CN210570585U - Calibration piece and calibration device of reinforcing bar protective layer tester - Google Patents
Calibration piece and calibration device of reinforcing bar protective layer tester Download PDFInfo
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- CN210570585U CN210570585U CN201922002735.9U CN201922002735U CN210570585U CN 210570585 U CN210570585 U CN 210570585U CN 201922002735 U CN201922002735 U CN 201922002735U CN 210570585 U CN210570585 U CN 210570585U
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Abstract
The utility model relates to a detecting instrument calibration field discloses a calibration piece of protective steel bar layer apparatus, including calibration test piece and a plurality of standard reinforcing bar. Calibration test piece is the cuboid shape, and calibration test piece is equipped with first through-hole, and standard reinforcement detachable sets up on first through-hole. The shortest distances between the first through hole and the upper surface, the lower surface, the left side surface and the right side surface of the calibration test piece are the thicknesses of four steel bar protection layers required by the standard. The diameter of the standard steel bar is 8mm-50mm, and the calibration test piece is made of a non-magnetic material. The utility model also discloses a calibrating device of the protective steel bar layer apparatus of the calibration piece that contains above-mentioned protective steel bar layer apparatus. The utility model discloses can simulate the site work condition of building site, can the use of monoblock formula, combination formula, facilitate the use, carry and deposit, application scope is wide moreover, only needs a calibration test piece can accomplish the calibration target, is suitable for popularization and application.
Description
Technical Field
The utility model belongs to the technical field of detecting instrument calibration and specifically relates to a calibration piece and calibrating device of protective steel bar layer apparatus.
Background
At present, the main detection basis of instruments for detecting the thickness of the steel bar protective layer and the distance between steel bars is JJF 1224-2009 (Standard for measuring and calibrating the thickness of the steel bar protective layer and the thickness of a floor slab) and JGJ/T152-2019 (Standard for detecting the steel bars in concrete).
(1) JJF 1224-2009 Standard for measuring and calibrating thickness of protective layer of reinforcing steel bar and floor slab
TABLE 1 Rebar cover thickness measuring instrument measurement characteristic requirements
Technical requirements of annex B Standard Block
B.1 Standard Block Material
B.1.1, the coating material is selected from nonmagnetic material.
TABLE B.1 technical requirements
(2) According to the related requirements in appendix A, B of JGJ/T152-2019 technical Standard for detecting reinforcements in concrete, the following steps are carried out:
method for calibrating reinforcing steel bar detector by appendix A electromagnetic induction method
A.1 preparation of calibration specimens
A.1.1 the material for making the calibration test piece must not generate electromagnetic interference to the instrument, and concrete, wood, plastic, epoxy resin and the like can be adopted. Preferably, the concrete material is adopted, and the concrete is used after the age of the concrete reaches 28 days.
When A.1.2 preparation calibration test piece, should be with the reinforcing bar pre-buried in calibration test piece, both ends should expose the test piece when the reinforcing bar is buried, and length should be greater than 50 mm. The surface of the test piece is smooth, the axes of the steel bars are parallel to the surface of the test piece, the embedding depths of the steel bars measured from 4 side surfaces of the test piece are different, and the difference of the vertical distances from the axes of the two exposed ends of the same steel bar to the same surface of the test piece is not more than 0.5 mm.
A.1.3 the size of the calibration test piece, the nominal diameter of the steel bar and the thickness of the concrete protective layer can be set according to the range of the steel bar detector by the electromagnetic induction method and the design parameters of the steel bar to be detected in the engineering. The preparation of the reinforcing steel bar spacing calibration test piece can be carried out according to item B.1.2 of the appendix B of the standard.
Annex B radar instrument calibration method
B.1 preparation of calibration test piece
B.1.1, selecting local common raw materials and strength grades to manufacture a concrete slab, and simultaneously manufacturing a plain concrete test block for correcting the concrete dielectric constant by adopting the same-tray concrete mixture, wherein the size of the plain concrete test block conforms to the specification of the radar instrument. When the number of test pieces is large, the calibration concrete plates correspond to the test pieces for correcting the dielectric constant one by one.
