CN104264722B - Become bridge Nondestructive Pile-inspection Methods - Google Patents
Become bridge Nondestructive Pile-inspection Methods Download PDFInfo
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- CN104264722B CN104264722B CN201410520960.0A CN201410520960A CN104264722B CN 104264722 B CN104264722 B CN 104264722B CN 201410520960 A CN201410520960 A CN 201410520960A CN 104264722 B CN104264722 B CN 104264722B
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- 230000007547 defect Effects 0.000 claims abstract description 41
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- 238000009659 non-destructive testing Methods 0.000 claims description 4
- 230000002787 reinforcement Effects 0.000 abstract description 4
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- 238000012372 quality testing Methods 0.000 abstract description 2
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Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/02—Piers; Abutments ; Protecting same against drifting ice
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
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Abstract
The present invention provides a kind of one-tenth bridge Nondestructive Pile-inspection Methods, arranges cymoscope at bridge pier on the survey line on ground, and, on the survey line being positioned at above cymoscope, it is sequentially arranged multiple shot point at equal intervals；For each shot point, all obtain an oscillogram, thus obtain multiple oscillogram；Then, setting up rectangular coordinate system, wherein, abscissa is the time, and vertical coordinate is oscillogram numbering, multiple oscillograms being represented, this rectangular coordinate is fastened, obtains the oscillogram group corresponding with described survey line；Described oscillogram group is analyzed, obtains the defect analysis result of the foundation pile located below ground level in described one-tenth bridge pier base.Can be on the premise of not destroying existing structure, quality testing is carried out to becoming abutment stake, especially can fast and effectively the peak that the peak that defective locations produces produces with up echo be separated, reaching to be accurately positioned the purpose of the pile defect position located below ground level, the reinforcement and repair for bridge provides important evidence.
Description
Technical field
The invention belongs to pile foundation detection field, be specifically related to a kind of one-tenth bridge Nondestructive Pile-inspection Methods.
Background technology
Currently, along with national economy and the fast development of communication, in China's existing highway bridge quite a few
Owing to earthquake, flood etc. affect, and owing to Earlier designs load standard is on the low side, occur in that in various degree
Pile foundation damages the even problem such as broken pile, and greatly have impact on it normally uses, and the old bridge of part already at
Unsafe bridge state.Therefore, to becoming abutment stake to detect, effectively differentiate the defective locations of foundation pile and bad shape
Condition, is the important prerequisite that bridge carries out reinforcement and repair.
As it is shown in figure 1, be the structural representation sketch of existing highway bridge, including foundation pile 11, bridge pier 12 and bent cap
2；Wherein, labelling 3 represents ground, and as seen from Figure 1, foundation pile refers to the part that locates below ground level.It is positioned at
Referred to as bridge pier more than ground；Therefore, for bridge pier, owing to it is positioned at more than ground, therefore, meat is passed through
Eye is observed or by measuring and the method such as detection equipment, very convenient detects its quality, and for position
In the foundation pile of below ground, owing to it locates below ground level, naked eyes cannot directly be observed, therefore, to its matter
Amount carries out detecting the difficult point belonging to prior art.
In prior art, lossless detection method based on vibration can be used, as it is shown in figure 1, in certain of bridge
A cymoscope 4 and a shot point 5 is arranged on axial survey line；Then, shot point 5 is made to excite and produce many
Road vibration wave, if the moment being excited from shot point 5, cymoscope 4 starts timing, then: such as Fig. 2 institute
Showing, there is 1 defect in the foundation pile if located in below ground, i.e. the Z location of Fig. 2, then after shot point 5 excites
At least producing 3 road vibration waves, first via vibration wave is direct wave L1, and its propagation path is: go out from shot point 5
After sending out, straightline propagation is to cymoscope 4, it may be assumed that propagation distance is the shot point air line distance to cymoscope, and this is straight
Linear distance is designated as M1, therefore, cymoscope at T1=M1/c reception to this direct wave；Wherein, c is vibration
Ripple is in the spread speed within pile foundation；
Second road vibration wave is referred to as upgoing wave L2, and its propagation path is: upwardly propagate to bent cap from shot point,
Cymoscope is traveled to again, it may be assumed that propagation distance is shot point to the air line distance of bent cap and lid after being reflected by bent cap
Beam is to the air line distance sum of cymoscope；This air line distance is designated as M2, and therefore, cymoscope is at T2=M2/c
Reception is to this upgoing wave；
3rd road vibration wave is referred to as down going wave, is divided into two kinds: (1) the first be down going wave L3, propagation path
For: from shot point 5 travel downward at the bottom of the stake of foundation pile, after pile bottom reflection, traveled to cymoscope again, it may be assumed that pass
Broadcast distance for arriving the air line distance sum of cymoscope at the bottom of shot point to the air line distance at the bottom of stake and stake, by this straight line
Distance is designated as M3, therefore, cymoscope at T3=M3/c reception to this down going wave；(2) under the second is
Row ripple L4, propagation path is: propagates to defective locations from shot point, travels to after being reflected by defective locations again
Cymoscope, it may be assumed that propagation distance is shot point arrives cymoscope to the air line distance of defective locations with defective locations
Air line distance sum, is designated as M4 by this air line distance, therefore, cymoscope T4=M4/c reception to should
Down going wave.
