CN112709267A - System and construction method for detecting integrity of pile body of underwater cast-in-place pile - Google Patents
System and construction method for detecting integrity of pile body of underwater cast-in-place pile Download PDFInfo
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- CN112709267A CN112709267A CN202011576750.5A CN202011576750A CN112709267A CN 112709267 A CN112709267 A CN 112709267A CN 202011576750 A CN202011576750 A CN 202011576750A CN 112709267 A CN112709267 A CN 112709267A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
- E02D15/04—Placing concrete in mould-pipes, pile tubes, bore-holes or narrow shafts
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
- E02D15/06—Placing concrete under water
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2200/00—Geometrical or physical properties
- E02D2200/17—Geometrical or physical properties including an electric conductive element
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2250/00—Production methods
- E02D2250/0023—Cast, i.e. in situ or in a mold or other formwork
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- General Life Sciences & Earth Sciences (AREA)
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- Civil Engineering (AREA)
- Underground Or Underwater Handling Of Building Materials (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention relates to a system for detecting the integrity of an underwater cast-in-place pile body and a construction method thereof. The construction method of the system for detecting the integrity of the pile body of the underwater cast-in-place pile for detecting the cost comprises the following steps: doping magnetic powder into concrete; manufacturing a reinforcement cage, arranging a copper conductor in the reinforcement cage and spirally arranging the copper conductor downwards along the inner ring of the reinforcement cage, and lowering the reinforcement cage to a preset position; the strong magnet is put into a reserved hollow pipeline of the reinforcement cage; carrying out underwater concrete pouring, and adjusting the rising speed of the strong magnet in the reserved hollow pipeline; and the current detector is connected to two ends of the copper conductor and monitors the change of current to detect whether the pile body of the underwater cast-in-place pile is complete. The construction method is simple in detection principle and strong in operability, can adapt to complex construction site environments, is suitable for any time period during concrete pouring or after forming, has a wide application range, and is low in manufacturing cost and beneficial to saving of detection cost.
Description
Technical Field
The invention relates to the field of building construction, in particular to a system and a construction method for detecting the integrity of an underwater cast-in-place pile body.
Background
In recent years, cast-in-place piles have been widely used in many large-scale projects due to their advantages of strong bearing capacity. However, because the cast-in-place pile is a hidden project, the pile body of the cast-in-place pile is inevitably defective in the casting process due to various accidental construction problems during the underwater concrete casting construction, such as: segregation, mud inclusion, cavities, necking, pile breakage and the like, and the defects cause that the cast-in-place pile can not meet the pile foundation bearing capacity required by the design after being formed into a pile, and finally becomes a waste pile.
The traditional method for detecting the integrity of the pile foundation comprises a sound pipe measuring method, a temperature field induction method and the like. The acoustic tube method is characterized in that acoustic waves are transmitted in different media at different frequencies and are generated to be diffused unevenly, so that an acoustic wave cloud picture is drawn. The temperature field induction method is to draw the change of a temperature field by utilizing the difference of specific heat capacity and conduction temperature rate of different media. The detection methods utilize the change of the sound wave cloud chart or the temperature field to judge whether the concrete medium of the pile body is uniform or not.
However, in the above method, in the engineering implementation, a lot of complicated preparation and treatment works such as the maintenance age of the concrete, accurate calculation of the temperature field of the hydration heat of the concrete, reduction of the sensing error of the monitoring optical fiber, and the like need to be considered, which directly or indirectly increase the detection cost and reduce the operability of the detection at the construction site.
Disclosure of Invention
Therefore, the system and the construction method for detecting the integrity of the pile body of the underwater cast-in-place pile are needed to be provided, which have the advantages of convenience in detection, strong operability and capability of saving the detection cost, aiming at the problems of complex detection, high detection cost and poor operability of the detection method.
The utility model provides a system for detecting pile body integrality of bored concrete pile under water, be equipped with the steel reinforcement cage in the bored concrete pile the inside edge that is equipped with of steel reinforcement cage the reservation hollow pipeline that the direction of height of steel reinforcement cage extends, the system that detects pile body integrality of bored concrete pile under water includes:
the copper wire is connected with the reinforcement cage in an adhesive mode, one end of the copper wire extends out of the cast-in-place pile, and the other end of the copper wire extends upwards and extends out of the cast-in-place pile after being arranged in a downward spiral mode along the inner ring of the reinforcement cage;
the two ends of the copper wire are connected with the current detector;
the height adjusting part is positioned above the cast-in-place pile;
the strong magnet is connected with the height adjusting part through an adjusting rope, is positioned in the reserved hollow pipeline and can adjust the moving speed of the strong magnet in the reserved hollow pipeline through the height adjusting part.
