CN115977170A - Pore-forming quality detection device and detection method for cast-in-situ bored pile - Google Patents
Pore-forming quality detection device and detection method for cast-in-situ bored pile Download PDFInfo
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- CN115977170A CN115977170A CN202211139111.1A CN202211139111A CN115977170A CN 115977170 A CN115977170 A CN 115977170A CN 202211139111 A CN202211139111 A CN 202211139111A CN 115977170 A CN115977170 A CN 115977170A
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Abstract
The invention discloses a pore-forming quality detection device and a pore-forming quality detection method for a cast-in-situ bored pile, wherein the pore-forming quality detection device comprises a wellhead frame and a pulley, the pulley is arranged in the center of a drilled hole and is fixed on the wellhead frame by a C-shaped rolling head, and the pulley is used for placing a cable and sending a detection device into the drilled hole; the winch is arranged on the wellhead frame and has a certain distance from the wellhead, and the winch is used for sending the measuring instrument into a specified detection position and taking the measuring instrument out of the drilled hole; and the digital acquisition recorder is connected with a socket on the winch collector ring through a lead. The device is used for digitizing the acquired signals through the digital acquisition recorder, then the information acquired by the acquisition recorder is printed through the printer by the computer, the data is printed on site, the digitization of bored concrete pile pore-forming detection is realized, the operation is simple, the data storage and processing are convenient and quick, and the efficiency and the quality in the engineering detection work can be greatly improved.
Description
Technical Field
The invention relates to the technical field of civil engineering foundation pile detection, in particular to a hole forming quality detection device and a hole forming quality detection method for a cast-in-situ bored pile.
Background
Bored piles are one of the forms of foundation piles commonly used in buildings, which transmit the load of the superstructure to deep stabilized earth or rock formations. Reducing uneven settlement of the foundation and the building. The construction of the bored pile is divided into a hole forming part and a pile forming part, wherein the hole forming part is the first link of the bored pile construction. The operation process is finished underground or underwater, the quality control difficulty is high, and the problems of hole collapse, hole shrinkage, pile hole deflection, excessive sediment and the like can be caused by complicated geological conditions or errors in construction. The quality of the formed hole directly influences the pile forming quality after the concrete pouring; if the diameter of the pile is smaller, the side friction resistance and the pile tip bearing capacity of the formed pile are reduced, and the bearing capacity of the whole pile is reduced; the pile hole expanding needle causes the side resistance of the upper part of the pile to be increased, but the side resistance of the lower part of the pile cannot be fully exerted, and simultaneously, the concrete pouring amount of a single pile is increased, and the cost is increased; the pile hole deflection changes the vertical bearing stress characteristic of the pile to a certain extent, the effective exertion of the bearing capacity of the pile foundation is weakened, and the problems of difficulty in hoisting a reinforcement cage, hole collapse, insufficient thickness of a reinforcement protection layer and the like are easily caused by the hole deflection; the excessive thickness of the sediment at the bottom of the pile leads the length of the pile to be reduced, and the end bearing capacity of the pile tip is directly influenced for the end bearing pile. Therefore, the detection of the pore-forming quality of the bored pile before concrete pouring is very important for controlling the pile-forming quality.
A bored pile hole forming quality detection device and method with the publication number of CN106545329B are characterized in that a fluid density signal input interface, an ultrasonic communication interface and a three-dimensional attitude interface of a hole forming detection host machine are respectively connected with a fluid density sensor, an ultrasonic transmitting and receiving sensor and a three-dimensional attitude sensor through a cable rotating node and a cable bus of a take-up and pay-off reel in sequence; the cable bus is wound on the take-up and pay-off disc, the take-up and pay-off disc controls take-up and pay-off, the cable bus is taken up and paid-off on the depth counting pulley, the depth counting pulley records the length of the take-up and pay-off of the cable bus, and the depth feedback signal output end of the depth counting pulley is connected with the pore-forming detection host; the GPS sensor is positioned right above the probe, and the signal output end of the GPS sensor is connected with the GPS signal input end of the pore-forming detection host. The invention can detect the parameters of the hole diameter, the hole depth, the verticality, the whole hole slurry density, the sediment thickness, the drilling inclination direction, the hole opening coordinate and the like of the hole forming of the drilled pile, and ensure the reliable hole forming quality of the drilled pile.
