CN110967474A - Building strength detection method - Google Patents
Building strength detection method Download PDFInfo
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- CN110967474A CN110967474A CN201911331490.2A CN201911331490A CN110967474A CN 110967474 A CN110967474 A CN 110967474A CN 201911331490 A CN201911331490 A CN 201911331490A CN 110967474 A CN110967474 A CN 110967474A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/38—Concrete; ceramics; glass; bricks
- G01N33/383—Concrete, cement
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
- G01N29/07—Analysing solids by measuring propagation velocity or propagation time of acoustic waves
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/40—Investigating hardness or rebound hardness
- G01N3/52—Investigating hardness or rebound hardness by measuring extent of rebound of a striking body
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0003—Steady
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0017—Tensile
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0076—Hardness, compressibility or resistance to crushing
- G01N2203/0083—Rebound strike or reflected energy
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/025—Geometry of the test
- G01N2203/0252—Monoaxial, i.e. the forces being applied along a single axis of the specimen
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0676—Force, weight, load, energy, speed or acceleration
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/01—Indexing codes associated with the measuring variable
- G01N2291/011—Velocity or travel time
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/023—Solids
- G01N2291/0232—Glass, ceramics, concrete or stone
Abstract
The invention relates to a building strength detection method, which comprises the following steps: obtaining a sound velocity value by an ultrasonic method; obtaining a rebound value by a rebound method; obtaining the extraction force by an extraction method; acquiring a measuring area, and matching a corresponding functional relation according to the relation between a preset functional relation and the measuring area; the functional relation comprises a first functional formula corresponding to the sound velocity value, a second functional formula corresponding to the rebounding position and a third functional formula corresponding to the pulling force, the first functional formula is substituted into the sound velocity value to obtain first conversion strength, the second functional formula is substituted into the rebounding value to obtain second conversion strength, and the third functional formula is substituted into the pulling force to obtain third conversion strength. The method has the advantage of improving the measurement precision according to the measurement area.
Description
Technical Field
The invention relates to the technical field of building detection, in particular to a building strength detection method.
Background
The building industry in China develops rapidly in recent decades, in the continuous development period of buildings, the building structure has a new and old alternation phenomenon, the service function of old buildings is reduced along with the damage of building components and the long-term environmental erosion of materials, or the buildings are reformed and the service function of the buildings is changed due to the limitation of the design and the construction level at that time, even the conditions that the load is increased to exceed the original design value and the like cause the project to have to be reinforced and identified. Only by accurate detection and identification of the engineering, adverse conditions and influences of the building caused by changes can be evaluated, and further an effective solution can be provided for the problems, so that the purposes of prolonging the service time of the structure, saving resources and improving the economic efficiency of the structure are achieved. And the reliable identification and evaluation of the building are the basis for building reinforcement and the first problem of engineering reinforcement. Therefore, for buildings with long service life and severe environment or buildings suffering from natural disasters, investigation and inspection are needed, reliability identification is needed, accurate identification and evaluation are needed, and the identification and evaluation are used as a basis for structural reinforcement design.
The concrete strength is a key factor for determining the bearing capacity and other mechanical properties of newly built and built concrete structures or members, and the concrete strength detection technology is a very important content in engineering structure detection and is divided into non-damage detection and local damage detection. The non-damage detection method includes a surface indentation method, a rebound method, a vibration method (including a sonic velocity method and a resonance method), an ultrasonic rebound synthesis method, and the like. The method for detecting the local damage includes a core drilling method, a pull-out method, a penetration resistance method, a breaking method, a pull-off method, and the like. The three concrete strength detection methods of the rebound method, the ultrasonic rebound comprehensive method and the core drilling method are the most widely applied concrete strength detection technologies in the current engineering detection. The application and comparative analysis of the three detection methods in the detection and identification of three specific projects are discussed around the accuracy of the three concrete strength detection methods, the selection of the concrete strength detection method and other problems. The following work is mainly performed:
the resilience method and the ultrasonic resilience comprehensive method in the three concrete strength detection methods are simple and convenient, have no damage to the structure at all, are suitable for being adopted in a large area to obtain a large amount of information, and the information can be used for calculating the concrete strength, detecting the uniformity of the concrete quality by utilizing the sound time and the sound velocity, searching weak parts, detecting cracks and purposefully controlling or processing the bearing capacity or the deformation performance. The core drilling method has local damage to the structure, but is the best method for visually inspecting the internal condition of the component and evaluating the strength at present.
However, the measured strength of the concrete may have a certain error from the actual strength due to the region, and therefore, the measurement result needs to be corrected.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a building strength detection method which has the advantage of improving the measurement precision according to the measurement area.
The above object of the present invention is achieved by the following technical solutions:
a building strength detection method comprises the following steps: obtaining a sound velocity value by an ultrasonic method; obtaining a rebound value by a rebound method; obtaining the extraction force by an extraction method; acquiring a measuring area, and matching a corresponding functional relation according to the relation between a preset functional relation and the measuring area; the functional relation comprises a first functional formula corresponding to the sound velocity value, a second functional formula corresponding to the rebounding position and a third functional formula corresponding to the pulling force, the first functional formula is substituted into the sound velocity value to obtain first conversion strength, the second functional formula is substituted into the rebounding value to obtain second conversion strength, and the third functional formula is substituted into the pulling force to obtain third conversion strength.
Furthermore, an ultrasonic method experiment is carried out, the voltage of a power supply is checked before the instrument is powered on, the instrument is preheated for 10 minutes after the power supply is connected, a parallel surface is selected on the side surface of each concrete test block in the pouring direction, then the ultrasonic testing five points are symmetrically arranged along the diagonal line of the two surfaces, and the test points are uniformly arranged.
Furthermore, 5 points are taken on the corresponding test surface by the ultrasonic method, good acoustic coupling between the transducer and the test surface is ensured, the opposite measurement method is adopted during testing, the transmitting transducer and the receiving transducer are on the same axis, and the average value of the sound velocity values of the 5 points is taken as the rebound value.
Furthermore, when a rebound method experiment is carried out, according to technical rules for evaluating the compressive strength of concrete by a rebound method during testing, the measuring points are uniformly distributed in the measuring area range and cannot be arranged on air holes or exposed stones, the distance between two adjacent measuring points is generally not less than 30mm, the distance between the measuring point and the edge of the test piece is not less than 50mm, and the same measuring point is allowed to bounce only once.
Furthermore, each bullet 8 times on a corresponding test surface of the test block during the rebound method test, 16 rebound values are measured in total, 3 maximum values and 3 minimum values are removed, and the average of the remaining 10 rebound values is taken as the rebound value of the test block.
Furthermore, when the pulling-out method experiment is carried out, the expanding spring is inserted into the forming hole, the expanding spring anchoring step is completely embedded into the annular groove through the expanding rod, the anchoring reliability is ensured, the pulling-out instrument and the anchoring piece are connected and centered through the pull rod, and is vertical to the surface of the concrete, the applied extraction force is continuously and uniformly, the speed is controlled to be 0.5-1.0 kN/s, the extraction force is applied until the concrete is cracked and damaged and the reading of the force measuring display is not increased any more, the recorded limit extraction force value is accurate to 0.1kN, when the structure or the component is detected, effective measures are taken to prevent the extraction instrument and the machine from falling off and breaking or hurting people, when abnormality occurs in the extraction detection process, detailed records are made, the value is cut off, and (3) a measuring point is compensated and measured nearby, after the concrete is pulled out and detected, the damaged part of the concrete caused by the pulling out and detection is repaired, and the average value of the pulling out forces of the plurality of measuring points is taken as the pulling out force.
In summary, the invention includes at least one of the following beneficial technical effects:
and calling a function relation of the corresponding measurement region and calculation conversion strength related to the sound velocity value, the rebound value and the extraction force according to different measurement regions to obtain a first conversion strength, a second conversion strength and a third conversion strength corresponding to the sound velocity value, the rebound value and the extraction force. The measurement results are brought closer to the actual values.
Drawings
FIG. 1 is a flow chart of the method of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The invention discloses a building strength detection method, as shown in figure 1, comprising the following steps:
obtaining a sound velocity value by an ultrasonic method;
obtaining a rebound value by a rebound method;
obtaining the extraction force by an extraction method;
acquiring a measuring area, and matching a corresponding functional relation according to the relation between a preset functional relation and the measuring area;
the function relation comprises a first function corresponding to the sound velocity value, a second function corresponding to the rebounding position and a third function corresponding to the pulling force, the first function is substituted into the sound velocity value to obtain first conversion strength, the second function is substituted into the rebounding value to obtain second conversion strength, and the third function is substituted into the pulling force to obtain third conversion strength.
The experimental process and method are as follows:
the equipment and instruments related to the experiment, such as a resiliometer, an ultrasonic instrument, a puller and the like used in the experiment, are required to be in a standard state when working, calibration and maintenance are required before and after the test, and a rate fixed value is recorded.
When the ultrasonic method experiment is carried out, the voltage of a power supply is checked before the instrument is connected with the power supply, the instrument is preheated for 10 minutes after the power supply is connected, a parallel surface is selected on the side surface of each concrete test block in the pouring direction, then the ultrasonic testing five points are symmetrically arranged along the diagonal line of the two surfaces, and the test points are uniformly arranged. The ultrasonic method takes 5 points on the corresponding test surface, simultaneously ensures that the transducer and the test surface have good acoustic coupling, and adopts a butt-measuring method during testing, and the transmitting transducer and the receiving transducer are on the same axis. And obtaining a sound speed value.
When the rebound method experiment is carried out, the measuring points are uniformly distributed in the measuring area range according to technical rules for evaluating the compressive strength of the concrete by the rebound method during the test, the measuring points are not required to be arranged on air holes or exposed stones, the distance between two adjacent measuring points is generally not less than 30mm, the distance between the measuring point and the edge of the test piece is not less than 50mm, and the same measuring point is only allowed to bounce once. And (3) during the rebound method test, each rebound on a corresponding test surface of the test block is carried out for 8 times, 16 rebound values are measured totally, 3 maximum values and 3 minimum values are removed, and the rest 10 rebound values are averaged to be used as the rebound values of the test block.
The method comprises the following steps of carrying out an extraction method experiment, inserting an expansion spring into a forming hole, completely embedding an expansion spring anchoring step into an annular groove through an expansion rod to ensure reliable anchoring, connecting and centering an extraction instrument and an anchoring part through a pull rod, enabling the extraction instrument to be vertical to the surface of concrete, continuously and uniformly applying extraction force, controlling the speed to be 0.5-1.0 kN/s, applying the extraction force until the concrete is cracked and damaged and the reading of a force measurement display is not increased any more, recording the limit extraction force value to be accurate to 0.1kN, taking effective measures to prevent the extraction instrument and an implement from falling off or injuring people when a structure or a component is detected, carrying out detailed recording when abnormality occurs in the extraction detection process, omitting the value, supplementing a measuring point nearby the value, and repairing the damaged part of the concrete caused by extraction detection after the extraction detection. When the difference between the maximum and minimum extraction forces of the 3 extraction forces of the component and the intermediate value is less than 15% of the intermediate value, taking the minimum value as the calculated value of the extraction force of the component; when in addition, the added 2 pulling force values and the minimum pulling force value are averaged together, and then the average value is compared with the middle value of the pulling force of the previous time, and the smaller value is taken as the calculated value of the pulling force of the component; and calculating a strength conversion value according to the calculated value of the pull-out force of the single component to be used as the concrete strength estimation value of the single component.
The first function is: f. of1＝a*Ci bWherein f is1As a first converted intensity, CiAnd a and b are sound velocity values, and the a and b are corresponding equation coefficients of the measurement region.
The first function is: f. of2＝c*Ri dWherein f is2As a first converted intensity, RiAnd c and d are the corresponding equation coefficients of the measurement area.
The third function is: f. of3＝ePi+ g, wherein, f3Is the third converted intensity, PiThe drawing forces KN, e and g are the corresponding equation coefficients of the measuring area.
Because the equation coefficients a, b, c, d, e and g can change according to the equation coefficients of different measurement areas so as to better fit the local conversion strength, the error between the finally obtained conversion strength and the actual conversion strength is smaller, and the measurement precision is improved.
The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (6)
1. A building strength detection method is characterized by comprising the following steps:
obtaining a sound velocity value by an ultrasonic method;
obtaining a rebound value by a rebound method;
obtaining the extraction force by an extraction method;
acquiring a measuring area, and matching a corresponding functional relation according to the relation between a preset functional relation and the measuring area;
the functional relation comprises a first functional formula corresponding to the sound velocity value, a second functional formula corresponding to the rebounding position and a third functional formula corresponding to the pulling force, the first functional formula is substituted into the sound velocity value to obtain first conversion strength, the second functional formula is substituted into the rebounding value to obtain second conversion strength, and the third functional formula is substituted into the pulling force to obtain third conversion strength.
2. The building strength detection method according to claim 1, wherein during the ultrasonic experiment, the instrument checks the voltage of the power supply before the power supply is turned on, the instrument is preheated for 10 minutes after the power supply is connected, a parallel surface is selected on the side surface of each concrete test block in the pouring direction, then the ultrasonic test five points are symmetrically arranged along the diagonal line of the two surfaces, and the test points are uniformly arranged.
3. The building strength detection method according to claim 1, wherein 5 points are taken on the corresponding test surface by an ultrasonic method, good acoustic coupling between the transducer and the test surface is ensured, a counter-measuring method is adopted during the test, the transmitting transducer and the receiving transducer are on the same axis, and the average value of sound velocity values of the 5 points is taken as a rebound value.
4. The building strength detection method according to claim 1, wherein in the rebound method experiment, the test points are uniformly distributed in the test area range according to technical rules for evaluating the concrete compressive strength by the rebound method during the test, the test points are not required to be arranged on air holes or exposed stones, the distance between two adjacent test points is generally not less than 30mm, the distance between the test point and the edge of the test piece is not less than 50mm, and the same test point is allowed to bounce only once.
5. The building strength detection method according to claim 1, wherein each bounce on a corresponding test surface of the test block is 8 times during the rebound method test, 16 rebound values are measured in total, 3 maximum values and 3 minimum values are removed, and the average of the remaining 10 rebound values is taken as the rebound value of the test block.
6. The building strength detection method according to claim 1, wherein a pull-out test is performed, wherein the expansion spring is inserted into the forming hole, the anchoring step of the expansion spring is completely embedded into the annular groove through the expansion rod, the anchoring is ensured to be reliable, the pull-out instrument and the anchoring member are connected and centered by the pull rod and are perpendicular to the surface of the concrete, the pulling-out force is continuously and uniformly applied, the speed is controlled to be 0.5-1.0 kN/s, the pulling-out force is applied until the concrete is cracked and damaged and the reading of the force measurement display is not increased, the recording limit pulling-out force value is accurate to 0.1kN, when the structure or the component is detected, effective measures are taken to prevent the pull-out instrument and the machine from falling and breaking or hurting people, when abnormality occurs in the pulling-out detection process, detailed recording is performed, the value is omitted, a measuring point is additionally measured nearby, and the damaged part of the concrete caused by the pulling-out detection is repaired after the pulling-out detection, and taking the average value of the pull-out forces of the plurality of measuring points as the pull-out force.
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| CN201911331490.2A CN110967474A (en) | 2019-12-21 | 2019-12-21 | Building strength detection method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111948295A (en) * | 2020-08-19 | 2020-11-17 | 深圳职业技术学院 | Fault detection system based on sound waves and motor fault detection method |
| CN113324863A (en) * | 2021-06-28 | 2021-08-31 | 上海绿地建设(集团)有限公司第五分公司 | Rapid nondestructive testing method for surface wave construction quality of building construction |
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| CN104251882A (en) * | 2014-09-30 | 2014-12-31 | 湖南理工学院 | Establishment method of concrete compression strength curve |
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| CN101303329A (en) * | 2008-06-13 | 2008-11-12 | 东南大学 | Integrated strength testing method based on neural network technology |
| CN104251882A (en) * | 2014-09-30 | 2014-12-31 | 湖南理工学院 | Establishment method of concrete compression strength curve |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111948295A (en) * | 2020-08-19 | 2020-11-17 | 深圳职业技术学院 | Fault detection system based on sound waves and motor fault detection method |
| CN113324863A (en) * | 2021-06-28 | 2021-08-31 | 上海绿地建设(集团)有限公司第五分公司 | Rapid nondestructive testing method for surface wave construction quality of building construction |
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Application publication date: 20200407 |