CN104727357B - The detection of the defect of pile foundation of bored pile and method for repairing and mending - Google Patents
The detection of the defect of pile foundation of bored pile and method for repairing and mending Download PDFInfo
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- 239000013307 optical fiber Substances 0.000 claims abstract description 65
- 230000002159 abnormal effect Effects 0.000 claims abstract description 24
- 230000007423 decrease Effects 0.000 claims abstract description 14
- 238000007569 slipcasting Methods 0.000 claims description 9
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- 229910001069 Ti alloy Inorganic materials 0.000 description 1
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Abstract
The present invention discloses a kind of detection and method for repairing and mending of defect of pile foundation of bored pile, its committed step is: when heater (5) is positioned at certain degree of depth, only the waveform peak of a hotness optical fiber (4) declines, then judge pile body (1) cavity of this degree of depth, and cavity is positioned on pile body (1) cross section through on the radius of abnormal hotness optical fiber (4); When heater (5) is positioned at certain degree of depth, if there is the waveform peak of two adjacent hotness optical fiber (4) to decline, judge pile body (1) cavity of this degree of depth, and the two radius that cavity is located across two abnormal hotness optical fiber (4) holds on sector; When heater (5) is positioned at certain degree of depth, the equal peak value of waveform of whole hotness optical fiber (4) declines, then judge that this degree of depth exists broken pile.The method is not undetected and accurately can record longitudinal degree of depth of each layer broken pile, the longitudinal degree of depth recording again each cavity and cavity and be positioned at lateral attitude on pile foundation cross section, can also carry out Efficient software patching to each defect.
Description
Technical field
The present invention relates to the health monitoring field of the bored pile in civil engineering, is specifically a kind of detection and method for repairing and mending of defect of pile foundation of bored pile.
Background technology
Due to piling exist noise large, affect the unfavorable factors such as environment, therefore generally adopt bored pile in the intensive urban construction of building more.But the quality of bored pile is subject to geographical environment, plant equipment, the people factor impact such as be maloperation, easily produce defect of pile foundation, namely there is broken pile or cavity in pile foundation concrete.
The general employing low strain dynamic stress wave of prior art detects defect of pile foundation, this detection method is based upon on the basis of elasticity reflection theory, its general principle is, inductive probe is touched stake top, knock stake top, produce a vertical stress wave propagated in pile body, when pile body existing defects, during as encountered cavity or broken pile in stress wave conductive process, reflection and transmission will be there is in stress wave, the waveform of stress wave, phase place, amplitude, a series of change can occur the pile foundation signals such as the time that frequency and ripple arrive and this change can be gathered by the inductive probe being positioned at stake top, by analyzing above-mentioned pile foundation signal to judge the integrality of pile body.
Prior art following drawback is existed to the method that pile foundation detects: one, the method is easy especially undetected to cavity, because inductive probe area is less, the scope of the pile foundation signal of actual acquisition is only on the straight line that vertically extends downwards of the point at probe place, claim this straight line for sampling vertical line for ease of statement, if cavity is just in time positioned at sampling, vertical line could be detected, but in most cases cavity is not positioned at sampling vertical line, therefore perception of having no way of, in fact, the method is only more sure to the detection of broken pile, two, if same sampling vertical line exists multiple defect of pile foundation of differing heights, as multiple cavity, or multilayer broken pile, or existing broken pile has cavity again, then all can there is reflection and transmission at each fault location in stress wave, the multiple defects be positioned on same sampling vertical line are disturbed mutually to signal, cannot determine in actual detection that on this sampling vertical line, defect belongs to broken pile or cavity on earth at all, also cannot know the number in broken pile and cavity has how many on earth, cannot know that broken pile and the empty degree of depth are how many on earth equally, the i.e. suitable inaccuracy of testing result, Detection results is very poor, three, prior art lacks effective means and repairs defect of pile foundation.
Summary of the invention
The technical problem that the present invention will solve is, provides a kind of not undetected and accurately can record longitudinal degree of depth of each layer broken pile, the longitudinal degree of depth recording again each cavity and cavity and be positioned at lateral attitude on pile foundation cross section, can also carry out detection and the method for repairing and mending of the defect of pile foundation of the bored pile of Efficient software patching to each defect.
