CN108427142A - A kind of prefabricated pile stake bottom CAVE DETECTION system and method - Google Patents
A kind of prefabricated pile stake bottom CAVE DETECTION system and method Download PDFInfo
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- CN108427142A CN108427142A CN201810090310.5A CN201810090310A CN108427142A CN 108427142 A CN108427142 A CN 108427142A CN 201810090310 A CN201810090310 A CN 201810090310A CN 108427142 A CN108427142 A CN 108427142A
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- 238000001514 detection method Methods 0.000 title claims abstract description 59
- 238000000034 method Methods 0.000 title abstract description 9
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- 230000003028 elevating effect Effects 0.000 claims abstract description 4
- 230000015572 biosynthetic process Effects 0.000 claims description 4
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- 238000007689 inspection Methods 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 241001146702 Candidatus Entotheonella factor Species 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
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- 238000010009 beating Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
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- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
- G01V1/28—Processing seismic data, e.g. for interpretation or for event detection
- G01V1/30—Analysis
- G01V1/306—Analysis for determining physical properties of the subsurface, e.g. impedance, porosity or attenuation profiles
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
- G01N29/045—Analysing solids by imparting shocks to the workpiece and detecting the vibrations or the acoustic waves caused by the shocks
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Abstract
The present invention relates to a kind of prefabricated pile stake bottom CAVE DETECTION system and methods.Detection system includes piling machine, prefabricated pile and detection device, and piling machine includes fuselage, pile frame and pile hammer, and pile frame is included in the guide rail of vertical direction extension, and pile hammer makees elevating movement along guide rail；Prefabricated pile includes pile body and the pile top that is connect with pile body, and prefabricated pile is located at below pile hammer, for carrying the hammer force of pile hammer to generate elastic incidence wave in region soil layer to be detected；Detection device includes the wave detector for being installed in pile top, detector and the call wire for being connected to wave detector and detector, wave detector acts on the back wave to be formed for detecting the elastic incidence wave of reception in the geologic structure of region soil layer to be detected, and detector is for analyzing back wave.Prefabricated pile stake provided by the invention bottom CAVE DETECTION system and method can ensure the energy of elastic incidence wave in the case where not needing additional excitational equipment, and the problems such as can verify a bottom geology solution cavity situation, effectively prevent sliding pile, broken pile.
Description
Technical field
The present invention relates to the technical fields of architectural engineering pile foundation construction, more particularly to a kind of prefabricated pile stake bottom CAVE DETECTION
System and method.
Background technology
Karst lie concealed solution cavity constitute karst foundation usually cause foundation bearing capacity deficiency, differential settlement,
The foundation deformations problems such as base is slided and collapsed.Currently, pile foundation is very universal one kind used in the engineering construction of karst area
Base form carries out pile foundation construction in the case where not verifying a bottom solution cavity and developing, if dealing with improperly, sliding pile easily occurs, breaks
The major accidents such as stake, the hole that collapses, surface subsidence, burying, surrounding buildings cracking, therefore the karst foundation stable problem containing latent solution cavity
Even more become the outstanding problem in engineering construction.
Solution cavity area, when pile-type use prefabricated pile when, due to current detection method mostly investigative range is limited, precision not
It is high, work is complicated and interference is big, if a bottom geology solution cavity situation cannot be verified, it is most likely that can there is a situation where sliding pile, broken piles.
Invention content
Based on this, it is necessary to for prefabricated pile is used when solution cavity area carries out pile foundation construction, due to current detection method
Defect, and the problem of a bottom solution cavity situation cannot be verified, lead to sliding pile, broken pile, a bottom geology solution cavity can be verified by providing one kind
The prefabricated pile stake bottom CAVE DETECTION device and method of situation.
A kind of prefabricated pile stake bottom CAVE DETECTION system, including piling machine, prefabricated pile and detection device, the piling machine include machine
Body, the pile frame being connect with the fuselage and pile hammer, the pile frame are included in the guide rail of vertical direction extension, which is installed in this
Guide rail, and make elevating movement along the guide rail；The prefabricated pile includes pile body and the pile top that is connect with the pile body, which is located at should
Below pile hammer, the hammer force for carrying the pile hammer, to generate elastic incidence wave in region soil layer to be detected；The detection fills
Set wave detector, detector and the call wire for being connected to the wave detector and the detector including being installed in the pile top, the detection
Device for detect reception the elasticity incidence wave act on the back wave to be formed in the geologic structure of region soil layer to be detected, the detector
For being analyzed the back wave to obtain back wave analysis chart.
