CN106839960A - Nondestructive testing method for size and internal defects of mortise and tenon joint of wood structure - Google Patents
Nondestructive testing method for size and internal defects of mortise and tenon joint of wood structure Download PDFInfo
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- CN106839960A CN106839960A CN201710085363.3A CN201710085363A CN106839960A CN 106839960 A CN106839960 A CN 106839960A CN 201710085363 A CN201710085363 A CN 201710085363A CN 106839960 A CN106839960 A CN 106839960A
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- 239000002023 wood Substances 0.000 title claims abstract description 27
- 230000007547 defect Effects 0.000 title claims abstract description 16
- 238000000034 method Methods 0.000 title claims abstract description 12
- 238000009659 non-destructive testing Methods 0.000 title abstract description 5
- 239000000523 sample Substances 0.000 claims abstract description 47
- 238000001514 detection method Methods 0.000 claims abstract description 38
- 230000008859 change Effects 0.000 claims abstract description 20
- 241001074085 Scophthalmus aquosus Species 0.000 claims description 11
- 230000014759 maintenance of location Effects 0.000 claims description 9
- 230000036541 health Effects 0.000 claims description 3
- 230000008569 process Effects 0.000 claims description 3
- 230000003862 health status Effects 0.000 claims description 2
- 230000002950 deficient Effects 0.000 claims 1
- 230000009467 reduction Effects 0.000 abstract description 2
- 238000005553 drilling Methods 0.000 abstract 1
- 238000010276 construction Methods 0.000 description 4
- 230000006378 damage Effects 0.000 description 4
- 238000005259 measurement Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 241000256602 Isoptera Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009435 building construction Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000004035 construction material Substances 0.000 description 1
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- 238000011156 evaluation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000035772 mutation Effects 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000009418 renovation Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/46—Wood
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- Health & Medical Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Medicinal Chemistry (AREA)
- Food Science & Technology (AREA)
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- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Wood Science & Technology (AREA)
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a nondestructive testing method for the size and internal defects of a mortise and tenon joint of a wood structure. When the resistance value curve has obvious reduction of a local fracture mode, a gap or a defect exists at the passing position of the probe; when the resistance value curve has the change of the resistance value and is relatively continuous, the probe continuously passes through different woods or different grain directions of the same wood. The method can measure the size of the tenon mortise inside the tenon-and-mortise node by a micro-drilling resistance nondestructive detection method, and can judge whether the defects of tenon pulling, gaps, decay and the like exist inside the tenon-and-mortise node, thereby solving the problem that the tenon-and-mortise node with a wood structure is difficult to detect.
Description
Technical field
The present invention relates to a kind of for timber structure Tenon node size and the resistance dynamometer detection method of internal flaw, specifically relate to
And wood-structure old building, the detection of newly-built traditional timber buildings and reinforcing.
Background technology
Timber buildings are the conventional building construction forms of China, by years and the baptism of the flames of war, retain wood so far
Structural construction still has much, wherein being no lack of historical building and the landmark of preciousness.It is how scientific and reasonable to traditional timber structure
Build and detected, assess its structural behaviour, be the important prerequisite of traditional timber buildings Conservation and Renovation.
Tenon node is the structure position of most critical in traditional timber structure, and it is used for transferring structure and shears and moment of flexure, its
The quality of performance determines the structural behaviour quality of monolithic architecture.Due to the disguise of Tenon node, examined at Practical Project scene
In survey, the detection of Tenon node is often ignored, or only Tenon node external condition (packing, with the presence or absence of pull out tenon) etc. entered
Row detection, it is impossible to truly, be effectively estimated to Tenon node extant state and performance, and then have influence on to timber buildings
The accuracy of overall structure performance check and evaluation.
Lossless detection method is different from traditional detection method, and it stresses farthest preserved building original state, and to the greatest extent may be used
Can destruction of the ground reduction to tested wood component.For in-service timber buildings, how wooden construction material is not being destroyed in itself and former
Under the premise of structured, can with it is live effectively, quick, science, the defect detected exactly in in-service wood structures, it is determined that
Its residual intensity.A kind of Dynamic Non-Destruction Measurement of resistance dynamometer detection technique, is using micro drill point under motor-driven, with constant
Speed pierces wood internal and produces the size of comparative resistance to reflect the change of its density, and drill point is gathered in wood by microsystem
After the drag parameter produced in material and calculating, resistance curve image is shown.User is according to the resistance curve for showing and combines
Timber is gained knowledge and just can determine whether out early late wood's density, annual ring number, and wood internal is rotten, crack, damage by worms, the tool such as termite damage
Body situation.In continuous mode, it is the hole of 3mm or so that drill point need to only bore an aperture on timber.
