CN115387403B - Detection device and detection method for integrity of existing foundation pile - Google Patents
Detection device and detection method for integrity of existing foundation pile Download PDFInfo
- Publication number
- CN115387403B CN115387403B CN202210968320.0A CN202210968320A CN115387403B CN 115387403 B CN115387403 B CN 115387403B CN 202210968320 A CN202210968320 A CN 202210968320A CN 115387403 B CN115387403 B CN 115387403B
- Authority
- CN
- China
- Prior art keywords
- foundation pile
- sensor
- pile
- electric spark
- pile body
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000001514 detection method Methods 0.000 title claims abstract description 55
- 238000010892 electric spark Methods 0.000 claims abstract description 69
- 238000000034 method Methods 0.000 claims abstract description 15
- 230000000712 assembly Effects 0.000 claims abstract description 14
- 238000000429 assembly Methods 0.000 claims abstract description 14
- 238000005259 measurement Methods 0.000 claims description 5
- 238000013459 approach Methods 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000005498 polishing Methods 0.000 abstract description 3
- 238000004080 punching Methods 0.000 abstract description 3
- 239000000463 material Substances 0.000 description 6
- 230000007547 defect Effects 0.000 description 5
- 238000009434 installation Methods 0.000 description 5
- 238000010009 beating Methods 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 3
- 238000004873 anchoring Methods 0.000 description 3
- 238000005452 bending Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
- 238000000926 separation method Methods 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000007405 data analysis Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000002829 reductive effect Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Abstract
The invention relates to the technical field of foundation pile detection, and particularly discloses a detection device and a detection method for the integrity of an existing foundation pile, wherein a detection system comprises a vibration auxiliary device, an electric spark vibration source device, an electric spark ignition device, a low-strain dynamic detector, a first sensor and a second sensor, wherein the vibration auxiliary device comprises at least two foundation pile clamping assemblies, each foundation pile clamping assembly comprises a pile body hoop ring, a radial clamping plate positioned at the inner side of the pile body hoop ring, and a connecting screw rod for connecting the pile body hoop ring with the radial clamping plate; the number of the electric spark vibration source devices is the same as that of the radial clamping plates, and each radial clamping plate is provided with one electric spark vibration source device; the electric spark ignition device is electrically connected with the electric spark vibration source device; the low-strain dynamic detector is electrically connected with the electric spark ignition device, the first sensor and the second sensor. The invention avoids the damage operation of the traditional punching and polishing method for manufacturing the vibration striking point, and realizes the detection of the integrity of the existing foundation pile.
Description
Technical Field
The invention relates to the technical field of foundation pile detection, in particular to a detection device and a detection method aiming at the integrity of an existing foundation pile.
Background
Pile foundations are widely used in the field of engineering construction, and as time goes by, existing foundation piles are often damaged by various human factors or natural environments, such as earthquake damage, vehicle impact, environmental corrosion, artificial damage and the like, so that the existing foundation piles are more or less irreversibly damaged. In order to ensure that the existing foundation pile can meet the subsequent use requirements, the integrity detection of the existing foundation pile is very necessary. For the existing foundation pile, due to the influence of the upper structure, the acoustic wave transmission method and the core drilling method are not suitable almost, and a sensor with a low strain method can be installed on the pile side for collecting, so that the method is a preferred choice for detecting the integrity of the existing foundation pile.
The low strain method uses a one-dimensional rod fluctuation theory as an analysis model, and identifies the pile body integrity according to the signal characteristics of one-dimensional stress waves of the pile body, and the propagation of the stress waves is required to be in accordance with the assumption of a flat section as far as possible. However, since the pile top of the existing foundation pile is already integrated with the superstructure, the pile top generally does not have enough room to form a one-dimensional stress wave in a vertical knocking manner, and only a lateral knocking manner can be adopted to generate a pile body stress wave. However, the pile body lateral knocking is difficult to form an effective one-dimensional longitudinal stress wave signal, and the pile body integrity evaluation is seriously affected. Meanwhile, the connection part of the pile top of the existing foundation pile and the upper structure can generate downlink reflected waves, which can be downlink compression waves or downlink tensile waves, depending on the connection condition of the pile top and the upper structure. The method can cause larger errors in signal analysis, defective signals are difficult to identify, and erroneous judgment is formed on the integrity evaluation of the existing foundation piles. It can be seen that reducing or eliminating the generation of the interference signal is an important way to truly identify the integrity of the existing pile body. When the traditional low strain method is used for detection, a small hammer or a force rod is usually adopted to form pile body stress waves, however, due to the existence of an upper structure, the pile top surface has no excitation position under most conditions of the existing building, lateral knocking is needed, and the pile body stress waves formed at the moment contain a large amount of interfering transverse bending waves, so that the judgment of the integrity of the pile body is seriously interfered, and the pile body must be eliminated. Therefore, it is necessary to design a device and a method for detecting the integrity of the existing foundation pile to solve the above-mentioned technical problems.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a detection device and a detection method aiming at the integrity of the existing foundation pile.