Above-mentioned prefabricated pile stake bottom CAVE DETECTION device thumps prefabricated pile so that prefabricated by using the pile hammer of piling machine
During stake is sunk to square soil layer under stake, excite elastic incidence wave to region soil layer to be detected, when elastic wave encounters solution cavity
When geologic structure, back wave is passed back, by being sent to detector through call wire after being received positioned at the detection of the wave detector of pile top, then through inspection
Back wave analysis chart is obtained after surveying device analysis, then can determine whether to whether there is solution cavity in the geologic structure of region soil layer to be detected.This
Detection system is simple in structure, does not need additional excitational equipment, ensures the energy of elastic incidence wave, and can verify bottom geology
Solution cavity situation, the problems such as effectivelying prevent sliding pile, broken pile.
Above-mentioned pile body is hollow pile body in one of the embodiments, and above-mentioned wave detector is contained in the hollow pile body, above-mentioned
Call wire passes through the hollow pile body that above-mentioned wave detector is made to be connect with above-mentioned detector.
Above-mentioned detector is seismic detector in one of the embodiments,.
Above-mentioned prefabricated pile stake bottom CAVE DETECTION system further includes pile cover in one of the embodiments, and above-mentioned pile cover lid is set
At the top of the above-mentioned pile body, hammer force is simultaneously transferred to above-mentioned prefabricated pile by impact force for carrying above-mentioned pile hammer.
A kind of prefabricated pile stake bottom CAVE DETECTION method, the detection method include the following steps：1) prefabricated pile is inserted into and waits visiting
Region soil layer is surveyed to predeterminated position, and starts piling machine；2) pile hammer is utilized to hammer above-mentioned prefabricated pile, in band search coverage soil
Layer generates elastic incidence wave；3) it utilizes wave detector detection to receive elastic incidence wave to act in the geologic structure of region soil layer to be detected
The back wave of formation, and it is sent to detector；4) detector is utilized to reflection wave analysis and obtain back wave analysis chart；5) basis
Back wave analysis chart judges whether solution cavity.
Above-mentioned prefabricated pile stake bottom CAVE DETECTION method thumps prefabricated pile so that prefabricated by using the pile hammer of piling machine
During stake is sunk to square soil layer under stake, excite elastic incidence wave to region soil layer to be detected, when elastic wave encounters solution cavity
When geologic structure, back wave is passed back, by being sent to detector through call wire after being received positioned at the detection of the wave detector of pile top, then through inspection
It surveys in the geologic structure that can determine whether region soil layer to be detected after device is analyzed and whether there is solution cavity.This detection system is simple in structure, no
Additional excitational equipment is needed, ensures the energy of elastic incidence wave, and a bottom geology solution cavity situation can be verified, effectively prevent sliding
The problems such as stake, broken pile.
Above-mentioned steps further include step in one of the embodiments,：Repeat the above steps 2)~step 5), until above-mentioned
Prefabricated pile stake bottom goes out the geologic structure of region soil layer to be detected to installation site or judged, and there are solution cavities.
Above-mentioned detector is seismic detector in one of the embodiments,
Above-mentioned back wave analysis chart includes amplitude versus time graph and time curve in one of the embodiments,.
Description of the drawings
Fig. 1 is prefabricated pile stake bottom CAVE DETECTION system schematic in one embodiment of the invention；
After Fig. 2 is sinking a distance after Pile Hammer Impact prefabricated pile in prefabricated pile stake bottom CAVE DETECTION system shown in Fig. 1
Schematic diagram；
Fig. 3 is the detection principle schematic diagram that prefabricated pile stake bottom CAVE DETECTION system is used in one embodiment of the invention；
Fig. 4 is the amplitude time schematic diagram obtained using detector in one embodiment of the invention.
