CN1296572C - Method for monitoring pile foundation construction quality and reinforcing pile foundation by electric exploring method - Google Patents
Method for monitoring pile foundation construction quality and reinforcing pile foundation by electric exploring method Download PDFInfo
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- CN1296572C CN1296572C CNB031268587A CN03126858A CN1296572C CN 1296572 C CN1296572 C CN 1296572C CN B031268587 A CNB031268587 A CN B031268587A CN 03126858 A CN03126858 A CN 03126858A CN 1296572 C CN1296572 C CN 1296572C
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Abstract
The present invention relates to a method for monitoring pile foundation construction quality and a reinforcing technique by an electric exploring method, which is suitable for monitoring the construction quality of hole drilling (digging) piles, underground continuous walls, sinking pipe casting pipes, CFG piles, etc. The present invention is characterized in that an electric exploring method is adopted for detecting the quality of a clean hole; the construction quality of pouring concrete is monitored for accurately judging the defect property of the concrete, influence degree and generating reasons; when the concrete is in a flow state, a defect can be reinforced and a treating effect can be detected; the water quality of a sound detecting pipe can be detected; an underground potential flow can be detected and treated. The present invention replaces the date of constructing a pile foundation by experience, effectively enhances engineering quality, reduces the loss, and ensures a construction period.
Description
Technical field
The present invention relates to the method for quality examination, monitoring and the consolidation process technology of brill (digging) hole stake, diaphragm wall, tube-sinking cast-in-situ pile work progress.
Background technology
Pile foundation engineering is a concealed work, the factor that influences the pile foundation construction quality is ever-changing, the quality problems that occur are a lot, consequence is also very serious, the direct losses that cause because of the pile foundation construction quality problems in the annual whole nation are no less than several hundred million units, and the pile foundation that therefore grows up detection market reaches the scale more than 1,000,000,000 yuan.The pile foundation construction quality is the key point of Control Engineering quality, cost, duration.Detect the way that guarantees workmanship by checking and accepting behind the pile at present, seeming lags behind and must pay a price for this reason, and the pile foundation construction process monitoring becomes more and more important.Now existing plant and instrument that relevant hole quality detects, the precipitation soil thickness detects, the concrete interface detects influence some of pile foundation construction quality factors but can only detect, and can't detect the result of concrete construction quality.Pile foundation construction quality monitoring is the direction of engineering detecting development, but does not still have major progress so far.
Summary of the invention
The purpose of this invention is to provide that a kind of principle is simple, the reliable pile foundation construction quality monitoring of method and reinforcing technique, by detecting sand factor, precipitation soil thickness and the settling rate thereof of estimating mud, guarantee hole quality clearly; By technology such as pile concrete pouring quality monitoring and the detection of concrete spouting end face absolute altitude, minimum pipe laying depth monitorings, accurately, in time estimate the pile concrete construction quality, judge that defects property, influence degree and generation reason appear in the concrete spouting process; Conscientiously adopt this monitoring technique guiding construction, reduce the pile body concrete quality problem that causes because of the precipitation soil thickness exceeds standard, pipe laying depth control is not tight etc., eliminate short circuit pile crown phenomenon, guarantee that pile concrete is continuous; Guidance is adopted when the concrete fluidised form and is poured into displacement method, gas-lift slag discharging method, jet grounting etc. carry out consolidation process and monitoring consolidation process to rejected region effect repeatedly; Promptly sound detecting pipe water quality is detected behind the concrete perfusion, judge whether sound detecting pipe leaks water inlet mud or mud, clearly whether decision the hole, prevents the cement paste plugging and eliminates the phenomenon that causes the sounding erroneous judgement because of spillage in the pipe, reduces unnecessary loss; Detect to judge whether pore-forming passes underground undercurrent, concrete mix and concrete are caused serious erosion so that take measures to prevent underground undercurrent.Take leave of the age of pile foundation by effective construction monitoring, reach the raising workmanship, reduce the loss, guarantee the effect of duration by the experience construction.
The technical solution adopted for the present invention to solve the technical problems is: the electrical resistivity survey instrument is mounted on the sensor of being made up of fixed electrode on the neighboring of the conduit outlet in the pore-forming of pile foundation by lead, detect the character and the distribution of concrete mix in the pore-forming, segregating concrete mixture, mud, these different mediums of sand, reach the purpose that the pile foundation construction quality is detected and monitors.
Different media has different resistance or resistivity, can cause that respective change takes place measuring circuit electrical measurement value (as parameters such as voltage, electric currents).According to experiment, the concrete mix of identical match ratio has certain resistance or resistivity, sensor with the fixed electrode composition, when concrete mix is emanated, fusion during different mediums such as mud, respective change can take place in the electrical measurement value of the concrete mix of segregation, and with the segregation degree stronger dependency relation is arranged.Test shows that also the compressive strength of concrete disintegration degree and electrical measurement value and concrete component has dependency relation, therefore according to surveying the classification that electrical measurement value prediction concrete strength is divided concrete defect, can accurately estimate the concrete practice of construction quality level of pile foundation, go forward to go a step further in pile foundation construction quality monitoring and pile foundation Dynamic Non-Destruction Measurement.
