CN106225654B - A kind of concrete surface roughness measuring device and its measurement method - Google Patents
A kind of concrete surface roughness measuring device and its measurement method Download PDFInfo
- Publication number
- CN106225654B CN106225654B CN201610829677.5A CN201610829677A CN106225654B CN 106225654 B CN106225654 B CN 106225654B CN 201610829677 A CN201610829677 A CN 201610829677A CN 106225654 B CN106225654 B CN 106225654B
- Authority
- CN
- China
- Prior art keywords
- graduated scale
- survey line
- concrete surface
- measured value
- fixed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/28—Measuring arrangements characterised by the use of mechanical techniques for measuring roughness or irregularity of surfaces
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- A Measuring Device Byusing Mechanical Method (AREA)
- Length-Measuring Instruments Using Mechanical Means (AREA)
Abstract
The invention discloses a kind of concrete surface roughness measuring devices, including the graduated scale being transversely arranged, and the left and right both ends of graduated scale are equipped with fixed pin along longitudinal direction, and the top of fixed pin is equipped with screw thread, and is threadedly coupled with graduated scale by screw thread；Connecting rod is slidably connected on graduated scale between two fixed pins, connecting rod extends longitudinally and the lower end of connecting rod is provided with dial gauge, and the dial gauge includes dial plate and measuring rod, and the measuring rod is located at the lower section of dial plate and measuring rod extends longitudinally；One end of graduated scale is provided with the protractor with pointer, and pointer upper edge pointer direction is fixed with the first levelling tube；It is transversely fixed with the second level pipe on graduated scale, third levelling tube is equipped with along longitudinal direction in one end of graduated scale, two fixed pins and connecting rod；Also disclose the method for carrying out roughness concentration using above-mentioned apparatus.The present invention is easy to carry, is adapted to the roughness concentration of non-horizontal surface and irregular component, easy to operate, as a result reliably.
Description
Technical field
Material Testing Technology field of the present invention, and in particular to a kind of concrete surface roughness measuring device and its measurement side
Method.
Background technology
In Practical Project, new, old concrete bonding is frequently problem in concrete works, such as newly-built concrete
Construction joint in structure, new, the old concrete faying face etc. in Old building maintenance and reinforcement engineering, adhesion of new and old concrete interface is mixed
Xtah Crude Clay structure weakness zone, in order to enhance new, old adhesive property, it is common method to carry out dabbing to faying face, but right
Lack quantitative analysis method with evaluation in the measurement of dabbing degree of roughness.
Concrete sand replacement method is the common method for measuring concrete surface roughness.It will be waited for plastic plate (or plank)
It surveys concrete surface (areal cross-section area is S) to fence up, keeps the highest plane of plastic plate concordant with the peak on surface,
Normal sand is poured on surface and is smoothed out with plastics plate top surface, and then the sand in process face is all poured into graduated cylinder, measures its body
V is accumulated, then roughness H (sand replacement method depth) is：
H=V/S
Sand replacement method needs to prepare normal sand, inconvenient to carry, and remaining sand is not easy to thoroughly remove on bonding plane after test, measures
Complex steps, and it is not used to the roughness test of non-horizontal surface component and irregular component, it is unfavorable for the actual application of engineering,
It is simply possible to use in experimental study.
Invention content
Based on the deficiencies of the prior art, the present invention provides a kind of concrete surface roughness measuring device and its measurement sides
Method.
To achieve the goals above, the technical solution adopted by the present invention is as follows：
A kind of concrete surface roughness measuring device, including the graduated scale that is transversely arranged, the left and right both ends of graduated scale
It is equipped with fixed pin along longitudinal direction, the top of fixed pin is equipped with screw thread, and is threadedly coupled with graduated scale by screw thread；Two fixed pins
Between be equipped with connecting rod along longitudinal direction, upper end and the graduated scale of connecting rod be slidably connected, and the lower end of connecting rod is provided with dial gauge, institute
It includes dial plate and measuring rod to state dial gauge, and the measuring rod is located at the lower section of dial plate and measuring rod extends longitudinally；Graduated scale
One end is provided with the protractor with pointer, and pointer upper edge pointer direction is fixed with the first levelling tube.