The invention comprises a detection system for the integrity of the existing foundation pile, wherein the detection system comprises a vibration auxiliary device, an electric spark vibration source device, an electric spark ignition device, a low-strain dynamic detector, a first sensor and a second sensor,
the vibration auxiliary device comprises at least two foundation pile clamping assemblies, wherein each foundation pile clamping assembly comprises a pile body clamping hoop, a radial clamping plate positioned at the inner side of the pile body clamping hoop, and a connecting screw rod for connecting the pile body clamping hoop with the radial clamping plate;
the number of the electric spark vibration source devices is the same as that of the radial clamping plates, and each radial clamping plate is provided with one electric spark vibration source device;
the electric spark ignition device is electrically connected with the electric spark vibration source device;
the low-strain dynamic detector is electrically connected with the electric spark ignition device, the first sensor and the second sensor.
Further, the foundation pile clamping component further comprises a radial clamping elastic pad fixed on the inner side surface of the radial clamping plate.
Further, the foundation pile clamping component further comprises an elastic connecting piece arranged between the pile body hooping ring and the radial clamping plate.
Furthermore, the two ends of the pile body hooping ring are provided with connecting parts, and the pile body hooping rings are connected into a circular ring through the connecting parts and sleeved on the periphery of the pile body of the foundation pile.
Further, the inner side surface of the radial clamping plate is an inward concave arc shape, and the inner side surface of the radial clamping elastic pad is an inward concave arc shape.
Further, the vibration auxiliary device comprises four foundation pile clamping assemblies, each foundation pile clamping assembly comprises two elastic connecting pieces, and the two elastic connecting pieces are respectively arranged on the left side and the right side of the connecting screw rod.
Further, the radial clamping plate is a steel plate, and the radial clamping elastic pad is a rubber pad.
Further, the elastic connecting piece is a spring.
Further, the electric spark vibration source device is fixedly arranged at the top of the radial clamping plate through an anchoring screw.
The invention also provides a detection method for the integrity of the existing foundation pile, which is realized by the detection system through the following steps:
(1) Arranging a plurality of foundation pile clamping assemblies around a pile body of the foundation pile, connecting a plurality of pile body hooping rings into a circular ring through a connecting part, and sleeving the circular ring on the periphery of the pile body of the foundation pile;
(2) Rotating the connecting screw rod of each foundation pile clamping component to enable each radial clamping plate to gradually approach the pile center of the foundation pile until all the radial clamping elastic pads are tightly attached to the pile body of the foundation pile;
(3) An electric spark vibration source device is fixedly arranged at the top of each radial clamping plate;
(4) The electric spark vibration source device is electrically connected with the electric spark ignition device, and the electric spark ignition device is electrically connected with the low-strain dynamic measuring instrument;
(5) A first sensor and a second sensor are arranged on a pile body of a foundation pile right below one radial clamping elastic pad, the first sensor is arranged at a position which is not less than 0.1 meter right below the bottom of the corresponding radial clamping elastic pad, the second sensor is arranged at a position which is not less than 1 time of the pile diameter of the foundation pile right below the first sensor, and the distance between the second sensor and the first sensor is not less than 1 meter;
(6) Electrically connecting the first sensor and the second sensor with a low strain dynamic meter;
(7) Starting the low-strain dynamic measuring instrument, detecting whether the electric connection of all the components is normal, and inputting the size data of the existing foundation pile and the mounting point distance data of the first sensor and the second sensor into the low-strain dynamic measuring instrument;
(8) The low-strain motion detector sends an ignition signal to the electric spark ignition device, and receives and stores pile body reflection signals acquired by the first sensor and the second sensor;
(9) And (3) repeating the step (8), filtering the pile body reflected signal, separating the uplink and downlink waves, and then evaluating the integrity of the existing foundation pile based on the uplink wave signal.
