CN114659441A - Method for measuring micro-deformation of building surface - Google Patents

Abstract

The invention relates to a building deformation measurement technology, in particular to a method for measuring micro deformation of a building surface, which comprises the steps of burying piezoelectric sensors at intervals at the same horizontal height of a building, forming a piezoelectric sensing network by a plurality of piezoelectric sensors at the same horizontal height, transmitting signals of the plurality of piezoelectric sensors to a signal processor, and analyzing and processing data by the signal processor to obtain the deformation condition of the building surface; according to the invention, the piezoelectric sensors which are arranged at intervals are arranged at the same horizontal height of the building to form a piezoelectric sensing network, so that the influence of the external load on the building can be monitored in real time, and the deformation condition with the time sequence characteristic is further judged through the real-time measurement data so as to judge whether the external load substantially influences the building or not, and the problem of insufficient accuracy of the measurement of the micro-deformation of the building by single measurement in the prior art is effectively solved.

Description

A method for measuring micro-deformation of building surfaces

technical field

The invention relates to building deformation measurement technology, in particular to a measurement method for building surface micro-deformation.

Background technique

Deformation of a building refers to the phenomenon that its shape or position changes under load. According to the industry standard "Code for Measurement of Building Deformation" (JGJ 8-2016), the deformation of buildings can be divided into two categories: settlement and displacement. Among them, settlement refers to vertical deformation, including sinking and rising; while displacement It is a general term for other deformations except settlement, including horizontal displacement, inclination, deflection, crack, convergence deformation, wind vibration deformation and sunshine deformation. It is of great significance to measure the deformation of a building under load. For example, after detecting the slight deformation of the building and the trend of increasing deformation, the incalculable loss of personnel and property can be avoided by quickly formulating an emergency plan. Therefore, An effective and low-cost detection scheme is particularly important.

In the prior art, for example, Chinese Patent Publication No. CN103884291A discloses a method for monitoring flexible deformation of building surfaces based on NURBS parametric curved surfaces. The NURBS surface is modeled, and then the parameters of the NURBS parametric surface are reversed to obtain the corresponding points of the point cloud model of the building before and after deformation. According to the deformation of the corresponding points before and after deformation, the deformation of each point of the building can be quickly and accurately calculated. The above technical solution can indeed quickly determine the amount of deformation of the current building relative to before deformation in a single measurement, but for the small deformation of the building surface, three-dimensional laser scanning equipment is erected at different time nodes to obtain the building. Deformation trend conclusion, the cost is high, the implementation is more difficult. Another example is Zhou Xiao et al. in the article "Research on Building Micro-deformation Measurement Based on GB-SAR", which introduced the working principle and key technology of the micro-deformation monitoring system (IBIS-L) based on the ground-based synthetic aperture radar interferometry technology. The analysis and processing of the monitoring data of the building yielded a deformation result that is better than the millimeter-level accuracy in the radar line-of-sight direction. Experiments show that the IBIS system can achieve high-resolution, high-precision, and real-time building deformation monitoring. However, the professional requirements of this technology are relatively high, and the cost of implementation is relatively high, so it is difficult to popularize and apply it at this stage.

SUMMARY OF THE INVENTION

In view of the deficiencies in the prior art, the purpose of the present invention is to provide a method for measuring the micro-deformation of the building surface.

In order to achieve the above object, the present invention adopts the following technical solutions to realize:

A method for measuring the micro-deformation of a building surface, the measuring method comprises burying piezoelectric sensors arranged at intervals at the same level of the building, and a plurality of piezoelectric sensors located at the same level form a piezoelectric sensor Network, the signals of multiple piezoelectric sensors are transmitted to the signal processor, and the data is analyzed and processed by the signal processor to obtain the deformation of the building surface.

In a further technical solution, the piezoelectric sensor networks are arranged in multiple groups at intervals along the height direction of the building.