B.1.2 the concrete slab should adopt the single-storeyed reinforcing mat, should preferably adopt the diameter 8 mm-12 mm round steel to make, its interval should preferably be 100 mm-150 mm, the concrete protective layer should cover four sections of 15mm, 40mm, 65mm, 90mm, the reinforcing mat of each concrete protective layer should have 8 intervals at least. The thickness difference of the protective layers at two ends of the steel bar, which are exposed out of the two ends, is not greater than 0.5mm, and the distance difference between the two ends is not greater than lmm. And manufacturing a corresponding test piece according to the actual engineering.
B.L.3 the raw materials for manufacturing the concrete test piece do not contain ferromagnetic raw materials, the concrete test piece is watered and covered for maintenance within 7 days after pouring, natural maintenance is adopted after 7 days, the age of the concrete test piece reaches 28 days, and the service life of the concrete test piece is prolonged after natural wind.
The reinforcing bar that needs to detect in the actual engineering application generally is vertical atress reinforcing bar, and the diameter is ribbed reinforcing bar 8 ~ 32 mm.
The present analyzer calibration devices used on the market are mainly made of nonmagnetic materials into standard blocks. And scanning and detecting the steel bar on the upper detection surface by a steel bar protection layer detector, and comparing the steel bar with the measured value of the caliper. And measuring the actual deviation condition of the rib protective layer scanner so as to achieve the aim of calibration.
The forming mode has two kinds, and one kind is detachable reinforcing bar protective layer test block. For the detachable reinforcing steel bar protection layer test block, when the thickness of the protection layer is calibrated, a large number of test blocks with different heights need to be prepared for measurement, and different cushion block heights need to be selected for different calibration points. The measurement process of repeatedly changing the cushion block is not only complicated in measurement, but also wastes a large amount of test block resources. Most importantly, when the calibration test piece is manufactured, the steel bar is not in line with the standard file, the steel bar is embedded in the calibration test piece, the test piece is exposed at two ends when the steel bar is embedded, and the length is preferably more than 50 mm. The reinforcing mesh should have at least 8 intervals in the thickness of each concrete protective layer. So that the measurement results deviate.
The other is a standard test block with an integral protective layer. The integral standard test block is mainly cast by concrete and steel bars. For the integral standard block of the reinforcing steel bar protective layer, the required test block is large due to more calibration points, and the manufacture and the use are inconvenient. In addition, the integral standard test block steel bar cannot be well protected, and the steel bar is extremely easy to corrode and oxidize, so that the calibration result is inaccurate.
Disclosure of Invention
The utility model aims to solve the problem that the existing calibrating device is complicated and fussy to use due to the various test blocks, and the volume is large, so that the manufacturing and the use are inconvenient. The utility model provides a calibration piece and calibrating device of protective steel bar layer apparatus not only accords with relevant standard file requirement, can simulate the site work condition in building site moreover, but the use of monoblock formula, combination formula facilitates the use, carries and deposits, and application scope is wide moreover, only needs a calibration test piece can accomplish the calibration task, for realizing above-mentioned purpose, the utility model discloses a following technical scheme:
the utility model discloses a calibration piece of a reinforcing steel bar protective layer tester, which comprises a calibration test piece and a standard reinforcing steel bar; the calibration test piece is cuboid, first through holes with axes vertical to the front side and the rear side are formed in the front side and the rear side of the calibration test piece, and the standard steel bars are detachably arranged on the first through holes; the shortest distances between the first through hole and the upper surface, the lower surface, the left side surface and the right side surface of the calibration test piece are the thicknesses of the four steel bar protection layers required by the standard; the diameter of the standard steel bar is 8mm-50mm, and the calibration test piece is made of a non-magnetic material.
When the calibration apparatus detects the thickness of the steel bar protective layer, only the standard steel bar needs to pass through the first through hole of the calibration test piece, the two ends of the steel bar are exposed out of the calibration test piece, the length of the calibration test piece is more than 50mm, the readings of different depths of the protective layer of the steel bar are measured from four sides of the calibration test piece through the apparatus, and the readings are compared with the actual measuring value of the caliper. The actual deviation condition of the rib protection layer tester is measured, so that the aim of calibration is fulfilled.
Further, a second through hole is formed from the left side face to the right side face of the calibration test piece, and a stirrup penetrates through the second through hole.