In one embodiment, the surface of the copper wire is coated with a layer of insulating material.
In one embodiment, the distance between every two adjacent turns of the copper wire is equal.
In one embodiment, the center line of the reserved hollow pipeline is coincident with the center line of the reinforcement cage.
In one embodiment, the height adjusting part includes a roller, a motor and a controller, one end of the adjusting rope is wound around the roller, the other end of the adjusting rope is connected with the strong magnet, and the roller and the controller are connected with the motor.
The construction method of the system for detecting the integrity of the pile body of the underwater cast-in-place pile comprises the following steps:
doping magnetic powder into concrete, and uniformly distributing the magnetic powder in the concrete;
manufacturing a reinforcement cage, wherein one end of a copper conductor extends out of a cast-in-place pile, the other end of the copper conductor is spirally arranged downwards along an inner ring of the reinforcement cage, then extends upwards and extends out of the cast-in-place pile, and a reserved hollow pipeline is arranged in the reinforcement cage;
lowering the reinforcement cage bonded with the copper conductor to a preset position;
lowering a strong magnet into the reserved hollow pipeline;
adopting concrete doped with magnetic powder to carry out underwater concrete pouring, and adjusting the rising speed of the strong magnet in the reserved hollow pipeline through a height adjusting part;
and the current detector is connected to the two ends of the copper conductor and monitors the change of the current, and detects whether the pile body of the underwater cast-in-place pile is complete or not by observing the stable condition of the current.
In one embodiment, in the step of performing underwater concrete pouring by using the concrete doped with magnetic powder, the rising speed of the strong magnet in the reserved hollow pipeline is adjusted by the height adjusting part, and the rising speed of the strong magnet in the reserved hollow pipeline is synchronous with the rising speed of the concrete liquid level in the pouring pile.
In one embodiment, after the cast-in-place pile is cast and formed, the strong magnet is placed down through the reserved hollow pipeline, and the pile body of the cast-in-place pile is detected.
In one embodiment, the magnetic powder is a sendust magnetic powder.
In one embodiment, the strong magnet is a neodymium iron boron strong magnet.
When the system for detecting the integrity of the underwater cast-in-place pile body is used, a proper amount of magnetic powder is doped into concrete, the magnetic conductivity of the concrete is increased, the moving speed of the strong magnet in the cast-in-place pile is adjusted through the height adjusting part, the change condition of current is monitored by the current detector, and then whether the pile body is complete or not is judged. The system for detecting the integrity of the underwater cast-in-place pile body utilizes the electromagnetic induction principle to change the magnetic conductivity of concrete, judges whether other media (sludge) are mixed in the underwater concrete when pouring by detecting the current generated by cutting the magnetic induction lines by the strong magnet, has simple detection principle and strong operability, can adapt to complex construction site environment, is suitable for any time period when pouring the concrete or after forming, has wider application range, and simultaneously has low manufacturing cost and is favorable for saving the detection cost. In addition, the construction method of the system for detecting the integrity of the pile body of the underwater cast-in-place pile is convenient to operate and suitable for popularization and application.
Drawings
FIG. 1 is a top view of an embodiment of an injection pile;
fig. 2 is an application scenario diagram of the system for detecting the integrity of the pile body of the underwater cast-in-place pile according to an embodiment;
fig. 3 is a diagram of another application scenario of the system for detecting the integrity of the pile body of the underwater cast-in-place pile according to an embodiment.
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 invention provides a method for detecting the integrity of a water tank cast-in-place pile body by utilizing an electromagnetic induction principle. Compared with the traditional sound wave detection method and the temperature field induction method, the detection method is simple and convenient to operate, is quick in detection process, and can be used for detecting in each stage of pile forming. The system for detecting the integrity of the pile body of the underwater cast-in-place pile and the construction method of the invention will be described in detail with reference to the accompanying drawings.