Specific implementation mode
To facilitate the understanding of the present invention, below with reference to relevant drawings to invention is more fully described.In attached drawing
Give the preferred embodiment of the present invention.But the present invention can realize in many different forms, however it is not limited to herein
Described embodiment.Keep the understanding to the disclosure more saturating on the contrary, purpose of providing these embodiments is
It is thorough comprehensive.
Unless otherwise defined, all of technologies and scientific terms used here by the article and belong to the technical field of the present invention
The normally understood meaning of technical staff is identical.Used term is intended merely to description tool in the description of the invention herein
The purpose of the embodiment of body, it is not intended that in the limitation present invention.Term as used herein " and/or " include one or more phases
Any and all combinations of the Listed Items of pass.
As depicted in figs. 1 and 2, the prefabricated pile stake bottom CAVE DETECTION system 100 that one embodiment of the invention provides, including piling
Machine 10, prefabricated pile 20 and detection device 30.
Piling machine 10 includes that fuselage 11, the pile frame 12 being connect with fuselage 11 and pile hammer 13, pile frame 12 are included in vertical side
To the guide rail 121 of extension, pile hammer 13 is installed in guide rail 121, and makees elevating movement along guide rail 121；Prefabricated pile 20 includes pile body
21 and the pile top 22 that is connect with pile body 21, prefabricated pile 20 is located at 13 lower section of pile hammer, the hammer force for carrying pile hammer 13, with
Elastic incidence wave is generated in region soil layer to be detected；
Detection device 40 includes being installed in the wave detector 41, detector 42 and tie geophone 41 and detector 42 of pile top 22
Call wire 43, wave detector 41, which is used to detect, to be received elasticity incidence wave and acts on being formed in geologic structure with search coverage soil layer
Back wave, detector 42 is for analyzing the back wave to obtain back wave analysis chart.
Specifically, the pile top of prefabricated pile 20 is downward into underground layer, and a distance of sinking under external force, pile hammer 13
It is located in the top of prefabricated pile 20, when 13 20 top of driven precast pile of pile hammer, prefabricated pile 20 is sunk to square soil layer under stake
In the process, excite elastic incidence wave to 20 surrounding soil layer of prefabricated pile and to necromancer Es-region propagations under stake, elastic incidence wave can arrive
The soil layer region reached includes region soil layer to be detected.
Above-mentioned prefabricated pile stake bottom CAVE DETECTION system 100 thumps prefabricated pile 20 by using the pile hammer 13 of piling machine 10,
So that during prefabricated pile 20 is sunk to square soil layer under stake, excites elastic incidence wave to region soil layer to be detected, work as elasticity
When incidence wave encounters solution cavity geologic structure, pass back wave back, by positioned at the wave detector 41 of pile top 22 detection receive after through call wire
43 are sent to detector 42, then device 42 obtains back wave analysis chart after analyzing after testing, can determine whether to wait for according to back wave analysis chart
It whether there is solution cavity in the geologic structure of search coverage soil layer.Detection system 100 is simple in structure for this, does not need additional exciting sets
It is standby, the problems such as ensureing the energy of elastic incidence wave, and a bottom geology solution cavity situation can be verified, effectively prevent sliding pile, broken pile.
In one embodiment, prefabricated pile 20 is vertically placed on immediately below pile hammer 13.At this point, pile hammer is in vertical direction
Upper hammer drops down onto prefabricated pile 20 so that prefabricated pile 20 can more reliably excite elastic incidence wave, and accurately quick along depth direction
It propagates downwards on ground.In other embodiments, pile hammer 13 oblique can also be hammered to extremely inclined prefabricated pile 20.
In one embodiment, prefabricated pile stake bottom CAVE DETECTION system 100 further includes pile cover 50, and pile cover 50 is covered on pile body
21 tops, for carrying 13 impact force of pile hammer and power being transferred to prefabricated pile 00.Pile cover 50 directly bears the hammer of pile hammer 13
Beat, and power can also be relatively evenly transferred to prefabricated pile 20 by pile cover 50, can be beaten by pile hammer 13 to avoid prefabricated pile 20 and
It is impaired.