The system and the method for detecting the integrity of the existing foundation pile realize the detection of the integrity of the existing foundation pile, wherein the vibration auxiliary device can be repeatedly used, is convenient to assemble and disassemble on site, and can be suitable for the existing foundation piles with different pile diameters; the electric spark vibration source devices with the same number as the radial clamping plates are arranged, so that vertical vibration force can be generated at the same time, and approximately one-dimensional longitudinal vibration waves can be formed, which is very important for accurately detecting the integrity of the existing foundation pile, and the defect that bending wave misjudgment detection results are generated by single-side knocking of the traditional pile side is overcome; the installation of the electric spark vibration source device can not damage the pile body, so that the damage operation of the traditional method for punching and polishing to manufacture the vibration striking point is avoided; moreover, the electric spark vibration source device can select corresponding vibration energy level according to the pile length condition, thereby meeting the requirement of detecting the integrity of the ultra-long pile and overcoming the defect that the traditional pile side single-side knocking energy is small and is not suitable for detecting the ultra-long pile.
Drawings
For a clearer description of embodiments of the invention or of solutions in the prior art, the drawings which are used in the description of the embodiments or of the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained from them without inventive effort for a person skilled in the art.
FIG. 1 is a top view of a vibration assisting device in a detection system according to an embodiment of the present invention;
FIG. 2 is a front view of a vibration assist device in a detection system according to an embodiment of the present invention;
FIG. 3 is a schematic diagram (first) illustrating the installation of a vibration assisting device in a detection system according to an embodiment of the present invention;
FIG. 4 is a schematic diagram (II) illustrating the installation of a vibration assisting device in a detection system according to an embodiment of the present invention;
FIG. 5 is a structural diagram of a detection system according to an embodiment of the present invention;
FIG. 6 is a flow chart of the steps of a detection method according to an embodiment of the present invention;
the device comprises a 10-vibration auxiliary device, a 100-foundation pile clamping component, a 101-pile body hooping ring, 1011-connecting parts, 102-radial clamping plates, 103-connecting screws, 104-radial clamping elastic pads, 105-elastic connecting pieces, a 20-electric spark vibration source device, a 30-electric spark ignition device, a 40-low-strain motion detector, a 50-first sensor, a 60-second sensor, a 70-foundation pile and an 80-upper structure.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention.
The embodiment of the invention is a detection system for the integrity of the existing foundation pile, as shown in fig. 1-5, the detection system comprises a vibration auxiliary device 10, an electric spark vibration source device 20, an electric spark ignition device 30, a low stress variation measuring instrument 40, a first sensor 50 and a second sensor 60, wherein the vibration auxiliary device 10 comprises at least two foundation pile clamping assemblies 100, and the foundation pile clamping assemblies 100 comprise pile body hoop rings 101, radial clamping plates 102 positioned on the inner sides of the pile body hoop rings 101, and connecting screws 103 for connecting the pile body hoop rings 101 with the radial clamping plates 102; the number of the electric spark vibration source devices 20 is the same as that of the radial clamping plates 102, and each radial clamping plate 102 is provided with one electric spark vibration source device 20; the electric spark ignition device 30 is electrically connected with the electric spark vibration source device 20; the low strain gauge 40 is electrically connected to the spark ignition device 30, the first sensor 50, and the second sensor 60.
The vibration assisting device 10 of the embodiment of the present invention is composed of a plurality of foundation pile clamping components 100, each foundation pile clamping component 100 has the same structure, wherein the pile body hoop 101 can be designed to be circular arc, and a plurality of pile body hoop 101 can be combined into a closed circular ring surrounding the pile body of the foundation pile 70. The arc angle of the pile body hoop 101 is not particularly limited in this embodiment, if the arc angle is 180 degrees, two foundation pile clamping assemblies 100 are set to clamp the pile body of the foundation pile 70, if the arc angle is 120 degrees, three foundation pile clamping assemblies 100 are set to clamp the pile body of the foundation pile 70, and if the arc angle is 90 degrees, four foundation pile clamping assemblies 100 are set to clamp the pile body of the foundation pile 70. In this embodiment, the material of the pile body hoop 101 is not limited, and a metal with high strength is preferable. The size of the pile body hoop 101 is not limited in this embodiment either, and it should be noted that the diameter of the circular ring formed by the pile body hoop 101 in this embodiment is larger than that of the existing foundation pile 70, so as to be applied to the detection of the existing foundation pile 70 with different pile diameters. In order to realize connection of the pile body hoop 101, as shown in fig. 1, in this embodiment, two ends of the pile body hoop 101 are provided with connection portions 1011, and the pile body hoop 101 is connected into a ring through the connection portions 1011 and is sleeved on the periphery of the pile body of the foundation pile 70. When the connecting parts 1011 of the two adjacent pile body hoops 101 are connected, through holes formed on the connecting parts 1011 can be locked through screws and nuts, so that stable connection between the pile body hoops 101 is realized, and finally, a rigid ring surrounding the pile circumference of the foundation pile 70 is formed, and the ring can bear larger radial pushing force, so that the vibration auxiliary device 10 and the pile body of the foundation pile 70 are tightly adhered to form a common vibration structure.
