阅读说明：本技术 一种压电智能骨料传感器及其制作方法 (Piezoelectric intelligent aggregate sensor and manufacturing method thereof ) 是由 侯爽 赵晨 于 2019-12-30 设计创作，主要内容包括：本发明公开了一种压电智能骨料传感器及其制作方法,所述压电智能骨料传感器包括嵌入块体；所述嵌入块体包括混凝土块、定位钢筋和若干个智能骨料,所述若干个智能骨料间距的固定于混凝土块内；所述定位钢筋贯穿混凝土块向外延伸,用于与结构钢筋进行固定,所述每个智能骨料至少有一个表面暴露在空气中。所述制作方法,包括以下步骤：S1、制作混凝土块模板,所述混凝土块模板包括底模板、带孔侧模板、不带孔的侧模板和定位钢筋；S2、制作嵌入块体；S3、对步骤S2得到嵌入块体表面进行粗糙化处理。本发明优点在于便捷、可靠、准确的传感器结构嵌入。(The invention discloses a piezoelectric intelligent aggregate sensor and a manufacturing method thereof, wherein the piezoelectric intelligent aggregate sensor comprises an embedded block body; the embedded block body comprises a concrete block, a positioning steel bar and a plurality of intelligent aggregates, and the intelligent aggregates are fixed in the concrete block at intervals; the positioning steel bars penetrate through the concrete block and extend outwards for being fixed with the structural steel bars, and at least one surface of each intelligent aggregate is exposed in the air. The manufacturing method comprises the following steps: s1, manufacturing a concrete block template, wherein the concrete block template comprises a bottom template, a side template with holes, a side template without holes and positioning steel bars; s2, manufacturing an embedded block; s3, roughening the surface of the embedded block obtained in the step S2. The invention has the advantages of convenient, reliable and accurate sensor structure embedding.)

1. The piezoelectric intelligent aggregate sensor is characterized by comprising an embedded block body (6); the embedded block body (6) comprises a concrete block (7), a positioning steel bar (8) and a plurality of intelligent aggregates (9), wherein the intelligent aggregates (9) are fixed in the concrete block (7) at intervals; the positioning steel bars (8) penetrate through the concrete block (7) and extend outwards for being fixed with the structural steel bars, and at least one surface of each intelligent aggregate (9) is exposed in the air.

2. A piezoelectric intelligent aggregate sensor according to claim 1, wherein the spacing between the intelligent aggregates (9) is not less than 25 mm.

3. The piezoelectric intelligent aggregate sensor according to claim 1, wherein the embedded block (6) is used for welding the positioning steel bars (8) on the structural steel bars of the component to be detected of the sensor for fixing when being arranged on the component to be detected.

4. The manufacturing method of the piezoelectric intelligent aggregate sensor, which is used for the method as claimed in claim 1, is characterized by comprising the following steps:

s1, manufacturing a concrete block template (1), wherein the concrete block template (1) comprises a bottom template (2), a side template with holes (3), a side template without holes (5) and positioning steel bars (8);

s2, manufacturing an embedded block (6);

s3, roughening the surface of the embedded block (6) obtained in the step S2.

5. The method of manufacturing according to claim 4, wherein the form is a square wooden form; the bottom template (2) is flat in surface.

6. A method according to claim 4, characterised in that the sideform (3) is provided with at least two or more reinforcement-bar locating holes (4), the two or more reinforcement-bar locating holes (4) being positioned in a straight line.

7. The manufacturing method according to claim 4, wherein the manufacturing process of step S2 is as follows:

s21, fixing intelligent aggregates (9) on the surface of the bottom template (2) at intervals through epoxy resin bonding;

s22, nailing the perforated side template (3) and the non-perforated side template (5) on the bottom template (2) to form a square frame with an open top; then the positioning steel bar (8) passes through the steel bar positioning hole (4) on the side template (3) with the hole;

and S23, pouring, vibrating and curing concrete in the square frame, obtaining a concrete block (7) after the concrete is finally set, and removing each template of the template to obtain the embedded block (6).

8. The method according to claim 7, wherein in step S23, the reinforcement positioning holes (4) are sealed with glass cement to prevent slurry leakage during concrete casting.

9. The method according to claim 7, wherein the concrete used in step S23 is the same as the concrete used for the member to be tested.