However, the existing automation degree is low, data processing is inconvenient, and the working efficiency is low.
Disclosure of Invention
The invention aims to solve the defects in the prior art, and provides a device and a method for detecting the hole forming quality of a cast-in-situ bored pile, wherein the device comprises the following steps: the pulley is arranged in the center of the drill hole and fixed on the wellhead frame by a C-shaped rolling head, and the pulley is used for placing a cable and sending the detection equipment into the drill hole;
the winch is arranged on the wellhead frame and is a certain distance away from the wellhead, and the winch is used for sending the measuring instrument into a specified detection position and taking the measuring instrument out of the drilled hole;
the digital acquisition recorder is connected with a socket on the winch collector ring through a lead, the digital acquisition recorder is used for digitizing acquired signals, and the winch penetrates through a pulley through a cable to be connected with detection equipment.
As a further description of the above technical solution: the digital acquisition recorder is connected with a computer through a wire, the computer is connected with a printer through a wire, and the computer prints information acquired by the acquisition recorder through the printer.
As a further description of the above technical solution: the detection equipment is a caliper, a sediment determinator or an inclinometer.
As a further description of the above technical solution: and a small amount of butter is smeared on two O-shaped rings in the universal sealing joint of the cable, and then the universal sealing joint is connected with detection equipment.
As a further description of the above technical solution: the cable is a high-strength cable.
As a further description of the above technical solution: the wellhead housing is placed on the grade above the borehole.
As a further description of the above technical solution: the detection equipment is not in contact with the hole wall and is positioned at the central shaft of the drill hole.
As a further description of the above technical solution: the winch is arranged to be opposite to the center line of the wellhead frame and is at a certain distance from the wellhead.
As a further description of the above technical solution: the connection mode between the detection equipment and the cable is detachable connection.
A method for detecting the pore-forming quality of a cast-in-situ bored pile,
s1: fixedly connecting the detection equipment and a winch at two ends of the cable;
s2: a digital acquisition recorder 'measurement conversion' switch selects one of 'hole diameter', 'inclination measurement' and 'sediment' gears, then a power supply is turned on, and the power supply enters an aperture measurement window from a software main menu window to perform aperture measurement, a perpendicularity measurement window to perform perpendicularity measurement or a sediment measurement window to perform sediment thickness measurement;
s3: starting a winch, and conveying the detection equipment into a drill hole through a pulley and a cable for detection;
s4: controlling a printer to print out detection data through a computer;
s5: calculating data by a corresponding calculation method;
s6: and finishing the pore-forming quality detection.
The technical scheme has the following advantages or beneficial effects:
1. the invention is used for digitizing the acquired signal through the digital acquisition recorder, then the computer prints the information acquired by the acquisition recorder through the printer, and prints the data on site, thereby realizing the digitization of the bored concrete pile hole forming detection.
2. The invention switches aperture measurement, verticality measurement and sediment thickness measurement by the digital acquisition recorder, and has the advantages of integrated detection, simple operation and convenient detection.
3. The invention has small occupied area through instruments, is convenient to adapt to the field environment and has high operability.
Drawings
FIG. 1 is a schematic view of the structure of the present invention in use.
Illustration of the drawings:
1. a wellhead housing; 2. a pulley; 3. a winch; 4. a digital acquisition recorder; 5. a cable; 6. a detection device; 7. a computer; 8. a printer; 9. a caliper; 10. a sediment determinator; 11. an inclinometer; 12. drilling; 13. a terrace; 14. and (4) hole walls.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
as shown in figure 1, the hole forming quality detection device of the cast-in-situ bored pile and the detection method thereof comprise a wellhead frame 1 and a pulley 2, wherein the pulley 2 is arranged in the center of a borehole 12 and is fixed on the wellhead frame 1 by a C-shaped rolling head, the pulley 2 is used for placing a cable and sending a detection device into the borehole 12; the winch 3 is arranged on the wellhead frame 1 and is a certain distance away from the wellhead, and the winch 3 is used for sending the measuring instrument into a specified detection position and taking out the measuring instrument from the borehole 12; the digital acquisition recorder 4 is connected with a socket on a slip ring of the winch 3 through a lead, the digital acquisition recorder 4 is used for digitizing acquired signals, the winch 3 penetrates through the pulley 2 through a cable 5 to be connected with the detection equipment 6, the winch 34 can adopt a JC-1B constant-speed electric winch, and the digital acquisition recorder 4 can adopt a JJC-1D digital acquisition recorder.