Therefore, defective locations produce peak do not exist overlapping with other known peaks, it may be assumed that if M4 ≠ M2 and
, then should there is the oscillogram shown in Fig. 3 in M4 ≠ M1, then T4 ≠ T2 and T4 ≠ T1, for Fig. 3, due to T1,
T2 and T3 is fixed value, therefore, by T1, T2 and T3 position occur obvious peak get rid of after, remaining substantially
Peak is the peak that defective locations produces, and thus finds T4, re-uses formula M4=c*T4, i.e. obtain M4 value,
Then, owing to the spacing of cymoscope 4 and shot point 5 is it is known that thus can get defective locations distance ground
Distance, the defect point i.e. navigated to.
But, the subject matter that above-mentioned quality determining method exists is:
The defective locations of the foundation pile owing to locating below ground level is not fixed, therefore, when situation M4=M2 occur
Time, then T4=T2, therefore, obtaining the oscillogram shown in Fig. 4, if using above-mentioned detection method, inciting somebody to action
After the obvious peak that T1, T2 and T3 position occurs is got rid of, oscillogram do not exists other obvious peaks, therefore,
Draw the conclusion of the foundation pile located below ground level not existing defects, it is clear that this kind of test result is wrong.
Visible, existing Nondestructive Pile-inspection Methods has certain use limitation, it is impossible to be applicable to defect peak and lid
The peak that the upgoing wave that beam reflects to form produces or the situation of the peak overlapping with direct wave generation.
Summary of the invention
The defect existed for prior art, the present invention provides a kind of one-tenth bridge Nondestructive Pile-inspection Methods, can have
Effect solves the problems referred to above.
The technical solution used in the present invention is as follows:
The present invention provides a kind of one-tenth bridge Nondestructive Pile-inspection Methods, and described one-tenth bridge Nondestructive Pile-inspection Methods is used for
Detect into the pile quality located below ground level after bridge；Wherein, described Cheng Qiao includes foundation pile, is positioned at described base
Stake stake top above bridge pier and be positioned at the bent cap above described bridge pier；
Described one-tenth bridge Nondestructive Pile-inspection Methods comprises the following steps:
S1, the most arbitrarily chooses survey line at bridge pier；
S2, near ground configuration cymoscope on the described survey line of bridge pier, and, it is being positioned at described cymoscope
On the described survey line of top, it is sequentially arranged shot point J1, shot point J2, shot point Ji at equal intervals ... shot point
Jn；Wherein, n >=2；
S3, makes shot point J1 be excited, and shot point J1 produces at least three road vibration waves simultaneously after being excited；
Wherein, first via vibration wave is referred to as direct wave, and its propagation path is: straight line after shot point J1
Travel to cymoscope, it may be assumed that propagation distance is the shot point J1 air line distance to cymoscope；
Second road vibration wave is referred to as upgoing wave, and its propagation path is: upwardly propagate to bent cap from shot point J1,
Travel to cymoscope after being reflected by bent cap again, it may be assumed that propagation distance be shot point J1 to bent cap air line distance with
Bent cap is to the air line distance sum of cymoscope；
3rd road vibration wave is referred to as down going wave, is divided into two kinds, and the first propagation path is: from shot point J1 to
Under propagate to, at the bottom of the stake of foundation pile, be traveled to cymoscope after pile bottom reflection again, it may be assumed that propagation distance is shot point
J1 is to the air line distance sum arriving cymoscope at the bottom of the air line distance at the bottom of stake and stake；The second propagation path is: from
Shot point J1 propagates to defective locations, travels to cymoscope again, it may be assumed that propagation distance after being reflected by defective locations
For air line distance and the defective locations of shot point J1 to defective locations to the air line distance sum of cymoscope；
S4, described cymoscope is set the timeorigin starting timing by preset rules, then, with the time as horizontal stroke
Coordinate, with the vibration wave amplitude received by cymoscope as vertical coordinate, obtains 1st corresponding with shot point J1