As shown in fig. 1 and fig. 2, a steel reinforcement cage 2 is arranged in a cast-in-place pile 1, a reserved hollow pipeline 3 extending along the height direction of the steel reinforcement cage 2 is arranged inside the steel reinforcement cage 2, a system for detecting the integrity of a pile body of the underwater cast-in-place pile 1 in one embodiment includes a copper wire 10, a current detector 12, a height adjusting portion 14 and a strong magnet 16, the copper wire 10 is connected with the steel reinforcement cage 2 in an adhesive manner, one end of the copper wire 10 extends out of the cast-in-place pile 1, the other end of the copper wire extends upwards and extends out of the cast-in-place pile 1 after being spirally arranged downwards along an inner ring of the steel reinforcement cage 2, two ends of the copper wire 10 are connected with the current detector 12, the height adjusting portion 14 is located above the cast-in-place pile 1, the strong magnet 16 is connected with the height adjusting portion 14 through an.
When the system for detecting the integrity of the pile body of the underwater cast-in-place pile 1 is used, the magnetic conductivity of the concrete 4 is increased by doping a proper amount of magnetic powder into the concrete 4, the moving speed of the strong magnet 16 in the cast-in-place pile 1 is adjusted by the height adjusting part 14, the change condition of current is monitored by the current detector 12, and then whether the pile body is complete or not is judged. The system for detecting the integrity of the pile body of the underwater cast-in-place pile 1 utilizes the electromagnetic induction principle, the magnetic conductivity of concrete 4 is changed, whether other media (sludge) are mixed in the water tank concrete 4 when pouring is judged by detecting the current generated by the strong magnet 16 cutting magnetic induction lines, the detection principle is simple and strong in operability, the system can adapt to complex construction site environments, and is suitable for any time period when pouring the concrete 4 or after forming, the wide application range is provided, meanwhile, the system for detecting the integrity of the pile body of the underwater cast-in-place pile 1 is low in manufacturing cost, and the detection cost is favorably saved.
The copper wire 10 functions so that the strong magnet 16 generates current on the copper wire 10 when cutting the magnetic induction lines. In the present embodiment, the surface of the copper wire 10 is covered with an insulating material layer to avoid the copper wire 10 and the concrete 4 from conducting electricity when the underwater concrete 4 is poured. After the reinforcement cage 2 is manufactured, the copper wire 10 coated with the insulating material layer is arranged around the inner ring of the reinforcement cage 2, and the insulating material layer of the copper wire 10 is firmly bonded with the main reinforcement of the reinforcement cage 2 by using the super glue. Copper conductor 10 winds on steel reinforcement cage 2 along the inner circle spiral of steel reinforcement cage 2 to extend to the bottom of steel reinforcement cage 2, then along the vertical main muscle of steel reinforcement cage 2 to the pile bolck straight line extension of bored concrete pile 1, until stretching out outside the stake of bored concrete pile 1. So arranged, both ends of the copper wire 10 can be extended out of the same end of the cast-in-place pile 1 for connection with the current detector 12. In addition, the insulating material layer covering the copper conductor 10 and the super glue for bonding the insulating material layer and the reinforcement cage 2 are all common operation methods in the field, and are not limited herein.
Since the copper wire 10 is spirally wound around the reinforcement cage 2 along the inner circumference of the reinforcement cage 2, a plurality of turns of the copper wire 10 are formed at the inner circumference of the reinforcement cage 2. In the present embodiment, the distance between every two adjacent turns of the copper wire 10 is equal. The copper wires 10 are equidistantly arranged on the reinforcement cage 2, so that the current generated on the copper wires 10 by the strong magnet 16 when the magnetic induction wires are cut is more stable.
With continued reference to fig. 1 and 2, a reserved hollow pipe 3 extending along the height direction of the reinforcement cage 2 is disposed inside the reinforcement cage 2, and the reserved hollow pipe 3 is for accommodating a strong magnet 16, so that the strong magnet 16 can move in the cast-in-place pile 1. The reserved empty pipeline 3 can be arranged in the reinforcement cage 2 after the reinforcement cage 2 is manufactured, and then is placed into the cast-in-place pile 1 along with the reinforcement cage 2. The reserved hollow pipeline 3 can be a PVC pipe, is poured in the pile body after the pile body is poured, and is convenient for detecting the forming quality of the concrete 4 of the cast-in-place pile 1 after the cast-in-place pile 1 is poured and formed. Further, in the present embodiment, the center line of the reserved hollow pipe 3 coincides with the center line of the reinforcement cage 2. Namely, the reserved hollow pipeline 3 is positioned at the center of the reinforcement cage 2, and the current generated in the copper conductor 10 is ensured to be uniform.