A kind of technical solution of the present invention is, provide a kind of detection and method for repairing and mending of defect of pile foundation of bored pile, its step is as follows:
A, when pouring into a mould bored pile, a reserved center vertical core and several edge vertical cores, whole edges vertical core is positioned at circumferentially same and is uniformly distributed circumferentially, center vertical core and all through whole pile body of edge vertical core;
B, in each edge vertical core, lay the vertical hotness optical fiber running through edge vertical core, every bar hotness optical fiber is connected with detecting instrument;
C, a heater is fixed on the lower end of a pull rope, heater is put into center vertical core, and draw centrally vertical core by pull rope and slowly decline;
D, heater give off heat through pile body concrete, and by each hotness collecting fiber, end reaction is on the display of detecting instrument, form one with the heater degree of depth for abscissa and the waveform that hotness fiber optic temperature is ordinate, this waveform with the degree of depth at heater place for peak value successively decreases to both sides, when the pile cutoff zero defect at heater place, the waveform that each hotness optical fiber shows is all consistent, makes this waveform be reference waveform;
E, constantly to decline along with heater, the waveform of each hotness optical fiber also can along with constantly moving down, when heater is positioned at a certain degree of depth, only there are the abnormal conditions that peak value declines and other hotness optical fiber waveform is normal in the waveform of a hotness optical fiber, then judge that the pile body of this degree of depth exists cavity, and cavity be positioned at this degree of depth of pile body cross section on through on the radius of abnormal hotness optical fiber; When heater is positioned at a certain degree of depth, if have the waveform of two adjacent hotness optical fiber to occur the abnormal conditions that peak value declines and other hotness optical fiber waveform is normal simultaneously, then judge that the pile body of this degree of depth exists cavity, and the two radius that the lateral attitude in cavity is located across two abnormal hotness optical fiber holds on sector; When heater is positioned at a certain degree of depth, if all the abnormal conditions that peak value declines all appear in the waveform of hotness optical fiber, then judge that this degree of depth exists broken pile;
F, continued to move down by heater, until arrive at the bottom of stake, and constantly judge with the decision method in step e in decline process, by pile body, whole broken pile degree of depth, empty longitudinal degree of depth and lateral attitude detect one by one from top to bottom;
If this pile body of g exists broken pile, then normal pressure grouting is carried out to whole edge vertical cores and center vertical core simultaneously, be poured into the broken pile place degree of depth always, then carry out high-pressure slip-casting, broken pile place is tamped; If there are the abnormal conditions that peak value declines in an only hotness optical fiber of a certain degree of depth, then for the edge vertical core normal pressure grouting at this hotness optical fiber place to the degree of depth at empty place, then carry out high-pressure slip-casting, by high pressure, cavity near this edge vertical core tamped; If there are the abnormal conditions that peak value declines in two of a certain degree of depth photosensitive fibres of adjacent heat simultaneously, then simultaneously by two edge vertical core normal pressure groutings at two hotness optical fiber places to the empty place degree of depth, last simultaneously to two edges vertical core high-pressure slip-casting, by high pressure, the cavity between the vertical core of two edges is tamped;
After whole cavity of h, pile body and broken pile are all repaired and tamped, center vertical core and whole edges vertical core are grouted into stake top.
This detection side's ratio juris is as follows.Heat transmission effect in the concrete of solid densification is optimal, so, under normal circumstances, when there is not cavity and broken pile, the heat that heater is radiated hotness optical fiber is maximum, the waveform stabilization of hotness optical fiber, once there is defect at heater co-altitude, then affect heat transfer effect, reacting on the waveform of hotness optical fiber is exactly that peak value declines, therefore peak value is when declining the most obvious, the degree of depth of corresponding heater is exactly the degree of depth of defect of pile foundation; If all hotness optical fiber occurs that peak value declines all simultaneously, be then broken pile certainly; Abnormal if not whole hotness optical fiber, but some is normal, there is cavity exactly in that, cavity can have influence on the peak value of the waveform of the hotness optical fiber near it, if two photosensitive fine peak atenuations of adjacent heat, then judge that cavity is certainly between two photosensitive fibres of adjacent heat, namely pile body cross section occurs in the sector region clamped by two radiuses of the hotness optical fiber of decay through two; If peak atenuation appears in a hotness optical fiber, that illustrates, being positioned on pile body cross section through on that radius of decay hotness optical fiber of cavity.Resolution principle as the empty degree of depth is consistent with broken pile degree of depth resolution principle, the degree of depth of heater corresponding when being all hotness optical fiber attenuations.