Preferably, the second level pipe, one end of graduated scale, two fixed pins and connecting rod are transversely fixed on graduated scale
On along longitudinal direction be equipped with third levelling tube.
Preferably, the protractor is 360 ° of protractors.
The method for carrying out roughness concentration using above-mentioned concrete surface roughness measuring device, includes the following steps：
Step 1, adjust fixed pin, make concrete surface to be measured protrusion and pit in the measurement range of dial gauge,
Calibrate fixed pin and the verticality and dial gauge of graduated scale and the verticality of graduated scale；
Concrete surface to be measured delimited the survey line that m items are mutually parallel, the length of survey line by step 2 according to identical spacing
No more than the range of graduated scale；Protractor pointer angle is adjusted according to the included angle of concrete surface to be measured and horizontal plane, is led to
The side that concrete surface roughness measuring device is fixed on survey line by fixed pin is crossed, and bubble is placed in the middle in the first levelling tube；
Step 3, for every survey line, the one end for selecting survey line is datum mark, by dial gauge along survey line according to identical
Step pitch measure to the other end of survey line, obtain n measured value；
The roughness H of j-th strip survey linejCalculation formula it is as follows：
Wherein, j-th strip survey line is any one survey line in m survey line,For i-th of measured value of j-th strip survey line, i-th
A measured value is any one measured value in n measured value,For maximum measured value in n measured value of j-th strip survey line,For j-th strip
The mean value of n measured value of survey line；
The then mean roughness of m survey lineFor：
Step 4, according toThe roughness H on concrete surface to be measured is calculated；
Wherein, A is coefficient, and the numerical value of A is only related with the spacing of m survey line and the measurement step pitch of every survey line；The numerical value of A
Obtain for the first time can be by measuring roughness H to concrete surface to be measured using sand replacement method0, recycle above method step 1 to three
It obtainsThen basisA is calculated, an A value only corresponds to the measurement of a kind of survey line spacing and every survey line
Step pitch.
Preferably, in step 1 the verticality of the verticality and dial gauge and graduated scale of fixed pin and graduated scale calibration
Method includes the following steps：
(1) graduated scale is transversely-placed, the pointer of protractor is allocated to 0 °, the first levelling tube and the second level Guan Junqi
Bubble is placed in the middle, and the bubble in 4 third levelling tubes occupy top；
(2) graduated scale is placed along longitudinal direction, the pointer of protractor is allocated to 90 °, the first levelling tube and graduated scale one end
The equal bubble of third levelling tube is placed in the middle, two fixed pins and connecting rod is adjusted, so that the third water in two fixed pins and connecting rod
Quasi- pipe bubble is placed in the middle.
It is accurate that the present invention measures, easy to carry, when carrying out concrete surface roughness measuring using the present invention, operation letter
Just, as a result reliably, it is adapted to the roughness concentration of non-horizontal surface and irregular component, there is larger implementary value to be imitated with economical
Benefit.
Description of the drawings
Fig. 1 is the structural schematic diagram of concrete surface roughness measuring device of the present invention；
Fig. 2 is the schematic diagram that the present invention measures concrete horizontal surface roughness；
Fig. 3 is the schematic diagram that the present invention measures concrete vertical surface roughness
Fig. 4 is the schematic diagram that the present invention measures concrete tilt surface roughness.