The content of the invention
It is an object of the present invention to provide a kind of for timber structure Tenon node size and the lossless detection method of internal flaw, should
Method can measure the size at the Tenon intra-node tenon fourth of the twelve Earthly Branches mouthful, while also may be used by the method for micro- brill resistance Non-Destructive Testing
To judge that Tenon inside, with the presence or absence of the defect such as tenon, gap, rotten is pulled out, solves the difficulty that timber structure Tenon node is difficult to detect
Topic.
The technical solution adopted by the present invention is：A kind of Non-Destructive Testing for timber structure Tenon node size and internal flaw
Method, comprises the following steps：
First step, length of tenon angle detecting：
Determine position one in the outer surface of the pin of tested timber structure Tenon node, the alignment length of tenon direction of position one
Center, probe is pierced at position one using micro- brill resistance dynamometer along pin diametric(al) level, and probe is from pin band radial direction side
To entrance, tenon is pierced along the rift grain direction of tenon, the parallel tenon of probe palpus or the fourth of the twelve Earthly Branches mouthful are squeezed into, and driving depth must cover tenon；
Upper and lower being respectively perpendicular in position one is offset into 30mm~50mm, position two and position three is obtained, according to the side of step one
Method pierces probe again, repeatedly measures to reduce error；Probe is changed and resistance curve after piercing tenon by resistance amplitude
Waveform changes, and determines that probe changes starting point from pin surface up to contacting the resistance on tenon surface, so as to calculate tenon
Length L=D-Sac；Wherein D is pin diameter, SacIt is Resistance Value starting point a to the distance of Resistance Value change point c；
Second step, the detection of tenon width：
Determine position four, position five, position six, position seven in the outer surface of the pin of tested timber structure Tenon node；Position
Put four, position five, position six, the side of the correspondence tenon of position seven, and be on a horizontal linear, adjacent spacing be 30mm~
50mm, probe is pierced at position four, position five, position six, position seven using micro- brill resistance dynamometer along pin diametric(al) level,
Probe is pierced perpendicular to tenon, pierce order for pin band radial direction-tenon band it is tangential-pin band radially, according to resistance
The change of the amplitude and waveform of power, calculates the width B=S of tenonde, SdeIt is Resistance Value change point d to Resistance Value change point e
Distance；
Third step, the detection of tenon short transverse：
Position eight is determined at timber structure Tenon node under beam on the pin outer surface in face being tested, using micro- brill resistance dynamometer
Pierce probe along with the angled α directions of pin, pierce order for pin twill-tenon bottom surface twill-tenon topside diagonals-
Pin twill, angle [alpha] is as less than normal as possible, enables to probe up and down through tenon, can calculate tenon height dimension, and Tenon is high
Degree H=Sfg× cos α, SfgIt is probe from tenon lower surface to the distance of tenon upper surface；
Four steps, resistance dynamometer determining defects：
The entrance process of resistance dynamometer detection curve and probe synchronously carry out, height and the tendency of resistance dynamometer detected value are reacted
The health status of wooden component.Resistance dynamometer detected value is higher in resistance dynamometer detection curve, early late wood (shows as trough and ripple in curve
Peak) difference is significantly healthy area, it is scarce that resistance dynamometer detected value is relatively low in resistance dynamometer detection curve, early late wood's difference diminishes
Fall into region.Resistance Value retention rate=rejected region resistance dynamometer detected value/health position resistance dynamometer detected value × 100%, calculates
Resistance Value retention rate<30% position determines gap or cavity position, and early late wood's change not can recognize that in Resistance Value curve；Work as resistance
Force value retention rate determines rotten position in 30%~70% position, the resistance dynamometer detection in resistance dynamometer curve corresponding to early late wood
Value difference mutation is small.