Oscillogram；
S5, then, makes shot point J2 be excited, and shot point J2 produces at least three road vibration waves after being excited；
Described cymoscope is set the timeorigin starting timing by described preset rules, then, with the time as abscissa,
With the vibration wave amplitude received by cymoscope as vertical coordinate, obtain 2nd oscillogram corresponding with shot point J2；
The rest may be inferred, makes shot point 3 the most respectively ... shot point Jn is excited, and respectively obtains and shot point 3
The 3rd corresponding oscillogram ... n-th oscillogram corresponding with shot point Jn；
Thus there are n oscillogram, this n oscillogram has identical timeorigin；
S6, sets up rectangular coordinate system, and wherein, abscissa is the time, and vertical coordinate is oscillogram numbering, by n
Individual oscillogram represents that this rectangular coordinate is fastened, and obtains the oscillogram group corresponding with described survey line；To described ripple
The travel time curve slope of shape figure group is analyzed, the foundation pile obtaining locating below ground level in described one-tenth bridge pier base
Defect analysis result.
Preferably, in S2, it is positioned on the described survey line above described cymoscope, at equal intervals by the most suitable
Sequence or be sequentially arranged shot point J1, shot point J2, shot point Ji by sequence from low to uper part ... shot point Jn.
Preferably, in S4, described preset rules refers to:
After the shot point being arranged in described survey line is triggered, it is arranged in the cymoscope of this survey line from receiving
Timing is started from 0 during vibration wave.
Preferably, in S6, described oscillogram group is analyzed, obtains described one-tenth bridge pier base is positioned at ground
The defect analysis result of following foundation pile, specifically includes following steps:
S6.1, for oscillogram i corresponding with shot point Ji, in conjunction with the preset rules of beginning timing, then to shake
Dynamic ripple spread speed c in pile foundation is given value, with cymoscope the distance distance on ground, this shot point i
At the bottom of the distance distance on ground, the distance of bent cap to ground and stake, the distance on distance ground is given value, meter
Calculate and obtain that direct wave is detected time point ti-1 that ripple detects, bent cap echo is detected the time that ripple detects
Point ti-2 and reflection wave at the bottom of pile are detected the time point ti-3 that ripple detects；
By t1-1, t2-1 in described oscillogram group ... tn-1 is linked in sequence and obtains straight line Z1, its slope is H1；
By t1-2, t2-2 in described oscillogram group ... tn-2 is linked in sequence and obtains straight line Z2；Its slope is H2；
By t1-3, t2-3 in described oscillogram group ... tn-3 is linked in sequence and obtains straight line Z3；Its slope is H3；
S6.2, then, for any one oscillogram i, it is judged that whether oscillogram i exists except time point ti-1,
Obvious crest outside ti-2 and ti-3 position or substantially trough, if it has, all emphasis mark this obvious crest or
Substantially trough；
Then, use different connected modes, by the obvious crest of each oscillogram or substantially trough is in order
Connect, obtain a plurality of straight line；And determine whether to be connected in the straight line obtained, if there is slope is also
The straight line of H3, if it has, this straight line is designated as Z4, then obtains what straight line Z4 intersected with each oscillogram
Abscissa value, i.e. time value, then with this time value as given value, extrapolate the defect corresponding to this time value
Position, this defective locations is in described one-tenth bridge pier base the defect analysis result of the foundation pile located below ground level.
Preferably, after S6, also include:
S7, other axial locations at bridge pier choose N bar survey line, for each selected survey line, all
The method using S2-S6, carries out Non-Destructive Testing to selected survey line；Therefore, for each survey line,
All obtain the defect analysis result of the foundation pile located below ground level in described one-tenth bridge pier base；Thus there are N+1
Individual defect analysis result, this described N+1 defect analysis result is mutually authenticated, thus obtains described one-tenth bridge pier
The final defect analysis result of the foundation pile located below ground level in base.
