CN107238379A - Measuring for verticality method - Google Patents
Measuring for verticality method Download PDFInfo
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- CN107238379A CN107238379A CN201710609419.0A CN201710609419A CN107238379A CN 107238379 A CN107238379 A CN 107238379A CN 201710609419 A CN201710609419 A CN 201710609419A CN 107238379 A CN107238379 A CN 107238379A
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- base
- verticality
- measuring
- joint bar
- prefabricated components
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C15/00—Surveying instruments or accessories not provided for in groups G01C1/00 - G01C13/00
- G01C15/12—Instruments for setting out fixed angles, e.g. right angles
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
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- A Measuring Device Byusing Mechanical Method (AREA)
Abstract
The present invention relates to building field, in particular to measuring for verticality method.The invention provides a kind of measuring for verticality method, joint bar perpendicularity in prefabricated components is detected by joint bar testing apparatus for verticality, this method obtains the result of joint bar perpendicularity deviation by field measurement and through Simple Calculation, is provided for the installability in prefabricated concrete structure construction process according to so as to add the accuracy of construction in later period.Present invention also offers a kind of measuring for verticality method, prefabricated components middle sleeve perpendicularity is detected by sleeve testing apparatus for verticality, this method obtains the result of sleeve perpendicularity deviation by field measurement and through Simple Calculation, is provided for the installability in prefabricated concrete structure construction process according to so as to add the accuracy of construction in later period.
Description
Technical field
The present invention relates to building field, in particular to measuring for verticality method.
Background technology
In assembled architecture, due to grout sleeve interconnection technique maturation, dependable performance, easy construction, receive more next
More applications.To ensure that each reserved joint bar can be stretched into accurately in corresponding sleeve during the lifting construction of component
Assembling could be completed, even if the perpendicularity of a reserved joint bar or sleeve occurs in that the deviation more than allowable error scope, all can
Cause whole component not assemble, have a strong impact on construction speed.Therefore, the perpendicularity of reserved joint bar and sleeve is in prefabricated components
Influence the key factor of connection.
Existing national standards《Concrete structure engineering construction quality accident specification》And professional standard (GB50204-2015)
《Reinforced bar sleeve grouting connection application technology code》(JGJ355-2015) inspection of the reserved joint bar on prefabricated components is used in
The method that the inspection of observation, the method for dipstick metering to embedded sleeve barrel uses dipstick metering.It is well known that in squareness measurement, needing first
A reference vehicular face is determined, the vertical range difference at measurand two ends to the reference plane is perpendicularity deviation.And existing
Have it is actually detected during, testing staff is mostly based on range estimation, and the component auxiliary that query is there may be to range estimation uses dipstick metering
Mode.The mode of observation and dipstick metering is difficult to determine reference vehicular face, and the accurate measurement to joint bar and sleeve perpendicularity is even more difficult
Upper plus hardly possible, the more technical merits and engineering experience for relying on testing staff itself of existing metering system, different testing staff are to same
Even there is the conclusion completely contradicted in the judgement of a piece joint bar or sleeve perpendicularity.Accordingly, it would be desirable to which one kind is to detect perpendicularity
Method and develop corresponding device.
The content of the invention
It is an object of the present invention to provide a kind of measuring for verticality method, is detected by joint bar testing apparatus for verticality
Joint bar perpendicularity in prefabricated components, this method obtains the result of joint bar perpendicularity deviation by field measurement and through Simple Calculation,
There is provided for the installability in prefabricated concrete structure construction process according to so as to add the accuracy of construction in later period.
Second object of the present invention is there is provided a kind of measuring for verticality method, by field measurement and through simple
Calculate and obtain the result of sleeve perpendicularity deviation, for the installability in prefabricated concrete structure construction process provide according to
According to so as to add the accuracy of construction in later period.
What embodiments of the invention were realized in：
A kind of measuring for verticality method, it comprises the following steps：
Step a：The sleeve pipe of joint bar testing apparatus for verticality is set on the joint bar being connected with prefabricated components, joint bar is hung down
One side of the base away from sleeve pipe in straightness detecting device is abutted with prefabricated components；
Step b：In the gap of clearance gauge inserted base and prefabricated components, clearance distance will be obtained for x；
Step c：The a length of a of pedestal edge, passes through formulaTry to achieve angle of inclination beta.
