CN112798039A - Device for monitoring multidimensional stress strain in reinforced concrete member and mounting method - Google Patents
Device for monitoring multidimensional stress strain in reinforced concrete member and mounting method Download PDFInfo
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- CN112798039A CN112798039A CN202011569696.1A CN202011569696A CN112798039A CN 112798039 A CN112798039 A CN 112798039A CN 202011569696 A CN202011569696 A CN 202011569696A CN 112798039 A CN112798039 A CN 112798039A
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- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
Abstract
The invention discloses a device for monitoring multidimensional stress strain in a reinforced concrete member and an installation method, wherein the device comprises the following steps: the high-strength pressure box comprises a high-strength pressure box sensing wire, a flexible attachment rod, a high-strength pressure box, a strain gauge, a sensitive grid, a strain gauge sensing wire, a pressure box positioning clamp, a hydrolysis bracket, a connecting steel bar protrusion, a hydrolysis box, a strain gauge, a shear wall longitudinal bar, a shear wall horizontal bar, a reinforced concrete column stirrup, a reinforced concrete column longitudinal bar, a reinforced concrete beam waist bar and a reinforced concrete beam stirrup. The steel bar binding device is fixed during steel bar binding, and is simple to operate. The high-strength pressure box is fixed above the flexible attachment rod and forms a multi-dimensional stress-strain monitoring device in the reinforced concrete together with the strain gauge. The leading-out parts of the high-strength pressure box and the strain gauge sensing wire are coated with organic silicon bonding glue for water and heat insulation, so that the sensing wire is prevented from being damaged by heat release in the hydration process of concrete. The high-strength pressure cell sensing wire and the strain gauge sensing wire should be ensured to be of sufficient length.
Description
Technical Field
The invention belongs to the field of mechanical property monitoring of reinforced concrete members, and particularly relates to a device for monitoring multidimensional stress strain in a reinforced concrete member and an installation method.
Background
The reinforced concrete member monitoring is a technology for acquiring structural response and environmental parameters in real time, and the damage of the reinforced concrete member is quickly detected, identified and evaluated by comparing structural analysis and actual monitoring data. The damage of the reinforced concrete member is caused by artificial damage or long-term fatigue accumulation under the environmental action, such as strong wind, earthquake, uneven settlement of foundation and the like. Therefore, the stress strain inside the reinforced concrete member is monitored in real time, and the evaluation of the reinforced concrete member is particularly important. China stipulates in the quality inspection and acceptance of concrete engineering: and (3) testing the strength of the cubic test block which has the same maintenance conditions with the shear wall, the column and the beam and is sampled at the concrete casting position under the same conditions, so as to test the quality of the reinforced concrete test piece. Because the situation that the reinforced concrete test piece faces in the engineering practice is more complicated, and the quality, the strength and the durability of the concrete can be reduced due to improper production process in any step, the safety of the whole building is directly concerned, and the significance of monitoring the performance of the actual engineering member is great.
In view of this, the invention provides a device and an installation method capable of directly monitoring multidimensional stress strain in reinforced concrete. The invention provides a new solution for solving the problem that the existing device can not accurately monitor the internal stress strain of the reinforced concrete.
The invention has the basic principle that the stress strain in the reinforced concrete member is respectively monitored by utilizing a multi-axis attached strain rosette and a high-strength pressure box. The multiaxis adheres to formula strain to flower and comprises plane and vertical flexible adhesion stick, and resistance-type foil gage pastes on flexible adhesion stick. The included angle between each axle in the plane multiaxis attached type strain rosette is 0 degree, 90 degrees, 45 degrees, and the composition form is not unique. And measuring the strain of each axis, and calculating the strain of the plane in any direction according to the strain data of each axis of the plane. Vertical flexible attachment rods are added on the planar flexible attachment rods to form the spatial multi-dimensional attachment type strain flower. The vertical flexible attachment rod is perpendicular to any horizontal flexible attachment rod, the vertical attachment type strain rod and any horizontal attachment type strain rod form a strain flower, strain values are measured by the resistance type strain gauge, and strain values of the vertical surface in all directions are calculated. In sum, the strain value of any point in space can be calculated by the multi-dimensional attached strain flower.
