CN210834910U

CN210834910U - Concrete shrinkage measuring instrument

Info

Publication number: CN210834910U
Application number: CN201921156587.XU
Authority: CN
Inventors: 周锡玲
Original assignee: Hunan Agricultural University
Current assignee: Hunan Agricultural University
Priority date: 2019-07-23
Filing date: 2019-07-23
Publication date: 2020-06-23
Anticipated expiration: 2029-07-23

Abstract

The utility model relates to a concrete shrinkage factor measuring apparatu, including base, pole setting, support and measuring meter, be equipped with upper and lower cap on measuring meter and the base respectively, still be equipped with gliding location pointer from top to bottom in the pole setting, the location pointer transversely extends to the position department between the upper and lower cap, and can rotate around the pole setting in the horizontal plane. When the test piece is measured, the positioning pointer is attached to the surface of the test piece and the deflection angle of the positioning pointer is marked, so that the test piece is placed at the same position when the test piece is measured at each time, the deviation of the measurement result caused by the change of the measurement position of the test piece is avoided, and the accuracy of the measurement result is improved.

Description

Concrete shrinkage measuring instrument

Technical Field

The utility model relates to a concrete length measuring instrument, more specifically say, relate to concrete shrinkage factor measuring apparatu. It can also be used for measuring the length of cement-based material.

Background

Concrete materials are widely used in the construction field, and the volume deformation of the concrete materials has important influence on the durability of the concrete materials. The shrinkage of concrete length is of great concern because of the ease of obtaining linear volume change data. In the prior art, when the length change of the concrete is measured, a concrete shrinkage measuring instrument is used. As shown in fig. 1, the apparatus generally comprises a base 1 'provided with a vertical rod 2' and a bracket 3 ', wherein a length change measuring gauge 4' of a dial gauge or a ten-thousandth gauge is arranged on the bracket, the measuring gauge is provided with a mandril 4a 'extending downwards, and an upper column cap 51' is fixed on the mandril and used for positioning the upper end of a test piece; the base is fixedly provided with a lower column cap 52' for positioning the lower end of the test piece. When the long-term length change of the concrete material is tested, the measuring meter is usually reset by using the standard rod, and then the test piece to be tested is positioned between the upper column cap and the lower column cap and is used for measuring the length change of the test piece, so that the concrete shrinkage rate is determined.

When a concrete length measurement test piece is manufactured, a copper head with one end in a spherical crown shape and the other end embedded in the concrete test piece is embedded in a semicircular hole on a test piece mold, and concrete is poured in the mold. When the mould is disassembled, the copper head needs to be separated from the mould and is left in concrete, so that the semicircular hole on the mould is usually slightly larger than the copper head, the copper head is stripped from the mould, but the copper head is difficult to ensure to be perpendicular to the end surface of a test piece, the upper hemispherical surface of the copper head is inclined, the copper head cannot be completely matched with the spherical groove of the column cap, the contact position between the end part of the test piece and the column cap is different when the test is carried out at each time, the test piece can generate slight angle inclination to cause the measurement result to generate more than dozens of microstrain errors, the errors often have no regularity, the copper head cannot be removed in experimental analysis, and the measurement result is inaccurate.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model lies in, to the ubiquitous copper head because of the test piece tip among the prior art bury put not just, the great problem of test piece length test value fluctuation when leading to measuring provides a concrete shrinkage factor measuring apparatu that can accurate location test piece measuring position.

The utility model provides a technical scheme that its technical problem adopted is: a concrete shrinkage measuring instrument is constructed and comprises a base, a vertical rod, a support and a measuring meter, wherein an upper column cap and a lower column cap are respectively arranged on the measuring meter and the base, a positioning pointer capable of sliding up and down is further arranged on the vertical rod, the positioning pointer transversely extends to the position between the upper column cap and the lower column cap, and can rotate around the vertical rod in the horizontal plane.

Concrete shrinkage factor measuring apparatu in, still include pole setting slide mechanism, pole setting slide mechanism includes that the slip cap establishes at the peripheral sliding sleeve of pole setting, fixes the sliding sleeve outside just is located the calibrated scale of location pointer below, be equipped with the angle scale on the calibrated scale.

Concrete shrinkage factor measuring apparatu in, the sliding sleeve periphery is equipped with the opening along the rotation axis direction, sliding sleeve's opening part is equipped with the adjustment and presss from both sides.

Concrete shrinkage factor measuring apparatu in, the spout has been seted up along vertical direction in the pole setting middle part, the sliding sleeve periphery is equipped with the opening along the rotation axis direction, the sliding sleeve middle part is equipped with and passes the adjustment of spout presss from both sides.

Concrete shrinkage factor measuring apparatu in, the through-hole has been seted up at the sliding sleeve middle part, the adjustment is pressed from both sides including passing the connecting rod of through-hole and pole setting spout the threaded connection at connecting rod both ends is in the lock nut at connecting rod both ends.