In this embodiment, the electric discharge source device 20 is mounted on the radial clamping plate 102, and in order to transmit vibration force to the radial clamping plate, the electric discharge source device 20 is fixedly mounted on the top of the radial clamping plate 102 by an anchor screw for achieving a better detection effect.
Specifically, as shown in fig. 1, the foundation pile clamping assembly 100 according to the embodiment of the present invention further includes a radial clamping spring pad 104 fixed to the inner side surface of the radial clamping plate 102. Considering that the foundation pile 70 is mostly cylindrical, in order to make the radial clamping elastic pad 104 fully fit with the pile body of the foundation pile 70, the inner side surface of the radial clamping plate 102 in this embodiment is designed to be a concave circular arc shape, and the inner side surface of the radial clamping elastic pad 104 is also designed to be a concave circular arc shape. The specific materials of the radial clamping plate 102 and the radial clamping elastic pad 104 are not limited in this embodiment, and preferably, the radial clamping plate 102 is a steel plate, and the radial clamping elastic pad 104 is a rubber pad. When the foundation pile 70 is longer, the material of the radial clamping spring pad 104 should be selected from a relatively soft spring medium material to enable the measurement of foundation pile integrity signals of a deeper length, and when the foundation pile 70 is shorter, the material of the radial clamping spring pad 70 should be selected from a relatively hard spring medium material to enable better foundation pile integrity resolution.
As shown in fig. 3 and 4, the foundation pile clamping assembly 100 of the present embodiment further comprises an elastic connection 105 mounted between the pile body clamp ring 101 and the radial clamping plate 102. After the pile body hoop 101 is installed, the radial clamping plate 102 and the radial clamping elastic pad 104 are close to the center of the foundation pile 70 by forward rotation of the connecting screw 103, the elastic connecting piece 105 is gradually compressed, so that the radial clamping elastic pad 104 can be in close contact with the pile body of the foundation pile 70 to transmit the vibration force to the pile body subsequently, and conversely, when the connecting screw 103 rotates reversely, the radial clamping plate 102 and the radial clamping elastic pad 104 move outwards away from the center of the foundation pile 70, and the radial clamping elastic pad 104 is separated from the pile body of the foundation pile 70 under the action of the restoring force of the elastic connecting piece 105, so that the vibration auxiliary device 10 is detached after being used up. In order to facilitate the rotation operation of the connecting screw 103, one end of the connecting screw 103 is connected with the radial clamping plate 102, and the other end of the connecting screw 103 penetrates out of the pile body hoop 101 for a certain distance, so that the connecting screw 103 outside the pile body hoop 101 is operated. The forward rotation and the reverse rotation refer to two opposite directions, namely, the clockwise direction can be used as the forward direction, and the anticlockwise direction can be used as the forward direction, and the distance between the radial clamping plate 102 and the pile body hoop 101 can be reduced only by increasing the distance between the radial clamping plate 102 and the pile body hoop 101 when the vibration assisting device 10 is installed and by decreasing the distance between the radial clamping plate 102 and the pile body hoop 101 when the vibration assisting device 10 is disassembled according to the screw thread arrangement relation between the radial clamping plate 102 and the pile body hoop 101 and the connecting screw 103. In this embodiment, due to the fastening action of the connecting screw 8, the radial clamping elastic pad 105 and the pile body clamp of the foundation pile 70 are fastened together, so that stable and consistent longitudinal stress waves can be formed on the pile body of the foundation pile 70 when the electric spark vibration source device 20 vibrates, and the electric spark vibration source device can be reused after being disassembled.