In a further technical solution, each piezoelectric sensor network is correspondingly arranged in the middle and lower parts of each building, preferably at the bottom of each building.

In a further technical solution, the signal processor specifically analyzes the influence of the pressure imbalance of the building at different positions at the same height on the current and voltage differences of the plurality of piezoelectric sensors, and the preset electrical signal warning If the value exceeds the preset warning value, the alarm device in the corresponding direction will be triggered to obtain the deformation of the building surface.

In a further technical solution, the piezoelectric sensor includes a protection box made of carbon fiber reinforced composite material, the piezoelectric material is pre-fixed in the protection box, and the inner wall of the protection box and the piezoelectric material are between All are equipped with springs to transmit pressure.

Compared with the prior art, the present invention has the following technical effects:

The method for measuring the micro-deformation of the building surface provided by the present invention can monitor the influence of external loads on the building in real time by setting a plurality of piezoelectric sensors arranged at intervals at the same level of the building to form a piezoelectric sensing network. , and further determine the deformation with time series characteristics through the real-time measurement data, so as to determine whether the external load has a substantial impact on the building, which effectively solves the problem of the accuracy of the measurement of the micro-deformation of the building by a single measurement in the prior art. Sexual insufficiency.

Further, based on the measurement scheme provided by the present invention, the micro-deformation of the building surface is judged with time series characteristics, and then the deformation tendency of the building surface can be judged in a timely and accurate manner, so as to gain time for the formulation of the emergency plan, so as to avoid damage to personnel and property. damage caused by loss;

Furthermore, in the solution provided by the present invention, through the setting of the piezoelectric sensor network, the grasp of the deformation of the building surface in different directions can be further improved, and the judgment accuracy of the micro-deformation of the building surface can be improved.

Other features and advantages of the present invention will be described in detail in the detailed description which follows.

Detailed ways

In order to make the technical means, creation features, achievement goals and effects of the present invention easy to understand and understand, the present invention will be further explained below with reference to specific embodiments.

As mentioned above, the present invention provides a method for measuring the micro-deformation of a building surface, the measuring method comprises burying piezoelectric sensors arranged at intervals at the same level of the building, The piezoelectric sensor forms a piezoelectric sensor network, and the signals of the multiple piezoelectric sensors are transmitted to the signal processor, and the data is analyzed and processed by the signal processor to obtain the deformation of the building surface.

In the measurement method provided by the present invention, by setting a plurality of piezoelectric sensors arranged at intervals at the same level of the building to form a piezoelectric sensing network, the influence of external loads on the building can be monitored in real time, and further Through the real-time measurement data, the deformation situation with time series characteristics is judged, so as to judge whether the external load has a substantial impact on the building, which effectively solves the problem of insufficient accuracy of the single measurement of the building micro-deformation measurement in the prior art. question.

Further, based on the measurement scheme provided by the present invention, the micro-deformation of the building surface is judged with time series characteristics, and then the deformation tendency of the building surface can be judged in a timely and accurate manner, so as to gain time for the formulation of the emergency plan, so as to avoid damage to personnel and property. damage caused by loss;

Furthermore, in the solution provided by the present invention, through the setting of the piezoelectric sensor network, the grasp of the deformation of the building surface in different directions can be further improved, and the judgment accuracy of the micro-deformation of the building surface can be improved.

According to the measurement method provided by the present invention, in the present invention, there is no special requirement for the spacing of the piezoelectric sensors buried at the same level, as long as the deformation of the building can be effectively monitored, and the spacing between adjacent piezoelectric sensors The smaller it is, the pressure change on the building surface can be measured with higher accuracy, and the deformation of the building surface can be fed back with higher accuracy, but it will lead to an increase in the implementation cost of the solution. As the distance between adjacent piezoelectric sensors increases. If it is large, the monitoring accuracy of the deformation of the building surface will be correspondingly reduced. In a specific embodiment of the present invention, the buried spacing of adjacent piezoelectric sensors is 1m-3m.