Specific implementation mode
As shown in Figure 1, a kind of concrete surface roughness measuring device, including the graduated scale 1 that is transversely arranged, graduated scale
1 left and right both ends are equipped with fixed pin 2 along longitudinal direction, and the top of fixed pin 2 is equipped with screw thread, and passes through screw thread and 1 screw thread of graduated scale
Connection；Graduated scale between two fixed pins 2 is equipped with connecting rod 5, and connecting rod 5 extends longitudinally, the upper end cap of connecting rod 5
Loaded on graduated scale 1, so that connecting rod 5 can be slided along graduated scale 1, the lower end of connecting rod 5 is fixed with dial gauge 6, the percentage
Table 6 includes dial plate and measuring rod, and the measuring rod is located at the axis of the lower section of dial plate and the longitudinal center line and connecting rod 5 of measuring rod
It is overlapped to center line；The left end of graduated scale 1 is provided with the protractor 3 with pointer 4, and the protractor 3 is 360 ° of protractors, described
Pointer 4 is rotated around the center of circle of protractor 3, and 4 upper edge pointer of pointer, 4 direction is inlaid with the first levelling tube 8.1 upper edge of graduated scale is horizontal
To the second level pipe 7 is inlaid with, it is inlaid with third water along longitudinal direction in the left end of graduated scale 1, two fixed pins 2 and connecting rod 5
Quasi- pipe 9.
Wherein, the range of graduated scale 1 is 0~150mm, minimum scale 1mm；The range of dial gauge 6 is 0~50mm.
As shown in figs. 2 to 4, the method for roughness concentration is carried out such as using above-mentioned concrete surface roughness measuring device
Under：
Step 1, adjust fixed pin 2, make concrete surface 10 to be measured protrusion and pit in the measurement model of dial gauge 6
In enclosing, calibration fixed pin 2 and the verticality of graduated scale 1 and the verticality of dial gauge 6 and graduated scale 1；
Step 2 will delimit the survey line that m items are mutually parallel on concrete surface 10 to be measured according to identical spacing, survey line
Length is not more than the range of graduated scale 1；3 pointer of protractor is adjusted according to concrete surface 10 to be measured and the included angle of horizontal plane
Concrete surface roughness measuring device is fixed on the side of survey line, and gas in the first levelling tube 8 by fixed pin 2 by 4 angles
Bubble is placed in the middle；
Step 3, for every survey line, the one end for selecting survey line is datum mark, by dial gauge 6 along survey line according to phase
Same step pitch is measured to the other end of survey line, is recorded the reading of dial gauge 6, is obtained n measured value；
The roughness H of j-th strip survey linejCalculation formula it is as follows：
Wherein, j-th strip survey line is any one survey line in m survey line,For i-th of measured value of j-th strip survey line, i-th
A measured value is any one measured value in n measured value,For maximum measured value in n measured value of j-th strip survey line,It is surveyed for j-th strip
The mean value of n measured value of line；
The then mean roughness of m survey lineFor：
Step 4, according toThe roughness H on concrete surface 10 to be measured is calculated；Wherein, A is coefficient, A
Numerical value it is only related with the spacing of m survey line and the measurement step pitch of every survey line.
Fixed pin 2 and the verticality of graduated scale 1 and the calibration side of dial gauge 6 and the verticality of graduated scale 1 in step 1
Method includes the following steps：
(1) graduated scale 1 is transversely-placed, the pointer 4 of protractor 3 is allocated to 0 °, the first levelling tube 8 and the second level pipe
7 equal bubbles are placed in the middle, and the bubble in 4 third levelling tubes 9 occupy top；
(2) graduated scale 1 is placed along longitudinal direction, the pointer 4 of protractor 3 is allocated to 90 °, the first levelling tube 8 and graduated scale 1 one
The 9 equal bubble of third levelling tube at end is placed in the middle, two fixed pins 2 and connecting rod 5 is adjusted, so that in two fixed pins 2 and connecting rod 5
9 bubble of third levelling tube it is placed in the middle.
In step 2, when two fixed pins 2 are fixed on concrete surface, such as concrete 10 curtailment of surface to be measured,
Firm cushion block can be also set in concrete both sides, two fixed pins 2 are fixed on cushion block.If concrete surface 10 to be measured is
Horizontal (as shown in Figure 2), also observable the second level pipe 7, by adjusting fixed pin 2, (fixed pin 2 is relative to the rotation of graduated scale 1
Into or screw out), keep the bubble in the second level pipe 7 placed in the middle；If concrete surface 10 to be measured is vertical (as shown in Figure 3),
Third levelling tube 9 on observable graduated scale 1 makes the bubble in the third levelling tube 9 on graduated scale 1 by adjusting fixed pin 2
Between two parties；If concrete surface 10 to be measured is inclined (as shown in Figure 4), the first levelling tube 8 can only be observed, by adjusting fixed pin
2, keep the bubble in the first levelling tube 8 placed in the middle.