Further, the diameter of the first through hole is 50 mm; the shortest distances between the first through hole and the upper surface, the lower surface, the left side surface and the right side surface of the calibration test piece are respectively 15mm, 90mm, 40mm and 65mm, and the shortest distances conform to four sections which are covered by the thickness of a concrete protective layer of a steel bar specified by a standard file.
Furthermore, a plurality of first grooves are formed in the end face of the inner wall of the first through hole.
Furthermore, the cushion block is matched with the first through hole; one end of the cushion block is provided with a bulge matched with the first groove, and the other end of the cushion block is provided with a semi-arc groove matched with reinforcing steel bars with different diameters; the cushion block is made of a non-magnetic material. The cushion block is placed in the first through hole, the protrusion and the first groove are installed in a matched mode, the standard steel bar is placed in the semi-circular-arc groove, the outer wall of the steel bar is attached to the inner wall of the first through hole, and measurement is convenient and accurate. The radian of the semi-arc groove is changed, so that the steel bar clamp can adapt to standard steel bars with different diameters.
In one embodiment, the calibration test piece is made of foam concrete, light concrete, organic glass and engineering plastics; the calibration test piece is integrated into one piece, and processing is convenient and firm. The material is closer to the engineering site material, and the weight is lighter. The method meets the requirements of a steel bar detector calibration method in appendix A and an appendix B radar instrument calibration method in appendix B of technical Standard for detecting steel bars in concrete JGJ/T152-2019.
In another embodiment, the calibration test piece is made of organic glass or engineering plastics; the calibration test piece is composed of an organic glass plate or an engineering plastic plate in a detachable installation mode, and is convenient to carry and store.
In another embodiment, the device further comprises a support frame; the support frame is arranged below the calibration test piece. The detection surface of the bottom is convenient to measure. The support frame is formed by four plates in an overlapping mode, and a support plate is further arranged in the middle of the support frame, so that stable support is facilitated.
The utility model also discloses a calibration device of the reinforcing steel bar protective layer tester, which comprises a plurality of calibration pieces of the reinforcing steel bar protective layer tester; the calibration piece of the reinforcing steel bar protective layer tester is the calibration piece of the reinforcing steel bar protective layer tester. A plurality of calibration test pieces are arranged in a line, and each calibration test piece is orderly arranged according to the orientations of the upper surface, the lower surface, the left side surface and the right side surface of the calibration test piece. The distance between the centers of the first through holes of the adjacent calibration test pieces is 100mm-160 mm.
Further, the device also comprises a position marking mechanism; the position marking mechanism is arranged on the upper surfaces of the calibration test piece assemblies; the position marking mechanism comprises a sliding rod and a plurality of pointers, wherein the sliding rod is provided with a sliding chute in the middle; the pointer is slidably disposed in the chute. When the calibration measuring instrument detects the distance between the steel bars, the pointer is displaced to the position point after the measuring instrument measures the position point of the steel bars, so that the rear caliper can measure the real size conveniently. Instead of using a marking method such as scribing which is a destructive calibration test piece.
When the calibration measuring instrument detects the distance between the steel bars, the calibration test pieces are combined and arranged in line. And respectively enabling the standard steel bars to pass through the first through holes, and exposing the calibration test pieces at two ends of the steel bars. Eight distances are selected from the detection surface of the calibration test piece combination through the measuring instrument for measurement, and the measured value is compared with the actual measured value of the caliper. The deviation between the measuring instrument and the actual condition is measured, so that the aim of calibration is fulfilled. The direction of the calibration test piece is turned over, the stirrups penetrate through the second through holes of the calibration test piece to be connected, two calibration test piece combinations can be obtained, and the thicknesses of the protective layers of four numerical values can be obtained through measurement of the upper detection surface and the lower detection surface.
The utility model discloses an useful part is:
1. the utility model discloses can constitute by monolithic calibration test piece or its combination formula, it is portable nimble changeable to assemble. The combined calibration test piece can be stacked during storage, and does not occupy space.
