A method for installing a sensor for monitoring concrete surface quality

Abstract

The present invention discloses a method for installing a sensor for monitoring the surface quality of a concrete structure, comprising the following steps: Step 1, using expansion bolts to install two steel plates on the surface of the concrete; Step 2, forming a pre-fixed component by forming a sensor simulation rod and two sensor bases; Step 3, welding the two sensor bases to the surfaces of the two steel plates; Step 4, after the welds have cooled, removing the sensor simulation rod from the two sensor bases, assembling a fiber grating sensor on the two sensor bases, so that the fiber grating sensor, the two sensor bases, and the two steel plates form a sensor pre-assembled component; Step 5, customizing a sensor protective shell according to the size of the sensor pre-assembled component, and then fixing the sensor protective shell to the surface of the concrete with four expansion bolts; and finally filling the sensor protective shell with a thermal insulation and waterproof material through the outlet hole of the sensor protective shell. The present invention can ensure the stability and corrosion resistance of the sensor.

Description

Technical Field

[0001] The invention relates to a method for installing a sensor for monitoring the surface quality of a concrete structure. Background Art

[0002] Due to loads and harsh environments, concrete structures inevitably deform, become defective, and even collapse. To reduce the high costs associated with cumulative damage and prevent eventual structural failure, timely and repeatable monitoring of concrete structure deformation and initial defects is crucial. Given the adverse effects of structural degradation on the service life of concrete structures, structural health monitoring has become an important approach to ensuring the safety and durability of concrete structures. However, in-situ stress monitoring of concrete structures still faces significant challenges, as the monitoring system itself is susceptible to environmental and human factors.

[0003] When implementing concrete surface monitoring projects, the sensor is the core component, and the quality of its installation directly affects the accuracy of monitoring. Because the fiber grating sensors used for concrete surface monitoring need to be fixed to the concrete surface, finding a more stable sensor installation method is particularly important to improve the accuracy of concrete surface monitoring and expand the application of concrete surface monitoring to more diverse environments. Summary of the Invention

[0004] The purpose of the present invention is to overcome the defects of the prior art and provide a method for installing a sensor for monitoring the surface quality of a concrete structure, which can ensure the stability and corrosion resistance of the sensor and make the monitoring results of the sensor more accurate.

[0005] The object of the present invention is achieved as follows: A method for installing a sensor for monitoring the surface quality of a concrete structure comprises the following steps:

[0006] Step 1: Prepare two rectangular steel plates, with a mounting hole drilled at each of the four corners. First, clean the concrete surface where the sensor is to be installed by grinding it. Then, determine the installation positions of the two steel plates based on the sensor's installation position and size, and mark the concrete surface. Then, drill corresponding holes in the concrete surface according to the locations of the mounting holes on the steel plates. Finally, use expansion bolts to mount the two steel plates on the concrete surface.

[0007] Step 2: Prepare a sensor simulation rod with the same size as the fiber Bragg grating sensor to be installed; install the two ends of the sensor simulation rod on a sensor base respectively, ensuring that the two end surfaces of the sensor simulation rod are flush with the outer end surfaces of the sensor base, and ensuring that the bottom surfaces of the two sensor bases are on the same plane, so that the sensor simulation rod and the two sensor bases form a pre-fixed component;

[0008] Step 3: Place the two sensor bases of the pre-fixed component in the center of the surface of the two steel plates in a one-to-one correspondence, and align and press the two sensor bases with the two steel plates in a one-to-one correspondence, and then weld the two sensor bases to the surface of the two steel plates in a one-to-one correspondence;

[0009] Step 4: After the weld has cooled, remove the sensor simulation rod from the two sensor bases, and assemble the fiber Bragg grating sensor on the two sensor bases, so that the fiber Bragg grating sensor, the two sensor bases, and the two steel plates form a sensor pre-assembly component;

[0010] Step five: customize the sensor protective shell according to the size of the sensor pre-assembled component. The sensor protective shell includes a semicircular cover plate, two semicircular end plates connected one-to-one to the two ends of the semicircular cover plate, and two flanges bent horizontally from the two ends of the semicircular plate; the length of the cover plate is greater than the distance between the outer ends of the two steel plates; a wire outlet hole is opened at the center bottom of one of the end plates; a bolt hole is opened at each end of the two flanges; first, cover the sensor protective shell on the sensor pre-assembled component, and place the end plate with the wire outlet hole opposite to the signal line lead-out end of the fiber optic Bragg grating sensor, and lead the signal line of the fiber optic Bragg grating sensor out of the wire outlet hole; then, drill holes on the surface of the concrete according to the corresponding positions of the bolt holes on the sensor protective shell, and then use four expansion bolts to fix the sensor protective shell on the surface of the concrete; finally, fill the sensor protective shell with thermal insulation and waterproof material from the wire outlet hole.

[0011] In the above-mentioned method for installing a sensor for monitoring the surface quality of a concrete structure, when performing step three, the welds between the sensor base and the surface of the steel plate are limited to the bottom portions on both sides of the sensor base.

[0012] In the above-mentioned method for installing a sensor for monitoring the surface quality of a concrete structure, when performing step five, the four bolt holes on the sensor protective shell are lateral waist-shaped holes.

[0013] The installation method of the sensor for monitoring the surface quality of concrete structures of the present invention has the following characteristics:

[0014] 1) First, use the sensor simulation rod to install it on the sensor base to form a pre-fixed component, and then weld the pre-fixed component to the two steel plates. Avoid directly using the sensor for welding, otherwise the sensor will be damaged during the welding process, ensuring the installation stability of the fiber Bragg grating sensor;

[0015] 2) A sensor protective shell is used to fully cover the fiber Bragg grating sensor, and the sensor protective shell is filled with thermal insulation and waterproof materials to keep the fiber Bragg grating sensor and the surface temperature of the monitored concrete close while providing waterproof protection for the fiber Bragg grating sensor. This not only makes the monitoring results more accurate, but also makes the fiber Bragg grating sensor corrosion-resistant. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a perspective view after performing step 2 of the method for installing a sensor for monitoring the surface quality of a concrete structure according to the present invention;

[0017] Figure 2 It is a perspective view after performing step five of the method for installing a sensor for monitoring the surface quality of a concrete structure according to the present invention. DETAILED DESCRIPTION

[0018] The present invention will be further described below with reference to the accompanying drawings.

[0019] See also Figure 1 and Figure 2 The method for installing a sensor for monitoring the surface quality of a concrete structure of the present invention comprises the following steps:

[0020] Step 1: Prepare two rectangular steel plates 2, each with a mounting hole at its four corners. First, polish and clean the concrete surface 1 where the sensor is to be installed. Then, determine the installation positions of the two steel plates 2 based on the sensor's installation position and size, and mark the concrete surface. Then, drill corresponding holes in the concrete surface 1 according to the positions of the mounting holes on the steel plates 2. Finally, use expansion bolts 6 to mount the two steel plates 2 on the concrete surface 1.

[0021] Step 2: Prepare a sensor simulation rod 4, the size of which is the same as that of the fiber Bragg grating sensor 4' to be installed; install the two ends of the sensor simulation rod 4 on a sensor base 3 respectively, and provide an open ring on the top surface of the sensor base 3. After the sensor simulation rod 4 is passed through the open ring, use the set screw 30 on the open ring to fasten the sensor simulation rod 4 to the sensor base 3, ensuring that the two end faces of the sensor simulation rod 4 are flush with the outer end faces of the sensor base 3, and ensuring that the bottom surfaces of the two sensor bases 3 are on the same plane, so that the sensor simulation rod 4 and the two sensor bases 3 constitute a pre-fixed component;

[0022] Step 3: Place the two sensor bases 3 of the pre-fixed component in the center of the surface of the two steel plates 2 in a one-to-one correspondence, and align and press the two sensor bases 3 with the two steel plates 2 in a one-to-one correspondence. Then, weld the two sensor bases 3 to the surface of the two steel plates 2 in a one-to-one correspondence. During welding, the weld 20 between each sensor base 3 and the steel plate 2 is limited to the bottom of both sides of the sensor base 3, and welding is not allowed on other parts.

[0023] Step 4: After the weld is cooled, remove the sensor simulation rod 4 from the two sensor bases 3, and assemble the fiber Bragg grating sensor 4' on the two sensor bases 3, so that the fiber Bragg grating sensor 4', the two sensor bases 3 and the two steel plates 2 form a sensor pre-assembled component;

[0024] Step 5: Customize the sensor protective shell 5 according to the size of the sensor pre-assembled component. The sensor protective shell 5 includes a semicircular cover plate 51, two semicircular end plates 52 connected to the two ends of the semicircular cover plate 51 in a one-to-one correspondence, and two flanges 53 horizontally bent from the two ends of the semicircular cover plate 51 in a one-to-one correspondence; the length of the cover plate 51 is greater than the distance between the outer ends of the two steel plates 2; a wire outlet hole 50 is opened at the center bottom of one of the end plates 52; a lateral waist-shaped bolt hole is opened at each end of the two flanges 53, so that the lateral position of the sensor protective shell 5 can be fine-tuned; first cover the sensor protective shell 5 on the sensor pre-assembled component, and place the end plate 52 with the wire outlet hole 50 facing the optical fiber. The signal line of the grating sensor 4' is led out from the outlet hole 50; holes are drilled on the concrete surface 1 according to the corresponding positions of the bolt holes on the sensor protective shell 5, and then the sensor protective shell 5 is fixed to the concrete surface 1 with four expansion bolts 6 to achieve full coverage of the FBG sensor 4'; finally, the sensor protective shell 5 is filled with thermal insulation and waterproof material from the outlet hole 50. The thermal insulation and waterproof material can be made of polyurethane foam glue, which keeps the surface temperature of the FBG sensor 4' close to that of the monitored concrete while providing waterproof protection for the FBG sensor 4', making the monitoring results more accurate.

[0025] The above embodiments are only used to illustrate the present invention, rather than to limit the present invention. Those skilled in the art may make various changes or modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions should also fall within the scope of the present invention and should be defined by the claims.

Claims

1. A method for installing a sensor for monitoring the surface quality of a concrete structure, characterized in that: The installation method comprises the following steps: Step 1: Prepare two rectangular steel plates, with a mounting hole drilled at each of the four corners. First, clean the concrete surface where the sensor is to be installed by grinding it. Then, determine the installation positions of the two steel plates based on the sensor's installation position and size, and mark the concrete surface. Then, drill corresponding holes in the concrete surface according to the locations of the mounting holes on the steel plates. Finally, use expansion bolts to mount the two steel plates on the concrete surface. Step 2: Prepare a sensor simulation rod with the same size as the fiber Bragg grating sensor to be installed; install the two ends of the sensor simulation rod on a sensor base respectively, ensuring that the two end surfaces of the sensor simulation rod are flush with the outer end surfaces of the sensor base, and ensuring that the bottom surfaces of the two sensor bases are on the same plane, so that the sensor simulation rod and the two sensor bases form a pre-fixed component; Step 3: Place the two sensor bases of the pre-fixed component in the center of the surface of the two steel plates in a one-to-one correspondence, and align and press the two sensor bases with the two steel plates in a one-to-one correspondence, and then weld the two sensor bases to the surface of the two steel plates in a one-to-one correspondence; Step 4: After the weld has cooled, remove the sensor simulation rod from the two sensor bases, and assemble the fiber Bragg grating sensor on the two sensor bases, so that the fiber Bragg grating sensor, the two sensor bases, and the two steel plates form a sensor pre-assembly component; Step five: customize the sensor protective shell according to the size of the sensor pre-assembled component. The sensor protective shell includes a semicircular cover plate, two semicircular end plates connected one-to-one to the two ends of the semicircular cover plate, and two flanges bent horizontally from the two ends of the semicircular plate; the length of the cover plate is greater than the distance between the outer ends of the two steel plates; a wire outlet hole is opened at the center bottom of one of the end plates; a bolt hole is opened at each end of the two flanges; first, cover the sensor protective shell on the sensor pre-assembled component, and place the end plate with the wire outlet hole opposite to the signal line lead-out end of the fiber optic Bragg grating sensor, and lead the signal line of the fiber optic Bragg grating sensor out of the wire outlet hole; then, drill holes on the surface of the concrete according to the corresponding positions of the bolt holes on the sensor protective shell, and then use four expansion bolts to fix the sensor protective shell on the surface of the concrete; finally, fill the sensor protective shell with thermal insulation and waterproof material from the wire outlet hole.

2. The method for installing a sensor for monitoring the surface quality of a concrete structure according to claim 1, characterized in that: When performing step three, the weld between the sensor base and the surface of the steel plate is limited to the bottom of both sides of the sensor base.

3. The method for installing a sensor for monitoring the surface quality of a concrete structure according to claim 1, characterized in that: When performing step five, the four bolt holes on the sensor protective shell are lateral waist-shaped holes.

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