In one embodiment, the pile body 21 of prefabricated pile 20 is hollow pile body, and wave detector 41 is contained in hollow pile body, is conducted
Line 43 passes through hollow pile body that wave detector 41 is made to be connect with detector 42.Using hollow pile body, prefabricated pile 20 itself can not influenced
In the case of performance, further guard space is provided for wave detector 41 and be that call wire 43 provides protection, avoid it in pile sinking
It is damaged in the process, the back wave that wave detector 41 detects is caused to be not transferred to detector 42.
It should be appreciated that detector 42 is positioned over ground, for making the staff in ground handling check and analyze
Testing result.
In one embodiment, the pile body of prefabricated pile 20 is concrete structure, can improve strength grade, avoids beating in use
During stake machine 10 beats prefabricated pile 20, prefabricated pile 20 is made to damage.
Further, the pile top 22 of prefabricated pile 20 can be the pyramid type pile top of concrete formation, or use steel
The cross type pile toe or integrally formed cross type pile toe that plate is welded, pile top 22 can reduce broken pile probability, increase
To the penetration capacity of soil layer when stake is beaten.In other embodiments, pile top 22 or other shapes, do not limit herein
It is fixed.
Further, using integrally formed cross type pile toe 22 in present embodiment comprising with pile body 21
The bottom plate of connection and the cross type pile tip being connect with bottom plate.
Specifically, wave detector 41 is installed in the bottom plate of pile top 22, and back to 22 settings of pile top.The circumferential ruler of wave detector 41
The radial dimension of the very little hollow pile body for being less than prepackage stake 20 so that after pile top 22 is connect with pile body 21, wave detector 41 can be by
It is contained in hollow pile body, avoids being influenced or being damaged by extraneous factor.In other embodiments, pile top 22 can also be positioned over
Other positions are not limited thereto.
In one embodiment, wave detector 41 is bonded in pile top 22, and specifically, wave detector 41 is bonded on bottom plate, at it
In his embodiment, wave detector 41 can also be installed in pile top 22 with screw threads for fastening or other modes mechanical means.
In one embodiment, piling machine 10 be diesel pile driver, in other embodiments or hydraulic pile driver,
Single-acting steam hammer or other kinds of piling machine 10.
Above-mentioned prefabricated pile stake bottom CAVE DETECTION system 100 can carry out stake when carrying out pile foundation construction to multiple prefabricated piles 20
Bottom CAVE DETECTION effectively avoids failing to judge test leakage and the problems such as sliding pile caused by solution cavity, broken pile occur.
Above-mentioned prefabricated pile stake bottom CAVE DETECTION system 100, can detect with the sinking of prefabricated pile 20 in wide range
Stake bottom geology solution cavity situation, keeps result of detection more accurate.
In one embodiment, detector 42 is seismic detector.Seismic detector can convert the signal transmitted from wave detector 41
At analog or digital signal, statistics and analysis is being carried out, is obtaining the data that may determine that whether bottom has solution cavity.Specifically, it examines
Survey 42 bit digital seismic detector of device, continuous curve can be obtained with digital record in digital seismograph, directly analytical judgment or
It recycles other operations to obtain desired analysis data again to be judged.
Based on above-mentioned prefabricated pile stake bottom CAVE DETECTION system 100, the present invention also provides a kind of prefabricated pile stake bottom CAVE DETECTIONs
Method includes the following steps：
S10：Prefabricated pile 20 is inserted into region soil layer to be detected to predeterminated position, and starts piling machine 10；
S20：Using 13 driven precast pile 20 of pile hammer, to generate elastic incidence wave in region soil layer to be detected；
S30：The elastic incidence wave of reception is detected using wave detector 41 to act on being formed in the geologic structure of region soil layer to be detected
Back wave, and be sent to detector 42；
S40：To reflection wave analysis and back wave analysis chart is obtained using detector 42；
S50：Solution cavity is judged whether according to back wave analysis chart.
To further understand above-mentioned detection method, the detection principle of the present invention is carefully stated below：
It should be appreciated that prefabricated pile 20 is inserted into region soil layer to be detected to predeterminated position, for example aforementioned institute of the predeterminated position
20 pile top 22 of prefabricated pile said downward, and the soil depth position that sinking a distance is reached under external force, the position
It conveniently subsequently can sustainedly and stably drive piles.