This method calculates the result for obtaining perpendicularity deviation according to actual needs, adds construction by above-mentioned formula
Accuracy.
In a kind of embodiment of the present invention：
Measuring for verticality method also includes step d, step d：Joint bar horizontal direction offset distance is Δ, joint bar vertical direction
Length is L, passes through formulaTry to achieve perpendicularity deviation.
In a kind of embodiment of the present invention：
Joint bar testing apparatus for verticality includes base and sleeve pipe；Through hole is offered on base, sleeve pipe passes through through hole and bottom
Seat connection, sleeve pipe bearing of trend is vertical with one side of the base away from sleeve pipe.
In a kind of embodiment of the present invention：
Internal thread is offered on through-hole wall；Sleeve pipe possesses the thread segment of close base and the active section away from base；Spiral shell
External screw thread is offered on line section outer peripheral face；Sleeve pipe is connected through a screw thread with base.
In a kind of embodiment of the present invention：
Rectangular cross-section of the base in the vertical direction of sleeve pipe bearing of trend.
A kind of measuring for verticality method, it comprises the following steps：
Step a：By in the sleeve on the intubation insertion prefabricated components of sleeve testing apparatus for verticality, examine sleeve perpendicularity
The base surveyed in device is abutted close to the one side of intubation with prefabricated components；
Step b：In the gap of clearance gauge inserted base and prefabricated components, clearance distance will be obtained for x '；
Step c：The a length of α ' of pedestal edge, passes through formulaTry to achieve angle of inclination beta '.
This method calculates the result for obtaining perpendicularity deviation according to actual needs, is assembled coagulation by above-mentioned formula
Installability in soil structure construction process is provided according to so as to add the accuracy of construction in later period.
In a kind of embodiment of the present invention：
Measuring for verticality method also includes step d, step d：Sleeve horizontal direction offset distance be Δ ', sleeve Vertical Square
It is L ' to depth, passes through formulaTry to achieve perpendicularity deviation.
In a kind of embodiment of the present invention：
Sleeve testing apparatus for verticality includes base and intubation；Through hole is offered on base, intubation passes through through hole and base
Connection, intubation bearing of trend is vertical close to the one side of intubation with base.
In a kind of embodiment of the present invention：
Internal thread is offered on through-hole wall；Intubation possesses the thread segment of close base and the active section away from base；Spiral shell
External screw thread is offered on line section outer peripheral face；Intubation is connected through a screw thread with base.
In a kind of embodiment of the present invention：
The length of thread segment is less than the depth of through hole.
Technical scheme at least possesses following beneficial effect：
The invention provides a kind of measuring for verticality method, detected in prefabricated components and inserted by joint bar testing apparatus for verticality
Muscle perpendicularity, this method obtains the result of joint bar perpendicularity deviation by field measurement and through Simple Calculation, is assembled coagulation
Installability in soil structure construction process is provided according to so as to add the accuracy of construction in later period.
Present invention also offers a kind of measuring for verticality method, sleeve is obtained by field measurement and through Simple Calculation vertical
The result of deviation is spent, is provided for the installability in prefabricated concrete structure construction process according to so as to add the later stage
The accuracy of construction.
Brief description of the drawings
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below will be attached to what is used required in embodiment
Figure is briefly described, it will be appreciated that the following drawings illustrate only certain embodiments of the present invention, therefore is not construed as pair
The restriction of scope, for those of ordinary skill in the art, on the premise of not paying creative work, can also be according to this
A little accompanying drawings obtain other related accompanying drawings.
Fig. 1 is the use state schematic diagram of joint bar testing apparatus for verticality in the embodiment of the present invention 1；
Fig. 2 is Fig. 1 rough schematic views；
Fig. 3 is the use state schematic diagram of the middle sleeve testing apparatus for verticality of the embodiment of the present invention 2；
Fig. 4 is Fig. 3 rough schematic views.
In figure：110- prefabricated components；120- joint bars；130- clearance gauges；140- sleeves；200- joint bar testing apparatus for verticality；
210- bases；220- sleeve pipes；300- sleeve testing apparatus for verticality；310- bases；320- is intubated.
Embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
A part of embodiment of the present invention, rather than whole embodiments.The present invention implementation being generally described and illustrated herein in the accompanying drawings
The component of example can be arranged and designed with a variety of configurations.
Therefore, the detailed description of embodiments of the invention below to providing in the accompanying drawings is not intended to limit claimed
The scope of the present invention, but be merely representative of the present invention selected embodiment.Based on the embodiment in the present invention, this area is common
The every other embodiment that technical staff is obtained under the premise of creative work is not made, belongs to the model that the present invention is protected
Enclose.
It should be noted that：Similar label and letter represents similar terms in following accompanying drawing, therefore, once a certain Xiang Yi
It is defined in individual accompanying drawing, then it further need not be defined and explained in subsequent accompanying drawing.
In the description of embodiment of the present invention, it is necessary to explanation, term " interior ", " outer ", " on " etc. instruction orientation
Or position relationship is or the orientation that the invention product is usually put when using based on orientation shown in the drawings or position relationship
Or position relationship, it is for only for ease of the description present invention and simplifies description, rather than indicates or imply signified device or element
There must be specific orientation, with specific azimuth configuration and operation, therefore be not considered as limiting the invention.
In the existing detection process to prefabricated components joint bar and sleeve perpendicularity, testing staff mostly based on range estimation,
The component that query is there may be to range estimation is aided in by the way of dipstick metering.The mode of range estimation and dipstick metering is difficult to determine reference vehicular
Face, the accurate measurement to joint bar and sleeve perpendicularity is even more extremely difficult, and existing metering system is more to rely on testing staff itself
Technical merit and engineering experience, even there is completely phase to the judgement of same joint bar or sleeve perpendicularity in different testing staff
Anti- conclusion.Accordingly, it would be desirable to a kind of method to detect perpendicularity.
According to the deficiencies in the prior art, there is provided detailed description below：
Embodiment 1
Include prefabricated components 110, joint bar 120, clearance gauge 130 and joint bar testing apparatus for verticality 200 with reference to Fig. 1, Fig. 1.Insert
Muscle testing apparatus for verticality 200 includes base 210 and sleeve pipe 220.Offer through hole on base 210, sleeve pipe 220 by through hole with
Base 210 is connected.The bearing of trend of sleeve pipe 220 is vertical with one side of the base 210 away from sleeve pipe 220.Also open on the inner walls of the via
Provided with internal thread.Sleeve pipe 220 possesses the thread segment of close base 210 and the active section away from base 210, in thread segment outer peripheral face
On offer external screw thread, sleeve pipe 220 is connected through a screw thread with base 210.Base 210 sleeve pipe 220 bearing of trend it is vertical
Direction rectangular cross-section.In the present embodiment, section is square, in other embodiments, can also be rectangle.
In a kind of measuring for verticality method of the present embodiment, step a is that joint bar 120 is connected with prefabricated components 110, and
One end stretches out in prefabricated components 110.Sleeve pipe 220 in joint bar testing apparatus for verticality 200 is by joint bar 120 away from prefabricated components
110 one end is set on joint bar 120, and controls one side of the base 210 away from sleeve pipe 220 to be abutted with the surface of prefabricated components 110.
Due to out of plumb between joint bar 120 and prefabricated components 110, the middle sleeve 220 of joint bar testing apparatus for verticality 200 and base 210 hang down
Directly, therefore after sleeve pipe 220 is sheathed on joint bar 120 and base 210 is abutted with the surface of prefabricated components 110, base 210 and prefabricated structure
Part 110 can have gap on surface.Carry out step b：Gap between the inserted base 210 of clearance gauge 130 and prefabricated components 110
In.
Further, in order that clearance gauge 130 is smoothly inserted in gap, in the present embodiment, clearance gauge 130 possesses right-angled trapezium
Outline, in addition, in order to intuitively read the distance between base 210 and prefabricated components 110 using clearance gauge 130, in clearance gauge
Scale is additionally provided with 130 inclined-planes, the scale is used to show the distance between prefabricated components 110 and base 210.Due to prefabricated components
110 surfaces there may be the situation of out-of-flatness, therefore repeatedly be measured according to actual conditions, take the maximum in gap.Need explanation
It is that in other embodiments, according to actual use situation, clearance gauge 130 can be other forms, it is each that such as engineering is commonly used
Plant the clearance gauge 130 of shape.