In step 4, the numerical value of A obtains can be obtained by the above method for the first timeAgain H is measured with sand replacement method0, pass throughIt obtains, is as follows：
The cube shaped concrete sample that 6 pieces of length of sides are 150mm is rived, 2 splitting surfaces are formed per block concrete test specimen,
It is denoted as A and B respectively, being then formed by 12 splitting surfaces to 6 block concrete test specimens carries out roughness test.By splitting surface level
It places upward, selects line on the basis of a line of splitting surface, be parallel to datum line and delimit 5 surveys line, adjacent two surveys line successively
Between spacing be 30mm, near datum line a spacing between survey line and datum line be 15mm；Each is surveyed
Line, the one end for selecting survey line is datum mark, by the equidistant measured value of 10mm step pitches, by dial gauge 6 along survey line according to identical
Step pitch is measured to the other end of survey line, is recorded the reading of dial gauge 6, is obtained 15 measured values.
H is calculated according to formula (1)j, calculated further according to formula (2)H is measured using sand replacement method again0.According to A is calculated, test result is as shown in table 1.
1 roughness test result of table
By table 1 as it can be seen that A is in [1.50,2.73] section, mean value 2.05, A values float less, distribution uniform.
Again 12 splitting surfaces are formed by 6 block concrete test specimens and carry out roughness test.Upward by splitting surface level
It places, selects line on the basis of a line of splitting surface, be parallel to datum line and delimit 5 surveys line successively, between adjacent two surveys line
Spacing be 30mm, near datum line a spacing between survey line and datum line be 15mm；For each survey line, choosing
One end of location survey line is that datum mark is surveyed dial gauge 6 along survey line by the equidistant measured value of 15mm step pitches according to identical step pitch
It measures to the other end of survey line, records the reading of dial gauge 6, obtain 10 measured values.
H is calculated according to formula (1)j, calculated further according to formula (2)H is measured using sand replacement method again0.According to A is calculated, test result is as shown in table 2.
2 roughness test result of table
As can be seen from Table 2, A is in [1.58,3.10] section, mean value 2.17, A values float less, distribution uniform, test
The calculating of Shi Caiyong A values can reduce error.
12 splitting surfaces are formed by 6 block concrete test specimens again and carry out roughness test.Upward by splitting surface level
It places, selects line on the basis of a line of splitting surface, be parallel to datum line and delimit 5 surveys line successively, between adjacent two surveys line
Spacing be 30mm, near datum line a spacing between survey line and datum line be 15mm；For each survey line, choosing
One end of location survey line is that datum mark is surveyed dial gauge 6 along survey line by the equidistant measured value of 5mm step pitches according to identical step pitch
It measures to the other end of survey line, records the reading of dial gauge 6, obtain 30 measured values.
H is calculated according to formula (1)j, calculated further according to formula (2)H is measured using sand replacement method again0.According to A is calculated, test result is as shown in table 3.
3 roughness test result of table
By table 3 as it can be seen that A is in [1.43,2.53] section, mean value 1.94, A values float less, distribution uniform.
Therefore when measuring roughness, when using survey line spacing, for 30mm, when the measurement step pitch of every survey line is 10mm, A values take
2.05；When using survey line spacing, for 30mm, when the measurement step pitch of every survey line is 15mm, A values take 2.17；When using survey line spacing
For 30mm, when the measurement step pitch of every survey line is 5mm, A values take 1.94.
When carrying out roughness test using above-mentioned concrete surface roughness measuring device, A known to above-mentioned three kinds may be selected
The measurement step pitch of survey line spacing and every survey line corresponding to any one in value, also can be according to the preparation method of above-mentioned A values, weight
The measurement step pitch of the new survey line spacing of new settings and every new survey line, to obtain corresponding new A values.According to measuring
Data calculate HjAndFurther according to formulaCalculate H.