Beneficial effects of the present invention is as follows:
The present invention provides a kind of one-tenth bridge Nondestructive Pile-inspection Methods, can be right on the premise of not destroying existing structure
Abutment stake is become to carry out quality testing, the peak that especially can be produced by defective locations fast and effectively and up echo
The peak produced separates, and reaches to be accurately positioned the purpose of the pile defect position located below ground level, can extensively answer
The impaired assessment of foundation pile, old bridge pile detection etc. after earthquake disaster, the reinforcement and repair for bridge provides important depending on
According to.
Accompanying drawing explanation
The structural representation sketch of the existing highway bridge that Fig. 1 provides for prior art；
Fig. 2 is the structural representation that Fig. 1 increases the vibration wave direction of propagation；
The method that Fig. 3 provides for using prior art carries out detecting a kind of oscillogram obtained；
The method that Fig. 4 provides for using prior art carries out detecting the another kind of oscillogram obtained；
The layout schematic diagram becoming bridge Nondestructive Pile-inspection Methods to be used that Fig. 5 provides by the present invention；
Fig. 6 is the schematic diagram of the oscillogram group that example two of the present invention obtains；
Fig. 7 is the schematic diagram of a kind of oscillogram group that the embodiment of the present invention obtains；
Fig. 8 is the schematic diagram of the another kind of oscillogram group that the embodiment of the present invention obtains.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is described in detail:
As it is shown in figure 5, the present invention provides a kind of one-tenth bridge Nondestructive Pile-inspection Methods, described one-tenth abutment stake is lossless
The detection method pile quality located below ground level after detecting into bridge；Wherein, described Cheng Qiao includes base
Stake, be positioned at the bridge pier above described Under Pile top and be positioned at the bent cap above described bridge pier；
Described one-tenth bridge Nondestructive Pile-inspection Methods comprises the following steps:
S1, the most arbitrarily chooses survey line at bridge pier；
S2, near ground configuration cymoscope on the described survey line of bridge pier, and, it is being positioned at described cymoscope
On the described survey line of top, it is sequentially arranged shot point J1, shot point J2, shot point Ji at equal intervals ... shot point
Jn；Wherein, n >=2；
In this step, shot point J1, shot point J2, shot point Ji ... shot point Jn can be by order from top to bottom
Or press sequence from low to uper part layout.
S3, makes shot point J1 be excited, and shot point J1 produces at least three road vibration waves simultaneously after being excited；
Wherein, first via vibration wave is referred to as direct wave, and its propagation path is: straight line after shot point J1
Travel to cymoscope, it may be assumed that propagation distance is the shot point J1 air line distance to cymoscope；
Second road vibration wave is referred to as upgoing wave, and its propagation path is: upwardly propagate to bent cap from shot point J1,
Travel to cymoscope after being reflected by bent cap again, it may be assumed that propagation distance be shot point J1 to bent cap air line distance with
Bent cap is to the air line distance sum of cymoscope；
3rd road vibration wave is referred to as down going wave, is divided into two kinds, and the first propagation path is: from shot point J1 to
Under propagate to, at the bottom of the stake of foundation pile, be traveled to cymoscope after pile bottom reflection again, it may be assumed that propagation distance is shot point
J1 is to the air line distance sum arriving cymoscope at the bottom of the air line distance at the bottom of stake and stake；The second propagation path is: from
Shot point J1 propagates to defective locations, travels to cymoscope again, it may be assumed that propagation distance after being reflected by defective locations
For air line distance and the defective locations of shot point J1 to defective locations to the air line distance sum of cymoscope；
S4, described cymoscope is set the timeorigin starting timing by preset rules, then, with the time as horizontal stroke
Coordinate, with the vibration wave amplitude received by cymoscope as vertical coordinate, obtains 1st corresponding with shot point J1
Oscillogram；
In this step, the preset rules for timing refers to: whenever the shot point being arranged in described survey line is touched
After Faing, the cymoscope being arranged in this survey line starts timing from 0 in time receiving vibration wave.
