CN110725347A - Real-time detection method and system for broken pile in concrete cast-in-place pile construction process - Google Patents
Real-time detection method and system for broken pile in concrete cast-in-place pile construction process Download PDFInfo
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- CN110725347A CN110725347A CN201911005339.XA CN201911005339A CN110725347A CN 110725347 A CN110725347 A CN 110725347A CN 201911005339 A CN201911005339 A CN 201911005339A CN 110725347 A CN110725347 A CN 110725347A
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- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
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Abstract
The invention discloses a real-time detection system for pile breakage in a concrete cast-in-place pile construction process, which comprises a temperature sensing optical fiber, an optical fiber sensing detection unit and a real-time data analysis processing unit, and also discloses a real-time detection method, which comprises the following steps of arranging the temperature sensing optical fiber in a casting area of a cast-in-place pile, monitoring the temperature of the casting area in real time through the temperature sensing optical fiber, sending early warning information when the difference value between the temperature value t1 acquired at a certain position of the temperature sensing optical fiber and the temperature value t2 acquired at other positions with the vertical distance of s exceeds a preset difference value △ t, and adopting the technical scheme, realizing the temperature monitoring of a continuous interval on the cast-in-place pile through the temperature sensing optical fiber, and judging whether pile breakage exists or not through the temperature change condition of the cast-in-place pile, wherein the pile breakage has the advantages of many temperature monitoring points.
Description
Technical Field
The invention relates to a real-time detection method and a real-time detection system for broken piles in the construction process of a concrete cast-in-place pile, and belongs to the technical field of concrete construction.
Background
At present, cast-in-place pile foundations are often adopted in the design and construction of foundation works such as bridge works. The cast-in-place pile has the advantages of good bearing capacity, simplified construction, shortened construction period, reduced construction cost, simple required equipment and convenient operation, but the problem of pile breakage in the construction process is a difficult problem which always puzzles construction units. The pile breaking means that the mixture of the slurry and the cement mortar separates the concrete at the upper section and the lower section of the cast-in-place pile, so that the concrete is deteriorated or the cross section is damaged, and the pile breaking is realized. Pile breakage is a serious quality problem in the construction process, and if the pile is not properly treated, the pile cannot be used, so that great care needs to be taken to prevent pile breakage during pouring. The existing common method for detecting broken pile is an ultrasonic detection method for concrete cast-in-place pile, which is to embed a plurality of acoustic pipes parallel to the longitudinal axis of the pile in advance, and directly extend an ultrasonic probe into the concrete of the pile body through the acoustic pipes to detect point by point and segment by segment. The basic principle is that the existence of defects is reflected according to the change of the propagation time, the propagation speed and the energy when the ultrasonic pulse passes through the tested concrete, and the compression strength and the quality uniformity of the concrete are estimated. The ultrasonic detection method is a post-detection method, generally the detection is carried out about 7 days after pile forming, and the detection cannot be carried out in the construction process of the cast-in-place pile.
Disclosure of Invention
Therefore, the present invention is directed to a method and a system for detecting pile breakage in a concrete cast-in-place pile construction process in real time, which can monitor the temperature of a cast-in-place pile in a continuous section through a temperature sensing optical fiber, and determine whether pile breakage exists according to the temperature change condition of the cast-in-place pile.
In order to achieve the purpose, the method for detecting the broken pile in the concrete cast-in-place pile construction process in real time comprises the following steps:
arranging a temperature sensing optical fiber in a pouring area of the cast-in-place pile, wherein the temperature sensing optical fiber at least extends in the axial direction of the cast-in-place pile;
after concrete is poured, monitoring the temperature of a pouring area in real time through a temperature sensing optical fiber;
when the difference value between the temperature value t1 acquired at a certain position of the temperature sensing optical fiber and the temperature value t2 acquired at other positions with the vertical spacing s exceeds the preset difference value △ t, early warning information is sent out.
And after the temperature sensing optical fibers are arranged in the pouring area, establishing a 3D model corresponding to the pouring area and the arrangement direction of the temperature sensing optical fibers.
When the difference between the temperature value t1 acquired at a certain position of the temperature sensing optical fiber and the temperature value t2 acquired at other positions with the vertical spacing s exceeds a preset difference △ t, marking the two positions in the 3D model.
The temperature sensing optical fiber extends spirally along the axial direction of the cast-in-place pile.