Concrete shrinkage factor measuring apparatu in, the pole setting surface is close to spout department is equipped with the length scale along the vertical direction of spout.

Concrete shrinkage factor measuring apparatu in, the sliding sleeve lateral wall is equipped with the circumference spout, location pointer one end is equipped with rotatory ring, rotatory ring with the circumference spout is mutually supported.

In the concrete shrinkage measuring instrument of the present invention, the surface of the rotating ring is provided with a wrench position.

Implement the utility model discloses a concrete shrinkage factor measuring apparatu has following beneficial effect: the concrete shrinkage measuring instrument comprises a base, an upright rod, a support and a measuring meter, wherein an upper column cap and a lower column cap are respectively arranged on the measuring meter and the base, a positioning pointer capable of sliding up and down is arranged on the upright rod, the positioning pointer transversely extends to a position between the upper column cap and the lower column cap, and can rotate around the upright rod in a horizontal plane. When a test piece is measured, the positioning pointer slides up and down along the vertical rod to select two different positions in the vertical direction, the positioning pointer rotates at each position to lean against the surface of the test piece and mark the deflection angle of the pointer; when the secondary measurement is carried out, the deflection angle of the positioning pointer at the same vertical position is ensured to be consistent with that of the former measurement, so that the test piece is ensured to be at the same position when the test piece is measured at each time, the larger strain fluctuation caused by the tiny rotation of the test piece is avoided, and the accuracy of the measurement result is improved.

The present invention will be further explained with reference to the drawings and examples.

Drawings

FIG. 1 is a schematic structural diagram of a prior art concrete shrinkage tester;

fig. 2 is a schematic structural diagram of a preferred embodiment of the concrete shrinkage ratio measuring instrument according to the present invention;

fig. 3 is a perspective view of a preferred embodiment of the concrete shrinkage ratio measuring instrument according to the present invention;

FIG. 4 is an enlarged view of section I of FIG. 3;

fig. 5 is a schematic diagram illustrating a partial explosion of a preferred embodiment of the concrete shrinkage ratio measuring apparatus according to the present invention;

fig. 6 is a schematic structural diagram of another embodiment of the concrete shrinkage ratio measuring instrument according to the present invention;

fig. 7 is an enlarged view of a portion II of fig. 6.

Detailed Description

As shown in fig. 1, 2, 3, 4, and 5, in the preferred embodiment of the concrete shrinkage measuring instrument of the present invention, the concrete shrinkage measuring instrument includes a base 1, a vertical rod 2, a bracket 3, and a measuring meter 4, wherein an upper column cap 51 and a lower column cap 52 are respectively disposed on the measuring meter 4 and the base 1, a positioning pointer 10 capable of sliding up and down is further disposed on the vertical rod 2, and the positioning pointer 10 transversely extends to a position between the upper column cap 51 and the lower column cap 52, and can rotate around the vertical rod 2 in a horizontal plane. When the test piece 20 is positioned between the upper and

lower caps

51, 52, the positioning pointer 10 can rotate around the vertical rod 2 and abut against the surface of the test piece 20.

Specifically, in the preferred embodiment of concrete shrinkage factor measuring apparatu, still include the slip cap and establish at the peripheral sliding sleeve 11 of pole setting 2, fix the sliding sleeve 11 outside just is located graduated disk 12 of location pointer 10 below, be equipped with angle scale 12a on the graduated disk 12. Thus, when the rotational positioning pointer 10 is brought close to the surface of the test piece 20, the angle scale 12a on the dial 12 is directly read. In the secondary measurement, the pointer 10 is close to the surface of the test piece 20, and the test piece is rotated to enable the angle of the pointer to be the same as the initial angle, so that the test piece can be always in the same position in each measurement, and the accuracy of the test result of the test piece is improved. .

In the preferred embodiment, a sliding slot 13 is preferably formed in the middle of the vertical rod 2 along the vertical direction, an opening 11a is formed in the circumferential surface of the sliding sleeve 11 along the rotating shaft direction, and an adjusting clamp 14 penetrating through the sliding slot 13 is preferably formed in the middle of the sliding sleeve 11. The sliding sleeve 11 can be positioned at the designated position of the upright rod 2 by adjusting the fit clearance between the sliding sleeve 11 and the upright rod 2 through the adjusting clamp. Specifically, a through hole 11b is formed in the middle of the sliding sleeve 11, and the adjusting clamp includes a connecting rod 15 penetrating through the through hole and the vertical rod sliding groove 13 and lock nuts 16 connected to two ends of the connecting rod by threads. By turning the locking nut, the inner diameter of the sliding sleeve 11 can be enlarged or reduced, so that the fit between the sliding sleeve 11 and the upright 2 is changed into a clearance fit or transition fit, in order to fix the sliding sleeve 11 on the upright 2 or to detach it from the upright 2. Meanwhile, because the connecting rod is limited in the sliding groove 13, the sliding sleeve 11 cannot rotate around the vertical rod 2 and can only slide up and down along the vertical rod 2, so that the dial 12 fixed on the sliding sleeve 11 cannot rotate in the horizontal plane, and the accuracy of the deflection angle reading of the positioning pointer 10 is ensured.