The know-why that the present invention is used is the change of Resistance Value when piercing intra-node by the probe of resistance dynamometer, according to
Different Resistance Value curve maps, carry out the differentiation of the measure and internal flaw of Tenon node size.When Resistance Value curve exist it is bright
The decline of aobvious local fracture formula, represents that probe has gap or defect by place；When Resistance Value curve occurs Resistance Value
Change and relatively more continuous, represent that probe continues to pass through different timber or the different grain directions of same timber.
Detection method present invention relates particularly to be based on resistance dynamometer Non-Destructive Testing Tenon node size and internal flaw, overcomes
Traditional detection method limitation, more stresses farthest preserved building original state, and be reduced as far as to tested wood component
Destruction.For in-service timber buildings, the detection method can with it is live effectively, quick, science, detect in-service wood exactly
Defect in structural elements.The foundation for providing reference can be safeguarded and repaired to the result for evaluating for timber buildings.
Beneficial effect：Detection method of the invention, is not limited to by existing detection method dismounting, can be straight on original structure
Operation is connect, can not only be without detection under collapse state, and the reliable essence of detection data for different type timber structure Tenon node
Really.Construction aspect is economical and practical, reduces the construction workload at scene, and easy construction is simple, is used in historical building, ancient building
With wide reinforcement application prospect.
Brief description of the drawings
Fig. 1 a are Tenon node defects detection top view；
Fig. 1 b are Tenon node defects detection side view one；
Fig. 1 c are Tenon node defects detection side view two；
Fig. 2 is length of tenon direction Resistance Value curve；
Fig. 3 is tenon width Resistance Value curve；
Fig. 4 is tenon short transverse Resistance Value curve.
Specific embodiment
The present invention is further illustrated with reference to the accompanying drawings and detailed description.
It is a kind of for timber structure Tenon node size and the lossless detection method of internal flaw as shown in Fig. 1 a-Fig. 1 c,
Comprise the following steps：
First step, length of tenon angle detecting：
Determine position 1, the alignment length of tenon direction of position 1 in the outer surface of the pin of tested timber structure Tenon node
Center, probe is pierced along pin diametric(al) level using micro- brill resistance dynamometer at position 1, probe from pin band radially
Direction enters, and tenon is pierced along the rift grain direction of tenon, and the parallel tenon of probe palpus or the fourth of the twelve Earthly Branches mouthful are squeezed into, and driving depth must cover tenon
Head；
Upper and lower being respectively perpendicular in position 1 is offset into 30mm~50mm, position 22 and position 31 is obtained, according to step one
Method pierce probe again, repeatedly measurement is reducing error；Probe is changed and resistance after piercing tenon by resistance amplitude
Curve waveform changes, and determines that probe changes starting point from pin surface up to contacting the resistance on tenon surface, so as to calculate
The length L=D-S of tenonac；Wherein D is pin diameter, SacIt is Resistance Value starting point a to the distance of Resistance Value change point c.
As shown in Fig. 2 for Tenon node along tenon longitudinal resistance instrument curve, probe is pierced along timber band direction, due to
Timber morning late wood's density variation, the waveforms amplitude of Resistance Value curve 9 fluctuation is larger；During by curve 10, Resistance Value has under detail
Drop, represents there is gap at this；Arrival curve 11, the average value of Resistance Value is of a relatively high and fluctuation is small, represents that probe has been drilled into tenon
Head.
Second step, the detection of tenon width：
Determine position 44, position 55, position 66, position seven in the outer surface of the pin of tested timber structure Tenon node
7；Position 44, position 55, position 66, the side of the correspondence tenon of position 77, and be on a horizontal linear, adjacent spacing
It is 30mm~50mm, using micro- brill resistance dynamometer along pin diametric(al) at position 44, position 55, position 66, position 77
Level pierces probe, and probe is pierced perpendicular to tenon, pierce order for pin band radial direction-tenon band it is tangential-pin horizontal stroke
Radially, the change of amplitude and waveform according to resistance calculates the width B=S of tenon to linede, SdeFor Resistance Value change point d extremely
The distance of Resistance Value change point e, as shown in Figure 3.