2. Set up first through-hole at calibration test piece for the standard reinforcement can be dismantled with calibration test piece and be connected, separately deposits, and it is convenient to use. The shortest distance between the first through hole and the upper surface, the lower surface, the left side surface and the right side surface of the calibration test piece is the thickness of the steel bar protection layer, the thicknesses and the differences of the relevant standard requirements are different, the detection surfaces with four different thicknesses of the protection layer can be obtained by turning over the calibration test piece, and the detection requirements can be met only by the calibration test piece with one specification.
3. The diameter of first through-hole is 50mm, can place the reinforcing bar that the diameter is 6mm ~50mm, the shortest distance that the reinforcing bar protective layer thickness is respectively 15mm, 90mm, 40mm, 65mm of the upper surface, lower surface, left surface and the right flank of first through-hole and calibration test piece. The method meets the requirements of four sections to be covered by the thickness of the concrete protective layer of the steel bar and the diameter of the tested steel bar specified by a standard file.
4. Set up the second through-hole on the calibration test piece to pass with the stirrup, be in the same place polylith calibration test piece fixed connection, prevent to remove between the calibration test piece and lead to measuring inaccurate.
5. And a calibration test piece support frame is arranged, so that the bottom detection surface can be conveniently measured.
6. The position marking mechanism is arranged above the calibration test piece, when the calibration measuring instrument detects the distance between the steel bars, the marking mode of using a marking line and other damaged calibration test pieces is replaced after the measuring instrument measures the position points of the steel bars, the pointer is displaced from the position points, and the distance between the positions measured by the later caliper measuring detector is convenient.
7. When the material of calibration test piece was organic glass or engineering plastics, make the demountable installation form with the calibration test piece, portable deposits.
8. The cushion blocks matched with different steel bar diameters are installed on the first through holes, so that the outer walls of the steel bars are attached to the inner walls of the first through holes, and measurement is convenient and accurate. The calibration test piece can be matched with steel bars with various diameters for measurement, and the universality rate is high.
Drawings
Fig. 1 is a schematic perspective view of a calibration specimen.
Fig. 2 is a front view of the calibration test piece.
FIG. 3 is a schematic diagram of the structure of the pad under different radians of the arc groove.
FIG. 4 is a structural view of a calibration steel bar protective layer thickness measuring apparatus according to an embodiment.
FIG. 5 is a structural view of the gauge for calibrating the thickness of the steel bar protective layer according to the embodiment.
FIG. 6 is a schematic perspective view of a three-part detachable calibration specimen according to an embodiment.
Fig. 7 is a structural view of a state of use of the four-calibration bar pitch measuring instrument according to the embodiment.
FIG. 8 is a top view of the four calibrated steel bar pitch measuring apparatus according to the embodiment in use.
Description of the main component symbols:
1-calibration test piece, 2-first through hole, 21-first groove, 3-second through hole, 5-steel bar, 6-stirrup, 7-position marking mechanism, 71-slide bar, 72-pointer, 8-support frame, 82-support plate, 9-steel bar detection host, 10-steel bar detection probe, 11-cushion block, 111-bulge, 112-semi-circular arc groove and 12-caliper.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the present invention is further described in detail with reference to the accompanying drawings and specific embodiments.
The first embodiment is as follows: calibrating the thickness tester of the steel bar protective layer, using the cushion block 11 to fix the standard steel bar 5
As shown in fig. 1 to 4, the utility model discloses a calibration piece of protective steel bar layer apparatus, including 1 a plurality of standard reinforcement 5 of calibration piece, calibration piece 1 is the cuboid shape, and the side is equipped with axis and the first through-hole 2 of front and back side vertically around calibration piece 1. The diameter of the first through hole 2 is 50mm, and the diameter of the standard steel bar 5 is 8mm-50 mm. The standard steel bar 5 is detachably arranged on the first through hole 2. The shortest distances H1, H2, H3 and H4 between the first through hole 2 and the upper surface, the lower surface, the left side surface and the right side surface of the calibration test piece 1 are respectively 15mm, 90mm, 40mm and 65mm, namely four sections which are covered by the thickness of the concrete protective layer of the steel bar meeting the standard file.
The diameter of the first through hole 2 is 50mm, and the diameter of the standard steel bar 5 required by engineering is 8mm to 50 mm. In order to make the first through hole 2 match with the steel bars with various types and diameters better. A plurality of first grooves 21 are formed in the end face of the inner wall of the first through hole 2, and a cushion block 11 is installed in the first through hole 2. One end of the cushion block 11 is provided with a protrusion 111 matched with the first groove 21, the other end of the cushion block is provided with a semi-arc groove 112 matched with standard steel bars 5 with different diameters, and the cushion block 11 is made of non-magnetic materials. During the use, will select to place in first through-hole 2 with the cushion 11 of standard reinforcing bar 5 cooperation radian, protruding 111 and first recess 21 cooperate the installation, and standard reinforcing bar 5 is placed in semicircle recess 112 for the outer wall of standard reinforcing bar 5 pastes in the inner wall of first through-hole 2, and the measurement of being convenient for is accurate. By changing the radian of the semi-arc groove 112, the standard reinforcing steel bars 5 with different diameters can be adapted.
In order to adapt to the electromagnetic induction detection instrument, the calibration test piece 1 is made of a non-magnetic material. In the embodiment, the calibration test piece 1 is made of foam concrete or lightweight concrete, so that the calibration test piece is light in weight, low in material cost and capable of meeting the requirements of relevant standards. The integrated forming is realized, and the processing is convenient and firm. Not only can check electromagnetic induction detecting instrument but also can check radar apparatus.
The use process comprises the following steps:
when the calibration apparatus detects the thickness of the steel bar protection layer, only the standard steel bar 5 needs to pass through the first through hole 2 of the calibration test piece 1, the length of the calibration test piece 1 exposed at the two ends of the standard steel bar 5 is more than 50mm, and then the cushion blocks 11 matched with the standard steel bar 5 are selected to be installed at the two ends of the first through hole 2, so that the standard steel bar 5 is attached to the inner wall of the first through hole 2. The steel bar detection probe 10 is placed on a detection surface corresponding to the joint of the standard steel bar 5 and the inner wall of the first through hole 2, moves left and right, and reads out the minimum index through the steel bar detection host 9, namely the measurement thickness value of the steel bar protection layer measured by the measuring instrument from the detection surface. The actual thickness value of the steel bar protection layer corresponding to the detection surface is measured through the caliper 12, and the actual deviation condition of the steel bar protection layer determinator is obtained through comparison between the measured thickness value and the actual thickness value, so that the purpose of calibration is achieved. The different laminating positions of standard reinforcing steel bar 5 and the inner wall of first through-hole 2 are changed through changing the direction that the cushion 11 was placed to change the detection face. The tester can change the standard steel bars 5 and the cushion blocks 11 with different apertures, select the thickness of other three different steel bar protective layers for detection, compare the measured value with the actual value, and verify the value.
The utility model discloses a reinforcing bar protective layer detects and has simulated the site work condition of building site, detects from four faces. Set up cushion 11 on first through-hole 2, can adapt to the standard reinforcing bar 5 of various diameters, increase the flexibility ratio of using. The material selection adopts foam concrete or light concrete to meet the requirements of relevant standards. The material is lighter, and material cost ratio is lower, not only can check electromagnetic induction detecting instrument but also check radar appearance. The utility model is suitable for a calibration of protective steel bar layer apparatus accords with JJF 1224-2009 "protective steel bar layer, floor thickness measurement calibration standard", and JGJ/T152-2019 "steel bar in the concrete detects technical standard" annex A electromagnetic induction method protective steel bar layer's calibration method, annex B radar appearance calibration method requirement.
Example two: and (5) calibrating the reinforcing steel bar protective layer thickness tester, namely detecting the bottom detection surface by using the support frame 8.
As shown in fig. 5, the present embodiment is different from the first embodiment in that a support frame 8 is provided instead of the cushion block 11. Other structural features are consistent with the embodiments.
The left side surface and the right side surface of the calibration test piece 1 are provided with a plurality of second through holes 3 used for connecting the calibration test piece 1. The second through hole 3 is provided with a stirrup 6. The support frame 8 is arranged below the calibration test piece 1 and used for measuring the detection surface of the bottom.
The support frame 8 is formed by overlapping four plates, and the support plate 82 is arranged in the middle of the support frame 8, so that the support is stable.