The resilient connecting element 105 in the embodiment of the invention may be realized by a spring. Preferably, as shown in fig. 1, the vibration assisting apparatus 10 includes four foundation pile clamping assemblies 100, the foundation pile clamping assemblies 100 include two elastic connectors 105, and the two elastic connectors 105 are respectively mounted on the left and right sides of the connecting screw 103, so that the force applied during the process of disengaging the clamping elastic pad 104 from the pile body of the foundation pile 70 is balanced.
In this embodiment, when the vibration assisting device 10 is provided with four, the corresponding electric spark vibration source devices 20 are also provided with four, and are respectively installed at the top of the four radial clamping plates 102, then the radial clamping plates 102 and the electric spark vibration source devices are anchored together by the anchor screws to form a stable integral vibration structure, and vibration force is transmitted to the pile body by the radial clamping elastic pads 104 in the vertical vibration process, so that a pile body longitudinal stress wave is formed and used as a vibration beating force required for pile body integrity detection. It should be noted that, in order to form a one-dimensional effective vibration source, the radial clamping pads 104 should be uniformly distributed along the pile circumference, and the contact length with the pile body of the foundation pile 70 should not be less than one-fourth of the pile body circumference. In addition, the width of the radial clamping spring pad 104 is preferably one-tenth to one-sixth of the diameter of the foundation pile 70, thereby creating an effective longitudinal stress wave that both meets the accuracy of detection and creates an effective shock signal.
In the embodiment of the present invention, the electric spark vibration source device 20 can generate a transient vibration force and a steady vibration force according to the requirement, and is connected with the electric spark ignition device 30 through a cable. In addition, the electric spark vibration source device 20 can select the vibration energy of the corresponding level according to the pile length and the hardness of the soil layer around the pile, so as to be able to detect the pile body integrity detection signal in the range of the pile length above the pile bottom, and the longer the pile length, the larger the corresponding vibration energy is selected. The electric spark ignition device 30 is connected with the low strain dynamic measurement instrument 40 through a signal wire, the low strain dynamic measurement instrument 40 is provided with at least two signal channels, and the low strain dynamic measurement instrument 40 is respectively connected with two sensors, namely a first sensor 50 and a second sensor 60, and is used for collecting pile body acceleration signals and providing detection data analysis basis for the integrity evaluation of the existing foundation pile. The low strain motion detector 40 is provided with an ignition function of the spark ignition device 30 and a data acquisition function of a sensor, so the low strain motion detector 40 is a core of the whole detection system and controls generation, acquisition and analysis of detection signals. The invention has two purposes for detecting the existing foundation pile by adopting two sensors, namely, to truly collect the actual wave speed of the pile body so as to more truly evaluate the actual pile length and detect the possible pile body defect position, and to eliminate the influence of the interference signal of the upper structure 80 of the existing foundation pile 70 by combining an up-down traveling wave separation method so as to ensure that the result judgment is more accurate and avoid the erroneous judgment.
The detection system of the embodiment of the invention can form effective longitudinal stress wave, the vibration auxiliary device can be reused, the installation and the disassembly are convenient, and the pile body is not required to be perforated in advance to avoid damaging the integrity of the pile body. The existing foundation pile detection needs to be prepared in advance, and if part of pile bodies of the existing foundation piles are exposed above the ground, the detection system can be directly installed on the pile bodies of the existing foundation piles; for foundation piles which are not exposed out of the ground, a small section of foundation pile body needs to be excavated close to the ground accessory to be exposed out so as to install a detection system; in the case of a single pile single column structure, the detection system may be mounted on the column of the existing superstructure.
The invention also provides an embodiment of a detection method for the integrity of the existing foundation pile, which is realized based on the embodiment of the detection system, as shown in fig. 6, and the detection method comprises the following steps:
(1) The pile body clamping device comprises a pile body, a pile body clamping assembly, a pile body clamping hoop and a pile body clamping assembly.
As shown in fig. 3, the connection parts 1011 of the pile body hoop 101 are locked by screw and nut two by two to form a complete and fixed ring structure.
(2) And rotating the connecting screw rod of each foundation pile clamping component to enable each radial clamping plate to gradually approach the pile core of the foundation pile until all the radial clamping elastic pads are tightly attached to the pile body of the foundation pile.
As shown in fig. 3 and 4, the connecting screw 103 is twisted forward to gradually approach the radial clamping elastic pad 104 toward the center of the pile until the radial clamping elastic pad and the pile body of the foundation pile 70 are tightly attached together, and finally all the radial clamping elastic pads 104 completely clamp the pile body surface of the foundation pile 70. The radial clamping elastic pad 104 has certain elasticity and rigidity, can ensure close contact with the pile body of the foundation pile 70, can not have gaps even if the pile body is uneven, and ensures that the beating vibration force is transmitted to the pile body of the foundation pile 70.