During the detection process, the strong magnet 16 moves along the reserved hollow pipeline 3, and generates relative displacement between the strong magnet 16 and the surrounding copper wire 10, so as to cause the surrounding copper wire 10 to generate current. When the strong magnet 16 moves at a constant speed, the magnetic induction lines are cut at a constant speed, and a constant current is generated on the surrounding copper wire 10. In the present embodiment, the moving speed of the strong magnet 16 in the empty pipe is adjusted and controlled by the height adjusting part 14. The adjusting cord 18 has one end connected to the ferromagnetic member 16 and the other end connected to the height adjusting portion 14. Any height adjusting unit 14 that can extend or contract the adjusting rope 18 and further move the ferromagnetic member 16 in the hollow reserve pipe 3 can be used in the present invention. In this embodiment, the height adjusting unit 14 includes a roller, a motor, and a controller, one end of the adjusting rope 18 is wound around the roller, the other end is connected to the strong magnet 16, and the roller and the controller are connected to the motor. The motor is controlled by the controller to start, then the motor drives the roller to rotate, and further the number of winding turns of the adjusting rope 18 on the roller is controlled, so that the strong magnet 16 can move in the reserved hollow pipeline 3. In other embodiments, the rotation of the roller may be controlled manually.
The construction method of the system for detecting the integrity of the pile body of the underwater cast-in-place pile 1 will be described below with reference to the accompanying drawings.
As shown in fig. 2, a construction method of the system for detecting integrity of a pile body of an underwater cast-in-place pile 1 of an embodiment includes the following steps:
step one, magnetic powder is doped into the concrete 4, and the magnetic powder is uniformly distributed in the concrete 4. After the magnetic powder 4 is added to the concrete 4, the mixture is stirred so that the magnetic permeability of each part of the concrete 4 is the same. The magnetic powder is doped into the concrete 4 to increase the magnetic permeability of the concrete 4, so that the magnetic permeability of the concrete 4 is obviously different from the magnetic permeability of the soil around the cast-in-place pile 1. Wherein, the magnetic powder of high magnetic conductivity all can be as in the medium adds concrete 4, in this embodiment, the magnetic powder is the magnetic powder of sendust, and this magnetic powder has higher effective magnetic conductivity to have good magnetic stability, can not cause the influence to concrete 4's stability after adding concrete 4. It should be noted that the amount of the magnetic powder added may be selected according to actual construction conditions, as long as the magnetic permeability of the concrete 4 can be significantly different from the soil around the pile, and is not limited herein.
And step two, manufacturing a reinforcement cage 2, wherein one end of a copper conductor 10 extends out of the cast-in-place pile 1, the other end of the copper conductor extends upwards and extends out of the cast-in-place pile 1 after being spirally arranged downwards along the inner ring of the reinforcement cage 2, and a reserved hollow pipeline 3 is arranged in the reinforcement cage 2. The outer wall of copper conductor 10 coats and has the insulating material layer, adopts the super glue to bond firmly with the main muscle of steel reinforcement cage 2 with the insulating material layer of copper conductor 10.
And step three, lowering the reinforcement cage 2 bonded with the copper conductor 10 to a preset position. After the construction of bored concrete pile 1 is accomplished, transfer steel reinforcement cage 2 to preset position to set up the reservation empty pipe way 3 that is used for transferring strong magnet 16 in steel reinforcement cage 2's inside.
And step four, lowering the strong magnet 16 into the reserved hollow pipeline 3. The ferromagnetic body 16 is connected to the height adjusting portion 14 via an adjusting cord 18, and the moving speed of the ferromagnetic body 16 in the reserved empty pipe 3 is adjusted by the height adjusting portion 14. Generally, the strong magnet 16 is first lowered to the bottom of the empty pipe 3, i.e. the bottom of the cast-in-place pile 1, and then lifted synchronously with the rise of the concrete level.