As shown in fig. 1, the digital acquisition recorder 4 is connected with a computer 7 through a lead, the computer 7 is connected with a printer 8 through a lead, and the computer 7 prints information acquired by the acquisition recorder 4 through the printer 8; the digital acquisition recorder 4 is used for digitizing acquired signals, the computer 7 is used for printing information acquired by the acquisition recorder 4 through the printer 8, data are printed on site, digitization of bored concrete pile pore-forming detection is achieved, operation is simple, data storage and processing are convenient and fast, and efficiency and quality in engineering detection work can be greatly improved.
Example two:
as shown in fig. 1, in the first embodiment, S1: fixedly connecting the detection equipment 6 and the winch 3 at two ends of the cable 5; s2: the digital acquisition recorder 4 selects one of the gears of 'hole diameter', 'inclination measurement' and 'sediment' by a 'measurement conversion' switch, then a power supply is switched on, and the power supply enters an aperture measurement window from a software main menu window to carry out aperture measurement, a perpendicularity measurement window to carry out perpendicularity measurement or a sediment measurement window to carry out sediment thickness measurement; s3: the winch 3 is started, and the detection equipment 6 is sent into the drill hole 12 through the pulley 2 and the cable 5 for detection; s4: the computer 7 controls the printer 8 to print out the detection data; s5: calculating data through a corresponding calculation method; s6: completing pore-forming quality detection; the aperture measurement, the verticality measurement and the sediment thickness measurement are switched by the digital acquisition recorder 4, the integrated detection is realized, the operation is convenient and simple, and the device is formed by combining the computer 7, the digital acquisition recorder 4, the caliper 9, the sediment determinator 10, the inclinometer 11 and various necessary matching equipment, and has good matching performance and operability.
As shown in fig. 1, in this embodiment, the detection device 6 is a caliper 9, a sediment determinator 10 or an inclinometer 11, the detection device 6 is not limited to the instrument described in this application, two "O" rings in a universal sealing joint of the cable 5 should be smeared with a little grease and then connected with the detection device 6, the cable 5 is a high-strength cable, the wellhead frame 1 is placed on a floor 13 above a borehole 12, the detection device 6 is not in contact with a borehole wall 14 and is located at a central axis of the borehole 12, the winch 3 is placed to be over against a central line of the wellhead frame 1 and is at a certain distance from the wellhead, and the connection mode between the detection device 6 and the cable 5 is detachable connection; the caliper 9 can adopt a JJY-2 caliper, the sediment determinator 10 can adopt a JNC-1 sediment determinator, and the inclinometer 11 can adopt a JJM-1 high-precision inclinometer.
Example three:
on the basis of the first and second embodiments, the present invention provides a technical solution:
a method for detecting an aperture using the apparatus of embodiments one or two, comprising the steps of: s1: the 'winch' aviation socket on the back plate of the digital acquisition recorder 4 is connected with the 5-core aviation socket on the collecting ring of the winch 3 by the equipped connecting wire, and then the universal sealing joint of the cable is butted with the caliper 9. The digital acquisition recorder 4 selects a 'hole diameter' gear through a 'measurement conversion' switch, the digital acquisition recorder 4 and a computer power supply are turned on, and testing software of a bored concrete pile hole diameter detection system is operated after a computer system is started; s2: entering a calibration window from a software main menu window, clicking a 'verification aperture value' button in the window, and if an aperture value (not empty) is displayed in an 'actually measured aperture' text box, proving that the system is in normal communication, and starting to measure; s3: entering an aperture measuring window from a software main menu window to measure the aperture; s4: the digital acquisition recorder 4 is powered off. And taking out the caliper 9, unscrewing the cable joint nut, and detaching the caliper 9.
And (3) drawing a hole depth-hole diameter curve chart by adopting professional software, and calculating the arithmetic mean (average hole diameter), the maximum hole diameter and the minimum hole diameter of the pile hole. The hole diameter measurement is detected by four sensors connected with each other by aperture values in two orthogonal directions, and the sensors (a power supply loop and a measurement loop) connected with 4 measurement legs are used for measuring the hole diameter.