(3) And an electric spark vibration source device is fixedly arranged at the top of each radial clamping plate.
The radial clamping plate 102 and the electric spark vibration source device 20 are fixed together to form a common vibrating body through the anchoring screw, the anchoring screw has strong pulling resistance, and can bear the vibration load excited by the strong electric spark vibration source device 20 without loosening and releasing, so that smooth detection is ensured.
(4) The electric spark vibration source device is electrically connected with the electric spark ignition device, and the electric spark ignition device is electrically connected with the low-strain dynamic measuring instrument.
The electric spark vibration source device 20 and the electric spark ignition device 30 are connected by a cable, and then the electric spark ignition device 30 and the low-strain dynamic detector 40 are connected together by a signal wire. The electric spark ignition device 30 is an ignition switch of all electric spark vibration source devices 20, so that all electric spark vibration source devices 20 can start to ignite and vibrate simultaneously to form a consistent vertical vibration source.
(5) The foundation pile body under one radial clamping elastic pad is provided with a first sensor and a second sensor, the first sensor is arranged at a position which is not less than 0.1 meter under the bottom of the corresponding radial clamping elastic pad, the second sensor is arranged at a position which is not less than 1 time of the foundation pile diameter under the first sensor, and the second sensor is not less than 1 meter away from the first sensor.
After the first sensor 50 and the second sensor 60 are mounted, the distance data of the mounting points of the two sensors are clarified.
(6) The first sensor and the second sensor are electrically connected to a low strain motion sensor.
The first sensor 50 and the second sensor 60 are connected to the low strain motion sensor 40 with electrical cables.
(7) And starting the low-strain dynamic tester, detecting whether the electric connection of all the components is normal, and inputting the dimension data of the existing foundation pile and the mounting point distance data of the first sensor and the second sensor into the low-strain dynamic tester.
After the low strain motion detector 40 is started, it is first checked whether the connection between the first sensor 50, the second sensor 60 and the electric spark vibration source device 20 is normal, if so, the subsequent steps are performed, if not, the line inspection is performed until the connection is normal, and then the subsequent steps are performed.
(8) The low-strain motion detector sends an ignition signal to the electric spark ignition device, and receives and stores pile body reflection signals acquired by the first sensor and the second sensor.
The low strain dynamic detector 40 starts to detect and simultaneously sends out an ignition signal and a data acquisition signal; generating a beating vibration force through all electric spark vibration source devices 20, transmitting the beating vibration force to the pile body to form a quasi-one-dimensional stress wave, and longitudinally transmitting the quasi-one-dimensional stress wave along the pile body; the two sensors collect pile body reflected signals simultaneously, and the low-strain dynamic detector 40 collects and stores reflected signal data to complete primary foundation pile detection signal collection.
(9) And (3) repeating the step (8), filtering the pile body reflected signal, separating the uplink and downlink waves, and then evaluating the integrity of the existing foundation pile based on the uplink wave signal.
And (5) repeating the step (8) to acquire the required detection signal quantity. The low strain motion detector 40 is internally provided with analysis software, and respectively performs signal processing works such as filtering, uplink and downlink wave separation and the like on pile body reflected signals acquired by the first sensor 50 and the second sensor 60, and then performs existing foundation pile integrity assessment based on the uplink wave signals.
The detection system and the detection method for the integrity of the existing foundation pile realize the detection of the integrity of the existing foundation pile, wherein the vibration auxiliary device can be repeatedly used, is convenient to assemble and disassemble on site, and can be suitable for the existing foundation piles with different pile diameters; the electric spark vibration source devices with the same number as the radial clamping plates are arranged, so that vertical vibration force can be generated at the same time, and approximately one-dimensional longitudinal vibration waves can be formed, which is very important for accurately detecting the integrity of the existing foundation pile, and the defect that bending wave misjudgment detection results are generated by single-side knocking of the traditional pile side is overcome; the installation of the electric spark vibration source device can not damage the pile body, so that the damage operation of the traditional method for punching and polishing to manufacture the vibration striking point is avoided; moreover, the electric spark vibration source device can select corresponding vibration energy level according to the pile length condition, thereby meeting the requirement of detecting the integrity of the ultra-long pile and overcoming the defect that the traditional pile side single-side knocking energy is small and is not suitable for detecting the ultra-long pile.