The stress of the reinforced concrete member is measured by the vibrating wire test principle. The high-strength pressure box is connected with each flexible attachment rod through a positioning clamp.
The multi-axis flexible attachment rod is packaged by a hydrolytic material box, and the hydrolytic material box can be selected from high-carbon fatty acid and high-density polyethylene glycol, but is not limited to one. The hydrolysis box is high in hardness and is connected with the steel bar through the circular sleeve at the tail end of the overhanging hydrolysis support, and the monitoring box is fixed inside the reinforced concrete member. The multi-axis attached strain gauge is used for measuring the strain changes of a certain point in different directions in a space, and the strain condition of any position in the reinforced concrete member can be obtained by analyzing monitoring data. The high-strength pressure box is used for directly measuring the internal stress of the reinforced concrete member, and the stress at any position in the reinforced concrete member can be calculated by monitoring the stress in different directions.
The strain and stress testing device provided by the invention has the advantages of high sensitivity, strong durability, extremely low cost and small occupied space, and is suitable for monitoring multidimensional stress strain in a reinforced concrete member.
Disclosure of Invention
In order to solve the problem that the conventional device cannot meet the actual requirement of the actual reinforced concrete project, the invention provides a device for monitoring multi-dimensional stress strain in a reinforced concrete member and an installation method. The invention has the advantages of simple installation, accurate measurement and no influence on the material performance of the reinforced concrete internal member, and provides a new solution for solving the problem that the existing device can not monitor the multidimensional stress strain in the reinforced concrete member in real time.
In order to achieve the above object, the present invention adopts the following technical solutions.
A device for monitoring multidimensional stress strain in a reinforced concrete member comprises a high-strength pressure box sensing line (1), a flexible attachment rod (2), a high-strength pressure box (3), a strain gauge (4), a strain gauge sensing line (6), a pressure box positioning clamp (7), an overhanging hydrolysis bracket (8), a connecting steel bar protrusion (9) and a hydrolysis box (10); the pressure box positioning clamp (7) fixes the high-strength pressure box (3) above the sensitive grid (5) in the strain gauge (4), the strain gauge (4) is pasted on the flexible attachment rod (2), the hydrolysis box (10) is fixed on the steel bar through the tail end connecting steel bar bulges (9) of the peripheral hydrolysis support (8), and the hydrolysis box (10) is kept horizontal; one end of the high-strength pressure box sensing wire (1) is arranged in the high-strength pressure box (3), and the other end of the high-strength pressure box sensing wire extends out of the high-strength pressure box (3); the strain gauge sensing wire (6) is used for connecting each strain gauge (4). The strain gauge sensing wire (6) at the terminal of the sensitive grid (5) is led out of the hydrolysis box (10) and is exposed to a sufficient length to be connected with a data acquisition instrument. A plurality of flexible stick (2) fixed mounting are constituteed stick flower (11) inside hydrolysis box (10), and stick flower (11) are become by horizontal plane flexible stick and the flexible stick that adheres to of vertical plane, and resistance-type foil gage pastes on some flexible stick (2) that adhere to.
Furthermore, the baseball flower (11) and the hydrolysis box (10) are bound together by binding wires, the baseball flower (11) and the hydrolysis box (10) are main working systems, and the basic principle is that the baseball flower (11) and the hydrolysis box (10) are utilized to monitor the stress strain inside the reinforced concrete member respectively.
Furthermore, the included angle between each flexible attachment rod (2) in the horizontal flexible attachment rods is 0 degree, 90 degrees and 45 degrees, the forming form is not unique, and after the strain on each flexible attachment rod (2) is measured, the strain in any direction of the plane is calculated through the strain data of each flexible attachment rod (2) of the horizontal flexible attachment rods. The flexible attachment rod (2) in the flexible attachment rod of perpendicular to arbitrary horizontal plane of the flexible attachment rod of perpendicular face, each flexible attachment rod (2) in the flexible attachment rod of perpendicular face connect in order to can form the flower that meets an emergency with flexible attachment rod (2) in the flexible attachment rod of arbitrary horizontal plane, measure and measure the value of strain by resistance-type strain measurement, calculate the value of strain of vertical face each direction. The strain value of any point in space can be calculated by the multi-dimensional attached strain flower.