The invention also provides a real-time detection system for broken piles in the construction process of the cast-in-place concrete piles, which comprises the following steps:
the temperature sensing optical fiber is arranged in a pouring area of the concrete cast-in-place pile;
the optical fiber sensing detection unit is used for receiving the optical signal sent by the sensing optical fiber, analyzing the optical signal and obtaining temperature information data of each part of the optical fiber, and is used for sending the temperature information data to the real-time data analysis processing unit;
and the real-time data analysis processing unit is used for sending out early warning information when the difference value between the temperature value t1 acquired at a certain position of the temperature sensing optical fiber and the temperature value t2 acquired at other positions with the vertical distance s exceeds a preset difference value △ t.
And the real-time data analysis processing unit is used for establishing a 3D model corresponding to the arrangement direction of the pouring area and the temperature sensing optical fiber.
The real-time data analysis processing unit is used for marking and displaying the two positions in the 3D model when the difference value between the temperature value t1 acquired at one position of the temperature sensing optical fiber and the temperature value t2 acquired at other positions with the vertical distance s exceeds a preset difference value △ t.
By adopting the technical scheme, compared with the prior art, the real-time detection method and the real-time detection system for the broken pile in the construction process of the cast-in-place concrete pile have the following beneficial effects:
1. temperature monitoring in a continuous interval is realized on the cast-in-place pile through the temperature sensing optical fiber, and whether broken piles exist or not is judged through the temperature change condition of the cast-in-place pile, so that the cast-in-place pile has the advantages of multiple temperature monitoring points, real time, high accuracy and the like.
2. The 3D modeling is carried out on the arrangement trend of the concrete pouring area and the temperature sensing optical fiber, the early warning can be intuitively observed, and the positive effect on determining the position of the broken pile is achieved.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of a real-time broken pile detection system in a concrete cast-in-place pile construction process.
Fig. 2 is a schematic structural diagram of the temperature sensing optical fiber penetrating through a concrete layer and a non-concrete layer.
Detailed Description
The invention is described in further detail below with reference to the figures and the detailed description.
The invention discloses a real-time detection system for pile breakage in a concrete cast-in-place pile construction process.
As shown in fig. 1, the temperature sensing optical fiber 1 is arranged in a cast-in-place pile concrete pouring area and is laid along the concrete reinforcement cage 4 in a spiral extending manner. The optical fiber sensing technology is widely applied at present, and mainly utilizes the change of light scattering or nonlinear effect in an optical fiber along with the external environment to sense based on the reflection and interference of light. According to different detected optical signals, the distributed optical fiber sensing technology is divided into three types based on Rayleigh scattering, Raman scattering and Brillouin scattering in optical fibers; according to the signal analysis method, the distributed optical fiber sensing technology can be divided into a time domain-based distributed optical fiber sensing technology and a frequency domain-based distributed optical fiber sensing technology. In a distributed optical fiber sensing system, an optical fiber is both an information transmission medium and a signal sensing unit. In the system, the whole optical fiber is a sensing unit, and sensing points are continuously distributed, so that the sensing method can measure information at any position along the optical fiber. The distributed optical fiber sensing technology is particularly suitable for monitoring parameters such as temperature, vibration and stress of a concrete structure body. The distributed optical fiber sensing technology can monitor all-round health parameters of the concrete structure in the whole life cycle of the concrete structure, and can monitor the temperature change condition, the pressure-bearing load condition and the vibration deformation condition of the concrete structure, and concrete structure cracks and defects caused by environmental erosion, material aging and the like. The temperature sensing optical fiber is one of the sensing optical fibers. The optical fiber sensing detection unit is used for receiving the optical signal sent by the sensing optical fiber, analyzing the optical signal, obtaining temperature information data of each part of the optical fiber, and sending the temperature information data to the real-time data analysis processing unit. In the present invention, as shown in fig. 2, when pile breakage occurs, since the temperature sensing optical fiber 1 passes through the concrete layer 2 and the non-concrete layer 3 (for example, a mixture of slurry and cement mortar), and the material sources of the concrete layer and the non-concrete layer are different, the temperature changes of the two layers will be different, and the temperature difference can be captured by the temperature sensing optical fiber, so that pile breakage can be timely discovered.
The real-time data analysis processing unit is used for sending out early warning information when the difference value between a temperature value t1 acquired at a certain position of the temperature sensing optical fiber and a temperature value t2 acquired at other positions with a vertical distance s exceeds a preset difference value △ t, in order to observe a pouring area more intuitively, the real-time data analysis processing unit is also used for establishing a 3D model corresponding to the pouring area and the arrangement trend of the temperature sensing optical fiber, and marking and displaying the two positions in the 3D model when the difference value between a temperature value t1 acquired at a certain position of the temperature sensing optical fiber and a temperature value t2 acquired at other positions with a vertical distance s exceeds a preset difference value △ t.