Sensor is installed on the align member that is fixed on the conduit outlet neighboring, makes all concrete construction qualities of the as close as possible stake of sensor guarantee the relatively low position of probability by align member, to improve the fraction that detects effect.Evenly arrange a plurality of sensors with appropriate to the occasion at same section, detect the order of severity of defective and the position relation of each sensor, accurately judge defects property, distribution and influence degree according to each sensor.
Pile foundation quality of concreting problem is much with the installation of conduit with use relevant.Sensor is installed on the medial surface of conduit outlet, is used for the quality situation of the concrete mix in the detected catheter, can be used for monitoring tube and whether return slurry, defective such as whether the analysis and judgement conduit occurs breaking or joint is not tight.When quality problems occurring, also can utilize the control of this sensor that the concrete of emanating in the conduit is emitted on the normal concrete spouting end face, so that in time remove with gas lift method etc.Sensor is installed in conduit apart from 2m place, outlet top, the minimum pipe laying depth of concrete that is used for monitoring tube, can prevent to put forward the too fast accident that causes conduit to return slurry of pipe, simultaneously also can be used for monitoring concrete quality of pipe laying and top of concrete elevation, to prevent accident such as short circuit pile crown.
For sinking concrete filling pile and adopt the CFG stake etc. of immersed tube technology perfusion, sensor is installed on the sword pin or medial surface of a pipe, be used to monitor the pouring quality of the mixture of the concrete of perfusion or concrete mixture, prevent quality accidents such as broken pile, necking down.Whether have underground water, mud etc. flow into stake pipe in, make the concrete disintegration of back cover in the stake pipe if utilizing sensor also to can be used for monitoring the immersed tube process.
The invention is characterized in and sensor is directly inserted in the mud of pore-forming by lead, according to sand factor difference in the mud, the phenomenon that the resistance of mud or resistivity also can change thereupon, utilize the content of the relative measure of the change mud medium sand of electrical measurement value, precipitate the situation of change and the thickness of native medium sand content at the bottom of the sand factor of computation of mud and the analysis and judgement stake.Because the electrical property of different mud has than big difference, for detecting the sand factor in the mud, should be by demarcating relation and the correlation curve of confirming electrical measurement value and sand factor.Sensor is directly inserted in the coupling water of the pre-buried sound detecting pipe of pile foundation by lead, by measuring the water quality of coupling water, whether leak water inlet mud, mud etc. in the decidable sound detecting pipe, to prevent that water mud from solidifying the back and stopping up sound detecting pipe, or because impurity effects such as mud to the normal coupling of ultrasonic emitting and reception, cause the erroneous judgement to the pile body concrete quality testing result.
Utilize electric exploring method to detect outside the sand factor and precipitation soil thickness of mud, in pile foundation construction, also have other application, as by detecting the sand factor distribution situation of different depth in the hole, can further help to analyze the outstanding sand ability and the clear poroid attitude of mud, help to improve construction technology; Also can be by measuring the precipitation soil thickness after a settling rate of end precipitation soil thickness is estimated certain hour, the time that is used to instruct clear hole and determines to cut the ball concrete perfusion; In clear hole and concrete spouting process, increase suddenly when detecting the precipitation soil thickness, feeling to pop one's head in by lead directly contacts harder sediment relatively, can be judged as the hole that collapses to occur.
The invention is characterized in that having used above-mentioned principle monitors the consolidation process process of the segregating concrete mixture of fluidised form and detect the effect of consolidation process.Adopting jet grounting that the segregating concrete mixture of fluidised form is carried out consolidation process is characterised in that and passes through Grouting Pipe, the nozzle that is connected the Grouting Pipe exit is presented to the predetermined position of pile body segregating concrete mixture, with pressure cement paste is penetrated from nozzle, cement paste and segregating concrete mixture, precipitation soil, mud are mixed.For in time the defective concrete being carried out consolidation process, nozzle directly should be fixedly mounted on the neighboring of conduit outlet, when being installed, conduit installed and fixed Grouting Pipe and nozzle, utilize moving up and down and rotating of conduit when spraying grouting and reinforcing, it can be sprayed arbitrary defective of conduit periphery.
For guaranteeing to have time enough pile defect to be carried out consolidation process when the concrete fluidised form, the concrete mix that adopts should have enough initial setting times, simultaneously the job site should have corresponding construction equipment, as high pressure slurry pump, mix equipment such as slurry pulp storing barrel, churning pipe.