Furthermore, the bar flower (11) is fixed in the hydrolysis box (10), and when the bar flower is used for monitoring the multidimensional stress strain in the shear wall, the tail end of the overhanging hydrolysis support (8) outside the hydrolysis box (10) is connected with the reinforcing steel bar protrusion (9) and the shear wall longitudinal bar (12) and bound through binding wires; when the device is used for monitoring multidimensional stress strain in the reinforced concrete column, the tail end of the overhanging hydrolysis bracket (8) outside the hydrolysis box (10) is connected with a reinforcing steel bar protrusion (9) and a longitudinal bar (15) of the reinforced concrete column through binding wires; when the device is used for monitoring multidimensional stress strain in the reinforced concrete beam, the tail end of the overhanging hydrolysis bracket (8) outside the hydrolysis box (10) is connected with the reinforced bar protrusion (9) and the reinforced concrete beam stirrup (18) through binding wires.
Further, the flexible attachment rods (2) are arranged in three or more planes, and one or more flexible attachment rods are vertically arranged. The surface hardness of the flexible attachment rod (2) is low, the surface is rough after polishing, and the strain gauge (4) is firmly bonded with the flexible attachment rod (2). The length of the flexible attachment rod is the same as the height of the hydrolysis box (10), the cross section area is not more than 1/50 on the upper surface of the soil pressure box, the compression strength range is 150Mpa-200Mpa, and the bending strength range is 40-100 Mpa. As a medium between the concrete and the strain gauge (4), the measurement precision of the strain gauge is not influenced. The flexible attachment rod (2) is firmly bound with the hydrolysis box by a binding wire. The flexible attaching rod (2) is made of polymethyl methacrylate, bamboo chips or cork, and is not limited to a certain material.
Furthermore, a high-strength pressure box (3) is fixed on the flexible attachment rod (2) through a pressure box positioning clamp (7), the arrangement position of the high-strength pressure box (3) is the same as that of the flexible attachment rod (2), when the internal stress of the concrete test block changes, the soil pressure box synchronously senses the change of the stress, the internal stress of the reinforced concrete member is obtained through a vibrating string test principle, any point in a strain value calculation space measured by the same multidimensional attachment type strain pattern is the same in strain principle, and the stress value of any point in the space can be calculated through the stress measured by the high-strength pressure box.
Furthermore, the size of the strain gauge (4) is smaller than the surface size of the flexible attachment rod, the sensitive grid (5) is ensured to be in the middle position in the pasting process, the surface of the sensitive grid (5) faces to the concrete pouring surface, and after the strain gauge (4) is pasted by the instant strong adhesive, the surface of the strain gauge is coated with silicon rubber for moisture-proof treatment, so that the moisture in the concrete is prevented from entering to influence the measurement accuracy of the strain gauge. And the leading-out end of the strain gauge sensing wire (6) is coated with organic silicon adhesive glue for heat insulation treatment, so that the strain gauge sensing wire (6) is prevented from being damaged by heat emitted in the hydration process of concrete.
Furthermore, the hydrolysis box (10) has high surface hardness, can bear the impact force of the concrete pouring process, is not damaged, and is very easy to dissolve in water. The size does not exceed 1/200 of the reinforced concrete test piece. The hydrolysis box (10) can generate slight chemical reaction when meeting water and then dissolve, the concrete contains a large amount of moisture, but the hydrolysis box (10) is completely hydrolyzed after the concrete is initially set. The upper surface and the lower surface of the hydrolysis box (10) are parallel to each other, and flexible attachment rods (2) are arranged, and when concrete is poured, gaps on the upper surface and the lower surface of the hydrolysis box penetrate through the gaps and are filled with the hydrolysis box. The hydrolysis bracket (8) extends out of the periphery of the hydrolysis box (10), and the hydrolysis bracket is made of a material similar to that of the hydrolysis box. The tail end of the hydrolysis support (8) is connected with a connecting steel bar protrusion (9), and the connecting steel bar protrusion (9) has different diameters, so that the connecting steel bar protrusion is connected with steel bars of different types, and the position of the hydrolysis box (10) is fixed. The material of the hydrolysis box (10) can be high-carbon sodium fatty acid (soap) with the density of more than 5g/cm3, and high-density polyethylene glycol, and is not limited to a certain material.