Third step, the detection of tenon short transverse：
Position 88 is determined at timber structure Tenon node under beam on the pin outer surface in face being tested, using micro- brill resistance
Instrument pierces probe along with the angled α directions of pin, pierces order for pin twill-tenon bottom surface twill-tenon top surface is oblique
Line-pin twill, angle [alpha] is as less than normal as possible, enables to probe up and down through tenon, can calculate tenon height dimension, tenon
Fourth of the twelve Earthly Branches height H=Sfg× cos α, SfgIt is probe from tenon lower surface to the distance of tenon upper surface, as shown in Figure 4.
Four steps, resistance dynamometer determining defects：
The entrance process of resistance dynamometer detection curve and probe synchronously carry out, such as the abscissa of Fig. 2 curve maps is that probe enters
The depth of timber, ordinate is resistance dynamometer detected value, and height and the tendency of resistance dynamometer detected value have reacted the healthy shape of wooden component
Condition.Resistance dynamometer detected value is higher in resistance dynamometer detection curve, early late wood's (trough and crest are shown as in curve) difference is obvious
It is healthy area, it is defect area that resistance dynamometer detected value is relatively low in resistance dynamometer detection curve, early late wood's difference diminishes.Resistance Value
Retention rate=rejected region resistance dynamometer detected value/health position resistance dynamometer detected value × 100%, calculates Resistance Value retention rate<
30% position determines gap or cavity position, and early late wood's change not can recognize that in Resistance Value curve；When Resistance Value retention rate exists
30%~70% position determines rotten position, and the resistance dynamometer detected value difference in resistance dynamometer curve corresponding to early late wood diminishes.
Probe device head is placed on predetermined position by the present invention, closely reliably contacts the surface of tested wood component, is opened
Power supply is opened, access switch is pinned, after motor starting, equipment is started working, and equipment is tightly held with hand-tight, is given certain pressure
Power；After probe pierces out test specimen, pin and exit switch, when probe exits wooden component completely, be back to original position, printer number
After being finished according to output, power supply is closed.After the completion of micro- brill resistance test, measured data are imported into computer carries out data point
Analysis.By instrument from tape cable, battery pack is connected on the computer equipped with Instrumental Analysis software, opens battery switch, choosing
Selecting corresponding button carries out the importing of data.
Embodiments of the present invention are described in detail above in association with accompanying drawing, but the present invention is not limited to described reality
Apply mode.For one of ordinary skill in the art, in the range of principle of the invention and technological thought, to these implementations
Mode carries out various changes, modification, replacement and deformation and still falls within protection scope of the present invention.
Claims (1)
1. a kind of for timber structure Tenon node size and the lossless detection method of internal flaw, it is characterised in that：Including following
Step：
First step, length of tenon angle detecting：
Position one is determined in the outer surface of the pin of tested timber structure Tenon node, in the alignment length of tenon direction of position one
The heart, probe is pierced at position one using micro- brill resistance dynamometer along pin diametric(al) level, and probe is from pin band radial direction
Into, tenon is pierced along the rift grain direction of tenon, the parallel tenon of probe palpus or the fourth of the twelve Earthly Branches mouthful are squeezed into, and driving depth must cover tenon；
Upper and lower being respectively perpendicular in position one is offset into 30mm~50mm, position two and position three is obtained, according to the method weight of step one
Probe newly is pierced, repeatedly measures to reduce error；Probe is changed and resistance curve waveform after piercing tenon by resistance amplitude
Change, determines that probe changes starting point from pin surface up to contacting the resistance on tenon surface, so as to calculate the length of tenon
Degree L=D-Sac；Wherein D is pin diameter, SacIt is Resistance Value starting point a to the distance of Resistance Value change point c；
Second step, the detection of tenon width：
Determine position four, position five, position six, position seven in the outer surface of the pin of tested timber structure Tenon node；Position four,
Position five, position six, the side of the correspondence tenon of position seven, and be on a horizontal linear, adjacent spacing is 30mm~50mm,
Probe, probe are pierced along pin diametric(al) level using micro- brill resistance dynamometer at position four, position five, position six, position seven
Pierced perpendicular to tenon, pierce order for pin band radial direction-tenon band it is tangential-pin band radially, according to resistance
The change of amplitude and waveform, calculates the width B=S of tenonde, SdeFor Resistance Value change point d to Resistance Value change point e away from
From；
Third step, the detection of tenon short transverse：
Determine position eight on the pin outer surface in face under the beam at tested timber structure Tenon node, using micro- brill resistance dynamometer along with
The angled α directions of pin pierce probe, pierce order for pin twill-tenon bottom surface twill-tenon topside diagonals-pin
Twill so that probe runs through tenon up and down, calculates tenon height dimension, Tenon height H=Sfg× cos α, SfgFor probe from
Tenon lower surface to tenon upper surface distance；
Four steps, resistance dynamometer determining defects：
The entrance process of resistance dynamometer detection curve and probe synchronously carry out, height and the tendency of resistance dynamometer detected value have reacted wooden structure
The health status of part；Resistance dynamometer detected value is higher in resistance dynamometer detection curve, early late wood's difference is significantly healthy area, resistance
It is defect area that resistance dynamometer detected value is relatively low in instrument detection curve, early late wood's difference diminishes；Resistance Value retention rate=defective part
Position resistance dynamometer detected value/health position resistance dynamometer detected value × 100%, calculates Resistance Value retention rate<30% position determines
Gap or cavity position, early late wood's change not can recognize that in Resistance Value curve；When position of the Resistance Value retention rate 30%~70%
The rotten position of determination is put, the resistance dynamometer detected value difference in resistance dynamometer curve corresponding to early late wood diminishes.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710085363.3A CN106839960A (en) | 2017-02-17 | 2017-02-17 | Nondestructive testing method for size and internal defects of mortise and tenon joint of wood structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710085363.3A CN106839960A (en) | 2017-02-17 | 2017-02-17 | Nondestructive testing method for size and internal defects of mortise and tenon joint of wood structure |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111272821A (en) * | 2020-03-11 | 2020-06-12 | 上海市建筑科学研究院有限公司 | Method for detecting internal defect and micro-damage of wood |
| CN113203373A (en) * | 2021-04-07 | 2021-08-03 | 同济大学 | Method for detecting internal size of mortise and tenon joint based on ultrasonic waves |
| CN114459312A (en) * | 2022-04-14 | 2022-05-10 | 徐州恒林木业有限公司 | Size detection device after wood processing |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101609085A (en) * | 2009-07-24 | 2009-12-23 | 中国林业科学研究院木材工业研究所 | A kind of quick resistance detection method of internal structure of wood pillar of historic building |
| CN101639428A (en) * | 2009-07-24 | 2010-02-03 | 中国林业科学研究院木材工业研究所 | Rapid resistance detection method of elastic modulus of timber component in historic building timber structure |
| CN101986150A (en) * | 2010-10-14 | 2011-03-16 | 中国林业科学研究院木材工业研究所 | Method for detecting internal defects of ancient building wood member by using stress wave and resistance instrument together |
| CN104849350A (en) * | 2015-05-13 | 2015-08-19 | 浙江农林大学 | Method for identifying and classifying wood defects based on multiple features |
-
2017
- 2017-02-17 CN CN201710085363.3A patent/CN106839960A/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101609085A (en) * | 2009-07-24 | 2009-12-23 | 中国林业科学研究院木材工业研究所 | A kind of quick resistance detection method of internal structure of wood pillar of historic building |
| CN101639428A (en) * | 2009-07-24 | 2010-02-03 | 中国林业科学研究院木材工业研究所 | Rapid resistance detection method of elastic modulus of timber component in historic building timber structure |
| CN101986150A (en) * | 2010-10-14 | 2011-03-16 | 中国林业科学研究院木材工业研究所 | Method for detecting internal defects of ancient building wood member by using stress wave and resistance instrument together |
| CN104849350A (en) * | 2015-05-13 | 2015-08-19 | 浙江农林大学 | Method for identifying and classifying wood defects based on multiple features |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111272821A (en) * | 2020-03-11 | 2020-06-12 | 上海市建筑科学研究院有限公司 | Method for detecting internal defect and micro-damage of wood |
| CN113203373A (en) * | 2021-04-07 | 2021-08-03 | 同济大学 | Method for detecting internal size of mortise and tenon joint based on ultrasonic waves |
| CN114459312A (en) * | 2022-04-14 | 2022-05-10 | 徐州恒林木业有限公司 | Size detection device after wood processing |
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Application publication date: 20170613 |
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