Consolidation process to concrete defect should be selected different reinforcing and processing methods for use according to the defect property difference, takes out the slag method, cuts ball perfusion, open cut facture etc. again as pouring into displacement method, gaslift repeatedly.Adopt gas lift method to take out the slag method and handle the pile concrete defective, the scene should have equipment such as air compressor machine, appendix, scum pipe.
Engineering practice is told us, after the pouring quality of pile concrete mixture meets the demands, also may be subjected to the serious erosion of underground undercurrent before concrete initial set, cement paste is run off form major defect.After the invention is characterized in that certain hour is left standstill in the hole clearly, sensor is inserted in the mud of pore-forming, measure whether washing away, diluting and cause its resistance or resistivity to change, of mud because of underground undercurrent to judge existing of underground undercurrent by lead.To there being the location of underground undercurrent, on the reinforcing cage neighboring, add a water-proof jacket, by the buffer action of water-proof jacket, avoid the erosion of underground undercurrent with the protection pile concrete.Water-proof jacket can adopt steel plate, plastic plate or thicker impermeability materials such as Polypropylence Sheet to make.
The invention has the beneficial effects as follows: utilize different medium that different resistance or resistivity are arranged, can cause that the principle of respective change takes place for the voltage, electric current etc. of measuring circuit, the electrical resistivity survey instrument is mounted on the sensor on the neighboring of conduit outlet by lead, the character and the distribution of different mediums such as check and analysis pore-forming inner concrete mixture, mud, sand, be used to detect the pouring quality of clear hole construction quality and concrete mix, the compressive strength of assessment segregating concrete mixture.Make the as close as possible stake periphery of sensor by align member during detection, to improve the fraction of testing result.Sensor is installed on the medial surface of conduit outlet, can detected catheter the quality of concrete mix of inside, defective such as whether monitoring tube occur returning slurry, break or joint is not tight, and be used to control the discharging of the interior segregating concrete of conduit.Sensor is installed in 2m place, conduit outlet top, can monitors minimum pipe laying depth, prevent the concrete quality problem that takes place because of pipe laying is too shallow, also can monitor the concrete quality of pipe laying simultaneously, prevent accidents such as short circuit pile crown.Conscientiously adopt this monitoring technique guiding construction, can significantly reduce the generation of construction quality accident, effectively improve the construction quality level.The present invention can monitor the consolidation process process of the segregating concrete mixture of fluidised form and detect the consolidation process effect.When adopting high-pressure injection method to handle the pile concrete defective, cement paste etc. is penetrated from nozzle, make cement paste and segregating concrete mixture and precipitate soil etc. to mix and play reinforcement effect; Nozzle directly is fixedly mounted on the outlet neighboring of conduit, when quality problems appear in concrete, can carries out effective consolidation process to defective fast.Directly sensor is presented in the mud by lead, can detect the sand factor and the distribution situation of different depth in the pore-forming, change thickness and state, the mud that to judge precipitation soil according to sand factor and hang grittiness energy, prediction precipitation soil thickness, be used to instruct pore-forming and clear hole to construct.Adopt electric exploring method can also in the check and analysis hole whether underground undercurrent appear, when underground undercurrent occurring, on the neighboring of reinforcing cage, add water-proof jacket, can protect pile concrete to avoid the erosion of underground undercurrent.Electric exploring method also can be used for detecting sound detecting pipe water quality, prevents that cement paste plugging and mud from impacting the sounding result.The present invention is applicable to the detection and the monitoring of a plurality of work progresss of cast-in-place concrete pile, diaphragm wall, tube-sinking cast-in-situ pile, CFG stake etc. on the spot, take leave of the age of pile foundation concealed work by the experience construction, reach and improve workmanship, reduce the loss, guarantee the effect of duration, especially the construction to the pile foundation of grow up stake and complicated geological structure has important practical significance and historic significance.
Description of drawings
Below in conjunction with drawings and Examples structural principle of the present invention and implementation method are further described.
Fig. 1 is the schematic diagram of pore-creating filling pile quality of concreting monitoring.
Fig. 2 is the schematic diagram of the multi-faceted monitoring of pore-creating filling pile quality of concreting.
Fig. 3 is the schematic diagram of pore-forming stake clear hole quality examination.
Fig. 4 is the schematic diagram of pile foundation sound detecting pipe water quality detection.
Fig. 5 is a schematic diagram of handling pile foundation concrete mix defective principle with high-pressure injection method.
Fig. 6 is a schematic diagram of handling the pile defect principle with the gas-lift slag discharging method.
Fig. 7 is the schematic diagram of tube-sinking cast-in-situ pile pouring quality monitoring.
Fig. 8 prevents and treats the schematic diagram of underground undercurrent to concrete corrosion with water-proof jacket.
1. electrical resistivity survey instrument, 2. pile foundation, 3. lead among the figure, 4. conduit, 5. sensor, 6. concrete mix, 7. segregating concrete mixture, 8. Grouting Pipe, 9. nozzle, 10. cement paste, 11. precipitation soil, 12. pore-formings, 13. mud, 14. sand, 15. sound detecting pipes, 16. coupling water, 17. align member, 18. the stake pipe, 19. tube-sinking cast-in-situ piles, 21. underground undercurrents, 22. reinforcing cage, 23. water-proof jacket, 24. scum pipes, 25. appendixs, a, b, c. be installed in three sensors of conduit mouth neighboring by align member, d. be installed in the sensor on the conduit mouth inwall, e. is installed in apart from the sensor at 2 meters, conduit mouth top by align member, and f. hangs the sensor in the mud in the hole by lead.
The specific embodiment
Embodiment 1
Pile foundation quality of concreting monitoring I
As shown in Figure 1, the pore-forming 12 of pile foundation 2 is mud 13 before concrete spouting.Be mounted on electrical resistivity survey instrument 1 on the neighboring of conduit 4 outlets by lead 3, the sensor of making by two fixed electrodes 5, measurement changes the pouring quality of analyzing concrete mix 6 because of dielectric resistance changes the voltage Vr that causes, judges the state of segregating concrete mixture 7.
1. by following requirement instrument is demarcated earlier before detecting.
1.1 by designing requirement concrete batching mixture.
1.2 the silt and the mud of precipitation at the bottom of getting, the SN of weighing blended amount respectively is 5.0%, 10.0%, 20.0%30.0%, 40.0%, 50.0%, 60.0% silt particle and mud, join in the concrete mix step by step, and the segregating concrete mixture 7 in the hybrid analog-digital simulation pile foundation.Sensor is inserted into respectively survey in the mixture of concrete mix and reads corresponding voltage value Vri.
1.3 as 1.2 do parallel demarcation more than three times.
1.4. the mixed proportion as 1.2 is made corresponding concrete standard test specimen respectively, maintenance was done compressive strength test after 28 days.
1.5. draw the relation curve of magnitude of voltage Vr and concrete crushing strength R, magnitude of voltage Vr and blended amount SN, concrete crushing strength R and blended amount SN.
2. determine the criterion of concrete disintegration degree and judgement:
2.1 detect the foundation of differentiation and determining of criterion.
The size of the concrete strength of concrete disintegration degree utilization prediction is as basis for estimation.Check and accept factors such as evaluation criteria, structure service condition according to concrete construction controlling level, concrete strength, the criterion quasi-definite of concrete disintegration degree is:
Normal concrete criterion prediction concrete strength is the Vr value of 0.95R correspondence, is defined as Vra
Slight segregation criterion prediction concrete strength is the Vr value of 0.85R correspondence, is defined as Vrb
Obviously segregation criterion prediction concrete strength is the Vr value of 0.5R correspondence, is defined as Vrc
Serious segregation criterion prediction concrete strength is the Vr value of 0.25R correspondence, is defined as Vrd.
(R is the pile foundation concrete design strength)
2.2 the concrete disintegration degree defines.
Actual measurement Vr concrete mix when following scope is in following quality condition:
Vri 〉=Vra is normal concrete
Vra＞Vri 〉=Vrb is slight segregation
Vrb＞Vri 〉=Vrc obviously emanates
Vrc＞Vri 〉=Vrd is serious segregation
Vri＜Vrd is cement stabilized soil or silt particle
3. determine the principle that the pile concrete pouring quality is estimated.
According to the last testing result of each section of pile body, draft by following principle and estimate pile concrete pouring quality classification:
Each measuring point Vri of I class stake is all more than or equal to the Vra criterion.
The Vri of the indivedual measuring points of a certain detection section of II class stake is not less than the Vrb criterion.
The continuous a plurality of measuring points of a certain detection section of III class stake or two Vri values that detect the same measuring point of section are not less than Vrc.
The continuous a plurality of measuring points of a certain detection section of IV class stake or two value Vri that detect the same measuring point of section are less than Vrc.
4. standard and quality of concreting is monitored in real time by following requirement:
4.1 after cutting the ball concrete perfusion, remove mud that sensor surface adheres to etc. by inserting the cleaning of shaking, then conduit is returned be inserted at the bottom of, detect the pouring quality of stake base concrete.Confirm to cut ball success back and continue concrete perfusion, promote the quality of concreting that conscientiously detects and write down each section of pile body with conduit mouth;
4.2 the concrete spouting construction monitoring should make every effort to make pile body concrete quality to reach I class pile beacon standard;
4.3 when the stake of II class occurring, should encrypt measuring point, confirm that there is not more serious mass defect in pile body;
4.4 when III class or the stake of IV class occurring, should consider when the concrete fluidised form, in time pile concrete to be carried out consolidation process, and make the quality level after the processing be not less than II class stake requirement.
Pile foundation quality of concreting monitoring II
As shown in Figure 2, on conduit 4 outlet neighborings, evenly fixedly mount a, b, three sensors of c, press the character of following method definition concrete defect by align member 17:
1.a, all to be not less than Vrd be concrete disintegration for the Vri of b, c three measuring point measuring points.
2.a, any two measuring points of b, c are necking down with interior Vri less than Vrd.
3.a, the Vri of b, c three measuring points is broken pile less than Vrd all.
The size of above-mentioned concrete defect is determined by the plan-position and the absolute altitude of three sensors.
Sensor d of fixed installation on the inwall of conduit 4 outlets selects when cutting ball to show the d passage, cuts ball concrete perfusion process conduit with observation and the slurry phenomenon whether occurs returning.Cut again conduit is inserted to behind the ball at the bottom of, detect the degree of concrete displacement pile bottom sediment and mud by a, b, three measuring points of c, confirm to cut ball and whether successfully reach the degree that segregation appears in a base concrete.Concrete spouting process sensor d is if detect defective and concrete pipe laying depth when suitable, should judge problems such as catheter rupture or pipe joint be not tight to occur.
Sensor e of fixed installation on the outer wall at distance conduit outlet 2m place is used for the minimum pipe laying depth of monitored concrete.Another passage is inserted sensor f in the pore-forming by lead 3, is used to detect concrete spouting end face absolute altitude, and the difference of detected top of concrete elevation and conduit mouth absolute altitude is a pipe laying depth.When precipitation more than sensor f detects concrete spouting end face soil 11 thickness increase suddenly, can be judged as the concrete perfusion process hole phenomenon that occurs collapsing.Utilize sensor f to detect the top of concrete elevation, detect the quality of pipe laying section concrete, prevent the local segregation of short circuit pile crown and pile crown concrete, low defective such as strong with sensor e and a, b, c.
All the other are with embodiment 1.
Embodiment 3
Clear hole quality examination
As shown in Figure 3, electrical resistivity survey instrument 1 is inserted sensor 5 in the mud 13 of pore-forming 12 by lead 3, measures the content of mud 13 medium sands 14 and judges a thickness and a state of end precipitation soil 11, and the implementation step of detection is as follows:
1. cross sieve about the 0.074mm of aperture with the mud in clear hole, the pure mud of getting after being no less than 4000g and sieving is that 0 mud is standby as sand factor.Produce process and should not add water or other chemical substances in addition, guarantee pure mud except that sand factor, use the physics and the chemical property of mud identical with engineering piles.
2. discharge the outer sediment of stake when getting hole clearly, with mud in the clear water flush away sand, dry (drying) back is crossed about the 1.5mm of aperture and is sieved, and it is standby to get 4000g sand.
3. fully stir evenly the pure mud of preparation, the 1000g mud that weighs with scale is poured in the plastic cup.
4. sensor f is inserted the plastic cup center, detecting head surface sinks to about mud face 5cm, record correspondent voltage value Vs.
5. be the sand amount that to add in 2.5%, 5.0%, 7.5%, 10.0%, 20.0%, 30.0%, 40.0%, 50.0% o'clock by sand factor SL, join in the mud step by step and stir, will pop one's head in to insert to survey in the mud as 4 requirements and read and write down corresponding voltage value Vs.
6. require to do three parallel demarcation as 5.
7. should be in three parallel calibration process, the viscosity and the proportion of corresponding mud when measuring or calculating sand factor at different levels.
8. get three demarcation results and average, and draw the calibration curve of sand factor SL and magnitude of voltage Vs.
9. according to the sand factor that detects and the relation of corresponding voltage value, viscosity and proportion.According to requirement and self construction equipment and the managerial skills about clear hole quality such as construction technique normalizing, the sand factor of correspondence when determining suitable clear hole standard and being defined as precipitation.
10. will pop one's head in and progressively put into the mud of pore-forming, the Vsi of record different depth checks in its sand factor by calibration curve.Should conscientiously measure and write down the situation of change of actual measurement Vs at the bottom of the hole with the 10cm step pitch.Probe is transferred process when Vs suddenlys change, and the absolute altitude of corresponding position is drafted to precipitating native end face absolute altitude.When precipitating native end face absolute altitude and whole hole at the bottom of the stake difference of absolute altitude be the precipitation soil thickness.
This method is in other application of pore-forming and clear hole process:
1. settling rate is measured and is precipitated soil thickness and estimates
Left standstill 60 minutes behind the clear hole, precipitation soil thickness h0, h30 and the h60 of correspondence at the bottom of the stake when measuring 0 minute, 30 minutes and 60 minutes respectively as 10 methods are calculated as follows settling rate:
Δh＝(h60-h0)
Utilize Δ h to estimate the precipitation soil thickness that may occur when Kong Houzhi cuts the ball concrete perfusion clearly:
ht＝h0+Δh·t≤[h]
Its value should be less than standard and designing requirement, otherwise should strengthen clear hole or manage to reduce the time of cutting ball work; Or take measures to improve the outstanding sand ability of mud.
2. contain the analysis of sand slope
Pore-forming and clear hole process, by detecting the sand factor of different depth in the hole, calculate the slope that sand factor changes in the hole:
Kh＝(SL2-SL1)
2/(H2-H1)
And relatively sand factor is understood suspension and the distribution of sand in the stake hole along the line style of the distribution curve of hole depth, and the deslagging ability when helping to analyze pore-forming and clear hole is used for guiding construction.
3. the hole that collapses is judged
Clear hole or concrete spouting process, detected precipitation soil thickness increases suddenly, and feeling to pop one's head in by cable directly contacts on the harder relatively sediment, can be judged as the hole that collapses to occur.
All the other are with embodiment 1.
Embodiment 4
The sound detecting pipe water quality detection
As shown in Figure 4, behind the pile foundation concrete perfusion, promptly detect the water quality of sound detecting pipe, according to V with electrical resistivity survey instrument 1
Slurry＞V
Mud＞V
WaterPhenomenon.Sensor 5 is inserted respectively in the coupling water 16 of sound detecting pipe 15, it is the lower constant of voltage that sound detecting pipe is the detected electrical measurement value of clear water, if bleed cement paste or mud 13 in the sound detecting pipe, respective change can take place the electrical measurement value.The difference of actual measurement mud end face absolute altitude and pipe laying bottom surface absolute altitude for precipitation highly, precipitate that sensor fails to lay down when serious.When actual measurement precipitated height greater than 1/2 ultrasonic transducer height, sound detecting pipe should be done hole processing clearly.If detect when bleeding cement paste pigging immediately, prevent that cement paste from solidifying the back plugging.
All the other are with embodiment 1.
Handle pile concrete defective I with high-pressure injection method
As shown in Figure 5, the nozzle 9 that will be connected Grouting Pipe 8 exits by Grouting Pipe 8 is presented to the predetermined position of pile body segregating concrete mixture 7, with the pressure of about 20Mpa cement paste 10 is penetrated from nozzle 9, make cement paste 10 and segregating concrete mixture 7 and precipitate native 11 etc. to mix.Can cooperate simultaneously utilize conduit to insert to shake, methods such as wing plate stirring that steering nozzle utilizes sensor installation stir it, concrete perfusion displacement and disperse method such as segregating concrete mixture to carry out consolidation process.Processing procedure after extremely the quality of the segregating concrete mixture of reinforcing reaches requirement, continues concrete perfusion by normal process by the method encryption detection of rotary guide pipe.
When concrete defect appears at casing and goes into the rock section, can adopt big churning pressure, make that churning pressure is unlikely to cause serious reaming but take an examination in general location to consider.
Adopt this method should be equipped with equipment such as high pressure slurry pump, slurry mixing tank, pulp storing barrel.
All the other are with embodiment 1.
Handle pile concrete defective II with high-pressure injection method
As shown in Figure 5, nozzle 9 directly is fixedly mounted on the neighboring of conduit 4 outlets, Grouting Pipe 8 adopts high pressure rubber hose, every the colligation of the 2m left and right sides on conduit, when finding the pile concrete segregation, conduit mouth is inserted to defective concrete below, begins segregating concrete mixture 7 to be carried out consolidation process with cement paste.
All the other are with embodiment 5.
Handle the pile concrete defective with the gas-lift slag discharging method
As shown in Figure 6, occur adopting this law to handle when major defect, broken pile, filling process are collapsed hole etc. when pile body.
1. if broken pile occurs, mud and segregating concrete mixtures 7 in the conduit 4 are emitted on more than the broken pile face, and then conduit is inserted in the concrete below the broken pile face by sensor d monitoring.
2. extract the concrete of sediment 11, mud interlayer and interlayer end face from top to down out with gas lift method.Take out the slag process and should note replenishing mud, keep head height to boring.
3. handle local serious segregating concrete with gas lift method, also should utilize mud to do concrete and sediment that carrier extracts segregation from top to down,
4. again during concrete perfusion, should utilize conduit to insert shake, concrete be flowed tamp the position that is extracted, and detect the construction quality of concrete mix 6.
Adopt this law scene should have equipment such as air compressor machine, appendix 25, scum pipe 24.
All the other are with embodiment 2.
Use the electric exploring method monitoring quality of pipe sinking poured pile
Tube-sinking cast-in-situ pile 19 is a kind of quick construction, economic and practical stake type, but this quality of pile is stable inadequately, is easy to generate necking down, quality problems such as broken pile.As shown in Figure 7,, adopt the precast reinforced concrete pile point for improving the construction quality of tube-sinking cast-in-situ pile, at the sword pin place thickened steel-tube thickness of stake pipe 18 outlets, and otch fixed installation sensor 5, be connected to the electrical resistivity survey instrument by lead 3.For guardwire is not damaged in the concrete perfusion process, lead 3 passes in the shaped steel that is fixed on stake pipe 18 inboards, draws outside the pipe below 18 charging apertures are managed in stake.
Earlier pour into the high concrete of 1.5m as bottom concrete in pipe before the immersed tube, whether each soil layer excess pore water of immersed tube process monitoring and mud enter in the pipe, if having water, mud to enter in the pipe, should improve the bottom concrete influx height.Tube drawing concrete perfusion process should conscientiously be monitored and be guaranteed that stake pipe outlet section has concrete to exist, and could continue tube drawing, otherwise should stop to pull out anti-inserting and vibration, and concrete is fallen.When detecting a stake pipe outlet concrete mix and emanate because of underground excess pore water infiltration, should come the balance excess pore water pressure by improving pipe inner concrete height, manage the inner concrete excessive height but should not make.2m and 3m place respectively add a sensor in pipe, to help detection and control valve inner concrete influx height between the 2m to 3m.
All the other are with embodiment 1.
The CFG construction monitoring
As shown in Figure 7, adopt composite foundation and CFG stake and plain concrete pile, have remarkable economic efficiency, be widely used, quality problems are more as tube-sinking cast-in-situ pile 19, by manage the method that sensor 5 is buried in 18 exits underground in stake, the pouring quality that is used for monitored concrete mixture and mixture comes control construction quality.
All the other are with embodiment 8.
Underground undercurrent detects and prevents and treats method
Leave standstill certain hour behind the clear hole,, the dielectric of local mud is changed so that underground undercurrent 21 enters and washes away in the pore-forming or dilute mud 13.As shown in Figure 3, sensor 5 is inserted in the mud 13 of pore-forming 12 by lead 3, when the flowing to of the underground undercurrent of the unknown, should evenly arrange 4 survey groups apart from the about 10-20cm bilateral symmetry of week stake place, the dielectric of continuous measurement pore-forming 12 mud, emphasis detects the special geology location that undercurrent may occur, when the magnitude of voltage of measuring obviously reduces, get rid of sensor cover and may be stained with clod, should judge the underground undercurrent existence that has.By analyzing the rule that mud electrical measurement value in inner plane position, hole changes, judge the flow direction of underground undercurrent.
As shown in Figure 8, when finding that there is underground undercurrent in the pile body location, at this point section and up and down general 22 neighborings of reinforcing bar of each 1m scope correspondence add a steel casing as water-proof jacket 23.The diameter of steel casing is slightly less than design stake footpath, so that underground undercurrent is not subjected to underground undercurrent short-term and long-term erosion from stake week effluent mistake with the protection pile concrete.For the pile foundation that underground undercurrent occurs, should consider its influence to bearing capacity of pile foundation, it is long to increase stake in case of necessity.
All the other are with embodiment 1.
Claims (10)
1. the method for quality monitoring of electric exploring method pile foundation construction and reinforcing technique, it is characterized in that electrical resistivity survey instrument (1) is mounted on the sensor of being made up of fixed electrode on the neighboring of conduit (4) outlet in the pore-forming (12) of pile foundation (2) (5) by lead (3), detect the character and the distribution of concrete mix (6) in the pore-forming (12), segregating concrete mixture (7), mud (13), these different mediums of sand (14), reach the purpose that the pile foundation construction quality is detected and monitors.
2. the method for electric exploring method pile foundation construction according to claim 1 quality monitoring and reinforcing technique is characterized in that sensor (5) is installed on the medial surface of conduit (4) outlet the quality of the concrete mix (6) in the detected catheter (4).
3. the method for electric exploring method pile foundation construction according to claim 1 quality monitoring and reinforcing technique is characterized in that sensor (5) is installed in conduit (4) apart from 2 meters, outlet top, is used for the minimum pipe laying depth of concrete of monitoring tube (4).
4. the method for electric exploring method pile foundation construction according to claim 1 quality monitoring and reinforcing technique, it is characterized in that sensor (5) is installed on the sword pin or medial surface of stake pipe (18) mouth of pipe, be used for detecting the pouring quality of concrete mix (6) of the pore-forming (12) of tube-sinking cast-in-situ pile (19).
5. the method for electric exploring method pile foundation construction according to claim 1 quality monitoring and reinforcing technique, it is characterized in that sensor (5) directly being inserted in the mud (13) of pore-forming (12) by lead (3), measure the content of mud (13) medium sand (14), the situation of change of precipitation soil (11) medium sand content at the bottom of the sand factor of computation of mud (13) and the analysis and judgement stake.
6. the method for electric exploring method pile foundation construction according to claim 1 quality monitoring and reinforcing technique, it is characterized in that sensor (5) directly being inserted in the coupling water (16) of the pre-buried sound detecting pipe (15) of pile foundation (2) by lead (3), measure the water quality of coupling water (16), judge the mud (13) that whether bleeds in the sound detecting pipe (15).
7. according to the method for claim 1 described electric exploring method pile foundation construction quality monitoring and reinforcing technique, it is characterized in that monitoring the consolidation process process of segregating concrete mixture (7) and detecting the consolidation process effect by being installed in sensor (5) on conduit (4) the outlet neighboring.
8. the method for electric exploring method pile foundation construction according to claim 7 quality monitoring and reinforcing technique, it is characterized in that by Grouting Pipe (8), the nozzle (9) that will be connected Grouting Pipe (8) exit is presented to the predetermined position of pile body segregating concrete mixture (7), with pressure cement paste (10) is penetrated from nozzle (9), cement paste (10) and segregating concrete mixture (7), precipitation soil (11), mud (13) are mixed.
9. the method for electric exploring method pile foundation construction according to claim 1 quality monitoring and reinforcing technique, after it is characterized in that certain hour is left standstill in the hole clearly, sensor (5) is inserted in the mud (13) of pore-forming (12) by lead (3), measure mud (13) whether because of the washing away, dilute and cause its resistance or resistivity to change of underground undercurrent (21), judge the existence of underground undercurrent (21).
10. the method for electric exploring method pile foundation construction according to claim 9 quality monitoring and reinforcing technique; it is characterized in that existing the location of underground undercurrent (21) at pore-forming (12); on the neighboring of reinforcing cage (22), add a water-proof jacket (23); by the buffer action of water-proof jacket (23), the protection pile concrete is avoided the erosion of underground undercurrent (21).
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| CNB031268587A CN1296572C (en) | 2003-06-16 | 2003-06-16 | Method for monitoring pile foundation construction quality and reinforcing pile foundation by electric exploring method |
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| CNB031268587A CN1296572C (en) | 2003-06-16 | 2003-06-16 | Method for monitoring pile foundation construction quality and reinforcing pile foundation by electric exploring method |
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| CN1566544A CN1566544A (en) | 2005-01-19 |
| CN1296572C true CN1296572C (en) | 2007-01-24 |
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Families Citing this family (16)
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| JP4827239B2 (en) * | 2006-01-17 | 2011-11-30 | 株式会社ケット科学研究所 | Defect detection / filling degree measuring apparatus for concrete during placing and method for detecting and filling the defect |
| CN101592588B (en) * | 2009-06-23 | 2012-01-04 | 中国海洋石油总公司 | Pile soil interaction mechanism testing device for riser |
| CN102127917A (en) * | 2010-12-03 | 2011-07-20 | 中国民航大学 | Low-strain testing device for detecting integrity of ultralong bored concrete pile |
| CN103437358A (en) * | 2013-09-13 | 2013-12-11 | 杭州银博交通工程材料有限公司 | Concrete pouring control system and method for cast-in-place pile |
| CN105275005A (en) * | 2015-10-16 | 2016-01-27 | 浙江工业大学 | Method for detecting post grouting quality of pile foundation through electric method well logging system |
| KR101638619B1 (en) * | 2015-12-03 | 2016-07-11 | 한국지질자원연구원 | Grouting monitoring method used resistivity |
| CN106013160B (en) * | 2016-06-29 | 2018-07-20 | 江苏中海昇物联科技有限公司 | Cast-in-place concrete pile influx height control device and its application method |
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| CN108107193A (en) * | 2017-12-15 | 2018-06-01 | 哈尔滨工业大学 | A kind of test device and method of fresh concrete education resistance energy |
| CN108086323A (en) * | 2018-02-02 | 2018-05-29 | 北京市政建设集团有限责任公司 | A kind of concrete construction control method |
| CN110230327B (en) * | 2019-04-02 | 2022-04-01 | 中建港航局集团有限公司 | Real-time monitoring system and method for sand pile construction quality |
| CN110130419B (en) * | 2019-05-29 | 2021-02-02 | 华侨大学 | Cement mixing pile construction quality detection device and method |
| CN114622605A (en) * | 2022-03-11 | 2022-06-14 | 国网甘肃省电力公司经济技术研究院 | Resistance tomography monitoring device and monitoring method for cast-in-place concrete pile |
| CN117091497B (en) * | 2023-10-16 | 2024-01-16 | 中铁大桥局集团有限公司 | Device and method for dynamically monitoring concrete slurry interface of bored pile |
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| CN1566544A (en) | 2005-01-19 |
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