Furthermore, the impact strength of the connecting reinforcing steel bar bulge (9) is more than 30J/m2Strength greater than 30N/m2The tail end of the hydrolysis support (8) protrudes from top to bottom to form a connecting steel bar protrusion (10), and the connecting steel bar protrusion (9) is bound with different types of steel bars, such as a shear wall longitudinal bar, a reinforced concrete beam stirrup and a reinforced concrete beam longitudinal bar. The connecting reinforcing steel bar protrusion (9) is firmly bound with the reinforcing steel bar to ensure that the hydrolysis box (10) is buried at a preset position.
Furthermore, the pressure box positioning clamp (7) is made of steel and extends out of two sides of the flexible attachment rod (2), and the pressure box positioning clamp (7) clamps the high-strength pressure box (3). The height of the positioning card is about the radius of the high-strength pressure box (3), the strength is high, the positioning is convenient and fast, and the measurement accuracy of the high-strength pressure box is not influenced.
Further, the specific implementation steps are as follows:
s1, placing a device for monitoring multi-dimensional stress strain in the reinforced concrete member in the reinforced concrete beam, wherein the size of the manufacturing device does not exceed the beam section 1/200, selecting flexible attachment rods with proper length to manufacture multi-dimensional strain patterns, and increasing vertical flexible attachment rods on the basis that the plane angles are 0 degree, 90 degrees and 150 degrees respectively.
S2, pasting a strain gauge on the flexible medium rod, placing the high-strength pressure box on the positioning card after pasting, firmly connecting the flexible medium rod with the hydrolysis box by using a binding wire, and paying attention to the fact that the flexible medium rod keeps horizontal.
And S3, after the reinforced concrete beam stirrups are firmly bound, binding the connecting steel bar protrusions and the reinforced concrete beam stirrups together, wherein the connecting steel bar protrusions are located on the left and right sides of the beam span, the hydrolysis box keeps horizontal and is not inclined, and concrete is poured.
S4, after the concrete is poured, the water in the concrete slightly reacts with the hydrolysis box, the hydrolysis box starts to dissolve, and after the concrete is initially set, the hydrolysis box and the hydrolysis box external support are completely dissolved. The stress-strain rosette is fixed in the reinforced concrete beam, and the position of the stress-strain rosette is not changed.
And S5, the high-strength pressure box and the strain gauge sensing wire extend out of the reinforced concrete beam and are connected with a data acquisition instrument, so that the stress-strain value of the reinforced concrete beam in the actual engineering environment can be monitored, and real data are provided for the structural theory research.
Compared with the existing sensor for monitoring internal stress and strain, the invention has the following advantages:
1. the device for monitoring the multi-dimensional stress strain in the reinforced concrete member and the mounting method directly measure the stress strain in the reinforced concrete test piece, and have the advantages of wide measurement range, high precision and low cost.
2. According to the device and the installation method for monitoring the multidimensional stress strain in the reinforced concrete member, the stress of the reinforced concrete test piece is directly measured without converting the stress-strain relation of materials into stress.
3. The device for monitoring the multidimensional stress strain in the reinforced concrete member and the mounting method thereof have the advantages that the fixing method is simple and feasible, and the operation state of the reinforced concrete member is monitored and evaluated.
4. According to the device and the installation method for monitoring the multidimensional stress strain in the reinforced concrete member, the design load working condition parameters are verified according to the analysis result of the monitoring data, and the stress mechanism of the structure is deeply discussed and researched.
5. According to the device and the installation method for monitoring the multidimensional stress strain in the reinforced concrete member, disclosed by the invention, long-term continuous actual measurement test data are provided for the structural theory research by monitoring the stress change in the reinforced concrete member in real time.
Drawings
FIG. 1 is a front view of a hydrolysis tank for monitoring multidimensional stress strain in a reinforced concrete member and a mounting method thereof.
FIG. 2 is a three-dimensional view of a hydrolysis tank for monitoring multi-dimensional stress strain in a reinforced concrete member and a mounting method thereof.