The detection of the defect of pile foundation of bored pile of the present invention and method for repairing and mending compared with prior art, have the following advantages and beneficial effect.
Because the analysis of the preceding paragraph is known, utilize the method, accurately can judge that defect of pile foundation belongs to cavity or broken pile on earth; And complete detection can be carried out for the defect of whole pile body, not undetected; And the method overcome the problem that in prior art testing process, each defect is interfered mutually; More accurately can record longitudinal degree of depth of each layer broken pile, the longitudinal degree of depth recording again each cavity and cavity and be positioned at lateral attitude on pile foundation cross section; And, the concrete locus of each defect has been recorded just because of the method, therefore can specific aim strongly each defect be repaired, and concrete mending course be first normal pressure grouting to depth of defect, then creationary secondary high pressure grouting correction of the defect, is especially positioned at the cavity near edge vertical core, this defect almost cannot be repaired in the prior art, but the first normal pressure grouting of method of the present invention is to neighbouring height, then high-pressure osmosis is filled, and repair efficiency is ideal; Moreover, after mending course completes, center vertical core and whole edge vertical cores are mended slurry and tamp, ensure that the integrality of pile body, achieve nondestructive testing.
Accompanying drawing explanation
Fig. 1 is the side sectional structure schematic diagram of the detection of the defect of pile foundation of bored pile of the present invention and the device of method for repairing and mending.
Fig. 2 is the plan structure schematic diagram of the detection of the defect of pile foundation of bored pile of the present invention and the device of method for repairing and mending.
Fig. 3 is the schematic diagram of the detection of the defect of pile foundation of bored pile of the present invention and the reference waveform of method for repairing and mending.
Fig. 4 is the schematic diagram of the waveform under the detection of the defect of pile foundation of bored pile of the present invention and the appearance broken pile situation of method for repairing and mending.
Fig. 5 is the schematic diagram of the waveform under the appearance cavity situation of the detection of the defect of pile foundation of bored pile of the present invention and method for repairing and mending.
Shown in figure 1, pile body, 2, center vertical core, 3, edge vertical core, 4, hotness optical fiber, 5, heater, 6, pull rope.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the invention will be further described.
As shown in Figure 1, Figure 2, shown in Fig. 3, Fig. 4, Fig. 5, the detection of the defect of pile foundation of bored pile of the present invention and method for repairing and mending, its step is as follows.
A, when pouring into a mould bored pile, a reserved center vertical core 2 and several edge vertical cores 3, whole edges vertical core 3 is positioned at circumferentially same and is uniformly distributed circumferentially, center vertical core 2 and all through whole pile body 1 of edge vertical core 3.When building bored pile, first pre-buried multiple vertical sleeve, extracts out after building to form each edge vertical core 3 and center vertical core 2 again.In the present embodiment, if four edge vertical cores 3, their circumferential position is 0 °, 45 °, 90 ° and 135 ° respectively.
B, in each edge vertical core 3, lay the vertical hotness optical fiber 4 running through edge vertical core 3, every bar hotness optical fiber 4 is connected with detecting instrument.Described detecting instrument is the photosensitive fine Research on Automatic Measuring System of Temperature of the distributed heat of prior art, and DistributedTemperatureSensing, is abbreviated as DTS.
C, a heater 5 is fixed on the lower end of a pull rope 6, heater 5 is put into center vertical core 2, and draw centrally vertical core 2 by pull rope 6 and slowly decline.Described heater 5 is the heater 5 of prior art, and as titanium alloy heater, Elema etc., heating temp is no more than 200 DEG C, otherwise concrete easily occurs the Decrepitation Phenomena that is heated.
D, heater 5 give off heat through pile body 1 concrete, and gathered by each hotness optical fiber 4, end reaction is on the display of detecting instrument, form one with heater 5 degree of depth for abscissa and the waveform that hotness optical fiber 4 temperature is ordinate, this waveform with the degree of depth at heater 5 place for peak value successively decreases to both sides, when the pile cutoff zero defect at heater 5 place, on each hotness optical fiber 4, the waveform of display is all consistent, makes this waveform be reference waveform.
Specifically, abscissa represents the degree of depth at heater 5 place, and the degree of depth on ground is 0m, and then the degree of depth increases progressively downwards gradually.The peak value of this reference waveform appears at the degree of depth corresponding to heater 5, on abscissa from the heater 5 place degree of depth more away from then heat is less, finally make zero.
E, constantly to decline along with heater 5, the waveform of each hotness optical fiber 4 also can along with constantly moving down, when heater 5 is positioned at a certain degree of depth, only there are the abnormal conditions that peak value declines and other hotness optical fiber 4 waveform is normal in the waveform of a hotness optical fiber 4 compared with reference waveform, then judge that the pile body 1 of this degree of depth exists cavity, and cavity be positioned at this degree of depth of pile body 1 cross section on through on the radius of abnormal hotness optical fiber 4; Such as the waveform of hotness optical fiber 4 on that edge vertical core 3 of 0 ° declines and the waveform of its excess-three bar hotness optical fiber 4 is normal, then illustrate that cavity is positioned on that radius of 0 ° of the cross section of this height of pile body 1; When heater 5 is positioned at a certain degree of depth, if have the waveform of two adjacent hotness optical fiber 4 to occur the abnormal conditions that peak value declines and other hotness optical fiber 4 waveform is normal simultaneously, then judge that the pile body 1 of this degree of depth exists cavity, and the two radius that the lateral attitude in cavity is located across two abnormal hotness optical fiber 4 holds on sector; As the peak atenuation simultaneously of two hotness optical fiber 4 on the edge vertical core 3 of 90 ° and 135 °, then to judge on the cross section that cavity is positioned at this height of pile body 1 on 90 ° and sector folded by 135 ° of two radiuses; When heater 5 is positioned at a certain degree of depth, if all the abnormal conditions that peak value declines all appear in the waveform of hotness optical fiber 4, then judge that this degree of depth exists broken pile.
Comparison peak value is relied on to decline in this step and the cavity of acquisition or the degree of depth of broken pile are not all the definitely accurate degree of depth in fact, because cavity and broken pile itself have certain height, as cavity height 3cm, then the degree of depth is that waveform in this section of depth bounds between 5 meters to 5.03 meters all there will be peak value and declines, in practical operation, that the peak value choosing waveform declines the most obvious degree of depth as the degree of depth that is empty or broken pile in fact, although this degree of depth is not definitely accurately, there is a little error, namely cavity height itself as 3cm the error that formed, but this point tolerance is for the pile foundation moving then tens meters, its accuracy is still secure, and, later stage is when carrying out defect mending, with the degree of depth of this accuracy for benchmark, its repairing effect also can be protected completely, therefore actual operation also can reach the requirement of correction of the defect completely.
F, continued to move down by heater 5, until arrive at the bottom of stake, and constantly judge with the decision method in step e in decline process, by pile body 1, whole broken pile degree of depth, empty longitudinal degree of depth and lateral attitude detect one by one from top to bottom.
If this pile body 1 of g exists broken pile, then normal pressure grouting is carried out to whole edge vertical cores 3 and center vertical core 2 simultaneously, be poured into the broken pile place degree of depth always, then carry out high-pressure slip-casting, broken pile place is tamped; If there are the abnormal conditions that peak value declines in an only hotness optical fiber 4 of a certain degree of depth, then for edge vertical core 3 normal pressure grouting at this hotness optical fiber 4 place to the degree of depth at empty place, carry out high-pressure slip-casting again, by high pressure, cavity near this edge vertical core 3 is tamped; If there are the abnormal conditions that peak value declines in two of a certain degree of depth adjacent heat photosensitive fine 4 simultaneously, then simultaneously by two edge vertical core 3 normal pressure groutings at two hotness optical fiber 4 places to the empty place degree of depth, last simultaneously to two edges vertical core 3 high-pressure slip-casting, by high pressure, the cavity between two edges vertical core 3 is tamped.
Normal pressure grouting in this step refers in filling process the mobility utilizing cement paste, does not apply pressure to it; And high pressure grouting refers to that employing pressure grouting machine is exerted pressure to it, pressure limit is 0.5MPa ~ 5MPa.
After whole cavity of h, pile body 1 and broken pile are all repaired and tamped, center vertical core 2 and whole edges vertical core 3 are grouted into stake top.
Claims (1)
1. the detection of the defect of pile foundation of bored pile and a method for repairing and mending, is characterized in that: its step is as follows:
A, pour into a mould bored pile time, a reserved center vertical core (2) and several edge vertical cores (3), whole edges vertical core (3) are positioned at circumferentially same and are uniformly distributed circumferentially, center vertical core (2) and all through whole pile body (1) of edge vertical core (3);
B, at each edge vertical core (3) in lay a vertical hotness optical fiber (4) of running through edge vertical core (3), every bar hotness optical fiber (4) is connected with detecting instrument;
C, a heater (5) is fixed on the lower end of a pull rope (6), heater (5) is put into center vertical core (2), and draws centrally vertical core (2) by pull rope (6) and slowly decline;
D, heater (5) give off heat through pile body (1) concrete, and gathered by each hotness optical fiber (4), end reaction is on the display of detecting instrument, form one and be abscissa with heater (5) degree of depth and hotness optical fiber (4) temperature is the waveform of ordinate, this waveform is that peak value successively decreases to both sides with the degree of depth at heater (5) place, when the pile cutoff zero defect at heater (5) place, the waveform of the upper display of each hotness optical fiber (4) is all consistent, makes this waveform be reference waveform;
E, constantly to decline along with heater (5), the waveform of each hotness optical fiber (4) also can along with constantly moving down, when heater (5) is positioned at a certain degree of depth, only there are the abnormal conditions that peak value declines and other hotness optical fiber (4) waveform is normal in the waveform of a hotness optical fiber (4), then judge that the pile body (1) of this degree of depth exists cavity, and cavity be positioned at pile body (1) this degree of depth cross section on through on the radius of abnormal hotness optical fiber (4); When heater (5) is positioned at a certain degree of depth, if have the waveform of two adjacent hotness optical fiber (4) to occur the abnormal conditions that peak value declines and other hotness optical fiber (4) waveform is normal simultaneously, then judge that the pile body (1) of this degree of depth exists cavity, and the two radius that the lateral attitude in cavity is located across two abnormal hotness optical fiber (4) holds on sector; When heater (5) is positioned at a certain degree of depth, if all the abnormal conditions that peak value declines all appear in the waveform of hotness optical fiber (4), then judge that this degree of depth exists broken pile;
F, heater (5) is continued to move down, until arrive at the bottom of stake, and constantly judge with the decision method in step e in decline process, by pile body (1), all the broken pile degree of depth, empty longitudinal degree of depth and lateral attitude detect one by one from top to bottom;
If this pile body of g (1) exists broken pile, then normal pressure grouting is carried out to whole edge vertical cores (3) and center vertical core (2) simultaneously, be poured into the broken pile place degree of depth always, then carry out high-pressure slip-casting, broken pile place is tamped; If there are the abnormal conditions that peak value declines in an only hotness optical fiber (4) of a certain degree of depth, then for edge vertical core (3) normal pressure grouting at this hotness optical fiber (4) place to the degree of depth at empty place, carry out high-pressure slip-casting again, by high pressure, cavity near this edge vertical core (3) is tamped; If there are the abnormal conditions that peak value declines in two of a certain degree of depth photosensitive fibres of adjacent heat (4) simultaneously, then simultaneously by two edge vertical core (3) normal pressure groutings at two hotness optical fiber (4) places to the empty place degree of depth, last simultaneously to two edges vertical core (3) high-pressure slip-casting, by high pressure, the cavity be positioned between two edges vertical core (3) is tamped;
After whole cavity of h, pile body (1) and broken pile are all repaired and tamped, center vertical core (2) and whole edges vertical core (3) are grouted into stake top.
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105484301A (en) * | 2015-11-24 | 2016-04-13 | 山东交通职业学院 | Bridge bored pile foundation repairing method |
| CN110318431A (en) * | 2018-03-30 | 2019-10-11 | 周兆弟 | A kind of long detection method of pile foundation stake |
| CN110512662B (en) * | 2018-04-21 | 2021-09-21 | 西安航天建设监理有限公司 | Pile foundation quality detection method |
| CN111472395B (en) * | 2020-06-03 | 2022-02-25 | 广东财贸建设工程顾问有限公司 | Building engineering bored concrete pile defect detecting system |
| CN112459134B (en) * | 2020-10-30 | 2021-12-14 | 河海大学 | Fault detection equipment and method for bored pile body by using magnetic field |
| CN112922050A (en) * | 2021-02-01 | 2021-06-08 | 上海建工二建集团有限公司 | Method and device for detecting integrity of foundation pile |
| CN112922049A (en) * | 2021-02-01 | 2021-06-08 | 上海建工二建集团有限公司 | Wall integrity detection device and method for underground continuous wall |
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