During the use, take calibration test piece 1 on support frame 8. When the standard steel bar 5 is placed on the first through hole 2 according to the specification, the standard steel bar 5 is attached to the bottom of the first through hole 2 due to gravity. During the measurement, go to the detection plane that detects the bottom with reinforcing bar test probe 10 and can obtain the measurement thickness value of steel bar protective layer, through upset calibration test piece 1, can obtain the detection plane of 15mm, 90mm, 40mm, 65mm thickness. And then compared to the actual thickness value measured by the caliper 12. The actual deviation condition of the rib protection layer tester is measured, so that the aim of calibration is fulfilled.
Example three: the calibration test piece 1 is detachably mounted.
As shown in fig. 6, in this embodiment, the calibration test piece 1 is made of organic glass or engineering plastic, and can be used for verifying the electromagnetic induction detection instrument. Calibration test piece 1 comprises organic glass board or engineering plastic slab demountable installation, and portable deposits. Other structural features are consistent with either embodiment one or embodiment two.
Example four: and calibrating the steel bar spacing determinator for combined use.
Referring to fig. 7 and 8, the calibration device for the steel bar protection layer tester comprises nine calibration pieces of the steel bar protection layer tester. The calibration piece of the steel bar protection layer measuring instrument is the calibration piece of the steel bar protection layer measuring instrument in the first embodiment or the third embodiment.
During the use, neatly arrange nine calibration test pieces 1 into a line, every calibration test piece 1 is neatly arranged according to the position of its upper surface, lower surface, left surface and right flank, and the distance between the first through-hole 2 center of adjacent calibration test piece 1 is 155mm promptly the reinforcing bar interval.
In order to make the combination of the nine calibration test pieces 1 more stable and reliable, a plurality of second through holes 3 for connecting the calibration test pieces 1 are respectively arranged on the left side surface and the right side surface of the calibration test piece 1. Nine calibration test pieces 1 are connected in a row by passing stirrups 6 through the second through holes 3 to form 8 measurement intervals.
In the checking process, the position of the standard steel bar 5 needs to be marked after the measurement by the detector. In place of the marking method using a scribe line or the like which damages the calibration sample 1, a position marking mechanism 7 is provided on the detection surface of the assembly of the plurality of calibration samples 1. The position marking mechanism 7 includes a slide bar 71 having a slide groove in the middle and a plurality of pointers 72. The pointer 72 is slidably disposed within the chute. When the calibration measuring instrument detects the distance between the steel bars, after the measuring instrument measures the position point of the steel bars, the pointer 72 is displaced to the position point, so that the later caliper 12 can conveniently measure the measurement distance value of the position detected by the measuring instrument.
The use process comprises the following steps:
when the calibration measuring instrument detects the distance between the steel bars, nine calibration test pieces 1 are combined and arranged in a line, and the stirrups 6 penetrate through the second through holes 3 to fixedly connect the nine calibration test pieces 1. Pass first through-hole 2 respectively with standard reinforcing bar 5, calibration test piece 1 is exposed at the reinforcing bar both ends. Eight distances are selected from the upper detection surface or the lower detection surface of the calibration sample 1 assembly by the measuring instrument for measurement, and the measured values are compared with the actual value of the caliper 12. The deviation between the measuring instrument and the actual condition is measured, so that the aim of calibration is fulfilled. The specific operation is as follows: the steel bar detection probe 10 is placed on the detection surface to move until the thickness indication value of the protective layer of the steel bar detector is minimum, at the moment, the central line of the probe is superposed with the axis of the steel bar, and the position of the steel bar is marked by a pointer 72 on the position marking mechanism 7 at the corresponding position. The distance between the positions of the reinforcing steel bars found on the detection surface is measured by a caliper 12 to be a reinforcing steel bar distance test value. And measuring the distance between the center lines of the standard steel bars 5 on the side surface by using a caliper 12 to obtain an actual value of the distance between the steel bars, recording the numerical value and calculating the indicating value error. The interval is 155mm, and the reinforcing bar of every concrete protective layer thickness has 8 intervals and reinforcing bar both ends to expose. Therefore, the method is suitable for calibrating the steel bar spacing measuring instrument, and meets the requirements of a method for calibrating the steel bar protective layer by an electromagnetic induction method in appendix A and a method for calibrating a radar instrument in appendix B of JJF 1224-2009 Steel bar protective layer and floor thickness measurement and calibration specifications in JGJ/T152-2019 Steel bar detection technology Standard in concrete.