FIG. 3 is a three-dimensional graph of stress-strain patterns of the device for monitoring multi-dimensional stress-strain in a reinforced concrete member and the installation method of the device.
FIG. 4 is a front view of a stress-strain diagram of the device for monitoring multidimensional stress strain in a reinforced concrete member and the installation method of the device.
FIG. 5 is a three-dimensional view of the shear wall installation of the device and the method for monitoring multi-dimensional stress strain in the reinforced concrete member of the present invention.
FIG. 6 is a front view of the shear wall installation of the device and the method for monitoring multi-dimensional stress strain in the reinforced concrete member of the present invention.
Fig. 7 is a three-dimensional view of the reinforced concrete column installation of the device and the installation method for monitoring multidimensional stress strain in the reinforced concrete member of the invention.
Fig. 8 is a front view of the reinforced concrete column installation of the device and the installation method for monitoring multidimensional stress strain in the reinforced concrete member of the invention.
Fig. 9 is a three-dimensional view of the reinforced concrete beam installation of the device and the installation method for monitoring multi-dimensional stress strain in the reinforced concrete member of the present invention.
Fig. 10 is a front view of the reinforced concrete beam mounting according to the device and the mounting method for monitoring multidimensional stress strain in the reinforced concrete member of the invention.
In the figure: 1. high-strength pressure cell sensing wire, 2, flexible adhesion bar, 3, high-strength pressure cell, 4, foil gage, 5, sensitive bars, 6, foil gage sensing wire, 7, pressure cell locator card, 8, overhanging hydrolysis bracket, 9, connecting reinforcement protruding, 10, hydrolysis box, 11, bar flower, 12, shear wall longitudinal reinforcement, 13, shear wall horizontal reinforcement, 14, reinforced concrete column stirrup, 15, reinforced concrete column longitudinal reinforcement, 16, reinforced concrete beam longitudinal reinforcement, 17, reinforced concrete beam waist reinforcement, 18, reinforced concrete beam stirrup.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the drawings in the implementation of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments.
The device needs to be fixed when the reinforcing steel bars are bound, and the operation is simple; the excellent flower (11) and the high-strength pressure box (3) are working systems of the device. The stick flower (11) is composed of a plurality of vertical flexible attachment sticks (2) which are arranged in a plane; the high-strength pressure box (3) is fixed above the flexible attachment rod (2). The size of the strain gauge (4) is smaller than the surface size of the flexible attachment rod (2); the surface of the flexible attachment rod (5) is roughened by grinding, so that the flexible attachment rod (5) and the concrete are kept to be tightly bonded. The strain gauge (4) is adhered to the flexible attachment rod (2) by using an instant strong adhesive, and the surface of the strain gauge (4) is coated with silicon rubber for damp-proof treatment, so that the phenomenon that the adhesive layer absorbs moisture in concrete to reduce the insulation resistance value is avoided. The high-strength pressure box (3) is fixed above the position of the sensitive grid (5), and a gap is reserved between the high-strength pressure box and the sensitive grid (5), so that the precision is prevented from being influenced. So that the sensor measures the stress and the strain of the reinforced concrete test piece at the same position. The hydrolysis box (10) is filled in the concrete in the pouring process, and the strain gauge (4) and the high-strength pressure box (3) are in contact with the concrete. After concrete pouring is finished, the hydrolysis box (10) and water in the concrete are subjected to physical reaction, and after the concrete is initially set, the hydrolysis box (10) is completely dissolved. Cement is coated on the surface of the high-strength pressure box (3) to increase the surface roughness of the pressure box. The leading-out parts of the high-strength pressure box and the strain gauge sensing wire are coated with organic silicon bonding glue for water and heat insulation, so that the sensing wire is prevented from being damaged by heat release in the hydration process of concrete. The high-strength pressure cell sensing line (1) and the strain gauge sensing line (6) should ensure enough length.
Three or more flexible attachment rods (2) are arranged in a plane, and one or more flexible attachment rods are vertically arranged to form a rod flower (11). The surface hardness of the flexible attachment rod (2) is low, the surface is rough after polishing, and the strain gauge (4) is firmly bonded with the flexible attachment rod (2). The length of the flexible attachment rod (11) is the same as the height of the hydrolysis box (10), the cross-sectional area is not more than 1/50 on the upper surface of the soil pressure box, the compression strength range is 150Mpa-200Mpa, and the bending strength range is 60-100 Mpa. As a medium between the concrete and the strain gauge (4), the measurement precision of the strain gauge is not influenced. The flexible attachment rod (2) is firmly bound with the hydrolysis box by a binding wire. The flexible adhesive rod (2) can be made of polymethyl methacrylate, bamboo chips and cork, but is not limited to a certain material.
According to the invention, a high-strength pressure box (3) is fixed on a flexible attachment rod (2) through a pressure box positioning clamp (7), the arrangement position of the high-strength pressure box (3) is the same as that of the flexible attachment rod (2), when the internal stress of a concrete test block changes, the soil pressure box synchronously senses the change of the stress, a high-strength pressure box induction plate deforms, the internal stress of a reinforced concrete member is obtained through a vibrating string test principle, any point in a strain value calculation space measured by the same multidimensional attachment type strain rosette is the same in strain principle, and the stress value of any point in the space can be calculated through the stress measured by the high-strength pressure box.
The size of the strain gauge (4) is smaller than the surface size of the flexible attachment rod, the rod flower (11) is formed, the sensitive grid (5) is ensured to be in the middle position in the pasting process, the strain gauge sensing wire (6) at the terminal is led out of the hydrolysis box (10), and the strain gauge sensing wire is exposed to be long enough and connected with a data acquisition instrument. The sensitive grid (5) faces the concrete pouring surface, the surface of the strain gauge (4) is coated with silicon rubber for moisture-proof treatment after being adhered by an instant strong adhesive, and the influence of moisture in concrete on the measurement accuracy of the strain gauge is avoided. And the leading-out end of the strain gauge sensing wire (6) is coated with organic silicon adhesive glue for heat insulation treatment, so that the strain gauge sensing wire (6) is prevented from being damaged by heat emitted in the hydration process of concrete.
The hydrolysis box (10) has high surface hardness, can bear the impact force in the concrete pouring process, is not damaged, and is very easy to dissolve in water. About 1/200 for a reinforced concrete specimen. The hydrolysis box (10) can generate slight chemical reaction when meeting water and then dissolve, the concrete contains a large amount of moisture, but the hydrolysis box (10) is completely hydrolyzed after the concrete is initially set. The upper surface and the lower surface of the hydrolysis box (10) are parallel to each other, and flexible attachment rods (2) are arranged, and when concrete is poured, gaps on the upper surface and the lower surface of the hydrolysis box penetrate through the gaps and are filled with the hydrolysis box. The periphery of the hydrolysis box (10) extends out of the overhanging hydrolysis bracket (8), and the overhanging hydrolysis bracket is made of a material similar to that of the hydrolysis box. The upper and lower protruding reinforcing bar connection end at the end of the overhanging hydrolysis bracket (8), the connection reinforcing bar protrusion (9) has different diameters, so that the connection reinforcing bar protrusion can be bound with reinforcing bars of different models, thereby fixing the position of the hydrolysis box (10).
The material of the hydrolysis box (10) can be selected to have a density of more than 5g/cm3The higher fatty acids, high density polyethylene glycols, are not limited to a certain material.
The impact strength of the connecting reinforcing steel bar bulge (9) is more than 30J/m2Strength greater than 30N/m2The tail end of the overhung hydrolysis support (8) protrudes out of the connecting steel bar protrusion (10) up and down, and the connecting steel bar protrusion (9) is bound with different types of steel bars, such as a shear wall longitudinal bar, a reinforced concrete beam stirrup and a reinforced concrete beam longitudinal bar. The connecting reinforcing steel bar protrusion (9) is used for connecting reinforcing steel bars to ensure that the hydrolysis box (10) is buried at a preset position.
The pressure box positioning clamp (7) is made of steel and extends out of two sides of the flexible attachment rod (2), and the pressure box positioning clamp (7) clamps the high-strength pressure box (3). The height of the positioning card is about the radius of the high-strength pressure box (3), the strength is high, the positioning is convenient and fast, and the measurement accuracy of the high-strength pressure box is not influenced.
The implementation steps are as follows:
1. the device for monitoring multidimensional stress strain in the reinforced concrete member is placed in the reinforced concrete beam, the size of the manufacturing device is not larger than the beam section 1/200, the flexible attachment rods with proper length are selected to manufacture multidimensional strain patterns, the plane angles are 0 degree, 90 degrees and 150 degrees respectively, and the vertical flexible attachment rods are added on the basis.
2. The flexible medium rod is adhered with a strain gauge, the high-strength pressure box is placed on the positioning clamp after the strain gauge is adhered, the flexible medium rod and the hydrolysis box are firmly connected by the binding wire, and the flexible medium rod is kept horizontal.
3. After the reinforced concrete beam stirrups are firmly bound, the connecting steel bar protrusions and the reinforced concrete beam stirrups are bound together, the connecting steel bar protrusions and the reinforced concrete beam stirrups are located on the left and right sides of the beam span, the hydrolysis box keeps horizontal and does not incline, and concrete can be poured.
4. After concrete is poured, water in the concrete slightly reacts with the hydrolysis box, the hydrolysis box starts to dissolve, and after the concrete is initially set, the hydrolysis box and the hydrolysis box external support are completely dissolved. The stress-strain rosette is fixed in the reinforced concrete beam, and the position of the stress-strain rosette is not changed.
5. The high-strength pressure box and the strain gauge sensing wire extend out of the reinforced concrete beam and are connected with the data acquisition instrument, so that the stress-strain value of the reinforced concrete beam in the actual engineering environment can be monitored, and real data are provided for the structural theory research.
Claims (10)
1. The utility model provides a device that inside multidimension stress strain of monitoring reinforced concrete member which characterized in that: the pressure box positioning clamp (7) fixes the high-strength pressure box (3) above the sensitive grid (5) in the strain gauge (4), the strain gauge (4) is pasted on the flexible attachment rod (2), the hydrolysis box (10) is fixed on the steel bar through the tail end connecting steel bar bulges (9) of the peripheral hydrolysis support (8), and the hydrolysis box (10) is kept horizontal; one end of the high-strength pressure box sensing wire (1) is arranged in the high-strength pressure box (3), and the other end of the high-strength pressure box sensing wire extends out of the high-strength pressure box (3); the strain gauge sensing wire (6) is used for connecting each strain gauge (4); a strain gauge sensing wire (6) at the terminal of the sensitive grid (5) is led out of the hydrolysis box (10) and is exposed for a sufficient length to be connected with a data acquisition instrument; a plurality of flexible stick (2) fixed mounting are constituteed stick flower (11) inside hydrolysis box (10), and stick flower (11) are become by horizontal plane flexible stick and the flexible stick that adheres to of vertical plane, and resistance-type foil gage pastes on some flexible stick (2) that adhere to.
2. The device for monitoring multidimensional stress strain inside a reinforced concrete member according to claim 1, wherein: the bar flower (11) and the hydrolysis box (10) are bound together by binding wires, and the bar flower (11) and the hydrolysis box (10) are used for monitoring the stress strain in the reinforced concrete member respectively.
3. The device for monitoring multidimensional stress strain inside a reinforced concrete member according to claim 1, wherein: the included angle between each flexible attachment rod (2) in the horizontal flexible attachment rods is 0 degree, 90 degrees or 45 degrees, after the strain on each flexible attachment rod (2) is measured, the strain in any direction of the plane is calculated through the strain data of each flexible attachment rod (2) of the horizontal flexible attachment rods.
4. The device for monitoring multidimensional stress strain inside a reinforced concrete member according to claim 1, wherein: when the device is used for monitoring the multi-dimensional stress strain inside the shear wall, the tail end of the overhanging hydrolysis bracket (8) outside the hydrolysis box (10) is connected with the reinforcing steel bar protrusion (9) and the shear wall longitudinal bar (12) through binding wires; when the device is used for monitoring multidimensional stress strain in the reinforced concrete column, the tail end of the overhanging hydrolysis bracket (8) outside the hydrolysis box (10) is connected with a reinforcing steel bar protrusion (9) and a longitudinal bar (15) of the reinforced concrete column through binding wires; when the device is used for monitoring multidimensional stress strain in the reinforced concrete beam, the tail end of the overhanging hydrolysis bracket (8) outside the hydrolysis box (10) is connected with the reinforced bar protrusion (9) and the reinforced concrete beam stirrup (18) through binding wires.
5. The device for monitoring multidimensional stress strain inside a reinforced concrete member according to claim 1, wherein: three or more flexible attachment rods (2) are arranged in a plane, and one or more flexible attachment rods are vertically arranged; the surface hardness of the flexible attachment rod (2) is low, the surface is rough after polishing, and the strain gauge (4) is firmly bonded with the flexible attachment rod (2); the length of the flexible attachment rod is the same as the height of the hydrolysis box (10), and the cross-sectional area is not larger than 1/50 on the upper surface of the soil pressure box.
6. The device for monitoring multidimensional stress strain inside a reinforced concrete member according to claim 1, wherein: the flexible attaching rod (2) is made of polymethyl methacrylate, bamboo chips or cork, and is not limited to a certain material.
7. The device for monitoring multidimensional stress strain inside a reinforced concrete member according to claim 1, wherein: the size of the strain gauge (4) is smaller than that of the surface of the flexible attachment rod, the sensitive grid (5) is ensured to be in the middle position in the pasting process, the surface of the sensitive grid (5) faces to a concrete pouring surface, and after the strain gauge (4) is pasted by using an instant strong adhesive, the surface is coated with silicon rubber for damp-proof treatment; and the leading-out end of the strain gauge sensing wire (6) is coated with organic silicon adhesive glue for heat insulation treatment, so that the strain gauge sensing wire (6) is prevented from being damaged by heat emitted in the hydration process of concrete.
8. The device for monitoring multidimensional stress strain inside a reinforced concrete member according to claim 1, wherein: the upper surface and the lower surface of the hydrolysis box (10) are parallel to each other, and flexible attachment rods (2) are arranged, and when concrete is poured, gaps on the upper surface and the lower surface of the hydrolysis box penetrate through the gaps and are filled with the hydrolysis box.
9. The device for monitoring multidimensional stress strain inside a reinforced concrete member according to claim 1, wherein: the pressure box positioning clamp (7) is made of steel and extends out of two sides of the flexible attachment rod (2), and the pressure box positioning clamp (7) clamps the high-strength pressure box (3); the height of the positioning card is about the radius of the high-strength pressure box (3), the strength is high, the positioning is convenient and fast, and the measurement accuracy of the high-strength pressure box is not influenced.
10. A method for monitoring multidimensional stress-strain inside a reinforced concrete member by using the device of any of claims 1 to 9, characterized in that: the method comprises the following concrete implementation steps:
s1, placing a device for monitoring multi-dimensional stress strain in the reinforced concrete member in the reinforced concrete beam, wherein the size of the manufacturing device does not exceed the beam section 1/200, and manufacturing a multi-dimensional strain pattern by using a flexible attachment rod;
s2, adhering a strain gauge to the flexible medium rod, placing the high-strength pressure box on the positioning card after adhering, and firmly connecting the flexible medium rod with the hydrolysis box by using a binding wire, wherein the flexible medium rod is kept horizontal;
s3, after the reinforced concrete beam stirrups are firmly bound, the connecting steel bar protrusions and the reinforced concrete beam stirrups are bound together, the connecting steel bar protrusions are located on the left and right of the middle of a beam span, the hydrolysis box is kept horizontal and not inclined, and concrete is poured;
s4, after the concrete is poured, the water in the concrete slightly reacts with the hydrolysis box, the hydrolysis box starts to dissolve, and after the concrete is initially set, the hydrolysis box and the hydrolysis box external support are completely dissolved; the stress-strain rosette is fixed in the reinforced concrete beam, and the position of the stress-strain rosette is not changed;
and S5, the high-strength pressure box and the strain gauge sensing wire extend out of the reinforced concrete beam and are connected with a data acquisition instrument, so that the stress-strain value of the reinforced concrete beam in the actual engineering environment can be monitored, and real data are provided for the structural theory research.
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