rod, one end of the air pressure support rod is fixed on the upper reference plate, and the other end of the air pressure support rod is connected with the tightening plate.
9. A concrete shrinkage measuring apparatus according to any one of claims 1 to 8, wherein: the middle parts of two end faces of the sample block are also vertically provided with small jacks protruding outwards, and the small jacks and the lower reference plate are both made of hard materials.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221778853.4U CN218470731U (en) | 2022-07-11 | 2022-07-11 | Concrete shrinkage factor measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221778853.4U CN218470731U (en) | 2022-07-11 | 2022-07-11 | Concrete shrinkage factor measuring device |
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| Publication Number | Publication Date |
|---|---|
| CN218470731U true CN218470731U (en) | 2023-02-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221778853.4U Active CN218470731U (en) | 2022-07-11 | 2022-07-11 | Concrete shrinkage factor measuring device |
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| CN (1) | CN218470731U (en) |
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- 2022-07-11 CN CN202221778853.4U patent/CN218470731U/en active Active
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