In the preferred embodiment, a length scale 13a is preferably provided on the surface of the upright 2 near the chute 13 along the vertical direction of the chute. When the test piece 20 is measured, the length scale 13a can be directly read without recording the position of the positioning pointer 10 in the vertical direction by marking on the device, and the use is more convenient. When the surface of the test piece is not smooth enough or a hole is formed locally, the adjusting clamp controls the vertical positions of the sliding sleeve and the positioning pointer on the vertical rod to avoid the position of the surface defect of the test piece.

In the above embodiment, it is preferable that a circumferential sliding groove 11c is provided on the outer side wall of the sliding sleeve 11, a rotating ring 10a is provided at one end of the positioning pointer 10 close to the vertical rod 2, and the rotating ring 10a and the circumferential sliding groove 11c are engaged with each other so that the rotating ring 10a can rotate around the vertical rod 2 in the circumferential sliding groove 11c, thereby enabling the positioning pointer 10 to rotate around the vertical rod 2.

As shown in fig. 6 and 7, in another embodiment of the concrete shrinkage measuring instrument according to the present invention, the difference from the above preferred embodiment is the connection manner between the sliding sleeve 11 and the vertical rod 2. In the present embodiment, in order to position the sliding sleeve 11 at a predetermined position of the vertical rod 2, an opening 11a may be provided in the circumferential surface of the sliding sleeve 11 along the rotation axis direction, and an adjustment clip 14 may be provided at the opening of the sliding sleeve 11. Therefore, the fit clearance between the sliding sleeve 11 and the vertical rod 2 is conveniently adjusted by adjusting the clearance at the opening 11a of the sliding sleeve through the adjusting clamp 14, clearance fit or transition fit is formed, and the sliding sleeve 11 is conveniently positioned at the specified position of the vertical rod 2. The vertical rod is not provided with a sliding groove, and a length scale 13a can be arranged on the surface of the vertical rod 2 close to the sliding groove 13 along the vertical direction of the sliding groove.

As shown in fig. 4, 5, 6 and 7, in the above embodiment, it is preferable to provide a wrench position 10b on the surface of the rotating ring 10a, so that when the rotating ring 10a is turned, the positioning pointer 10 can be quickly abutted on the surface of the test piece 20. Specifically, the key position 10b may be a protrusion protruding outward from the surface of the rotating ring 10 a.

When a test piece 20 is measured, the positioning pointer 10 slides up and down along the vertical rod 2 to take two different positions in the vertical direction, the positioning pointer 10 rotates at each position to lean against the surface of the test piece 20, and the deflection angle of the pointer is marked; when the secondary measurement is carried out, the deflection angle of the positioning pointer 10 at the same vertical position is ensured to be consistent with that of the former measurement, so that the inclination angle of the test piece 20 in each measurement is ensured to be consistent, strain deviation caused by the fact that the test piece is placed at different positions is avoided, and the accuracy of the measurement result is improved.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention.

Claims

1. A concrete shrinkage measuring instrument comprises a base, a vertical rod, a support and a measuring meter, wherein an upper column cap and a lower column cap are respectively arranged on the measuring meter and the base.

2. The concrete shrinkage measuring instrument of claim 1, further comprising a sliding sleeve slidably disposed around the vertical rod, and a dial fixed outside the sliding sleeve and located below the positioning pointer, wherein the dial is provided with angle scales.

3. The concrete shrinkage measuring instrument according to claim 2, wherein an opening is formed in the circumferential surface of the sliding sleeve in the direction of the rotating shaft, and an adjusting clamp is arranged at the opening of the sliding sleeve.

4. The concrete shrinkage measuring instrument of claim 2, wherein a sliding groove is formed in the middle of the vertical rod in the vertical direction, an opening is formed in the circumferential surface of the sliding sleeve in the direction of the rotating shaft, and an adjusting clamp penetrating through the sliding groove is formed in the middle of the sliding sleeve.

5. The concrete shrinkage measuring instrument of claim 4, wherein a through hole is formed in the middle of the sliding sleeve, and the adjusting clamp comprises a connecting rod penetrating through the through hole and the vertical rod sliding groove and locking nuts in threaded connection with two ends of the connecting rod.

6. The concrete shrinkage measuring instrument according to claim 4, wherein the surface of the vertical rod near the sliding groove is provided with length scales along the vertical direction of the sliding groove.

7. The concrete shrinkage rate measuring instrument according to any one of claims 2 to 6, wherein the outer side wall of the sliding sleeve is provided with a circumferential sliding groove, and one end of the positioning pointer is provided with a rotating ring which is matched with the circumferential sliding groove.

8. The concrete shrinkage measuring instrument of claim 7, wherein the surface of the rotating ring is provided with a wrench position.