And fifthly, pouring the underwater concrete 4 by adopting the concrete 4 doped with the magnetic powder, and adjusting the rising speed of the strong magnet 16 in the reserved hollow pipeline 3 by the height adjusting part 14. In the pouring process, the highest position of the strong magnet 16 is lower than the height of the liquid level of the concrete 4, so that the pouring quality of the concrete 4 can be monitored in real time. In this embodiment, the rising speed of the strong magnet 16 in the pre-empty pipe 3 is synchronized with the rising speed of the concrete level 4 in the cast-in-place pile 1. The speed at which the liquid level of the concrete 4 rises can be calculated from the volume of the cast-in-place pile 1 and the casting amount of the concrete 4, for example, the inner diameter of the cast-in-place pile 1 is known, and the speed at which the liquid level of the concrete 4 rises in the cast-in-place pile 1 can be calculated from the volume of the cast-in-place concrete 4 and the casting speed. Then the rising speed of the strong magnet 16 in the reserved hollow pipeline 3 is adjusted by adjusting the length of the adjusting rope 18. The rising speed of the strong magnet 16 is kept consistent with the rising speed of the liquid level of the concrete 4 in the cast-in-place pile 1, the casting quality of the concrete 4 can be monitored in real time in the casting process of the concrete 4, and whether other media are mixed in the concrete 4 in the casting process can be judged in time. When other media are mixed, for example, sludge around the pile foundation of the concrete 4 is mixed into the cast-in-place pile 1 and forms a sludge inclusion area 5 in the cast-in-place pile 1, as shown in fig. 3, the magnetic permeability of the sludge is significantly different from that of the cast-in-place concrete 4, so that the current on the copper conductor 10 is significantly fluctuated, and the condition that the pile body has sludge inclusion is judged. During the pouring of concrete 4, the integrity of the poured portion of concrete 4 can be checked by repeatedly lowering and lifting the strong magnet 16.
And step six, connecting the current detector 12 to the two ends of the copper conductor 10, monitoring the change of the current, and detecting whether the pile body of the underwater cast-in-place pile 1 is complete or not by observing the stable condition of the current. The current detector 12 is used to detect and record the current flowing in the copper wire 10, when the strong magnet 16 moves at a constant speed and the magnetic induction wire is cut at a constant speed, a constant current is generated around the copper wire 10, and at this time, it shows that the current on the current detector 12 has no fluctuation or small fluctuation. As shown in fig. 3, when a mud-trapping situation occurs, due to the change of the magnetic permeability, when the strong magnet 16 passes through the mud-trapping area 5, the current on the current detector 12 fluctuates significantly, and it is determined that the mud-trapping situation exists in the pile body.
The electromagnetic induction phenomenon is caused when the copper wire 10 cuts the magnetic induction line of the strong magnet 16, and the generated electromotive force formula is as follows: where E denotes an induced electromotive force, B denotes a magnetic induction intensity, l denotes a length of the copper wire 10, and v denotes a moving speed of the ferromagnetic body 16. The current I generated in the copper wire 10 is E/R Blv/R, where R is the resistance of the copper wire 10. From this equation, it can be seen that the magnitude of the current on the copper wire 10 is only related to the moving speed, i.e., when the moving speed of the strong magnet 16 is kept constant, the current on the copper wire 10 is also kept constant. In this embodiment, the current detector 12 does not need to detect a specific value of the current, and only needs to monitor the fluctuation of the current on the copper wire 10. That is, when the velocity v at which the ferromagnetic body 16 moves is constant, the generated current should be constant. And then the complete condition of the pile body is judged according to the fluctuation condition of the current.
In addition, the construction method of the system for detecting the integrity of the pile body of the underwater cast-in-place pile 1 further comprises the following steps: after the cast-in-place pile 1 is poured and formed, the strong magnet 16 is placed downwards through the reserved hollow pipeline 3, and the pile body of the cast-in-place pile 1 is detected. After cast-in-place pile 1 is poured and formed, reserved hollow pipeline 3 is poured in cast-in-place pile 1, and consequently, strong magnet 16 can be put down in reserved hollow pipeline 3, and then whether there is quality defects such as segregation, mud clamping, cavity in concrete 4 after the judgement shaping. Namely, the detection method can detect the underwater concrete 4 in the pouring process and after the forming process respectively, the detection in the pouring process can provide a reference basis for the pouring construction effect of the underwater concrete 4, and the detection after the forming process can provide a judgment basis for the forming quality of the concrete 4.
In the present embodiment, the ferromagnetic material 16 is a neodymium-iron-boron ferromagnetic material. In other embodiments, the strong magnet 16 may be other magnetic materials.
In summary, the construction method of the system for detecting the integrity of the pile body of the underwater cast-in-place pile 1 has the following advantages:
(1) whether the pile body of the cast-in-place pile 1 is complete or not can be rapidly detected by observing the stability of the current in the current detector 12. For example, when the current is constant or the fluctuation is small, the pile body is complete. And when the current fluctuates remarkably, the quality defects such as mud inclusion, separation or cavities and the like of the pile body can exist.
(2) The integrity of the pile body can be detected in the pouring process of the concrete 4 or any time period after the forming, the maintenance period of the concrete 4 does not need to be considered, and the detection convenience is improved.