The present invention is not limited to the above embodiments, and the above embodiments and description only describe the present invention's
Principle, various changes and improvements may be made to the invention without departing from the spirit and scope of the present invention, these change and change
Into all fall within the protetion scope of the claimed invention.
Claims (3)
1. a kind of measurement method of concrete surface roughness, it is characterised in that：Utilize concrete surface roughness measuring device
It measures, the concrete surface roughness measuring device, including the graduated scale being transversely arranged, left and right the two of graduated scale
End is equipped with fixed pin along longitudinal direction, and the top of fixed pin is equipped with screw thread, and is threadedly coupled with graduated scale by screw thread；Two fixations
Connecting rod is equipped between needle along longitudinal direction, upper end and the graduated scale of connecting rod are slidably connected, and the lower end of connecting rod is provided with dial gauge,
The dial gauge includes dial plate and measuring rod, and the measuring rod is located at the lower section of dial plate and measuring rod extends longitudinally；Graduated scale
One end be provided with the protractor with pointer, pointer upper edge pointer direction is fixed with the first levelling tube；
Measuring process is as follows：
Step 1, adjust fixed pin, make concrete surface to be measured protrusion and pit in the measurement range of dial gauge, calibration
The verticality of the verticality and dial gauge and graduated scale of fixed pin and graduated scale；
Concrete surface to be measured delimited the survey line that m items are mutually parallel by step 2 according to identical spacing, and the length of survey line is little
In the range of graduated scale；Protractor pointer angle is adjusted according to the included angle of concrete surface to be measured and horizontal plane, by solid
Determine the side that concrete surface roughness measuring device is fixed on survey line by needle, and bubble is placed in the middle in the first levelling tube；
Step 3, for every survey line, the one end for selecting survey line is datum mark, by dial gauge along survey line according to identical step
Away from measuring to the other end of survey line, n measured value is obtained；
The roughness H of j-th strip survey linejCalculation formula it is as follows：
Wherein, j-th strip survey line is any one survey line in m survey line,For i-th of measured value of j-th strip survey line, i-th of measured value
For any one measured value in n measured value,For maximum measured value in n measured value of j-th strip survey line,It is a for j-th strip survey line n
The mean value of measured value；
The then mean roughness of m survey lineFor：
Step 4, according toThe roughness H on concrete surface to be measured is calculated；
Wherein, A is coefficient.
2. the measurement method of concrete surface roughness according to claim 1, it is characterised in that：On graduated scale transversely
It is fixed with the second level pipe, third levelling tube is equipped with along longitudinal direction in one end of graduated scale, two fixed pins and connecting rod.
3. the measurement method of concrete surface roughness according to claim 1 or 2, it is characterised in that：The protractor
For 360 ° of protractors.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610829677.5A CN106225654B (en) | 2016-09-19 | 2016-09-19 | A kind of concrete surface roughness measuring device and its measurement method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610829677.5A CN106225654B (en) | 2016-09-19 | 2016-09-19 | A kind of concrete surface roughness measuring device and its measurement method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106225654A CN106225654A (en) | 2016-12-14 |
| CN106225654B true CN106225654B (en) | 2018-10-30 |
Family
ID=58075625
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610829677.5A Active CN106225654B (en) | 2016-09-19 | 2016-09-19 | A kind of concrete surface roughness measuring device and its measurement method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106225654B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109387139A (en) * | 2018-12-12 | 2019-02-26 | 武宇生 | Concrete surface roughness detecting method and tester |