As shown in Figures 2 and 3, when thumping prefabricated pile 20 using the pile hammer 13 of piling machine 10 so that prefabricated pile 20 is to stake
During the soil layer of beneath side is sunk to, elastic incidence wave is excited to propagate to 20 surrounding soil layer of prefabricated pile and downwards, when stake bottom geology
There are apparent wave impedance differential boundaries, the i.e. factors such as different soil, architectonic mass density, elasticity modulus to occur for construction
Variation, that is, in the interface of different transfer media, will produce transmission and reflection.The wave impedance of interface both sides and medium
The spread speed of density, wave in the medium is positively correlated, the variation of interface both sides wave impedance, is had to the energy transmission of wave very big
It influences.By elastic wave in the medium propagate its path, oscillation intensity and waveform by with by medium structure and bullet
Property the different of property generate variation, the 40 wave number evidences received are connect according to wave detector, then its changing rule is analyzed by detector 42,
It is concluded that the property of earth formation and architectonic form, stratum or rock.
Under normal circumstances, the dynamic characteristic and kinematics character shown from reflection wave profile can analyze solution cavity
There are situations.
As shown in figure 4, in one embodiment, when detector 42 is seismic detector, when back wave analysis chart includes amplitude
Between scheme.Amplitude versus time graph can show the dynamic characteristic of back wave, and back wave dynamic characteristic and other ground of solution cavity are situated between
Matter has apparent difference.
Further, Cave is divided into cavity and fills empty, water-filling or part water-filling, filling or part filling sedimentation object three
Major class.No matter that is a kind of, and the density of charges, velocity of wave are all much smaller more than country rock (generally limestone), therefore both sides wave resistance
Resistanceization is big.
Specifically, when elastic wave encounters the interfaces Dong Ding full of air, it is believed that the density approach 0 of air, wave impedance pole
Small, whole energy will be reflected, and the phase difference of elastic wave and back wave is 180 degree at this time, " half-wave loss " phenomenon occurs.Even if
When having loose ground or rubble filler in solution cavity, under conditions of solution cavity top reflective interface is negative poisson's ratio interface, elastic wave
Negative reflection occurs.Case above reflects wave profile on amplitude versus time graph and shows the discontinuous phenomenon of phase.
When having water, loose ground or rubble filler in solution cavity, because the absolute value of wave impedance more large amplitude is bigger, wave resistance
The anti-smaller amplitude of absolute value is smaller, and at middle part, filled media density, velocity of wave are small all than around, and wave impedance is small, so in amplitude
Wave profile is reflected on time diagram shows weak tendency back wave；
In two endpoints at solution cavity top reflective interface due to being lithology catastrophe point, two diffracted waves are generated, at endpoint
It is connected with back wave, gradually decays to both sides energy.Its amplitude is decayed rapidly with the increase of wavefront distance.Amplitude only has at endpoint
The half of back wave, in field section, this half range feature is not usually particularly evident, but both ends occur certain radian
, raised arch.
The vibration of solution cavity base point is the superpositing vibration that the propagation of disturbance of wavefront surface each point around it is formed to the point,
And it is internal or without medium, or have the weak medium of absorption coefficient greatly, energy loss is more, and base point vibrational energy is than two
Bian Yao little, amplitude ratio both sides same layer echo amplitude are slightly smaller.
In one embodiment, back wave analysis chart further includes time curve.Time curve can show the fortune of back wave
It is dynamic to learn feature.
Specifically, time curve includes time distance curve of reflection wave and diffracted wave time curve, time distance curve of reflection wave with around
Ejected wave is equally all hyperbola, and after corrected equal processing, time distance curve of reflection wave lineups reflect the shape of reflecting interface substantially
State, and diffracted wave time curve still has larger bending shape.The minimum place of diffracted wave time curve is reflecting interface endpoint, instead
It will appear the waveform that both sides have approximate Double curve radian to reflect on ejected wave section.
The back wave of solution cavity bottom mainly exists to surround in the form of diffraction stack, propagate needed for travelling when to be more than both sides,
Reflection on time section is that lineups are recessed.