(3) The detection principle is simple and strong in operability, and can be adapted to complex construction site environments.
(4) The anti-interference capability is strong, the number of embedded measuring devices is small, and the reliability is strong in practical operation.
(5) The cost is low, and the detection cost is saved.
(6) The application range is wide, the construction method of the system for detecting the integrity of the pile body of the underwater cast-in-place pile 1 can be suitable for detecting the integrity of the pile foundation, and the method can be suitable for any underwater concrete 4 pouring engineering.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. The utility model provides a system for detecting pile body integrality of bored concrete pile under water, be equipped with the steel reinforcement cage in the bored concrete pile the inside edge that is equipped with of steel reinforcement cage the reservation empty pipeline that the direction of height of steel reinforcement cage extends, a serial communication port, the system that detects pile body integrality of bored concrete pile under water includes:
the copper wire is connected with the reinforcement cage in an adhesive mode, one end of the copper wire extends out of the cast-in-place pile, and the other end of the copper wire extends upwards and extends out of the cast-in-place pile after being arranged in a downward spiral mode along the inner ring of the reinforcement cage;
the two ends of the copper wire are connected with the current detector;
the height adjusting part is positioned above the cast-in-place pile;
the strong magnet is connected with the height adjusting part through an adjusting rope, is positioned in the reserved hollow pipeline and can adjust the moving speed of the strong magnet in the reserved hollow pipeline through the height adjusting part.
2. The system for detecting the integrity of an underwater cast-in-place pile shaft as claimed in claim 1, wherein the surface of the copper conductor is coated with an insulating material layer.
3. The system for detecting the integrity of an underwater cast-in-place pile body according to claim 1, wherein the distance between every two adjacent turns of the copper wire is equal.
4. The system for detecting the integrity of an underwater cast-in-place pile body as recited in claim 1, wherein a centerline of the reserved hollow pipe coincides with a centerline of the reinforcement cage.
5. The system for detecting the integrity of the pile body of an underwater cast-in-place pile according to any one of claims 1 to 4, wherein the height adjusting part comprises a roller, a motor and a controller, one end of the adjusting rope is wound on the roller, the other end of the adjusting rope is connected with the strong magnet, and the roller and the controller are connected with the motor.
6. The construction method of the system for detecting the integrity of the pile body of the underwater cast-in-place pile as claimed in any one of claims 1 to 5, is characterized by comprising the following steps:
doping magnetic powder into concrete, and uniformly distributing the magnetic powder in the concrete;
manufacturing a reinforcement cage, wherein one end of a copper conductor extends out of a cast-in-place pile, the other end of the copper conductor is spirally arranged downwards along an inner ring of the reinforcement cage, then extends upwards and extends out of the cast-in-place pile, and a reserved hollow pipeline is arranged in the reinforcement cage;
lowering the reinforcement cage bonded with the copper conductor to a preset position;
lowering a strong magnet into the reserved hollow pipeline;
adopting concrete doped with magnetic powder to carry out underwater concrete pouring, and adjusting the rising speed of the strong magnet in the reserved hollow pipeline through a height adjusting part;
and the current detector is connected to the two ends of the copper conductor and monitors the change of the current, and detects whether the pile body of the underwater cast-in-place pile is complete or not by observing the stable condition of the current.
7. The method for constructing a system for testing the integrity of a pile body of an underwater cast-in-place pile as claimed in claim 6, wherein in the step of performing underwater concrete casting using the concrete doped with magnetic powder, the rising speed of the strong magnet in the reserved hollow pipe is adjusted by the height adjusting part, and the rising speed of the strong magnet in the reserved hollow pipe is synchronized with the rising speed of the concrete liquid level in the cast-in-place pile.
8. The construction method of the system for detecting the integrity of the pile body of the underwater cast-in-place pile according to claim 6, further comprising the following steps:
and after the cast-in-place pile is poured and molded, the strong magnet is put down through the reserved hollow pipeline, and the pile body of the cast-in-place pile is detected.
9. The construction method of the system for detecting the integrity of the pile body of the underwater cast-in-place pile according to claim 6, wherein the magnetic powder is sendust magnetic powder.
10. The construction method of the system for detecting the integrity of the pile body of the underwater cast-in-place pile according to any one of claims 6 to 9, wherein the strong magnet is a neodymium iron boron strong magnet.
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| CN202011576750.5A CN112709267B (en) | 2020-12-28 | 2020-12-28 | System and construction method for detecting integrity of pile body of underwater cast-in-place pile |
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