With reference to Fig. 2, in use, the verticality measurement device of joint bar 120 is set on joint bar 120, and by clearance gauge
130 inserted bases 210 are with the gap of prefabricated components 110, obtaining maximum clearance distance x.Due to joint bar testing apparatus for verticality
200 base 210 is square, and the square section length of side fixes, thus the clearance distance x of base 210 and prefabricated components 110 with just
Square-section length of side a ratio is the sine value that joint bar 120 deviates the angle of the vertical line of prefabricated components 110.
In step c, joint bar 120 deviates gap of the angle of the vertical line of prefabricated components 110 for base 210 and prefabricated components 110
Apart from x and the arcsin function of square section length of side a ratio.Pass through formulaObtain angle of inclination beta.
Further, in engineering in use, usually vertical with joint bar 120 using the horizontal direction offset distance Δ of joint bar 120
Direction length L ratio represents perpendicularity deviation, i.e., above-mentioned joint bar 120 is deviateed to the angle of the vertical line of prefabricated components 110 by step e
Degree β takes tangent to be worth to the horizontal direction offset distance Δ of joint bar 120 and represents perpendicularity deviation with the vertical-direction length L of joint bar 120.
Pass through formulaTry to achieve perpendicularity deviation.
A kind of measuring for verticality method that the present embodiment is provided, including：
Step a：The sleeve pipe 220 of joint bar testing apparatus for verticality 200 is set in the joint bar being connected with prefabricated components 110
On 120, one side of the base 210 away from sleeve pipe 220 in joint bar testing apparatus for verticality 200 is set to be abutted with prefabricated components 110.
Step b：By the inserted base 210 of clearance gauge 130 with the gap of prefabricated components 110, obtaining clearance distance for x.
Step c：The length of side of base 210 is α, passes through formulaTry to achieve angle of inclination beta.
And step d is carried out according to actual needs：The horizontal direction offset distance of joint bar 120 is Δ, and the vertical direction of joint bar 120 is long
Spend for L, pass through formulaTry to achieve perpendicularity deviation.
This method measures the perpendicularity of joint bar 120 using joint bar testing apparatus for verticality 200, and by field measurement and through letter
The result for obtaining the perpendicularity deviation of joint bar 120 is easily calculated, is the installability in prefabricated concrete structure construction process
There is provided according to so as to add the accuracy of construction in later period.
Embodiment 2
Include prefabricated components 110, sleeve 140, clearance gauge 130 and sleeve testing apparatus for verticality 300 with reference to Fig. 3, Fig. 3.Set
Cylinder testing apparatus for verticality 300 includes base 310 and intubation 320.Offer through hole on base 310, intubation 320 by through hole with
Base 310 is connected.It is intubated 320 bearing of trends vertical close to the one side of intubation 320 with base 310.Also open on the inner walls of the via
Provided with internal thread.Intubation 320 possesses the thread segment of close base 310 and the active section away from base 310, in thread segment outer peripheral face
On offer external screw thread, intubation 320 is connected through a screw thread with base 310.Base 310 is being intubated the vertical of 320 bearing of trend
Direction rectangular cross-section, section is square in this embodiment, in other embodiments, can also be rectangle.
In addition to the thread segment stretching contact surface of base 310 can influence measurement accuracy, intubation 320 is with the contact surface of base 310
No holding is vertical also to have influence on Surveying Actual Precision, and active section pipe thickness is 2mm-5mm, in the present embodiment, active section pipe
Wall is 2.5mm, in order to intubation 320 with base 310 coordinate after, can intuitively check intubation 320 whether vertically with base 310
Coordinate, thread segment pipe thickness is less than active section pipe thickness, typically between 0.5mm-1mm, to take in the present embodiment
0.7mm。
In a kind of measuring for verticality method of the present embodiment, the intubation in step a middle sleeves testing apparatus for verticality 300
320 are inserted in sleeve 140 by the one end of sleeve 140 away from prefabricated components 110, and control base 310 close to the one of intubation 320
Face is abutted with the surface of prefabricated components 110.Due to out of plumb between sleeve 140 and prefabricated components 110, sleeve testing apparatus for verticality
Intubation 320 and base 310 are vertical in 300, therefore in interior and the close intubation 320 of base 310 the one side of 320 insertion sleeve of intubation 140
After being abutted with the surface of prefabricated components 110, there can be gap between base 310 and the surface of prefabricated components 110.Carry out step b：Plug
In gap between the inserted base 310 of chi 130 and prefabricated components 110.
