CN210288501U - Device for detecting thickness of pile body steel bar protection layer - Google Patents

Device for detecting thickness of pile body steel bar protection layer Download PDF

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Publication number
CN210288501U
CN210288501U CN201920095615.5U CN201920095615U CN210288501U CN 210288501 U CN210288501 U CN 210288501U CN 201920095615 U CN201920095615 U CN 201920095615U CN 210288501 U CN210288501 U CN 210288501U
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pile body
steel bar
thickness
sensor array
pile
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周治国
孙晓立
叶东昌
卞德存
邵继喜
张午阳
杨丹
江涌波
温小凡
吴卓林
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Guangzhou Municipal Engineering Testing Co
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Guangzhou Municipal Engineering Testing Co
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Abstract

The utility model discloses a detect device of pile body steel bar protective layer thickness utilizes ultrasonic sensor to carry out ultrasonic detection to the pile body, confirms distance d between pile body outer wall and the sensor array1The electromagnetic sensor is used for carrying out magnetic induction detection on the reinforcement cage to determine the distance d between the reinforcement cage and the sensor array2And then d is represented by the formula1‑d2And the thickness d of the protective layer of the reinforcing steel bar at different positions of the pile body is calculated by combining with the data of the depth gauge, so that the thickness of the protective layer of the reinforcing steel bar of the whole pile body is quickly and completely detected, the operation is simple and convenient, and the quality of the pile body can be synchronously detected by ultrasonic scanning and electromagnetic induction scanning, and the quality of the pile body is detectedThe method has accurate measurement result and high reliability, is particularly suitable for the cast-in-place pile with rough outer wall of the pile body, and plays a certain role in promoting the timely discovery of related quality problems and the guarantee of pile forming quality.

Description

Device for detecting thickness of pile body steel bar protection layer
Technical Field
The utility model belongs to the technical field of the foundation engineering test, especially, relate to a detect device of pile body steel bar protection layer thickness.
Background
In order to ensure the quality of pile foundation engineering, the bearing capacity of a single pile is required to be detected. At present, a static load test is the most intuitive and reliable method for detecting the bearing capacity of a single pile. Before the vertical uplift static load test of a traditional single pile, a pile cap needs to be manufactured on the pile top of the uplift pile, a main rib of the uplift pile extends into the pile cap on the upper portion of the pile top, and uplift force is transmitted to a test pile through the pile cap. The pile cap is usually manufactured by spending certain manpower and material resources, and meanwhile, the test time is also increased.
The thickness of the pile body steel bar protective layer, namely the vertical distance from the outer edge of the stressed main steel bar in the pile body to the surface of concrete, directly determines the impact resistance and the corrosion resistance of the steel bar in the pile body, and is one of important factors for ensuring the normal use of the foundation pile. The specification GB 50204 and 2015 stipulates that the thickness of the steel bar protective layer of the structural entity at the important part must be detected, and projects with the thickness of the steel bar protective layer not meeting the standard are not accepted. Therefore, the detection work of the thickness of the steel bar protective layer must be strengthened, and the detection precision is improved.
For the thickness of the steel bar protective layer, the most common detection method at present is an electromagnetic induction method, in the method, an instrument sensor is utilized to generate an alternating electromagnetic field, the electromagnetic field acts on a structural member to be detected, when the steel bar is in the interior, a stronger induced electromagnetic field is generated, the instrument sensor converts an induced electromagnetic field signal into an electric signal, and therefore the position of the steel bar can be judged, and the thickness of the steel bar protective layer can be determined.
The thickness of the steel bar protection layer is of great importance to the durability of the pile foundation, and for a long pile body, an internal steel bar cage is easy to deflect, so that the thickness of the steel bar protection layer needs to be detected urgently. However, the electromagnetic method is not suitable for detecting the thickness of the steel bar protection layer of the pile body, mainly because the length of the pile body reaches dozens of meters to dozens of meters, most of the pile body is positioned in rock soil, and the thickness of the steel bar protection layer of the whole pile body is difficult to obtain by simply utilizing the electromagnetic method. At present, the thickness of a pile body steel bar protection layer is mainly controlled by pore-forming and steel bar cage installation in the construction process, and no method can detect the thickness.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a device that can be complete, accurately detect pile body steel bar protective layer thickness is provided.
In order to solve the technical problem, the utility model provides a detect device of pile body steel reinforcement protective layer thickness, it includes jib support, jib, sensor array, depth gauge, data acquisition instrument, data processing computer and image display, jib support erects the top at the pile top, the jib is vertical setting, the jib can be connected with reciprocating on the jib support and its lower extreme is relative with the ascending drilling of pile body axial direction, the depth gauge sets up on the jib support and can detect the degree of depth that the jib stretches into in the drilling, the sensor array install the lower extreme of jib, the sensor array is equipped with the ultrasonic sensor who is used for detecting the distance between pile body outer wall and the sensor array and the electromagnetic sensor who is used for detecting the distance between steel reinforcement cage and the sensor array, ultrasonic sensor, data acquisition instrument, data processing computer and image display, The electromagnetic sensor and the depth meter are respectively connected with a data input end of the data acquisition instrument, a data output end of the data acquisition instrument is connected with a data input end of the data processing computer, and a data output end of the data processing computer is connected with a data input end of the image display.
As the preferred aspect of the present invention, the sensor array is provided with a macro lens for photographing a scanning portion of the sensor array.
As the utility model discloses preferred scheme, macro lens's next door is equipped with the LED light filling lamp.
As the utility model discloses preferred scheme, the sensor array is equipped with the balancing weight, the balancing weight is located ultrasonic sensor electromagnetic sensor with the below of macro lens.
As the preferred proposal of the utility model, the suspender is formed by connecting a plurality of connecting rods in sequence.
As the utility model discloses preferred scheme, adjacent two be threaded connection between the connecting rod.
Implement the utility model discloses a detect device of pile body steel bar protection layer thickness compares with prior art, has following beneficial effect:
the utility model discloses utilize ultrasonic sensor to carry out ultrasonic detection to the pile body, confirm the distance d between pile body outer wall and the sensor array1The electromagnetic sensor is used for carrying out magnetic induction detection on the reinforcement cage to determine the distance d between the reinforcement cage and the sensor array2And then d is represented by the formula1-d2And the thickness d of the protective layer of the reinforcing steel bar at different positions of the pile body is calculated by combining with the data of the depth gauge, so that the thickness of the protective layer of the reinforcing steel bar of the whole pile body is quickly and completely detected, the operation is simple and convenient, the quality of the pile body can be synchronously detected by ultrasonic scanning and electromagnetic induction scanning, the detection result is accurate and high in reliability, the method is particularly suitable for the cast-in-place pile with the rough outer wall of the pile body, relevant quality problems can be found in time, and the pile forming quality is ensured to play a certain promoting role.
Drawings
In order to more clearly illustrate the technical solution of the embodiments of the present invention, the drawings of the embodiments will be briefly described below.
Fig. 1 is a schematic structural view of a device for detecting the thickness of a pile body steel bar protection layer provided by the present invention;
fig. 2 is a detection schematic diagram of the device for detecting the thickness of the pile body steel bar protection layer provided by the utility model;
fig. 3 is a schematic diagram of the structure of a sensor array.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Referring to fig. 1 to 3, the present invention provides a device for detecting the thickness of a pile body steel bar protection layer, which comprises a suspension rod support 4, a suspension rod 5, a sensor array 6, a depth meter 10, a data acquisition instrument 7, a data processing computer 8 and an image display 9, wherein the suspension rod support 4 is erected above a pile top, the suspension rod 5 is vertically arranged, the suspension rod 5 is connected to the suspension rod support 4 in a vertically movable manner, the lower end of the suspension rod 5 is opposite to a drill hole 2 in the axial direction of a pile body 1, the depth meter 10 is arranged on the suspension rod support 4 and can detect the depth of the suspension rod 5 extending into the drill hole 2, the sensor array 6 is arranged at the lower end of the suspension rod 5, the sensor array 6 is provided with an ultrasonic sensor 61 for detecting the distance between the outer wall of the pile body 1 and the sensor array 6 and an electromagnetic sensor 62 for detecting the distance between a steel bar cage 11 and the sensor array 6, the ultrasonic sensor 61, the electromagnetic sensor 62 and the depth meter 10 are respectively connected with a data input end of the data acquisition instrument 7, a data output end of the data acquisition instrument 7 is connected with a data input end of the data processing computer 8, and a data output end of the data processing computer 8 is connected with a data input end of the image display 9.
The device is used for detecting the thickness of the pile body steel bar protection layer, and the operation steps comprise the following steps:
step 1, drilling a hole 2 (or a loose core hole reserved by a loose core test) in the axial direction of a pile body 1, preliminarily judging the quality of the pile body 1 through analysis of a drilled core, and calibrating the ultrasonic wave speed and the electromagnetic wave speed in concrete;
step 2, excavating a pit 3 with the depth of 10-30 cm at the periphery of the pile top to expose the pile head, then filling clear water into the drill hole 2, erecting a suspender support 4, and installing a suspender 5 and a sensor array 6;
step 3, connecting the sensor array 6 and a depth meter 10 on the suspender support 4 to a data input end of a data acquisition instrument 7, connecting a data output end of the data acquisition instrument 7 with a data input end of a data processing computer 8, and connecting a data output end of the data processing computer 8 with a data input end of an image display 9;
step 4, the sensor array 6 is lowered to the position where the pile head is exposed, ultrasonic detection is carried out on the pile body 1 by utilizing the ultrasonic sensor 61 on the sensor array 6, and the distance d between the outer wall of the pile body 1 and the sensor array 6 is determined1The electromagnetic sensor 62 on the sensor array 6 is used for carrying out magnetic induction detection on the reinforcement cage 11, and the distance d between the reinforcement cage 11 and the sensor array 6 is determined2(ii) a According to the actual condition of the exposed part of the pile head, checking d1And d2；
Step 5, starting from the pile top, carrying out ultrasonic and electromagnetic induction scanning on the inner wall of the drill hole 2 from top to bottom, and recording the scanning position of the sensor array 6 in real time through the depth meter 10;
step 6, collected test data d1、d2Using the formula d ═ d1-d2Calculating the thickness d of the protective layer of the steel bar at different positions of the pile body 1 by combining the data of the depth gauge 10;
step 7, converting the angle of the sensor array 6 through the suspender 5, and detecting the thickness condition of the steel bar protection layer on the pile body 1 in the other direction from the pile bottom to the pile top;
and 8, repeating the step 5 to the step 7 to complete the detection of the thickness of the steel bar protection layer of the whole pile body 1.
It should be further noted that the step 1 further includes a step of performing inclination measurement on the drill hole 2, and when the thickness d of the protective layer of the steel bar at different positions of the pile body 1 is calculated, the thickness d of the protective layer of the steel bar is subjected to error compensation by combining inclination measurement data.
It can be seen that the utility model discloses utilize ultrasonic sensor 61 to carry out ultrasonic detection to pile body 1, confirm the distance d between 1 outer wall of pile body and sensor array 61And performing magnetic induction detection on the reinforcement cage 11 by using the electromagnetic sensor 62 to determine the distance d between the reinforcement cage 11 and the sensor array 62And then d is represented by the formula1-d2And combine depth gauge 10 data to calculate the protective layer thickness d of the reinforcing bar of pile shaft 1 different positions department, thus detect out whole pile shaft 1 reinforcing bar protective layer thickness fast, easy operation, convenience, and ultrasonic scanning, electromagnetic induction scanning can carry out synchronous detection to the quality of pile shaft 1, the testing result is accurate, the reliability is high, especially adapted pile shaft 1 outer wall rough bored concrete pile, to finding relevant quality problem in time, ensure that pile-forming quality plays certain promotion effect.
Illustratively, the sensor array 6 is provided with a macro lens 63, the macro lens 63 is used for shooting a scanning part of the sensor array 6, and the crack development and bearing stratum conditions of the pile body 1 are obtained by analyzing hole wall image data shot by the macro lens 63. Further, an LED light supplement lamp 64 is arranged beside the macro lens 63 to facilitate the macro lens to take clear pictures.
Illustratively, the sensor array 6 is provided with a weight 65, and the weight 65 is located below the ultrasonic sensor 61, the electromagnetic sensor 62 and the macro lens 63, so that the suspension rod is always kept in a vertical state.
Exemplarily, the suspender 5 is formed by connecting a plurality of connecting rods in sequence, and two adjacent connecting rods are in threaded connection, so that the assembly and disassembly are convenient.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the invention, therefore, the invention is not limited thereto.

Claims (6)

1. The device for detecting the thickness of the pile body steel bar protection layer is characterized by comprising a suspender support, a suspender, a sensor array, a depth meter, a data acquisition instrument, a data processing computer and an image display, wherein the suspender support is erected above a pile top, the suspender is vertically arranged, the suspender can be connected on the suspender support in a vertically movable manner, the lower end of the suspender is opposite to a drilled hole in the axial direction of the pile body, the depth meter is arranged on the suspender support and can detect the depth of the suspender extending into the drilled hole, the sensor array is arranged at the lower end of the suspender, the sensor array is provided with an ultrasonic sensor for detecting the distance between the outer wall of the pile body and the sensor array and an electromagnetic sensor for detecting the distance between a steel reinforcement cage and the sensor array, and the ultrasonic sensor, the electromagnetic sensor and the depth meter are respectively connected with the data input end of the data acquisition instrument, the data output end of the data acquisition instrument is connected with the data input end of the data processing computer, and the data output end of the data processing computer is connected with the data input end of the image display.
2. The apparatus for detecting the thickness of the pile body steel bar protection layer according to claim 1, wherein the sensor array is provided with a macro lens for photographing the scanning position of the sensor array.
3. The device for detecting the thickness of the pile body steel bar protection layer according to claim 1, wherein an LED light supplement lamp is arranged beside the macro lens.
4. The apparatus for detecting the thickness of a pile body steel bar protection layer according to claim 1, wherein the sensor array is provided with a weight block, and the weight block is located below the ultrasonic sensor, the electromagnetic sensor and the macro lens.
5. The apparatus for detecting the thickness of a pile body steel bar protection layer according to claim 1, wherein the suspension rod is formed by connecting a plurality of connecting rods in sequence.
6. The device for detecting the thickness of the pile body steel bar protection layer according to claim 5, wherein, the adjacent two connecting rods are in threaded connection.
CN201920095615.5U 2019-01-21 2019-01-21 Device for detecting thickness of pile body steel bar protection layer Active CN210288501U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201920095615.5U CN210288501U (en) 2019-01-21 2019-01-21 Device for detecting thickness of pile body steel bar protection layer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201920095615.5U CN210288501U (en) 2019-01-21 2019-01-21 Device for detecting thickness of pile body steel bar protection layer

Publications (1)

Publication Number Publication Date
CN210288501U true CN210288501U (en) 2020-04-10

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN201920095615.5U Active CN210288501U (en) 2019-01-21 2019-01-21 Device for detecting thickness of pile body steel bar protection layer

Country Status (1)

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CN (1) CN210288501U (en)

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