Installation method of sensor for monitoring concrete surface quality

Abstract

The invention discloses an installation method of a sensor for monitoring the surface quality of a concrete structure. The installation method comprises the following steps that 1, two steel plates are installed on the surface of concrete through expansion bolts; step 2, forming a pre-fixing component by a sensor simulation rod and two sensor bases; step 3, welding the two sensor bottoms on the surfaces of the two steel plates respectively; 4, after the welding seam is cooled, the sensor simulation rod is detached from the two sensor bases, the fiber grating sensor is assembled on the two sensor bases, and the fiber grating sensor, the two sensor bases and the two steel plates form a sensor pre-assembly component; 5, customizing a sensor protection shell according to the size of the sensor pre-assembled component, and fixing the sensor protection shell on the surface of the concrete by using four expansion bolts; and finally, the sensor protection shell is filled with a heat preservation waterproof material from the wire outlet hole of the sensor protection shell. Stability and corrosion resistance of the sensor can be guaranteed.

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 the effects of loads and harsh environments, concrete structures will inevitably deform, become defective, and even collapse. In order to reduce the high cost of cumulative damage and prevent the final failure of the structure, it is particularly important to monitor the deformation and initial defects of concrete structures in a timely and repeatable manner. Given the adverse effects of structural deterioration on the service life of concrete structures, structural health monitoring has become an important form of ensuring the safety and durability of concrete structures. However, since the monitoring system itself is susceptible to environmental and human factors, on-site stress monitoring of concrete structures still faces major challenges.

[0003] In the process of implementing concrete structure surface monitoring projects, the core component is the sensor, and the installation quality of the sensor directly affects the accuracy of monitoring. Since the fiber grating sensor used for concrete structure surface monitoring needs to be fixed on the concrete surface, in order to improve the accuracy of concrete surface monitoring and expand the use of concrete structure surface monitoring in more different environments, it is particularly important to find a more stable sensor installation method. 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 result of the sensor more accurate.

[0005] The object of the present invention is achieved by: a method for installing a sensor for monitoring the surface quality of a concrete structure, comprising the following steps:

[0006] Step 1: prepare two rectangular steel plates, and set a mounting hole at each of the four corners of the two steel plates; first, grind and clean the surface of the concrete where the sensor is to be installed, and then determine the installation position of the two steel plates according to the installation position and size of the sensor and mark the concrete surface, and then drill corresponding holes on the concrete surface according to the positions of the mounting holes on the steel plates, and finally use expansion bolts to install the two steel plates on the concrete surface;

[0007] Step 2: prepare a sensor simulation rod, the size of which is the same as that of the fiber grating sensor to be installed; install the two ends of the sensor simulation rod on a sensor base respectively, ensure that the two end surfaces of the sensor simulation rod are flush with the outer end surfaces of the sensor base, and ensure 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 constitute a pre-fixed component;

[0008] Step 3: Place the two sensor bases of the pre-fixed components in the center of the surfaces 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 in a one-to-one correspondence to the surfaces of the two steel plates;

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

[0010] Step five, customize the sensor protection shell according to the size of the sensor pre-assembled component, the sensor protection shell includes a semicircular cover plate, two semicircular end plates connected to the two ends of the semicircular cover plate one by one, and two flanges bent horizontally from the two ends of the semicircular plate one by one; 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 protection shell on the sensor pre-assembled component, and face the end plate with the wire outlet hole to the signal line lead-out end of the fiber optic grating sensor, and lead the signal line of the fiber optic 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 protection shell, and then fix the sensor protection shell on the surface of the concrete with four expansion bolts; finally fill the sensor protection shell with thermal insulation and waterproof material from the wire outlet hole of the sensor protection shell.

[0011] In the above-mentioned method for installing a sensor for monitoring the surface quality of a concrete structure, 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.

[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 the concrete structure of the present invention has the following characteristics:

[0014] 1) First, the sensor simulation rod is installed on the sensor base to form a pre-fixed component, and then the pre-fixed component is welded and fixed on two steel plates to avoid direct use of the sensor for welding, otherwise the sensor will be damaged during the welding process, ensuring the installation stability of the fiber grating sensor;

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

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

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

[0018] The present invention will be further described below in conjunction with 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, and set a mounting hole at each of the four corners of the two steel plates 2; first, grind and clean the surface 1 of the concrete where the sensor is to be installed, and then determine the installation position of the two steel plates 2 according to the installation position and size of the sensor and mark the concrete surface, and then drill corresponding holes on the concrete surface 1 according to the positions of the mounting holes on the steel plates 2, and finally use expansion bolts 6 to install 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 grating sensor 4' to be installed; install the two ends of the sensor simulation rod 4 on a sensor base 3 respectively, an open ring is provided on the top surface of the sensor base 3, and after the sensor simulation rod 4 is passed through the open ring, the sensor simulation rod 4 is fastened to the sensor base 3 with the set screws 30 on the open ring, ensuring that the two end surfaces of the sensor simulation rod 4 are flush with the outer end surfaces 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 components in the center of the surfaces 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, and then weld the two sensor bases 3 in a one-to-one correspondence to the surfaces of the two steel plates 2; 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 at 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 grating sensor 4' on the two sensor bases 3, so that the fiber grating sensor 4', the two sensor bases 3 and the two steel plates 2 constitute a sensor pre-assembled component;

[0024] Step 5: Customize the sensor protection shell 5 according to the size of the sensor pre-assembled component. The sensor protection 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 manner, and two flanges 53 horizontally bent from the two ends of the semicircular cover plate 51 in a one-to-one manner; 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 sensor protection cover shell 5 can fine-tune the lateral position; first cover the sensor protection shell 5 on the sensor pre-assembled component, and place the end plate 52 with the wire outlet hole 50 facing the optical fiber. At the signal line lead-out end of the grating sensor 4', the signal line of the fiber grating sensor 4' is led out from the lead-out hole 50; holes are drilled on the surface 1 of the concrete according to the corresponding positions of the bolt holes on the sensor protection shell 5, and then the sensor protection shell 5 is fixed to the surface 1 of the concrete with four expansion bolts 6 to achieve full coverage of the fiber grating sensor 4'; finally, the sensor protection shell 5 is filled with thermal insulation and waterproof material from the lead-out hole 50 of the sensor protection shell 5. The thermal insulation and waterproof material can be made of polyurethane foam glue, which keeps the fiber grating sensor 4' close to the surface temperature of the monitored concrete and at the same time provides waterproof protection for the fiber grating sensor 4', so that the monitoring result is 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 relevant technical field may make various changes or modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions should also belong to 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, and set a mounting hole at each of the four corners of the two steel plates; first, grind and clean the surface of the concrete where the sensor is to be installed, and then determine the installation position of the two steel plates according to the installation position and size of the sensor and mark the concrete surface, and then drill corresponding holes on the concrete surface according to the positions of the mounting holes on the steel plates, and finally use expansion bolts to install the two steel plates on the concrete surface; Step 2: prepare a sensor simulation rod, the size of which is the same as that of the fiber grating sensor to be installed; install the two ends of the sensor simulation rod on a sensor base respectively, ensure that the two end surfaces of the sensor simulation rod are flush with the outer end surfaces of the sensor base, and ensure 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 constitute a pre-fixed component; Step 3: Place the two sensor bases of the pre-fixed components in the center of the surfaces 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 in a one-to-one correspondence to the surfaces of the two steel plates; Step 4: After the weld is cooled, remove the sensor simulation rod from the two sensor bases, assemble the fiber grating sensor on the two sensor bases, so that the fiber grating sensor, the two sensor bases and the two steel plates constitute a sensor pre-assembled component; Step five, customize the sensor protection shell according to the size of the sensor pre-assembled component, the sensor protection shell includes a semicircular cover plate, two semicircular end plates connected to the two ends of the semicircular cover plate one by one, and two flanges bent horizontally from the two ends of the semicircular plate one by one; 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 protection shell on the sensor pre-assembled component, and face the end plate with the wire outlet hole to the signal line lead-out end of the fiber optic grating sensor, and lead the signal line of the fiber optic 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 protection shell, and then fix the sensor protection shell on the surface of the concrete with four expansion bolts; finally fill the sensor protection shell with thermal insulation and waterproof material from the wire outlet hole of the sensor protection shell.

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 protection shell are lateral waist-shaped holes.

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