The invention has been further described with reference to specific embodiments, but it should be understood that the detailed description is not to be construed as limiting the spirit and scope of the invention, but rather as providing those skilled in the art with the benefit of this disclosure with the benefit of their various modifications to the described embodiments.
Claims (10)
1. A detection system for the integrity of the existing foundation pile is characterized by comprising a vibration auxiliary device, an electric spark vibration source device, an electric spark ignition device, a low-strain dynamic detector, a first sensor and a second sensor,
the vibration auxiliary device comprises at least two foundation pile clamping assemblies, wherein each foundation pile clamping assembly comprises a pile body clamping hoop, a radial clamping plate positioned at the inner side of the pile body clamping hoop, and a connecting screw rod for connecting the pile body clamping hoop with the radial clamping plate;
the number of the electric spark vibration source devices is the same as that of the radial clamping plates, and each radial clamping plate is provided with one electric spark vibration source device;
the electric spark ignition device is electrically connected with the electric spark vibration source device;
the low-stress variation detector is electrically connected with the electric spark ignition device, the first sensor and the second sensor.
2. A system for testing the integrity of an existing foundation pile according to claim 1, wherein said foundation pile gripping assembly further comprises a radial gripping spring pad secured to the inner side of said radial gripping plate.
3. A system for testing the integrity of an existing foundation pile according to claim 2, wherein said foundation pile clamping component further comprises a resilient connection mounted between said pile body hugging ring and said radial clamping plate.
4. A system for detecting the integrity of an existing foundation pile according to claim 3, wherein two ends of each pile body hoop are provided with connecting parts, and a plurality of pile body hoops are connected into a circular ring through the connecting parts and sleeved on the periphery of the pile body of the foundation pile.
5. The system of claim 4, wherein the inner side of the radial clamping plate is concave arc-shaped and the inner side of the radial clamping elastic pad is concave arc-shaped.
6. A system for testing the integrity of an existing foundation pile according to claim 4, wherein said vibration assist device comprises four said foundation pile clamping assemblies including two said resilient connectors mounted on either side of said connecting screw.
7. A system for testing the integrity of an existing foundation pile according to claim 4, wherein said radial clamping plates are steel plates and said radial clamping spring pads are rubber pads.
8. A testing system for the integrity of an existing foundation pile according to claim 4, wherein said resilient connection is a spring.
9. A system for testing the integrity of an existing foundation pile according to claim 4, wherein said electric discharge source means is fixedly mounted on top of said radial clamping plates by means of anchor screws.
10. A method for detecting the integrity of an existing foundation pile, characterized in that the detection system according to any one of claims 4-9 is realized by the following steps:
(1) Arranging a plurality of foundation pile clamping assemblies around a foundation pile body, connecting a plurality of pile body hooping rings into a circular ring through the connecting part, and sleeving the circular ring on the periphery of the foundation pile body;
(2) Rotating the connecting screw rod of each foundation pile clamping component to enable each radial clamping plate to gradually approach to the pile center of the foundation pile until all the radial clamping elastic pads are tightly attached to the pile body of the foundation pile;
(3) The top of each radial clamping plate is fixedly provided with an electric spark vibration source device;
(4) The electric spark vibration source device is electrically connected with the electric spark ignition device, and the electric spark ignition device is electrically connected with the low-strain dynamic measurement instrument;
(5) The first sensor and the second sensor are installed on the pile body of the foundation pile right below one of the radial clamping elastic pads, the first sensor is installed at a position which corresponds to not less than 0.1 meter right below the bottom of the radial clamping elastic pad, the second sensor is installed at a position which is not less than 1 time of the pile diameter of the foundation pile right below the first sensor, and the second sensor is not less than 1 meter away from the first sensor;
(6) Electrically connecting the first sensor and the second sensor with the low strain motion sensor;
(7) Starting the low-strain dynamic tester, detecting whether the electrical connection of all the components is normal, and inputting the size data of the existing foundation pile and the mounting point distance data of the first sensor and the second sensor into the low-strain dynamic tester;