10. The manufacturing method according to claim 4, wherein the roughening treatment in step S3 is to wash away epoxy resin on the surface of the smart aggregate (9) with a high-pressure water gun, and to roughen the surface of the concrete block (7) with a roughening machine and a high-pressure water gun, so that the embedded block (6) and the monitored structure concrete are well combined and have the same shrinkage and creep.

Technical Field

The invention belongs to the technical field of nondestructive testing of concrete materials, and relates to a piezoelectric intelligent aggregate sensor and a manufacturing method thereof.

Background

In the current nondestructive testing field, the ultrasonic testing technology is the method with the highest use frequency, and the technology for testing the steel structure by using the ultrasonic testing is mature. There are many problems with the technology of using ultrasonic testing for the inspection of concrete structures. The reasons for this are various, and one of the main reasons is that the embedding method of the intelligent aggregate is not ideal, so that the position of the intelligent aggregate embedded into the member to be measured has a certain deviation and the deviation is random. This results in some errors in the signals sent and received by the intelligent aggregate compared to the theoretical signals, and these errors are difficult to correct by means of data post-processing.

The existing traditional method I comprises the following steps: the piezoelectric intelligent aggregate is placed on a reinforcement cage, the piezoelectric intelligent aggregate is placed on a stirrup or a longitudinal bar of the reinforcement cage, and the reinforcement cage is adhered with 502 glue or AB glue (Zhang Hai Bin. piezoelectric aggregate stress monitoring and model correction of earthquake damage of a reinforced concrete structure [ D ]. university of continental engineering, 2016 ]). The existing traditional method II comprises the following steps: the piezoelectric intelligent aggregate is placed on a stirrup or a longitudinal bar of the reinforcement cage and is bound and fixed on the reinforcement cage through a nylon rope, a binding belt and the like. (dynamic response research of highlighter, high-strength reinforced concrete slab under explosive load [ D ]. Wuhan science and technology university, 2019.)

There are three disadvantages to these two general embedding methods: first, positioning sensors may be embedded with positioning materials such as nylon ropes in the embedded members of the sensors, which may cause the sensor signals to be interfered by additional factors. Secondly, the sensor position is easily moved during the concrete pouring and vibrating process. Third, when there are multiple sensors, it is difficult to determine the relative positions of the various sensors.

Disclosure of Invention

The invention aims to provide an intelligent aggregate embedding method which can more accurately position intelligent aggregates and can correct errors caused by position deviation in a data post-processing mode after the position of the intelligent aggregates deviates. Can be widely applied to various intelligent aggregates.

The invention is realized by at least one of the following technical schemes.

A piezoelectric intelligent aggregate sensor comprises an embedded block body; the embedded block body comprises a concrete block, a positioning steel bar and a plurality of intelligent aggregates, and the intelligent aggregates are fixed in the concrete block at intervals; the positioning steel bars penetrate through the concrete block and extend outwards for being fixed with the structural steel bars, and at least one surface of each intelligent aggregate is exposed in the air.

Further, the distance between the intelligent aggregates is not less than 25 mm.

Further, the embedded block is used for welding the positioning steel bars on the structural steel bars of the component to be detected of the sensor to be fixed when being arranged on the component to be detected.

The manufacturing method for the piezoelectric intelligent aggregate sensor comprises the following steps:

s1, manufacturing a concrete block template, wherein the concrete block template comprises a bottom template, a side template with holes, a side template without holes and positioning steel bars;

s2, manufacturing an embedded block;

s3, roughening the surface of the embedded block obtained in the step S2.

Further, the template is a square wood template; the bottom template has a smooth surface.

Furthermore, at least more than two steel bar positioning holes are required to be arranged on the side template with the holes, and the positions of the more than two steel bar positioning holes are required to be on the same straight line.

Further, the manufacturing process of step S2 is as follows:

s21, fixing intelligent aggregates on the surface of the bottom template through epoxy resin bonding at intervals;

s22, nailing the perforated side template and the non-perforated side template on the bottom template to form a square frame with an open top; then the positioning steel bar passes through the steel bar positioning hole on the side template with the hole;

and S23, pouring, vibrating and maintaining concrete in the square frame, obtaining concrete blocks after the concrete is finally set, and removing each template of the template to obtain the embedded block.

Further, in step S23, the reinforcement positioning holes are sealed with glass cement to avoid slurry leakage during concrete casting.

Further, the concrete used in step S23 is the same as the concrete used for the member to be measured.

Further, the roughening treatment in step S3 is specifically to wash away the epoxy resin on the surface of the intelligent aggregate with a high-pressure water gun, and to chisel the surface of the concrete block with a chiseling machine and a high-pressure water gun, so that the embedded block and the concrete of the monitored structure are well combined and have the same shrinkage and creep.

The embedding method of the piezoelectric intelligent aggregate sensor comprises the following steps:

1) when the embedded block is used for passive detection in a concrete structure, the surface of the concrete block embedded in the block is roughened by a roughening machine, the embedded block is placed at the specified position of a member to be detected, and then the positioning steel bars on the embedded block and the steel bars on the steel bar cage of the member to be detected are welded together, namely the stirrups.

2) When the embedded blocks are used for active detection in a concrete structure, all the blocks need to be aligned strictly, and a component to be detected is at least embedded into more than two embedded blocks, wherein one embedded block is used for exciting and sending out a signal, and the other embedded blocks are used as receiving ends for receiving the signal. Specifically, fix the set bar on the steel reinforcement cage of the component that awaits measuring with thin iron wire earlier, then do the adjustment of thin portion and make and align between the embedding block, at last release thin iron wire one by one and weld the set bar on the position after the fine setting. And finally, welding the positioning steel bars embedded into the block body and the structural steel bars to be detected together.

The intelligent aggregate positioning method is characterized in that the embedded block is positioned on the embedded block template and then the embedded block is positioned in the component to be measured, and the method is different from the traditional method that the intelligent aggregate is directly positioned in the component to be measured, so that the operation space is increased, and the construction is more convenient.

The intelligent aggregate can be positioned through the surface of the template, and can be directly placed at the included angle of the template, so that the alignment degree of the intelligent aggregate depends on the flatness of the surface of the template, and the method is different from the traditional method which needs positioning methods such as manual ruler measuring distance and the like, and the error is reduced.

The manufacturing method can fix the intelligent aggregate without introducing other materials such as binding ropes. This will not cause additional errors.

The invention positions a plurality of intelligent aggregates embedded in the block body through the positioning steel bars. If the position of the embedded block is deflected due to some unpredictable reason, all the intelligent aggregates embedded in the block are deflected by the same angle, so that the error can be easily corrected by the data post-processing stage.

The invention positions a plurality of intelligent aggregates embedded in the block body through the positioning steel bars. The position of the intelligent aggregate can deviate because a great force acts on the intelligent aggregate when the vibrated concrete is poured. Therefore, in order to prevent the position of the intelligent aggregate from shifting, the intelligent aggregate is embedded in a reliable manner, and the intelligent aggregate to be embedded has a certain constraint effect. However, the traditional method of binding with ropes or gluing is obviously insufficient for restraining the intelligent aggregate. The manufacturing method of the invention is to position a plurality of intelligent aggregates embedded in the block body through the positioning steel bars. The intelligent aggregate is wrapped and restrained by concrete, and the positioning steel bars are welded on the steel reinforcement cage of the component to be measured, so that the position of the intelligent aggregate can be restrained well and prevented from deviating.

Compared with the prior art, the invention has the following advantages:

1. when the intelligent aggregate is positioned, positioning materials such as nylon ropes and the like do not need to be embedded in the member to be detected, so that the receiving and sending of the intelligent aggregate signals are not interfered by additional factors.

2. The influence of the member to be measured on the position of the intelligent aggregate in the concrete pouring and vibrating processes is reduced or even eliminated.

3. If the positioning steel bars incline due to individual reasons in the process of positioning the intelligent aggregates, all the intelligent aggregates in the embedded block connected with the positioning steel bars incline towards the same direction, so that simple correction can be performed through a data post-processing method.

4. The intelligent aggregate installation process is convenient and simple.

5. The method is widely suitable for positioning various intelligent aggregates, and is a simple but effective intelligent aggregate embedding method.

Drawings

FIG. 1 is a schematic view of the concrete block form of the present embodiment;

FIG. 2 is a schematic diagram illustrating the arrangement of intelligent aggregates embedded in a block according to the present embodiment;

fig. 3 is a schematic diagram of a piezoelectric intelligent aggregate sensor according to the embodiment.

Detailed Description

In order to make the invention more comprehensible, the following description is given in conjunction with the accompanying drawings and the detailed description.

The technical content, features and effects of the invention will be clearly shown in the following detailed description of the preferred embodiments with reference to the drawings. While the invention has been described in connection with specific embodiments thereof, reference is made to the accompanying drawings which form a part hereof, and in which is shown by way of illustration, and not by way of limitation, the invention.

As shown in fig. 3, a piezoelectric intelligent aggregate sensor comprises an embedded block 6; the embedded block 6 comprises a concrete block 7, a positioning steel bar 8 and a plurality of intelligent aggregates 9, and the intelligent aggregates 9 are fixed in the concrete block 7 at intervals; the positioning steel bars 8 penetrate through the concrete block 7 and extend outwards from two sides of the concrete block for being welded and fixed with the structural steel bars, and at least one surface of each intelligent aggregate 9 is exposed in the air.

The distance between the intelligent aggregates 9 is not less than 25 mm.

The embedded block 6 fixes the positioning steel bar 8 welded on the structural steel bar of the component to be measured of the sensor when being arranged on the component to be measured.

The manufacturing method for the piezoelectric intelligent aggregate sensor comprises the following steps:

s1, manufacturing a concrete block template 1, wherein the concrete block template 1 comprises a bottom template 2, a side template 3 with holes, a side template 5 without holes and positioning steel bars 8 as shown in figure 1;

the template is a square wood template; the bottom template 2 has a flat surface.

The side template 3 with the holes is provided with at least more than two steel bar positioning holes 4, and the positions of the more than two steel bar positioning holes 4 are in a straight line.

S2, manufacturing an embedded block 6; the preparation process comprises the following steps:

s21, fixing the intelligent aggregates 9 on the surface of the bottom template 2 at intervals through epoxy resin bonding, and sticking a plurality of intelligent aggregates 9 on two opposite side surfaces of the bottom template 2 as shown in figure 2;

s22, nailing the perforated side template 3 and the non-perforated side template 5 on the bottom template 2 to form a square frame with an open top; then the two positioning steel bars 8 respectively pass through different steel bar positioning holes 4 on the side template 3 with the holes;

and S23, pouring, vibrating and curing concrete in the square blocks, obtaining concrete blocks 7 after the concrete is finally set, and removing the templates of the templates to obtain the embedded block 6 shown in the figure 3. When concrete is poured, the reinforcing steel bar positioning hole 4 needs to be sealed by glass cement to avoid slurry leakage.

The concrete used in step S23 is the same as the concrete used for the member to be tested.

S3, roughening the surface of the embedded block 6 obtained in step S2.

The concrete is that the epoxy resin on the surface of the intelligent aggregate 9 is removed by flushing with a high-pressure water gun, and the surface of the concrete block 7 is subjected to scabbling treatment by using a scabbling machine and the high-pressure water gun, so that the embedded block 6 is well combined with the concrete of the monitored structure, and has the same shrinkage and creep.

The embedding method of the piezoelectric intelligent aggregate sensor comprises the following steps:

1) when the embedded block is used for passive detection in a concrete structure, the surface of the concrete block embedded in the block is roughened by a roughening machine, the embedded block is placed at the specified position of a member to be detected, and then the positioning steel bars on the embedded block and the steel bars on the steel bar cage of the member to be detected are welded together, namely the stirrups.

2) When the embedded blocks are used for active detection in a concrete structure, all the blocks need to be aligned strictly, and a component to be detected is at least embedded into more than two embedded blocks, wherein one embedded block is used for exciting and sending out a signal, and the other embedded blocks are used as receiving ends for receiving the signal. Specifically, fix the set bar on the steel reinforcement cage of the component that awaits measuring with thin iron wire earlier, then do the adjustment of thin portion and make and align between the embedding block, at last release thin iron wire one by one and weld the set bar on the position after the fine setting. And finally, welding the positioning steel bars embedded into the block body and the structural steel bars to be detected together.

The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and enhancements can be made without departing from the principles of the invention, and such modifications and enhancements are intended to be within the scope of the invention.