| JP2020133102A (en) * | 2019-02-12 | 2020-08-31 | りんかい日産建設株式会社 | Evaluation method and evaluation device for concrete placing joint part |
| CN111811382A (en) * | 2020-06-10 | 2020-10-23 | 新兴铸管股份有限公司 | Measuring device and method for rapidly detecting flatness of material surface of sintering machine |
| CN111879282A (en) * | 2020-06-22 | 2020-11-03 | 济南市交通工程质量监督站 | Measuring instrument convenient for measuring point difference and gradient and using method thereof |
| CN113758459A (en) * | 2021-09-07 | 2021-12-07 | 郑州大学 | Method for quantitatively characterizing morphological characteristics of contact surface of high polymer grouting material and concrete |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101261111A (en) * | 2008-04-11 | 2008-09-10 | 浙江建设职业技术学院 | Concrete roughness measurement method |
| CN201688822U (en) * | 2010-05-19 | 2010-12-29 | 中船澄西船舶修造有限公司 | Surface irregularity measuring instrument |
| CN102967237A (en) * | 2012-12-04 | 2013-03-13 | 长沙理工大学 | Multifunctional measuring apparatus for erecting main cable strand of suspension bridge |
| CN104807390A (en) * | 2015-04-24 | 2015-07-29 | 河海大学 | Concrete surface characteristic measurement instrument and method |
| CN206037923U (en) * | 2016-09-19 | 2017-03-22 | 河南省水利科学研究院 | Concreted structure roughness measurement device |
-
2016
- 2016-09-19 CN CN201610829677.5A patent/CN106225654B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101261111A (en) * | 2008-04-11 | 2008-09-10 | 浙江建设职业技术学院 | Concrete roughness measurement method |
| CN201688822U (en) * | 2010-05-19 | 2010-12-29 | 中船澄西船舶修造有限公司 | Surface irregularity measuring instrument |
| CN102967237A (en) * | 2012-12-04 | 2013-03-13 | 长沙理工大学 | Multifunctional measuring apparatus for erecting main cable strand of suspension bridge |
| CN104807390A (en) * | 2015-04-24 | 2015-07-29 | 河海大学 | Concrete surface characteristic measurement instrument and method |
| CN206037923U (en) * | 2016-09-19 | 2017-03-22 | 河南省水利科学研究院 | Concreted structure roughness measurement device |
Non-Patent Citations (1)
| Title |
|---|
| 混凝土粘结面粗糙度测试方法研究;张启明 等;《河南科学》;20020830;第20卷(第4期);第411-413页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106225654A (en) | 2016-12-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106225654B (en) | A kind of concrete surface roughness measuring device and its measurement method | |
| CN206037923U (en) | Concreted structure roughness measurement device | |
| CN102589488B (en) | Optical vernier and method for detecting planeness and gradient using same | |
| CN101514885B (en) | Orifice plate type rock surface roughness mechanical measuring apparatus | |
| CN201311259Y (en) | Measuring scale for raised or depressed parameter of the surface of steel tube | |
| CN206656765U (en) | A kind of combination type multifunction water leveling ruler | |
| CN211178280U (en) | Verticality detection device easy and convenient to operate | |
| CN204855304U (en) | Self -compaction concrete slump divergence testing arrangement | |
| CN202734741U (en) | Simple template verticality measuring device | |
| CN207751827U (en) | A kind of concrete caving degree detecting device | |
| CN208091428U (en) | It is a kind of to accurately measure device for road and bridge construction | |
| CN206740037U (en) | A kind of concrete shrinkage dilatometer | |
| CN210638607U (en) | Pavement structure layer loose paving thickness detection device | |
| CN109521183B (en) | Slope surface water and soil loss amount measuring instrument and using method thereof | |
| CN106969693A (en) | A kind of expansion filling body test block expansion rate determines device | |
| CN207976083U (en) | A kind of auto parts and components measuring device | |
| CN206905744U (en) | A kind of new-type embankment grade rod | |
| CN206019541U (en) | A kind of detection means of the concavo-convex depth of concrete matsurface | |
| CN206648588U (en) | A kind of construction site measuring scale | |
| CN205300473U (en) | Mar measuring apparatu | |
| CN209706705U (en) | Crushing coarse aggregates value sample thickness measurement ruler | |
| CN205538553U (en) | Concrete flowability testboard | |
| CN209230515U (en) | Reinforcing bar scanning and slab thickness calibrating installation | |
| CN204128474U (en) | A kind ofly measure the device that concrete surface peels off degree | |
| CN210163876U (en) | Device for rapidly detecting compaction degree of road filling foundation |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |