WO2022000719A1

WO2022000719A1 - Intelligent building sensor detection method

Info

Publication number: WO2022000719A1
Application number: PCT/CN2020/108825
Authority: WO
Inventors: 孙峰; 王现伟
Original assignee: 江苏东曌建筑产业创新发展研究院有限公司
Priority date: 2020-07-03
Filing date: 2020-08-13
Publication date: 2022-01-06
Also published as: CN113884110A

Abstract

The present invention relates to an intelligent building sensor detection method, the method comprising the following steps: 101, before building pouring, laying a fiber grating sensor on a steel bar of a building steel bar framework; 102, after step 101, pouring and vibrating concrete; 103, establishing a building steel bar inclination model; and 104, calculating, according to detection data of the fiber grating sensor, a building inclination displacement by means of the steel bar inclination model. A fiber grating sensor is used in the present invention, and same has the advantages of having a high measurement precision, a long transmission distance and a strong operability, being durable and practical, being capable of automatically collecting data etc., is not affected by weather, the surrounding environment of the building and the height of the building, and can make up for defects in existing building inclination inspection methods.

Description

A kind of intelligent building sensor detection method

technical field

The invention relates to the technical field of building monitoring, in particular to an intelligent building sensor detection method.

Background technique

During the construction or use of the building, deformation often occurs due to various reasons. If this deformation exceeds the standard value of the building, it will affect the normal use of the building, even endanger the safety of the building, and affect the safety of life and property. Therefore, during the construction and operation of engineering buildings, it is necessary to monitor the deformation of buildings. The content of deformation monitoring mainly includes monitoring of displacement, settlement, inclination, cracks, etc. Among them, inclination monitoring is one of the main contents of building deformation and an important indicator to measure the safety of buildings.

Commonly used tilt monitoring methods include hanging hammer line method, theodolite measurement method, laser plumb instrument measurement method and total station measurement method. The hanging hammer line method and theodolite measurement method are easily affected by external wind and site conditions. In the process of building verticality inspection, the operation is difficult and the accuracy is low. It is only suitable for the case of lower buildings or vertical axis transmission; the laser plumb instrument projection measurement method needs to reserve the size of the hole, which is not easy to grasp during construction, and its size is small. It is inconvenient for casting and surveying, and it is not conducive to the safety of instruments and personnel. It is not suitable for the situation where there are many obstructions above the building. The total station is currently widely used in engineering surveying, but this method requires visibility of the surrounding environment. Higher, the monitoring is greatly affected by the weather, and there is a certain monitoring distance limit.

Fiber Bragg grating sensing technology was developed rapidly with the development of optical fiber communication technology in the 1970s. It takes light wave as the carrier and optical fiber as the medium to sense and transmit the external measured signal. The pioneer of technology has been widely used in some important fields, such as inertial navigation, military warning, intelligent material structure, testing and control, robotics and information processing.

Therefore, how to provide an intelligent building sensor detection method to achieve accurate inspection data, convenient installation and operation, wide application range, and not be affected by the external environment and site conditions is a technical problem to be solved urgently by those skilled in the art.

SUMMARY OF THE INVENTION

In view of this, the purpose of the present application is to provide an intelligent building sensor detection method, so as to achieve accurate inspection data, convenient installation and operation, wide application range, and not be affected by external environment and site conditions.

In order to achieve the above purpose, the present application provides the following technical solutions.

An intelligent building sensor detection method, comprising the following steps:

101. Before the building is poured, the fiber grating sensor is arranged on the steel bars of the building steel frame;

102. After step 101, pour concrete and vibrate;

103. Establish a model of building steel bar inclination;

104. According to the detection data of the fiber grating sensor, the tilting displacement of the building is calculated through the steel bar tilting model.

Preferably, the steel bars on which the fiber grating sensor is arranged in the step 101 are located on the corner posts outside the building, and are close to the outside of the corner posts.

Preferably, in the step 101, the fiber grating sensor is fixed on the steel bar with adhesive, and the elastic modulus of the adhesive is the same as the elastic modulus of the steel bar.

Preferably, in the step 101, after the adhesive is solidified, the fiber grating sensor and the steel bar are wrapped again with a fixing tape, and the fixing tape is gauze or waterproof tape.

Preferably, in the step 101, the fiber grating sensors are arranged in pairs in the X-axis and Y-axis directions of the steel bars, and the X-axis and Y-axis directions are both perpendicular to the outer wall of the building and along the outer wall of the building. direction of the wall.

Preferably, in the step 103, establishing a building reinforcement inclination model includes the following steps:

201. First define the relationship between the strain generated by the fiber grating sensor and the length of the fiber grating;

202. Calculate the inclination displacement of each building along the X axis and the Y axis;

_{203. Calculate the inclination displacement V S} at the node of each floor of the building;

204. Calculate the tilt displacement V at the node of the top building;

205. Define the inclination formula to obtain the inclination displacement i of the building.

Preferably, the calculation formula of the strain generated by the fiber grating sensor in the step 201 and the length of the fiber grating is:

where:

is the average strain of the reinforcement, ΔL is the total deformation of the reinforcement element, and L is the length of the reinforcement element.

Preferably, the formula for calculating the average strain of the steel bars along the X-axis and the Y-axis in step 202 is:

where:

is the average strain of the reinforcement along the X-axis,

is the average strain of the steel bar along the Y-axis direction, ε _X1 and ε _X2 are the strain values of a pair of fiber grating sensors along the X-axis direction, and ε _Y1 and ε _Y2 are the strain values of a pair of fiber grating sensors;

It is defined that the strain generated by the steel bar is equal to the strain generated by the fiber grating sensor, which leads to:

From this, the tilt displacement of the building along the X-axis and Y-axis is:

In the formula: V _X is the displacement of the building tilting along the X-axis direction, and V _Y is the tilting displacement of the building along the Y-axis direction.

Preferably, in step 203, the inclination displacement V _S at each building node of each floor is:

In the step 204, the tilt displacement V at the node of the top building is the sum of the tilt displacement at the node of each building, that is:

Preferably, the calculation formula of the building inclination displacement i in step 205 is:

Beneficial technical effect obtained by the present invention:

1) The present invention solves the defects existing in the prior art. The present invention adopts a fiber grating sensor, which has the advantages of high measurement accuracy, long transmission distance, strong operability, durability and practicality, and automatic data collection. , The influence of the surrounding environment of the building and the height of the building can make up for the shortcomings of the current building inclination inspection method;

2) The present invention firstly embeds the fiber grating sensor together with the steel bars in the building corner posts, and uses the measured strain value and the geometric structure relationship to establish and obtain the building steel bar inclination model, with high detection data accuracy;

3) The present invention has a wide range of applications, not only for low-rise buildings, but also for inclination detection of mid-rise, high-rise and super-high-rise buildings.

The above description is only an overview of the technical solution of the present application, in order to be able to understand the technical means of the present application more clearly, so that it can be implemented according to the content of the description, and in order to make the above and other purposes, features and advantages of the present application more clearly understandable , the preferred embodiments of the present application and the accompanying drawings are described in detail below.

The above and other objects, advantages and features of the present application will be more apparent to those skilled in the art from the following detailed description of the specific embodiments of the present application in conjunction with the accompanying drawings.

Description of drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are For some embodiments of the present application, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without any creative effort. Similar elements or parts are generally identified by similar reference numerals throughout the drawings. In the drawings, each element or section is not necessarily drawn to actual scale.

Fig. 1 is the layout diagram of the fiber grating sensor in the present invention;

Fig. 2 is the top view of the fiber grating sensor arrangement in the present invention;

FIG. 3 is a simplified diagram of calculating the oblique displacement of steel bars in the present invention.