According to the measurement method provided by the present invention, in the present invention, in order to improve the grasp of the deformation of the building at different heights, the piezoelectric sensing networks are arranged in multiple groups at intervals along the height direction of the building. Setting piezoelectric sensor networks at different heights can further verify the deformation of the building surface in the same direction and improve the judgment accuracy of the deformation.

Further, in the measurement method provided by the present invention, each piezoelectric sensing network is correspondingly arranged in the middle and lower parts of each building. By arranging the piezoelectric sensor in the middle and lower part of each building, the pressure change of the building under the load can be effectively measured. Particularly preferably, each piezoelectric sensor network is correspondingly arranged on each building. bottom of. This also facilitates construction and confirmation of the same level.

According to the measurement method provided by the present invention, in the present invention, the signal processor specifically analyzes the influence of the pressure imbalance of the building at different positions at the same height on the current and voltage differences of the plurality of piezoelectric sensors, and the pre- The set electrical signal warning value is compared with the numerical value. If the value exceeds the preset warning value, the alarm device in the corresponding direction is triggered to obtain the deformation of the building surface.

In the present invention, the function of the piezoelectric sensor is to apply the surface deformation signal of the building to the piezoelectric sensor in the form of pressure, thereby generating a change in the electrical signal, that is, converting the measurement of the mechanical quantity into the measurement of the electrical quantity to feedback pressure imbalance in the building. In a specific embodiment of the present invention, the piezoelectric sensor includes a protection box made of carbon fiber reinforced composite material, the piezoelectric material is pre-fixed in the protection box, and the inner wall of the protection box is connected to the pressure There are springs between the electrical materials to transmit pressure. The piezoelectric material is protected by the protection box made of the carbon fiber reinforced composite material to avoid physical damage when it is embedded in the building wall.

According to the measurement method provided by the present invention, in the present invention, the piezoelectric material can be selected from a piezoelectric material with positive piezoelectric effect known to those in the art, for example, the piezoelectric material can be specifically selected as polarized vinyl fluoride.

Based on the measurement method provided by the present invention, the deformation of the building surface is monitored, which has strong real-time performance, and can effectively feedback the tendency deformation phenomenon, which provides a better guarantee for the safety of the building.

The above shows and describes the basic principles, main features and characteristics of the present invention. Those skilled in the art should understand that the present invention is not limited by the above-mentioned embodiments, and the descriptions in the above-mentioned embodiments and the description are only to illustrate the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have Various changes and modifications are intended to fall within the scope of the claimed invention. The claimed scope of the present invention is defined by the appended claims and their equivalents.

Claims (5)

1. a measuring method for the micro-deformation of building surface, it is characterized in that, described measuring method comprises the piezoelectric sensor that is arranged at intervals at the same level of the building, a plurality of piezoelectric sensors positioned at the same level A piezoelectric sensor network is formed, the signals of multiple piezoelectric sensors are transmitted to the signal processor, and the data is analyzed and processed by the signal processor to obtain the deformation of the building surface. 2 . The measurement method according to claim 1 , wherein the piezoelectric sensor networks are arranged in multiple groups at intervals along the height direction of the building. 3 . 3 . The measuring method according to claim 2 , wherein each piezoelectric sensing network is correspondingly arranged in the middle and lower parts of each building, preferably the bottom of each building. 4 . 4. The measurement method according to claim 1, characterized in that, the signal processor specifically measures the current-voltage difference of a plurality of piezoelectric sensors by analyzing the pressure imbalance of the building at different positions of the same height. If the value exceeds the preset warning value, the alarm device in the corresponding direction will be triggered to obtain the deformation of the building surface. 5 . The measuring method according to claim 1 , wherein the piezoelectric sensor comprises a protection box made of carbon fiber reinforced composite material, the piezoelectric material is pre-fixed in the protection box, and the protection box is pre-fixed. 6 . There are springs between the inner wall of the box and the piezoelectric material for transmitting pressure.