S5, then, makes shot point J2 be excited, and shot point J2 produces at least three road vibration waves after being excited；
Described cymoscope is set the timeorigin starting timing by described preset rules, then, with the time as abscissa,
With the vibration wave amplitude received by cymoscope as vertical coordinate, obtain 2nd oscillogram corresponding with shot point J2；
The rest may be inferred, makes shot point 3 the most respectively ... shot point Jn is excited, and respectively obtains and shot point 3
The 3rd corresponding oscillogram ... n-th oscillogram corresponding with shot point Jn；
Thus there are n oscillogram, this n oscillogram has identical timeorigin；
S6, sets up rectangular coordinate system, and wherein, abscissa is the time, and vertical coordinate is oscillogram numbering, by n
Individual oscillogram represents that this rectangular coordinate is fastened, and obtains the oscillogram group corresponding with described survey line；To described ripple
The travel time curve slope of shape figure group is analyzed, the foundation pile obtaining locating below ground level in described one-tenth bridge pier base
Defect analysis result.
Described oscillogram group is analyzed, lacking of the foundation pile obtaining locating below ground level in described one-tenth bridge pier base
Fall into analysis result, specifically include following steps:
S6.1, for oscillogram i corresponding with shot point Ji, in conjunction with the preset rules of beginning timing, then to shake
Dynamic ripple spread speed c in pile foundation is given value, with cymoscope the distance distance on ground, this shot point i
At the bottom of the distance distance on ground, the distance of bent cap to ground and stake, the distance on distance ground is given value, meter
Calculate and obtain that direct wave is detected time point ti-1 that ripple detects, bent cap echo is detected the time that ripple detects
Point ti-2 and reflection wave at the bottom of pile are detected the time point ti-3 that ripple detects；
By t1-1, t2-1 in described oscillogram group ... tn-1 is linked in sequence and obtains straight line Z1, its slope is H1；
By t1-2, t2-2 in described oscillogram group ... tn-2 is linked in sequence and obtains straight line Z2；Its slope is H2；
By t1-3, t2-3 in described oscillogram group ... tn-3 is linked in sequence and obtains straight line Z3；Its slope is H3；
S6.2, then, for any one oscillogram i, it is judged that whether oscillogram i exists except time point ti-1,
Obvious crest outside ti-2 and ti-3 position or substantially trough, if it has, all emphasis mark this obvious crest or
Substantially trough；
Then, use different connected modes, by the obvious crest of each oscillogram or substantially trough is in order
Connect, obtain a plurality of straight line；And determine whether to be connected in the straight line obtained, if there is slope is also
The straight line of H3, if it has, this straight line is designated as Z4, then obtains what straight line Z4 intersected with each oscillogram
Abscissa value, i.e. time value, then with this time value as given value, extrapolate the defect corresponding to this time value
Position, this defective locations is in described one-tenth bridge pier base the defect analysis result of the foundation pile located below ground level.
For when use a shot point, defective locations down going wave echo exist with upgoing wave echo overlapping cannot
Situation about distinguishing, owing to the present invention is disposed with multiple shot point, and, each shot point distance cymoscope
Distance all differs, in thus obtained oscillogram group, by above to oscillogram group travel time curve slope
Analyze, reach to filter the purpose of upgoing wave echo, the foundation pile that can be pin-pointed to locate below ground level
Defective locations.
In the present invention, cymoscope includes a kind of situation for the preset rules of timing: whenever being arranged in described survey
After the shot point of line is triggered, the cymoscope being arranged in this survey line starts timing from 0 in time receiving vibration wave.
It is exemplified below concrete example:
Example one
The present embodiment uses: after certain shot point being arranged in survey line is triggered, be arranged in this survey line
Cymoscope in time receiving vibration wave from 0 start timing timing mode:
I.e. obtain the oscillogram group shown in Fig. 6, wherein, due to the present embodiment timing mode, therefore,
There is not time difference in direct wave produced by each shot point and down going wave echo, will not produce offset distance, its
When walking, line is vertical line；And upgoing wave echo propagation distance reduces 0.5m successively, therefore when it is walked, line is oblique
Line.Owing to the purpose of the present invention is the foundation pile that locates below ground level of detection whether existing defects, and it is positioned at ground
Following foundation pile, if there is defect, can produce down going wave echo, therefore, in Fig. 6, it is only necessary to
Search whether to exist in addition to Z1 and Z3, remain as the Z4 of vertical line, if there is Z4, then obtain straight line
The abscissa value that Z4 intersects with each oscillogram, i.e. time value, then with this time value as given value, can be quick
Extrapolate the defective locations corresponding to this time value.