In the above drawings: 1. Corner column; 2. Steel bar; 3. Fiber Bragg grating sensor.

detailed description

In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments It is a part of the embodiments of the present application, but not all of the embodiments. In the following description, specific details such as specific configurations and components are provided merely to assist in a comprehensive understanding of embodiments of the present application. Accordingly, it should be apparent to those skilled in the art that various changes and modifications of the embodiments described herein can be made without departing from the scope and spirit of the present application. Also, descriptions of well-known functions and constructions are omitted in the embodiments for clarity and conciseness.

Furthermore, this application may repeat reference numerals and/or letters in different instances. This repetition is for the purpose of simplicity and clarity and does not in itself indicate a relationship between the various embodiments and/or arrangements discussed.

The term "and/or" in this article is only an association relationship to describe associated objects, indicating that there can be three kinds of relationships, for example, A and/or B, which can mean: A alone exists, B alone exists, and A and B exist simultaneously. There are three cases of B. In this article, the term "/and" is to describe another related object relationship, which means that there can be two relationships, for example, A/ and B, which can mean that A exists alone, and A and B exist alone. , In addition, the character "/" in this text generally indicates that the related objects are an "or" relationship.

It should also be noted that in this document, relational terms such as first and second are used only to distinguish one entity or operation from another, and do not necessarily require or imply those entities or operations There is no such actual relationship or order between them. Moreover, the terms "comprising", "comprising" or any other variation thereof are intended to encompass non-exclusive inclusion.

Example 1

101. Before the building is poured, arrange the fiber grating sensor 3 on the steel bar 2 of the building steel bar frame.

Among them, as shown in FIG. 1, when laying the fiber grating sensor 3, select the steel bar 2 located on the corner post 1 outside the building, and the steel bar 2 is close to the outside of the corner post 1, so as to prevent the fiber grating sensor 3 from being damaged when pouring concrete.

Further, as shown in FIG. 2 , the fiber grating sensors 3 are arranged in pairs in the X-axis and Y-axis directions of the steel bars 2, and the X-axis and Y-axis directions are both perpendicular to the outer wall of the building and along the in the direction of the exterior wall of the building.

Further, the fiber grating sensor 3 is fixed on the steel bar 2 with adhesive, and the elastic modulus of the adhesive is the same as the elastic modulus of the steel bar 2, so as to ensure that the fiber grating sensor 3 and the steel bar 2 are deformed consistent; After the adhesive is solidified, the fiber grating sensor 3 and the steel bar 2 are wound again with a fixing tape, and the fixing tape is gauze to prevent the fiber grating sensor 3 from being detached during the concrete pouring and vibrating process.

Alternatively, the fixing tape is a waterproof tape to prevent the fiber grating sensor 3 from being detached during the concrete pouring and vibrating process.

Further, the position where the fiber grating sensor 3 is pasted on the steel bar 2 is perpendicular to the inclination direction of the wall.

After the fiber grating sensor 3 is laid out, the fiber grating modem is connected, and the initial data of the fiber grating sensor 3 is cleared.

102. After step 101, pour concrete and vibrate.

103. Establish a building steel bar inclination model.

Model building reinforcement bar slope, including the following steps:

The calculation formula of the strain generated by the fiber grating sensor and the length of the fiber grating is:

where:

The formula for calculating the average strain of the reinforcement along the X-axis and Y-axis is:

where:

is the average strain of the reinforcement along the X-axis,

Moreover, the tilting deformation is relatively small relative to the height of the building, as shown in Figure 3, according to the Pythagorean theorem, it can be concluded that the tilting displacement of the building along the X-axis and Y-axis directions is:

The tilt displacement of the building node on each floor is the vector sum of the tilt displacement of the building along the X-axis and Y-axis directions, that is, the tilt displacement V _S at the building node on each floor is:

204. Calculate the tilt displacement V at the node of the top building;

The building structure is equivalent to a cantilever beam, and the inclination deformation of each layer of the structure is the sum of the inclination deformation produced by the layer and the inclination deformation produced by the following structures. From this, it can be concluded that the inclination displacement V at the node of the top building is: The sum of the tilt displacements at the nodes of each building, namely:

The formula for calculating the inclination i of the building is:

Where: V is the tilt displacement of the building, H is the height of the building.

The formula for calculating the inclination displacement i of the building is:

The data obtained by the detection method in this embodiment is verified by the total station, and the relative error of the tilt displacement is within the range of 2% on average, thus proving the validity of the detection data.

The above descriptions are only preferred embodiments of the present invention, which are not intended to limit the protection scope of the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any changes, modifications, substitutions, integrations and parameter changes to these embodiments without departing from the principles and spirit of the present invention, through conventional substitutions or capable of achieving the same function within the spirit and principles of the present invention, all fall within the scope of the present invention. into the protection scope of the present invention.

Claims

A sensor detection method for an intelligent building, comprising the following steps:

101. Before the building is poured, the fiber grating sensor is arranged on the steel bars of the building steel frame;

102. After step 101, pour concrete and vibrate;

103. Establish a model of building steel bar inclination;

104. According to the detection data of the fiber grating sensor, the tilting displacement of the building is calculated through the steel bar tilting model.
The method for detecting a sensor in an intelligent building according to claim 1, wherein the steel bar on which the fiber grating sensor is arranged in the step 101 is located on the corner post outside the building, and is close to the outer side of the corner post.
The method for detecting a sensor in an intelligent building according to claim 1, wherein in step 101, the fiber grating sensor is fixed on the steel bar with adhesive, and the elastic modulus of the adhesive is the same as the elasticity of the steel bar. Modulus is the same.
The method for detecting a sensor in an intelligent building according to claim 4, wherein in step 101, after the adhesive is solidified, the fiber grating sensor and the steel bar are wrapped with a fixing tape, and the fixing tape is gauze or waterproof tape.
The method for detecting smart building sensors according to claim 1, wherein in step 101, the fiber grating sensors are arranged in pairs in the X-axis and Y-axis directions of the steel bars, and the X-axis and Y-axis directions are both It is the direction perpendicular to and along the outer wall of the building.
The intelligent building sensor detection method according to claim 1 or 3, wherein the step 103 for establishing a building steel bar inclination model includes the following steps:

201. First define the relationship between the strain generated by the fiber grating sensor and the length of the fiber grating;

202. Calculate the inclination displacement of each building along the X axis and the Y axis;

203. Calculate the inclination displacement V S at the node of each floor of the building;

204. Calculate the tilt displacement V at the node of the top building;

205. Define the inclination formula to obtain the inclination displacement i of the building.
The intelligent building sensor detection method according to claim 6, wherein the calculation formula of the strain generated by the fiber grating sensor and the fiber grating length in the step 201 is:

where:
is the average strain of the reinforcement, ΔL is the total deformation of the reinforcement element, and L is the length of the reinforcement element.
The smart building sensor detection method according to any one of claims 1-5, characterized in that, in the step 202, the formula for calculating the average strain of the steel bars along the X-axis and the Y-axis direction is:

where:
is the average strain of the reinforcement along the X-axis,
is the average strain of the steel bar along the Y-axis direction, ε X1 and ε X2 are the strain values of a pair of fiber grating sensors along the X-axis direction, and ε Y1 and ε Y2 are the strain values of a pair of fiber grating sensors;

It is defined that the strain generated by the steel bar is equal to the strain generated by the fiber grating sensor, which leads to:

From this, the tilt displacement of the building along the X-axis and Y-axis is:

In the formula: V X is the displacement of the building tilting along the X-axis direction, and V Y is the tilting displacement of the building along the Y-axis direction.
The intelligent building sensor detection method according to any one of claims 1-5, characterized in that, in the step 203, the inclination displacement V S at the node of each floor of the building is:

In the step 204, the tilt displacement V at the node of the top building is the sum of the tilt displacement at the node of each building, that is:
The intelligent building sensor detection method according to any one of claims 1-5, wherein the calculation formula of the building inclination displacement i in the step 205 is: