On-site nondestructive testing method and device for construction quality of prefabricated concrete column sleeve joint
阅读说明：本技术 一种预制混凝土柱子套筒节点施工质量现场无损检测方法及装置 (On-site nondestructive testing method and device for construction quality of prefabricated concrete column sleeve joint ) 是由 许国东 李刚 赵广志 龚辉 卢立群 于 2019-11-27 设计创作，主要内容包括：本发明涉及预制混凝土检测技术领域,特别是一种预制混凝土柱子套筒节点施工质量现场无损检测方法,包括以下步骤,步骤S101：设置X射线系统；步骤S102：X射线穿透套筒能量平衡；步骤S103：数据处理系统分析,数据处理系统根据平板探测器的感光材料获得的X射线穿透图像,根据X射线穿透图像的形状和黑度情定构件有无缺陷及缺陷的形状、大小和位置。采用上述方法后,本发明的有益效果是：(1)X射线直接转换,直接创建有数字格式的图像,利用成像探测器作为X射线检测器,成像环节少,工作效率高；(2)不会产生因为扫描而引起的图像模糊,具有较好的图像分辨率和对比度,成像质量高；(3)对发出的射线进行吸收保护,减少环境影响。(The invention relates to the technical field of precast concrete detection, in particular to a field nondestructive detection method for the construction quality of a precast concrete column sleeve joint, which comprises the following steps of S101: setting an X-ray system; step S102: the energy balance of the X-ray penetrating sleeve; step S103: and analyzing by a data processing system, wherein the data processing system determines whether the member has a shape, a size and a position of a defect and no defect according to the shape and the blackness of the X-ray penetration image according to the X-ray penetration image obtained by the photosensitive material of the flat panel detector. After the method is adopted, the invention has the beneficial effects that: (1) the X-ray direct conversion is realized, an image in a digital format is directly created, and an imaging detector is used as an X-ray detector, so that the imaging link is few, and the working efficiency is high; (2) the image blurring caused by scanning can not be generated, and the method has better image resolution and contrast and high imaging quality; (3) the emitted rays are absorbed and protected, and the environmental influence is reduced.)
1. A field nondestructive testing method for the construction quality of a sleeve joint of a precast concrete column comprises the following steps,
step S101: arranging an X-ray system, arranging an X-ray source at the corner of the prefabricated column, enabling X-rays emitted by the X-ray source to penetrate from one side of the corner of the prefabricated column, pass through a corner sleeve and then reach a flat panel detector on the other side of the corner, and arranging a scattered ray absorption plate on the flat panel detector;
step S102: the energy of the X-ray penetrating sleeve is balanced, and a compensation block is arranged on one side of a corner part penetrated by the X-ray, so that the thickness of the X-ray penetrating through the concrete is uniform and the same;
step S103: and analyzing by a data processing system, wherein the data processing system determines whether the member has a shape, a size and a position of a defect and no defect according to the shape and the blackness of the X-ray penetration image according to the X-ray penetration image obtained by the photosensitive material of the flat panel detector.
2. The on-site nondestructive testing method for the construction quality of the precast concrete column sleeve joint is characterized by comprising the following steps of: the shape of the compensation block in step S102 is a triangle.
3. The utility model provides a on-spot nondestructive test device of precast concrete post sleeve node construction quality which characterized in that: the method comprises the steps that an X-ray source is arranged at the corner of a prefabricated column, and a compensation block which enables the X-ray to penetrate through concrete and has uniform thickness is fixed at the corner of the prefabricated column; and a flat panel detector for receiving X-rays penetrating through the concrete is arranged on the other side of the corner of the prefabricated column and is connected with a data processing system.
4. The on-site nondestructive testing device for the construction quality of the precast concrete column sleeve joint as recited in claim 3, characterized in that: and a scattered ray absorption plate is arranged outside the flat panel detector.
Technical Field
The invention relates to the technical field of precast concrete detection, in particular to a field nondestructive detection method and device for construction quality of a precast concrete column sleeve joint.
Background
The assembly building planning is intensively released since 2015, an industrial building evaluation standard is released at the end of 2015, the 2016 is decided to comprehensively popularize the assembly buildings nationwide, and breakthrough progress is achieved; the building department of 11/14 th of 2015 provides a building industry modernization development outline, and the assembled building accounts for more than 20% of the newly-built building in 2020 to more than 50% of the newly-built building in 2025.
With the development of the assembly type building in China, no effective detection method for the sleeve grouting quality exists. Grouting quality is of great importance to connection performance, but grouting quality detection is very difficult due to the fact that grouting connection belongs to hidden engineering and connection structure is complex and is often affected by coupling of multiple factors such as reinforcing steel bars, concrete, sleeves, grouting materials, wall thickness and heat insulation layers. The solid inspection of the connection quality of the grouting joint is lack of an effective field inspection means at present, and the current universal method is a breakage method, and the sleeve is taken out for sectioning detection. In practice, however, some professionals, including some, have some doubt as to the integrity of the assembled structural connection.
In recent years, in order to detect the grouting fullness of the sleeve of the reinforced prefabricated part on site in the stages of installation construction and acceptance completion, an embedded steel wire drawing method, an embedded sensor method, a CT method, an impact echo method and the like are successively developed. However, the above methods have their limitations in terms of use conditions, detection accuracy, convenience, and the like.
Compared with other detection means (ultrasonic waves, geological radars and the like), the X-ray detection has the imaging display effect and higher precision. The X-ray method has portability, does not need to embed elements, and can detect the grouting quality of the whole range of the sleeve on the engineering site. At present, the method is effective for components with uniform concrete thickness below 200mm, such as a shear wall, but the method cannot detect components with more internal sleeves, such as precast concrete columns, with the concrete thickness exceeding 300 mm.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a method and a device for the on-site nondestructive detection of the construction quality of a sleeve node of a precast concrete column, which can conveniently and reliably identify the internal defects of the sleeve.
In order to solve the technical problem, the on-site nondestructive testing method for the construction quality of the sleeve joint of the precast concrete column comprises the following steps,
step S101: arranging an X-ray system, arranging an X-ray source at the corner of the prefabricated column, enabling X-rays emitted by the X-ray source to penetrate from one side of the corner of the prefabricated column, pass through a corner sleeve and then reach a flat panel detector on the other side of the corner, and arranging a scattered ray absorption plate on the flat panel detector;
step S102: the energy of the X-ray penetrating sleeve is balanced, and a compensation block is arranged on one side of a corner part penetrated by the X-ray, so that the thickness of the X-ray penetrating through the concrete is uniform and the same;
step S103: and analyzing by a data processing system, wherein the data processing system determines whether the member has a shape, a size and a position of a defect and no defect according to the shape and the blackness of the X-ray penetration image according to the X-ray penetration image obtained by the photosensitive material of the flat panel detector.
Preferably, the shape of the compensation block in step S102 is a triangle.
The invention also discloses a field nondestructive testing device for the construction quality of the sleeve joint of the precast concrete column, which comprises an X-ray source arranged at the corner of the precast column, wherein the corner of the precast column is fixed with a compensating block which ensures that the X-ray penetrates through the concrete and has uniform thickness; and a flat panel detector for receiving X-rays penetrating through the concrete is arranged on the other side of the corner of the prefabricated column and is connected with a data processing system.
Preferably, a scattered ray absorption plate is arranged outside the flat panel detector.
After the method and the structure are adopted, the beneficial effects of the invention are as follows:
(1) the X-ray direct conversion is realized, an image in a digital format is directly created, and an imaging detector is used as an X-ray detector, so that the imaging link is few, and the working efficiency is high;
(2) the image blurring caused by scanning can not be generated, and the method has better image resolution and contrast and high imaging quality;
(3) the emitted rays are absorbed and protected, and the environmental influence is reduced.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a schematic view of a precast concrete post corner sleeve.
FIG. 2 is a schematic diagram illustrating the nondestructive testing of the construction quality of the precast concrete pillar corner sleeve.
FIG. 3 is a graph showing the DR of precast concrete column corner sleeves using this method.
FIG. 4 is a graph of the result of a concrete pole corner sleeve DR not prefabricated by this method.
In the figure: 1 is a compensation block, 2 is a flat panel detector, 3 is a scattered ray absorption plate, 4 is an X-ray source, 5 is a prefabricated column, 6 is a sleeve, and 7 is a data processing system.
Detailed Description
As shown in fig. 1 and 2, the on-site nondestructive testing method for the construction quality of the precast concrete column sleeve joint comprises the following steps,
step S101: arranging an X-ray system, arranging an X-ray source 4 at the corner of a prefabricated column 5, leading X-rays emitted by the X-ray source 4 to penetrate from one side of the corner of the prefabricated column 5, pass through a
Step S102: the energy of the X-ray penetrating sleeve is balanced, and a compensation block is arranged on one side of a corner part penetrated by the X-ray, and the compensation block enables the thickness of the X-ray penetrating through the concrete to be uniform. As shown in fig. 2, a triangular compensation block 1 is added, and the material of the compensation block 1 is the same as that of concrete. By adding the compensation block 1, the energy attenuation of the X-rays scattered out from each angle of the X-ray source is the same after the X-rays pass through the compensation block and the concrete, so that the detection result is influenced due to different thicknesses of the concrete at the corners of the prefabricated column 5. Aiming at the condition that the intensity of the energy collected by the ray plate is changed greatly due to the uneven thickness of the concrete outside the sleeve, and the detection result is not clear; the energy passing through the grout sleeve in the concrete column is balanced using the compensating block 1 and the scattered radiation absorbing plate 3. And obtaining a clear X-ray picture in the grouting sleeve, and analyzing the grouting quality and the steel bar anchoring length in the sleeve.
Step S103: the data processing system analyzes that the
As shown in FIG. 2, the invention also discloses a field nondestructive testing device for the construction quality of the sleeve joint of the precast concrete column, which comprises an X-ray source 4 arranged at the corner of a precast column 5, wherein a compensating block 1 which ensures that the X-ray penetrates through the concrete with uniform thickness is fixed at the corner of the precast column 5; the other side of the corner of the prefabricated column 5 is provided with a
The working principle of the patent application is as follows: during the process of X-ray penetrating the detected member (such as sleeve, bellows in shear wall, etc.), the intensity of the X-ray is weakened by the absorption and diffusion of the penetrated substance, and the weakening degree depends on the ability of the penetrating substance to absorb and diffuse the X-ray (related to the density of the substance) and the thickness of the penetrating substance. If the irradiated corrugated pipe grouting material has defects (cavities, gaps, incompact and the like) locally, the radiation attenuation capacity of the defects to the radiation is far smaller than that of the grouting material, and the intensity of the transmitted radiation of the local area is far larger than that of the surrounding area.
The photosensitive material is placed behind the measured position of the member to be sensitized under the action of transmitted X-rays, the corresponding position on the photosensitive material has different blackness due to different ray penetration strengths of the defective position and the intact position, and the shape, the size and the position of the defect and the defect in the member can be evaluated according to the shape and the blackness of the difference image.
The invention aims at the construction quality of the sleeve joint in the precast concrete column, and the thickness of the concrete protection layer of the sleeve in the column is not uniform because the column is a multi-position square column. The method is composed of compensation block, absorption plate, X-ray machine, scattered ray receiving plate and related data processing program. Aiming at the condition that the intensity of the energy collected by the ray plate is changed greatly due to the uneven thickness of the concrete outside the sleeve, and the detection result is not clear; the energy of the grouting sleeve penetrating the concrete column is balanced by the compensating block and the absorbing plate. And obtaining a clear X-ray picture in the grouting sleeve, and analyzing the grouting quality and the steel bar anchoring length in the sleeve.
By comparison, as shown in fig. 3 and 4, it can be seen that the images obtained using the compensation block 1 are clearer and the shape, size and position of the various components within the sleeve can be more easily determined.
Although specific embodiments of the present invention have been described above, it will be appreciated by those skilled in the art that these are merely examples and that many variations or modifications may be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims.
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