The hole diameter (D) is a linear function of the measurement signal Δ VMN.
The aperture calculation formula is as follows:
D＝D0+K0(△VMN/I)
d0-initial pore size (constant)
K0-Instrument constant
I-constant current supplied (10 mA)
Sometimes, due to the fact that the specific gravity of the mud at the bottom of the hole is large, the hole diameter measuring leg cannot be completely unfolded, few hole diameter measuring data at the bottom of the hole are often distorted, and at the moment, partial hole diameter measuring data at the bottom of the hole need to be removed.
Example four:
on the basis of the first and second embodiments, the invention provides a technical scheme that:
the method for detecting the perpendicularity by using the device in the first embodiment or the second embodiment comprises the following steps: s1: and (3) butting the universal sealing joint of the cable with the underground instrument of the inclinometer 11, and putting the underground instrument of the inclinometer into the well. The digital acquisition recorder 4 'measurement conversion' switch selects 'inclination measuring' gear and then turns on the power supply. Entering a verticality measuring window from a software main menu window to measure the verticality; s2: if the numerical values in the text box of the drilling depth are modified, inputting a correction value; s3: starting a winch 3 to lower an inclinometer downhole instrument, stopping when a special mark on a cable is lowered to the drilling depth for starting the surface, presetting the depth display value to be 5.00m, and checking the zero value of the top angle of the inclinometer at the depth; s4: clicking a button of an aperture measurement window for starting to measure downwards, starting a winch 3, and lowering an underground instrument of an inclinometer 11; s5: observing the change of the hole depth, stopping the downward movement of the underground instrument of the inclinometer every 5 meters, reading the vertex angle value and the hole depth value of the measuring point, inputting the vertex angle value and the hole depth value of the measuring point in a text box of the vertex angle value and the hole depth value of each measuring point, typing in a 'enter' key, completing the input of numerical values, and continuing to perform downward measurement until the hole bottom, wherein the downward movement depth of the underground instrument is stopped 2 meters before the underground instrument reaches the hole bottom so as to prevent the thick slurry from influencing the measurement result (if the measurement is performed in a drilling hole, the stopping depth is advanced by 5 meters, and the underground instrument is not clamped in the drill bit). When the measurement is finished, the computer automatically extends the last measured point value to the final hole depth and stores data, the underground instrument of the inclinometer is lifted to the wellhead, and the instrument is taken out and washed clean; s6: if the data is accurate, the eccentricity can be calculated, the verticality can be calculated, and the verticality measurement data can be stored. If the well head is not calibrated, the reading number of the individual point has a negative value, the value of each measuring point above the maximum negative value point (including the point) is changed into zero, and the absolute value of the maximum negative measuring point value is added to the values below, and then the calculation is carried out.
The vertex angle measurement of the inclinometer adopts a linear angle sensor (liquid pendulum), and the output value of the linear angle sensor is in a linear relation with the inclination angle of the sensor.
Two orthogonal sensors are arranged in the inclinometer, and the perpendicularity of the pile hole is calculated by adopting professional software, wherein the calculation formula is as follows:
x, Y: two sensor signals;
x0, Y0: an instrument constant;
α: vertex angle value.
The instrument constant is determined after calibration on a calibration stand of the inclinometer, and when the instrument is maintained or the impact error is larger than 0.1 degree, the instrument constant needs to be calibrated again.
Because the verticality measurement data are dynamic data acquired in the process of lifting the probe tube, if obstacles exist in the hole or other interferences exist (for example, the probe tube cannot be kept upright when the hole is at the bottom), individual abnormal data can appear during acquisition, and the abnormal data are removed and then calculated
Example five:
on the basis of the first and second embodiments, the invention provides a technical scheme that:
the method for detecting sediments by using the equipment in the first embodiment and the second embodiment comprises the following steps: s1: and butting the universal sealing joint of the cable 5 with the underground instrument of the sediment determinator 10, and putting the underground instrument of the sediment determinator into the well and ensuring that the micro-electrode system is partially immersed in water. The digital acquisition recorder 4 selects the 'sediment' gear through the 'measurement conversion' switch, and then turns on the power supply (note that the gear is shifted first and then the power is supplied, so as not to damage the gear shift switch). Entering a sediment measuring window from a software main menu window to measure the sediment thickness; s2: and (3) starting the winch, lowering a downhole instrument (10) of the sediment determinator (the measuring point position of the downhole instrument is 0.5m higher than the caliper), stopping the downhole instrument when a special mark on the cable is lowered to the drilling depth and the drilling depth is calculated, wherein the actual depth of the downhole instrument is 4.50m, and in order to keep the standard point consistent with the caliper during measurement, the standard depth point is moved to the wellhead by 0.5m. The depth display value can accurately indicate the measuring point position of the instrument in the hole; s3: clicking a 'start down measurement' button of the sediment measurement window, starting the winch 3, and lowering the sediment determinator downhole instrument until the sediment determinator downhole instrument reaches the bottom of the hole, wherein the cable is loosened; s4: observing the change range of the apparent resistivity value in the next measurement, and selecting a proper measurement range or an appropriate amplification factor; s5: and lifting the cable by 1-2m, grasping a handle of the winch, and pulling out the bolt between the reduction gearbox and the gear, wherein the winch 3 is in a manual state. Suddenly loosening the handle to enable the underground instrument of the sediment determinator 10 to freely fall down to penetrate through the sediment layer to reach the original soil layer; s6: manually tightening the cable, and measuring the actual depth to be measured; s7: clicking a 'start up measurement' button of a sediment measurement window, shaking the winch at a very slow speed, accelerating the speed by about 1 m/min, lifting the cable, and starting up measurement. (note that when the probe is inserted into the original soil layer and the lifting is very laborious, the requester needs not to forcibly lift the cable, and the requester needs to slowly cooperate with the winch to shake the cable, otherwise the rotating part of the winch can be damaged). And the upper computer measurement software automatically records the apparent resistivity-depth curve of the slurry. Until the instrument measures 2.00m, or at 2.00m less, the measurement is stopped manually according to the detection curve. If the data to be printed is required, the data can be connected with a printer to print the report data on site. Judging the sediment thickness according to the mud apparent resistivity-depth curve; s8: inserting the pulled bolt as it is, restoring the winch to the electric state, turning off the power supply of the microcomputer tester, and lifting the underground instrument of the sediment tester 10 until the hole is taken out; s9: and taking out the underground instrument of the sediment tester, unscrewing the cable joint nut, dismounting the underground instrument of the sediment tester, and washing the underground instrument.
The mud of the bored pile is mostly naturally formed in the drilling process of a drilling machine, the viscosity and the sand content of the mud are determined by the properties and the crushing degree of a soil layer and the process of circular treatment, the non-uniformity of the mud in a pile hole can be caused, particularly, soil blocks which are not completely crushed at the bottom of the pile hole and the mud which has large sand content and low colloid content are greatly precipitated, the mud with large specific gravity at the bottom of the hole and the mud with good suspension of upper particles have obvious electrical property difference, therefore, the apparatus adopts a resistivity method, an alternating electric field which is not influenced by the soil layer is supplied in the mud, the uniform mud resistivity is a straight line, the electric field can be distorted on a sediment interface, the resistivity can be changed, and the thickness of the sediment can be determined by using the inflection point of a curve.
The working principle is as follows: the worker fixedly connects the detection device 6 and the winch 3 at two ends of the cable 5, the digital acquisition recorder 4 'measurement conversion' switch selects one of 'hole diameter', 'inclination measurement' and 'sediment' gears, then the power supply is turned on, the hole diameter measurement is carried out by entering a hole diameter measurement window from a software main menu window, the verticality measurement is carried out by a verticality measurement window or the sediment thickness measurement is carried out by a sediment measurement window, the winch 3 is started, the detection device 6 is sent into the drill hole 12 for detection by the pulley 2 and the cable 5, the detection data is printed by controlling the printer 8 by the computer 7, the data is calculated by a corresponding calculation method, the detection of the pore-forming quality is completed, the acquired signal is digitized by the digital acquisition recorder 4, then the information acquired by the acquisition recorder 4 is printed by the printer 8 by the computer 7, the data is printed on site, the digitization of the pore-forming detection of the cast-in-place pile is realized, the operation is simple, the data storage and the processing are convenient and fast, and the efficiency and the quality in the engineering detection work can be greatly improved.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.
Claims (10)
1. A pore-forming quality detection device of a cast-in-situ bored pile comprises a wellhead frame (1) and is characterized by comprising a pulley (2), wherein the pulley (2) is arranged at the center of a borehole (12) and is fixed on the wellhead frame (1) by a C-shaped rolling head, and the pulley (2) is used for placing a cable and sending a detection device into the borehole (12);
the winch (3) is arranged on the wellhead frame (1) and is a certain distance away from the wellhead, and the winch (3) is used for sending the measuring instrument into a specified detection position and taking out the measuring instrument from the drill hole (12);
the digital acquisition recorder (4) is connected with a socket on a collector ring of the winch (3) through a lead, the digital acquisition recorder (4) is used for digitizing acquired signals, and the winch (3) penetrates through the pulley (2) through a cable (5) to be connected with the detection equipment (6).
2. The apparatus for detecting the quality of the formed hole of a cast-in-situ bored pile according to claim 1, wherein: the digital acquisition recorder (4) is connected with the computer (7) through a wire, the computer (7) is connected with the printer (8) through a wire, and the information acquired by the acquisition recorder (4) is printed by the computer (7) through the printer (8).
3. The apparatus according to claim 1, wherein the apparatus comprises: the detection equipment (6) is a caliper (9), a sediment determinator (10) or an inclinometer (11).
4. The apparatus for detecting the quality of the formed hole of a cast-in-situ bored pile according to claim 1, wherein: and a small amount of butter is smeared on two O-shaped rings in the universal sealing joint of the cable (5), and then the universal sealing joint is connected with the detection equipment (6).
5. The apparatus for detecting the quality of the formed hole of a cast-in-situ bored pile according to claim 1, wherein: the cable (5) is a high-strength cable.
6. The apparatus according to claim 1, wherein the apparatus comprises: the wellhead frame (1) is placed on a floor (13) above the borehole (12).
7. The apparatus for detecting the quality of the formed hole of a cast-in-situ bored pile according to claim 1, wherein: the detection device (6) is not in contact with the bore wall (14) and is located at the central axis of the bore (12).
8. The apparatus according to claim 1, wherein the apparatus comprises: the winch (3) is arranged to be opposite to the central line of the wellhead frame (1) and is away from the wellhead by a certain distance.
9. The apparatus for detecting the quality of the formed hole of a cast-in-situ bored pile according to claim 1, wherein: the detection equipment (6) is detachably connected with the cable (5).
10. A method for detecting the pore-forming quality of a cast-in-situ bored pile is characterized by comprising the following steps:
s1: fixedly connecting the detection equipment (6) and the winch (3) at two ends of the cable (5);
s2: a digital acquisition recorder (4) selects one of the gears of 'hole diameter', 'inclination measurement' and 'sediment' through a 'measurement conversion' switch, then a power supply is switched on, and the power supply enters an aperture measurement window from a software main menu window to carry out aperture measurement, a verticality measurement window to carry out verticality measurement or a sediment measurement window to carry out sediment thickness measurement;
s3: starting a winch (3), and conveying the detection equipment (6) into the drill hole (12) through a pulley (2) and a cable (5) for detection;
s4: the computer (7) controls the printer (8) to print out the detection data;
s5: calculating data through a corresponding calculation method;
s6: and finishing the pore-forming quality detection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211139111.1A CN115977170A (en) | 2022-09-19 | 2022-09-19 | Pore-forming quality detection device and detection method for cast-in-situ bored pile |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211139111.1A CN115977170A (en) | 2022-09-19 | 2022-09-19 | Pore-forming quality detection device and detection method for cast-in-situ bored pile |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117168276A (en) * | 2023-11-03 | 2023-12-05 | 北京华力方元科技有限公司 | Quality detection device and method for dry hole of cast-in-place pile |
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2022
- 2022-09-19 CN CN202211139111.1A patent/CN115977170A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117168276A (en) * | 2023-11-03 | 2023-12-05 | 北京华力方元科技有限公司 | Quality detection device and method for dry hole of cast-in-place pile |
| CN117168276B (en) * | 2023-11-03 | 2024-02-02 | 北京华力方元科技有限公司 | Quality detection device and method for dry hole of cast-in-place pile |
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