Further, in order that clearance gauge 130 is smoothly inserted in gap, in the present embodiment, clearance gauge 130 possesses right-angled trapezium
Outline, in addition, in order to intuitively read the distance between base 310 and prefabricated components 110 using clearance gauge 130, in clearance gauge
Scale is additionally provided with 130 inclined-planes, the scale is used to show the distance between prefabricated components 110 and base 310.Need explanation
It is that in other embodiments, according to actual use situation, clearance gauge 130 can be other forms, it is each that such as engineering is commonly used
Plant the clearance gauge 130 of shape.
With reference to Fig. 4, in use, the verticality measurement device of sleeve 140 is inserted in sleeve 140, and by clearance gauge
130 inserted bases 310 are with the gap of prefabricated components 110, obtaining clearance distance.Because the surface of prefabricated components 110 there may be
The situation of out-of-flatness, therefore repeatedly measured according to actual conditions, take the maximum in gap.Additionally due to the bottom of testing apparatus for verticality
Seat 310 is square, and the square section length of side is fixed, therefore the clearance distance and square section of base 310 and prefabricated components 110
The ratio of the length of side is the sine value that sleeve 140 deviates the angle of the vertical line of prefabricated components 110.
In step c, sleeve 140 deviates gap of the angle of the vertical line of prefabricated components 110 for base 310 and prefabricated components 110
The arcsin function of ultimate range x ' and square section length of side α ' ratio.Pass through formulaInclined
Oblique angle β '.
Further, in engineering in use, usually utilizing the horizontal direction offset distance Δ of sleeve 140 ' vertical with sleeve 140
Direction length L ' ratio represents perpendicularity deviation, i.e., above-mentioned sleeve 140 is deviateed into the vertical line of prefabricated components 110 by step e
Angle takes tangent to be worth to the horizontal direction offset distance Δ of sleeve 140 ' inclined with the vertical-direction length L ' expression perpendicularity of sleeve 140
Difference.Pass through formulaTry to achieve perpendicularity deviation.
A kind of measuring for verticality method that the present embodiment is provided, including：
Step a：The intubation 320 of sleeve testing apparatus for verticality 300 is inserted in the sleeve 140 on prefabricated components 110, made
Base 310 in sleeve testing apparatus for verticality 300 is abutted close to the one side of intubation 320 with prefabricated components 110；
Step b：By the inserted base 310 of clearance gauge 130 with the gap of prefabricated components 110, obtaining clearance distance for x '；
Step c：The length of side of base 310 is α ', passes through formulaTry to achieve angle of inclination beta '.
And step d is carried out according to actual needs：The horizontal direction offset distance of sleeve 140 be Δ ', the vertical direction of sleeve 140
Depth is L ', passes through formulaTry to achieve perpendicularity deviation.
This method utilizes the perpendicularity of 300 measuring set of cylinder of sleeve testing apparatus for verticality 140, and by field measurement and through letter
The result for obtaining the perpendicularity deviation of sleeve 140 is easily calculated, is the installability in prefabricated concrete structure construction process
There is provided according to so as to add the accuracy of construction in later period.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.Within the spirit and principles of the invention, that is made any repaiies
Change, equivalent substitution, improvement etc., should be included in the scope of the protection.
Claims (10)
1. a kind of measuring for verticality method, it is characterised in that comprise the following steps：
Step a：The sleeve pipe of joint bar testing apparatus for verticality is set on the joint bar being connected with prefabricated components, makes joint bar perpendicularity
One side of the base away from described sleeve pipe in detection means is abutted with the prefabricated components；
Step b：In the gap that clearance gauge is inserted to the base and prefabricated components, clearance distance is obtained for x；
Step c：The a length of a of pedestal edge, passes through formulaTry to achieve angle of inclination beta.
2. a kind of measuring for verticality method according to claim 1, it is characterised in that：
The measuring for verticality method also includes step d, step d：The joint bar horizontal direction offset distance is Δ, the joint bar
Vertical-direction length is L, passes through formulaTry to achieve perpendicularity deviation.
3. a kind of measuring for verticality method according to claim 1, it is characterised in that：
The joint bar testing apparatus for verticality includes base and sleeve pipe；Through hole is offered on the base, described sleeve pipe passes through
The through hole is connected with the base, and described sleeve pipe bearing of trend is vertical with one side of the base away from sleeve pipe.
4. a kind of measuring for verticality method according to claim 3, it is characterised in that：
Internal thread is offered on the through-hole wall；Described sleeve pipe possesses close to the thread segment of the base and away from the base
Active section；External screw thread is offered on the thread segment outer peripheral face；Described sleeve pipe is connected through a screw thread with the base.
5. a kind of measuring for verticality method according to claim 3, it is characterised in that：
Rectangular cross-section of the base in the vertical direction of described sleeve pipe bearing of trend.
6. a kind of measuring for verticality method, it is characterised in that comprise the following steps：
Step a：By in the sleeve on the intubation insertion prefabricated components of sleeve testing apparatus for verticality, fill sleeve measuring for verticality
Base in putting is abutted close to the one side of the intubation with the prefabricated components；
Step b：In the gap that clearance gauge is inserted to the base and prefabricated components, clearance distance is obtained for x '；
Step c：The a length of a ' of pedestal edge, passes through formulaTry to achieve angle of inclination beta '.
7. a kind of measuring for verticality method according to claim 6, it is characterised in that：
The measuring for verticality method also includes step d, step d：The sleeve horizontal direction offset distance be Δ ', the set
Cylinder vertical direction depth is L ', passes through formulaTry to achieve perpendicularity deviation.
8. a kind of measuring for verticality method according to claim 6, it is characterised in that：
The sleeve testing apparatus for verticality includes base and intubation；Through hole is offered on the base, the intubation passes through institute
State through hole to be connected with the base, the intubation bearing of trend is vertical with one side of the base away from intubation.
9. a kind of measuring for verticality method according to claim 8, it is characterised in that：
Internal thread is offered on the through-hole wall；The intubation possesses close to the thread segment of the base and away from the base
Active section；External screw thread is offered on the thread segment outer peripheral face；The intubation is connected through a screw thread with the base.
10. a kind of measuring for verticality method according to claim 9, it is characterised in that：
The length of the thread segment is less than the depth of the through hole.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109403953A (en) * | 2018-11-16 | 2019-03-01 | 中铁三局集团有限公司 | A kind of quick device for accurately measuring of drilling pile body verticality and method |
| CN112683141A (en) * | 2021-01-29 | 2021-04-20 | 中国建筑科学研究院有限公司 | Method for detecting perpendicularity of sleeve and dowel bar on prefabricated part |
| CN114923461A (en) * | 2022-05-17 | 2022-08-19 | 中建八局第一建设有限公司 | Perpendicularity detection device for building construction |
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| CN206905686U (en) * | 2017-07-25 | 2018-01-19 | 四川省建筑科学研究院 | A kind of sleeve testing apparatus for verticality and measuring for verticality structure |
| CN206905766U (en) * | 2017-07-25 | 2018-01-19 | 四川省建筑科学研究院 | A kind of joint bar testing apparatus for verticality and measuring for verticality structure |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109403953A (en) * | 2018-11-16 | 2019-03-01 | 中铁三局集团有限公司 | A kind of quick device for accurately measuring of drilling pile body verticality and method |
| CN112683141A (en) * | 2021-01-29 | 2021-04-20 | 中国建筑科学研究院有限公司 | Method for detecting perpendicularity of sleeve and dowel bar on prefabricated part |
| CN114923461A (en) * | 2022-05-17 | 2022-08-19 | 中建八局第一建设有限公司 | Perpendicularity detection device for building construction |
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