In one embodiment, above-mentioned detection method further includes step：
Repeat the above steps S20 step S50, until prefabricated pile 20 is installed in place or judges region soil layer to be detected
There are solution cavities for geologic structure.Pile sinking is shallower when beginning, and the solution cavity back wave unobvious of record go deep into wave detector 41 with pile sinking
It is become apparent closer to detection apart from solution cavity, by analyzing back wave analysis chart, a bottom geological condition can be obtained.
It should be understood that ground makes, it refers to the prefabricated pile 20 after piling that above-mentioned prefabricated pile 20, which is installed in place, until required soil layer is deep
Position where after degree.
In one embodiment, the accurate data obtained according to back wave analysis chart may determine that or be computed judgement solution cavity
Position, size and medium situation provide construction location reference for the follow-up pile foundation construction that further effectively carries out.
Each technical characteristic of embodiment described above can be combined arbitrarily, to keep description succinct, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, it is all considered to be the range of this specification record.
Several embodiments of the invention above described embodiment only expresses, the description thereof is more specific and detailed, but simultaneously
It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art
It says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the protection of the present invention
Range.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (8)
1. a kind of prefabricated pile stake bottom CAVE DETECTION system, which is characterized in that including：
Piling machine, including fuselage, the pile frame that is connect with the fuselage and pile hammer, the pile frame are included in vertical direction extension
Guide rail, the pile hammer is installed in the guide rail, and makees elevating movement along the guide rail；
Prefabricated pile, including pile body and the pile top that is connect with the pile body, the prefabricated pile is located at below the pile hammer, for holding
The hammer force for carrying the pile hammer, to generate elastic incidence wave in region soil layer to be detected；
Detection device, including be installed in the wave detector of the pile top, detector and be connected to the wave detector and the detection
The call wire of device, the wave detector are used to detect the geologic structure effect for receiving the elastic incidence wave in region soil layer to be detected
The back wave of formation, the detector is for analyzing the back wave to obtain back wave analysis chart.
2. prefabricated pile stake according to claim 1 bottom CAVE DETECTION system, which is characterized in that the pile body is hollow pile
Body, the wave detector are contained in the hollow pile body, the call wire pass through the hollow pile body make the wave detector with it is described
Detector connects.
3. prefabricated pile stake according to claim 1 bottom CAVE DETECTION system, which is characterized in that the detector is earthquake
Instrument.
4. prefabricated pile stake according to claim 1 bottom CAVE DETECTION system, which is characterized in that prefabricated pile stake bottom solution cavity
Detection system further includes pile cover, and the pile cover is covered at the top of the pile body, and the hammer force for carrying the pile hammer simultaneously will
Hammer force is transferred to the prefabricated pile.
5. a kind of prefabricated pile stake bottom CAVE DETECTION method, which is characterized in that include the following steps：
1) prefabricated pile is inserted into region soil layer to be detected to predeterminated position, and starts piling machine；
2) pile hammer driven precast pile is utilized, to generate elastic incidence wave in region soil layer to be detected；
3) it utilizes wave detector detection to receive elastic incidence wave and acts on the back wave to be formed in the geologic structure of region soil layer to be detected,
And it is sent to detector；
4) detector is utilized to reflection wave analysis and obtain back wave analysis chart；
5) solution cavity is judged whether according to back wave analysis chart.
6. prefabricated pile stake according to claim 5 bottom CAVE DETECTION method, which is characterized in that the detection method further includes
Step：
Step 2)~step 5) is repeated, until the prefabricated pile is installed in place or judges the geology knot of region soil layer to be detected
There are solution cavities for structure.
7. prefabricated pile stake according to claim 5 or 6 bottom CAVE DETECTION method, which is characterized in that the detector is ground
Shake instrument.
8. prefabricated pile stake according to claim 5 or 6 bottom CAVE DETECTION method, which is characterized in that the reflection wave analysis
Figure includes amplitude versus time graph and time curve.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116752528A (en) * | 2023-08-17 | 2023-09-15 | 中建三局集团华南有限公司 | Pile driving construction self-adaptive control system under karst cave geological conditions |
| CN117364763A (en) * | 2023-12-07 | 2024-01-09 | 江苏筑港建设集团有限公司 | Pile sinking construction process for wharf pile |
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| CN117364763A (en) * | 2023-12-07 | 2024-01-09 | 江苏筑港建设集团有限公司 | Pile sinking construction process for wharf pile |
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