The calibration piece of assembling the reinforcing bar protective layer tester through the combination forms reinforcing bar apart from tester calibration equipment, can pile up when depositing, does not account for the space.
To sum up, the utility model discloses not only accord with relevant standard file requirement, can simulate the on-the-spot operating mode of building site moreover, but the use of monoblock formula, combination formula facilitates the use, carries and deposits, and application scope is wide moreover, only needs a calibration test piece can accomplish the calibration target, is suitable for popularization and application.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the present invention.
Claims (10)
1. The utility model provides a calibration piece of protective steel bar layer apparatus which characterized in that: the device comprises a calibration test piece and a standard steel bar; the calibration test piece is cuboid, first through holes with axes vertical to the front side and the rear side are formed in the front side and the rear side of the calibration test piece, and the standard steel bars are detachably arranged on the first through holes; the shortest distances between the first through hole and the upper surface, the lower surface, the left side surface and the right side surface of the calibration test piece are the thicknesses of the four steel bar protection layers required by the standard; the diameter of the standard steel bar is 8mm-50mm, and the calibration test piece is made of a non-magnetic material.
2. The calibration member for a steel bar protective layer measuring instrument according to claim 1, wherein: and a second through hole is formed from the left side surface to the right side surface of the calibration test piece, and a stirrup penetrates through the second through hole.
3. The calibration member for a steel bar protective layer measuring instrument according to claim 1, wherein: the diameter of the first through hole is 50 mm; the shortest distance between the first through hole and the upper surface, the lower surface, the left side surface and the right side surface of the calibration test piece is 15mm, 90mm, 40mm and 65mm respectively.
4. The calibration member for a steel bar protective layer measuring instrument according to claim 1, wherein: the end face of the inner wall of the first through hole is provided with a plurality of first grooves.
5. The calibration member for a steel bar protective layer measuring instrument according to claim 4, wherein: the cushion block is matched with the first through hole; one end of the cushion block is provided with a bulge matched with the first groove, and the other end of the cushion block is provided with a semi-arc groove matched with reinforcing steel bars with different diameters; the cushion block is made of a non-magnetic material.
6. The calibration member for a steel bar protective layer measuring instrument according to claim 1, wherein: the calibration test piece is made of foam concrete, light concrete, organic glass and engineering plastics; the calibration test piece is integrally formed.
7. The calibration member for a steel bar protective layer measuring instrument according to claim 1, wherein: the calibration test piece is made of organic glass or engineering plastics; the calibration test piece is composed of an organic glass plate or an engineering plastic plate in a detachable installation mode.
8. The calibration member for a steel bar protective layer measuring instrument according to claim 1, wherein: the device also comprises a supporting frame; the support frame is arranged below the calibration test piece; the support frame is formed by four plates in an overlapping mode, and a support plate is further arranged in the middle of the support frame.
9. The utility model provides a calibrating device of protective steel bar layer apparatus which characterized in that: the calibration piece comprises a plurality of reinforcing steel bar protection layer measuring instruments; the calibration piece of the steel bar protection layer tester is the calibration piece of the steel bar protection layer tester in any one of claims 1-7; the calibration test pieces are arranged in a line, each calibration test piece is arranged in order according to the directions of the upper surface, the lower surface, the left side surface and the right side surface of each calibration test piece, and the distance between the centers of the first through holes of the adjacent calibration test pieces is 100mm-160 mm.
10. The calibration device for the steel bar protective layer tester as claimed in claim 9, wherein: also includes a position marking mechanism; the position marking mechanism is arranged on the upper surfaces of the calibration test piece assemblies; the position marking mechanism comprises a sliding rod and a plurality of pointers, wherein the sliding rod is provided with a sliding chute in the middle; the pointer is slidably disposed in the chute.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922002735.9U CN210570585U (en) | 2019-11-19 | 2019-11-19 | Calibration piece and calibration device of reinforcing bar protective layer tester |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922002735.9U CN210570585U (en) | 2019-11-19 | 2019-11-19 | Calibration piece and calibration device of reinforcing bar protective layer tester |
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| CN210570585U true CN210570585U (en) | 2020-05-19 |
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