Therefore, the invention also relates to a real-time detection method for broken piles in the construction process of the concrete cast-in-place piles, which comprises the following steps:
arranging a temperature sensing optical fiber in a pouring area of the cast-in-place pile, wherein the temperature sensing optical fiber at least extends in the axial direction of the cast-in-place pile;
after concrete is poured, monitoring the temperature of a pouring area in real time through a temperature sensing optical fiber;
when the difference value between the temperature value t1 acquired at a certain position of the temperature sensing optical fiber and the temperature value t2 acquired at other positions with the vertical spacing s exceeds the preset difference value △ t, early warning information is sent out.
And after the temperature sensing optical fibers are arranged in the pouring area, establishing a 3D model corresponding to the pouring area and the arrangement direction of the temperature sensing optical fibers.
When the difference between the temperature value t1 acquired at a certain position of the temperature sensing optical fiber and the temperature value t2 acquired at other positions with the vertical spacing s exceeds a preset difference △ t, marking the two positions in the 3D model.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (7)
1. A real-time detection method for broken piles in the construction process of concrete cast-in-place piles is characterized by comprising the following steps:
arranging a temperature sensing optical fiber in a pouring area of the cast-in-place pile, wherein the temperature sensing optical fiber at least extends in the axial direction of the cast-in-place pile;
after concrete is poured, monitoring the temperature of a pouring area in real time through a temperature sensing optical fiber;
when the difference value between the temperature value t1 acquired at a certain position of the temperature sensing optical fiber and the temperature value t2 acquired at other positions with the vertical spacing s exceeds the preset difference value △ t, early warning information is sent out.
2. The method for detecting pile breakage in the concrete cast-in-place pile construction process according to claim 1, characterized in that: and after the temperature sensing optical fibers are arranged in the pouring area, establishing a 3D model corresponding to the pouring area and the arrangement direction of the temperature sensing optical fibers.
3. The method for real-time detection of pile breakage during concrete pouring pile construction according to claim 2, wherein the temperature sensing optical fiber is used for marking a certain position in the 3D model when the difference between the temperature value t1 collected at the position and the temperature value t2 collected at other positions with the vertical distance s exceeds a preset difference △ t.
4. A real-time detection method of a broken pile in a concrete cast-in-place pile construction process according to any one of claims 1 to 3, characterized by: the temperature sensing optical fiber extends spirally along the axial direction of the cast-in-place pile.
5. The utility model provides a real-time detection system of broken pile in concrete bored concrete pile work progress which characterized in that includes:
the temperature sensing optical fiber is arranged in a pouring area of the concrete cast-in-place pile;
the optical fiber sensing detection unit is used for receiving the optical signal sent by the sensing optical fiber, analyzing the optical signal and obtaining temperature information data of each part of the optical fiber, and is used for sending the temperature information data to the real-time data analysis processing unit;
and the real-time data analysis processing unit is used for sending out early warning information when the difference value between the temperature value t1 acquired at a certain position of the temperature sensing optical fiber and the temperature value t2 acquired at other positions with the vertical distance s exceeds a preset difference value △ t.
6. The system for detecting pile breakage in the concrete cast-in-place pile construction process according to claim 5, wherein: and the real-time data analysis processing unit is used for establishing a 3D model corresponding to the arrangement direction of the pouring area and the temperature sensing optical fiber.
7. The system of claim 6, wherein the real-time data analysis and processing unit is configured to mark and display a temperature value t1 collected at a certain position of the temperature sensing optical fiber and a temperature value t2 collected at another position with a vertical distance s in the 3D model when the difference between the two temperature values exceeds a preset difference △ t.
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| CN111561970A (en) * | 2020-06-10 | 2020-08-21 | 江苏元华光电科技有限公司 | Concrete pouring monitoring method for steel-concrete composite column |
| CN111889860A (en) * | 2020-07-28 | 2020-11-06 | 绍兴裕铭机械科技有限公司 | Emergency stop device of reinforcement cage seam welder |
| CN112922050A (en) * | 2021-02-01 | 2021-06-08 | 上海建工二建集团有限公司 | Method and device for detecting integrity of foundation pile |
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