After S6, also include:
S7, other axial locations at bridge pier choose N bar survey line, for each selected survey line, all
The method using S2-S6, carries out Non-Destructive Testing to selected survey line；Therefore, for each survey line,
All obtain the defect analysis result of the foundation pile located below ground level in described one-tenth bridge pier base；Thus there are N+1
Individual defect analysis result, this described N+1 defect analysis result is mutually authenticated, thus obtains described one-tenth bridge pier
The final defect analysis result of the foundation pile located below ground level in base.Wherein, each bar survey line is carried out defect inspection
During survey, on same survey line, the interval between adjacent shot point is identical or differs；Described cymoscope starts
The described preset rules of timing is identical or differs.
Embodiment
As a example by certain highway Cheng Qiao.The foundation pile located below ground level for old bridge, Cheng Qiao, due to it
Being connected with superstructure, its pile body integrity cannot use low strain dynamic bounce technique and the sound wave transmission method of routine
Test.For case above, the applicant have employed the one-tenth abutment stake Non-Destructive Testing side that the present invention provides
Method, has carried out VSP peg and has tested this one-tenth bridge 1# foundation pile:
For No. 1 stake, cymoscope is arranged on the bridge pier at earth's surface, and each arrangement of measuring-line 12 excites
Point, first shot point is away from cymoscope 0.5m, adjacent shot point spacing 0.5m.Timing rule is: Mei Dangbu
Being placed in after the shot point of survey line is triggered, the cymoscope being arranged in this survey line is opened from 0 in time receiving vibration wave
Beginning timing, obtains the oscillogram group shown in Fig. 7.In the figure 7, it is divided into analysis and draws three vertical lines, respectively
For vertical line A1, vertical line A2 and vertical line A3, represent the line of downgoing reflection ripple；Then: vertical line can be deduced
A3 is the line of foundation pile reflection wave at the bottom of pile；The foundation pile that vertical line A1 and vertical line A2 respectively locates below ground level
Defective locations echo；Vertical line A1 is calculated further, thus it is speculated that go out, at below ground 12 meters, there is broken pile
Or defect；Vertical line A2 is calculated further, thus it is speculated that go out, at below ground 26.5 meters, there is broken pile or defect.
For No. 2 stakes, cymoscope is arranged on the bridge pier at earth's surface, and each arrangement of measuring-line 12 excites
Point, first shot point is away from cymoscope 0.5m, adjacent shot point spacing 0.5m.Timing rule is: Mei Dangbu
Being placed in after the shot point of survey line is triggered, the cymoscope being arranged in this survey line is opened from 0 in time receiving vibration wave
Beginning timing, obtains the oscillogram group shown in Fig. 8.
In fig. 8, it is divided into analysis and draws two vertical lines, respectively vertical line A4 and vertical line A5, represent descending
The line of echo；Then: the line that vertical line A5 is foundation pile reflection wave at the bottom of pile can be deduced；Vertical line A4 is position
Defective locations echo in the foundation pile of below ground；Vertical line A4 is calculated further, thus it is speculated that go out, ground with
Broken pile or defect is there is at lower 15 meters.
Drawbacks described above position location, empirical tests, it is consistent with actual defects position.
By this highway becomes bridge pier base carry out VSP peg test, it is concluded that
1., for becoming bridge pile detection, use the one-tenth bridge Nondestructive Pile-inspection Methods that the present invention provides, can be effective
Ground differentiates defect and the situation of the foundation pile located below ground level, and provides theoretical foundation for its reinforcement and repair.
2. peg result shows, with cymoscope receive the moment of vibration wave for timing initial point time, obtained ripple
Shape is more directly perceived, clearly.By oscillogram group is analyzed, pile defect position can be identified exactly.
The one-tenth bridge Nondestructive Pile-inspection Methods that the present invention provides, has the advantage that
Fast and effectively the peak that the peak that defective locations produces produces with up echo can be separated, reach accurate
The purpose of the pile defect position located below ground level.
The above is only the preferred embodiment of the present invention, it is noted that common for the art
For technical staff, under the premise without departing from the principles of the invention, it is also possible to make some improvements and modifications,
These improvements and modifications also should regard protection scope of the present invention.
Claims (4)
1. an one-tenth bridge Nondestructive Pile-inspection Methods, it is characterised in that described one-tenth bridge Nondestructive Pile-inspection Methods
The pile quality located below ground level after detecting into bridge；Wherein, described Cheng Qiao includes foundation pile, is positioned at institute
State the bridge pier above Under Pile top and be positioned at the bent cap above described bridge pier；
Described one-tenth bridge Nondestructive Pile-inspection Methods comprises the following steps:
S1, the most arbitrarily chooses survey line at bridge pier；
S2, near ground configuration cymoscope on the described survey line of bridge pier, and, it is being positioned at described cymoscope
On the described survey line of top, it is sequentially arranged shot point J1, shot point J2, shot point Ji at equal intervals ... shot point
Jn；Wherein, n >=2；
S3, makes shot point J1 be excited, and shot point J1 produces at least three road vibration waves simultaneously after being excited；
Wherein, first via vibration wave is referred to as direct wave, and its propagation path is: straight line after shot point J1
Travel to cymoscope, it may be assumed that propagation distance is the shot point J1 air line distance to cymoscope；
Second road vibration wave is referred to as upgoing wave, and its propagation path is: upwardly propagate to bent cap from shot point J1,
Travel to cymoscope after being reflected by bent cap again, it may be assumed that propagation distance be shot point J1 to bent cap air line distance with
Bent cap is to the air line distance sum of cymoscope；
3rd road vibration wave is referred to as down going wave, is divided into two kinds, and the first propagation path is: from shot point J1 to
Under propagate to, at the bottom of the stake of foundation pile, be traveled to cymoscope after pile bottom reflection again, it may be assumed that propagation distance is shot point
J1 is to the air line distance sum arriving cymoscope at the bottom of the air line distance at the bottom of stake and stake；The second propagation path is: from
Shot point J1 propagates to defective locations, travels to cymoscope again, it may be assumed that propagation distance after being reflected by defective locations
For air line distance and the defective locations of shot point J1 to defective locations to the air line distance sum of cymoscope；
S4, described cymoscope is set the timeorigin starting timing by preset rules, then, with the time as horizontal stroke
Coordinate, with the vibration wave amplitude received by cymoscope as vertical coordinate, obtains 1st corresponding with shot point J1
Oscillogram；
S5, then, makes shot point J2 be excited, and shot point J2 produces at least three road vibration waves after being excited；
Described cymoscope is set the timeorigin starting timing by described preset rules, then, with the time as abscissa,
With the vibration wave amplitude received by cymoscope as vertical coordinate, obtain 2nd oscillogram corresponding with shot point J2；
The rest may be inferred, makes shot point J3 the most respectively ... shot point Jn is excited, and respectively obtains and shot point
The 3rd corresponding for J3 oscillogram ... n-th oscillogram corresponding with shot point Jn；
Thus there are n oscillogram, this n oscillogram has identical timeorigin；
S6, sets up rectangular coordinate system, and wherein, abscissa is the time, and vertical coordinate is oscillogram numbering, by n
Individual oscillogram represents that this rectangular coordinate is fastened, and obtains the oscillogram group corresponding with described survey line；To described ripple
The travel time curve slope of shape figure group is analyzed, the foundation pile obtaining locating below ground level in described one-tenth abutment stake
Defect analysis result；
Wherein, in S6, the travel time curve slope of described oscillogram group is analyzed, obtains described one-tenth abutment
The defect analysis result of the foundation pile located below ground level in Zhuan, specifically includes following steps:
S6.1, for oscillogram i corresponding with shot point Ji, in conjunction with the preset rules of beginning timing, then to shake
Dynamic ripple spread speed c in pile foundation is given value, with cymoscope the distance distance on ground, this shot point i
At the bottom of the distance distance on ground, the distance of bent cap to ground and stake, the distance on distance ground is given value, meter
Calculate and obtain that direct wave is detected time point ti-1 that ripple detects, bent cap echo is detected the time that ripple detects
Point ti-2 and reflection wave at the bottom of pile are detected the time point ti-3 that ripple detects；
By t1-1, t2-1 in described oscillogram group ... tn-1 is linked in sequence and obtains straight line Z1, its slope is H1；
By t1-2, t2-2 in described oscillogram group ... tn-2 is linked in sequence and obtains straight line Z2；Its slope is H2；
By t1-3, t2-3 in described oscillogram group ... tn-3 is linked in sequence and obtains straight line Z3；Its slope is H3；
S6.2, then, for any one oscillogram i, it is judged that whether oscillogram i exists except time point ti-1,
Obvious crest outside ti-2 and ti-3 position or substantially trough, if it has, all emphasis mark this obvious crest or
Substantially trough；
Then, use different connected modes, by the obvious crest of each oscillogram or substantially trough is in order
Connect, obtain a plurality of straight line；And determine whether to be connected in the straight line obtained, if there is slope is also
The straight line of H3, if it has, this straight line is designated as Z4, then obtains what straight line Z4 intersected with each oscillogram
Abscissa value, i.e. time value, then with this time value as given value, extrapolate the defect corresponding to this time value
Position, this defective locations is in described one-tenth abutment stake the defect analysis result of the foundation pile located below ground level.
One-tenth bridge Nondestructive Pile-inspection Methods the most according to claim 1, it is characterised in that in S2, position
On described survey line above described cymoscope, by order from top to bottom or depend on by sequence from low to uper part at equal intervals
Secondary layout shot point J1, shot point J2, shot point Ji ... shot point Jn.
One-tenth bridge Nondestructive Pile-inspection Methods the most according to claim 1, it is characterised in that in S4, institute
State preset rules to refer to:
After the shot point being arranged in described survey line is triggered, it is arranged in the cymoscope of this survey line from receiving
Timing is started from 0 during vibration wave.
One-tenth bridge Nondestructive Pile-inspection Methods the most according to claim 1, it is characterised in that after S6,
Also include:
S7, other axial locations at bridge pier choose N bar survey line, for each selected survey line, all
The method using S2-S6, carries out Non-Destructive Testing to selected survey line；Therefore, for each survey line,
All obtain the defect analysis result of the foundation pile located below ground level in described one-tenth abutment stake；Thus there are N+1
Individual defect analysis result, this described N+1 defect analysis result is mutually authenticated, thus obtains described one-tenth abutment
The final defect analysis result of the foundation pile located below ground level in Zhuan.
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| CN104536001B (en) * | 2015-01-15 | 2017-01-18 | 云南航天工程物探检测股份有限公司 | Cylindrical pier quality detection method based on data slices |
| CN104727357B (en) * | 2015-03-27 | 2016-04-20 | 浙江大学宁波理工学院 | The detection of the defect of pile foundation of bored pile and method for repairing and mending |
| CN107975076B (en) * | 2016-08-09 | 2019-10-11 | 河北天璞基础工程有限公司 | Parallel seismic wave method determines the detection device and its detection method of foundation pile length |
| CN107246035B (en) * | 2017-07-19 | 2018-07-17 | 交通运输部公路科学研究所 | A kind of main pier concrete pile foundation breakdown diagnosis method of bridge spanning the sea |
| CN109577384A (en) * | 2018-11-30 | 2019-04-05 | 中铁第四勘察设计院集团有限公司 | A kind of long detection method of multiple tracks stake |
| CN109541690B (en) * | 2018-11-30 | 2020-05-19 | 中铁第四勘察设计院集团有限公司 | Method for evaluating loose degree of shallow medium structural surface |
| CN112525998B (en) * | 2020-11-11 | 2023-04-25 | 中铁第四勘察设计院集团有限公司 | Wall quality detection method and device |
| CN112502198A (en) * | 2020-11-18 | 2021-03-16 | 无锡同济工程质量检测有限公司 | Online pile foundation detection system |
| CN113188488B (en) * | 2021-04-29 | 2023-07-14 | 江河工程检验检测有限公司 | Nondestructive measuring method for length of anchor rod |
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Denomination of invention: Non destructive testing method for bridge foundation piles Granted publication date: 20160824 Pledgee: Kunming Branch of China Everbright Bank Co.,Ltd. Pledgor: YUNNAN AEROSPACE ENGINEERING GEOPHYSICAL SURVEY INSPECTION Co.,Ltd. Registration number: Y2024530000025 |