(8) The low-stress change detector sends an ignition signal to the electric spark ignition device, and receives and stores pile body reflection signals acquired by the first sensor and the second sensor;
(9) And (3) repeating the step (8), filtering the pile body reflected signal, separating the uplink and downlink waves, and then evaluating the integrity of the existing foundation pile based on the uplink wave signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210968320.0A CN115387403B (en) | 2022-08-12 | 2022-08-12 | Detection device and detection method for integrity of existing foundation pile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210968320.0A CN115387403B (en) | 2022-08-12 | 2022-08-12 | Detection device and detection method for integrity of existing foundation pile |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115387403A CN115387403A (en) | 2022-11-25 |
| CN115387403B true CN115387403B (en) | 2024-02-27 |
Family
ID=84119182
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210968320.0A Active CN115387403B (en) | 2022-08-12 | 2022-08-12 | Detection device and detection method for integrity of existing foundation pile |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115387403B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103255785A (en) * | 2012-02-15 | 2013-08-21 | 陈彦平 | Technology for performing foundation pile quality detection and geology survey by adopting single tube longitudinal wave method |
| CN109537649A (en) * | 2018-12-20 | 2019-03-29 | 九江职业技术学院 | A kind of pile's integrity testing small strain detection robot |
| CN209779714U (en) * | 2019-01-23 | 2019-12-13 | 广州二九三物探工程勘察院 | Tubular pile low strain detector |
| CN211080332U (en) * | 2019-09-18 | 2020-07-24 | 马鞍山十七冶工程科技有限责任公司 | Foundation pile detects displacement measurement device for static test |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1774278B1 (en) * | 2004-07-23 | 2013-02-13 | Smart Structures, Inc. | Monitoring system for concrete pilings and method of installation |
-
2022
- 2022-08-12 CN CN202210968320.0A patent/CN115387403B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103255785A (en) * | 2012-02-15 | 2013-08-21 | 陈彦平 | Technology for performing foundation pile quality detection and geology survey by adopting single tube longitudinal wave method |
| CN109537649A (en) * | 2018-12-20 | 2019-03-29 | 九江职业技术学院 | A kind of pile's integrity testing small strain detection robot |
| CN209779714U (en) * | 2019-01-23 | 2019-12-13 | 广州二九三物探工程勘察院 | Tubular pile low strain detector |
| CN211080332U (en) * | 2019-09-18 | 2020-07-24 | 马鞍山十七冶工程科技有限责任公司 | Foundation pile detects displacement measurement device for static test |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115387403A (en) | 2022-11-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108254440B (en) | Detection robot and method for detecting concrete-filled steel tube pouring quality by using same | |
| JP4667228B2 (en) | Pile inspection method and sensor crimping device | |
| CN105865397B (en) | The effective anchorage depth lossless detection method of overall length binding type anchor pole and device | |
| US20040025593A1 (en) | Device and method for acoustic diagnosis and measurement by pulse electromagnetic force | |
| EP0005372A2 (en) | Apparatus for monitoring the vibrational behaviour of structural elements in a composite structure | |
| WO1992009847A1 (en) | Pipeline pig and method of pipeline inspection | |
| KR100973215B1 (en) | Measuring system | |
| CN109098215B (en) | Low-strain detection method for pile foundation | |
| JP2017090101A (en) | Non-destructive inspection method and non-destructive inspection system of prefabricated concrete pile installed underground | |
| JP3472931B2 (en) | Seismic wave simulation device | |
| CN115387403B (en) | Detection device and detection method for integrity of existing foundation pile | |
| CN111238702A (en) | Bolt axial stress testing device and testing method based on ultrasonic measurement | |
| CN108333061B (en) | System and method for measuring stress relaxation | |
| CN105092709A (en) | Concrete structure nondestructive detection method | |
| JPH0511895B2 (en) | ||
| CN109238452B (en) | Single-sensor pickup device based on impact echo acoustic frequency detection | |
| CN105388210A (en) | Stayed-cable damage detection device and detection method based on temporary steel inclined strut | |
| US11181507B2 (en) | Method for an acoustic resonance inspection and diagnosing of defects in solid materials and a diagnostic device | |
| JP5897199B1 (en) | Anchor bolt soundness evaluation judgment method | |
| CN111678465A (en) | Pipeline bending detection method based on ultrasonic guided waves | |
| JP2020148603A (en) | Ultrasonic probe, anchor bolt ultrasonic flaw detection inspection device, and anchor bolt ultrasonic flaw detection inspection method | |
| KR200179851Y1 (en) | Device to measure stress waves inside a core hole of tunnel lining | |
| JP2001074706A (en) | Method for diagnosing ground anchor | |
| KR102357219B1 (en) | Electric pole diagnosis device using guided ultrasound | |
| Aswin et al. | Analysis of free vibration measurement by mems accelerometer device on wind turbine blade |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |