CN111929201A - Device and method for measuring on-site demoulding strength of slip form concrete - Google Patents
Device and method for measuring on-site demoulding strength of slip form concrete Download PDFInfo
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- CN111929201A CN111929201A CN202010968131.4A CN202010968131A CN111929201A CN 111929201 A CN111929201 A CN 111929201A CN 202010968131 A CN202010968131 A CN 202010968131A CN 111929201 A CN111929201 A CN 111929201A
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- G01N11/00—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties
- G01N11/10—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by moving a body within the material
- G01N11/12—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by moving a body within the material by measuring rising or falling speed of the body; by measuring penetration of wedged gauges
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Abstract
The invention discloses a device and a method for measuring the on-site demoulding strength of slip form concrete, wherein the measuring device comprises a shell, a displacement sensor and a vertical centering base, a control device, a power supply device, a pressure sensor and a buzzer are arranged in the shell, the power supply device is used for supplying power to the measuring device, one end of a distance measuring rod is connected with the buzzer inside the shell, the other end of the distance measuring rod extends out of the shell and is connected with the displacement sensor, a measuring needle and the displacement sensor are arranged at the same end of the shell, a digital display screen and a control panel are arranged on the shell, a measuring needle hole matched with the measuring needle is arranged in the center of the vertical centering base, at least two base support arms are also arranged on the vertical centering base, and. The method comprises two steps of sample preparation and field measurement. The device is used for measuring the actual demolding strength of the slip-form concrete site, and is combined with a mortar comparison measuring method, so that the demolding time is further accurate, errors can be greatly reduced, and the construction quality and safety are improved.
Description
Technical Field
The invention relates to a measuring device and a measuring method, in particular to a device and a method for measuring the on-site demoulding strength of slip form concrete.
Background
The concrete poured by the sliding template is a common concrete construction process and is mainly used for vertical shafts, pier walls, concrete panels, inclined shafts and other parts of hydropower engineering and hydraulic engineering. In the concrete pouring construction process of the sliding template, the demolding strength of the concrete needs to be determined when the sliding template is lifted. When the demoulding strength of the sliding formwork concrete is lower, the concrete is easy to collapse; when the demolding strength of the concrete is too high, the sliding template is difficult to lift, and the concrete is cracked. The demoulding strength of the slip-form concrete is too low or too high, and quality accidents and safety accidents are easy to occur.
In the prior art, mortar is screened to measure the injection resistance, a relation curve graph of time and the injection resistance is drawn, according to the demolding strength required by different occasions (such as vertical shafts, pier walls, concrete panels and inclined shafts of hydraulic engineering), the corresponding time is found on the curve graph to be the demolding time, and during field construction, demolding can be carried out as long as the concrete reaches the demolding time.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a portable device and a method for measuring the on-site demoulding strength of slip-form concrete, which can measure the demoulding strength on site, reduce errors and improve the construction quality and safety.
The purpose of the invention is realized by the following technical scheme:
the device for measuring the on-site demoulding strength of the slip form concrete comprises a shell, a displacement sensor and a vertical centering base, wherein a control device, a power supply device, a pressure sensor and a buzzer are arranged in the shell, the power supply device is used for supplying power to the measuring device, a distance measuring rod is arranged on the shell, one end of the distance measuring rod is connected with the buzzer inside the shell, the other end of the distance measuring rod extends out of the shell and is connected with the displacement sensor, the displacement sensor and the buzzer are electrically connected with the control device, a measuring needle which is connected with the pressure sensor in a matching way is also arranged on the shell, the measuring needle and the displacement sensor are arranged at the same end of the shell, the pressure sensor is electrically connected with the control device, a digital display screen and a control panel are arranged on the shell, the digital display screen and the control panel are electrically connected with the control device, a, at least two base support arms are further arranged on the vertical centering base, and support arm holes matched with the base support arms are formed in the shell.
Preferably, the power supply device comprises a power supply battery, and a charging interface for charging the power supply battery is arranged on the shell.
Preferably, the measuring pin is detachably connected with the shell through a fastening bolt.
Preferably, the control device comprises an integrated circuit board, and the housing is provided with a data transmission interface electrically connected with the integrated circuit board.
Preferably, the shell is provided with an operating handle.
The measuring method of the measuring device comprises the following steps:
the method comprises the following steps: preparing a sample;
step two: measuring on site;
wherein, step one includes the following substeps:
step S1: mixing a concrete sample according to construction requirements, uniformly dividing the sample into two parts, and respectively recording the two parts as a first sample and a second sample, wherein the first sample is used for measuring mortar penetration resistance, and the second sample is used for measuring concrete penetration resistance;
step S2: taking a first test sample, screening mortar by adopting a standard screen with the aperture of a screen hole being 5mm, filling the screened mortar into a test mold, inserting and tamping the mortar to be compact, then measuring the injection resistance of the mortar at different times, and drawing a relation curve graph of the time and the injection resistance;
step S3: taking a second sample, filling the second sample into a test mold, inserting and tamping the second sample to be compact, standing the second sample for 1 to 2 hours, and then smoothing the surface of the second sample along a mold opening;
step S4: inputting one penetration resistance value measured in the step S2 into the control device through the control panel according to the relation curve graph of time and penetration resistance drawn in the step S2, placing the vertical centering base on the two surfaces of the sample after being leveled, aligning the support arm hole of the measuring device with the support arm of the base, inserting the measuring device, slowly pressing the measuring device downwards, when the measuring needle passes through the measuring needle hole and contacts with the two surfaces of the sample, sounding the buzzer, recording the displacement value at the moment as a 0-bit value by the control device, continuously pressing the measuring device downwards to enable the measuring needle to penetrate into the second sample, when the value measured by the pressure sensor is the same as the input penetration resistance value, sounding the buzzer, stopping the pressing at the moment, and recording the displacement value of the displacement sensor at the moment by the control device;
step S5: repeating the step S4 until all penetration resistance values measured in the step S2 are measured;
step S6: drawing a graph of the relationship between displacement and penetration resistance according to the measurement result in the step S5, and drawing a graph of the relationship between time and penetration resistance;
the second step comprises the following substeps:
step S7: finding out the displacement value corresponding to the required demoulding strength according to the relation curve chart of the displacement and the penetration resistance drawn in the step S6, inputting the displacement value corresponding to the required demoulding strength into the control device through the control panel, placing the vertical centering base on the surface of the concrete to be measured on site, aligning the support arm hole of the measuring device with the support arm of the base, inserting the measuring device, and slowly pressing the measuring device downwards, when the measuring pin passes through the measuring pin hole and contacts with the surface of the concrete to be measured, the buzzer sounds, the control device records the displacement value as a '0' value, the measuring device is continuously pressed down to enable the measuring pin to penetrate, when the value measured by the displacement sensor is the same as the input displacement value, the buzzer sends out buzzing sound, the pressing-down action is stopped at the moment, and the control device records the penetration resistance value measured by the pressure sensor at the moment, namely the final measured value of the on-site demoulding strength.
Preferably, step S2 is performed simultaneously with step S3.
Preferably, in step S7, 16 measuring points are selected for the concrete to be measured on site, 3 minimum values and 3 maximum values of the final measurement result are removed, and the arithmetic average of the remaining 10 measurement results is taken as the final measurement result.
Preferably, the time corresponding to the required penetration resistance is found according to the graph of the relationship between the time and the penetration resistance plotted in step S6, and the final measured value of the mold release strength measured in step S7 is compared with the required mold release strength value, if the final measured value is smaller, the mold release time of the slip film is prolonged, and if the final measured value is larger, the mold release time of the slip film is shortened.
The invention has the beneficial effects that:
(1) compared with the existing large-scale penetration resistance measuring instrument, the measuring device is lighter, smaller, portable, simple to operate and greatly convenient for field operation.
(2) The vertical centering base is arranged and placed on the surface to be measured, the vertical centering base is parallel to the surface to be measured, and the base support arm is matched with the support arm hole, so that the shell is perpendicular to the vertical centering base, namely the measuring pin is perpendicular to the surface to be measured, and the measuring accuracy is guaranteed.
(3) The control device can display the measured data on a digital display screen in real time by matching with the pressure sensor and the displacement sensor, and the buzzer alarms when the injection resistance or the displacement is measured to reach an input value, so that the accuracy of the measured data is ensured.
(4) The method is a mature method in the prior art for determining the demolding time by measuring the demolding strength of screened mortar, the device is used for measuring the actual demolding strength of the synovial concrete site, and the method is combined with a comparative mortar measurement method, so that the demolding time is further accurate, errors can be greatly reduced, and the construction quality and safety are improved.
Drawings
FIG. 1 is a schematic view of the internal structure of the present invention;
FIG. 2 is a schematic view of the external structure of the present invention;
FIG. 3 is a schematic view of a vertical centering base structure;
FIG. 4 is a schematic view of the mating structure of the housing and the vertical centering base;
in the figure, 1-a shell, 2-a power supply battery, 3-an operating handle, 4-a charging interface, 5-a data transmission interface, 6-a buzzer, 7-a fastening bolt, 8-a measuring pin, 9-a displacement sensor, 10-a distance measuring rod, 11-an integrated circuit board, 12-a digital display screen, 13-a control panel, 14-a vertical centering base, 15-a base supporting arm, 16-a measuring pin hole and 17-a supporting arm hole.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.
Referring to fig. 1-4, the present invention provides a technical solution:
the on-site demoulding strength measuring device for the slip form concrete comprises a shell 1, a displacement sensor 9 and a vertical centering base 14, wherein a control device, a power supply device, a pressure sensor and a buzzer 6 are arranged in the shell 1, the power supply device is used for supplying power to the measuring device, a distance measuring rod 10 is arranged on the shell 1, one end of the distance measuring rod 10 is connected with the buzzer 6 inside the shell 1, the other end of the distance measuring rod extends out of the shell 1 and is connected with the displacement sensor 9, the displacement sensor 9 and the buzzer 6 are both electrically connected with the control device, a measuring needle 8 which is connected with the pressure sensor in a matching way is also arranged on the shell 1, the measuring needle 8 and the displacement sensor 9 are arranged at the same end of the shell 1, the pressure sensor is electrically connected with the control device, a digital display screen 12 and a control panel 13 are arranged on the shell 1, the digital display, the center of the vertical centering base 14 is provided with a pin measuring hole 16 matched with the pin measuring 8, the vertical centering base 14 is also provided with at least two base support arms 15, and the shell 1 is provided with support arm holes 17 matched with the base support arms 15. During measurement, the vertical centering base 14 is placed on the surface of concrete, the vertical centering base 14 is parallel to the surface of the concrete, and the base support arm 15 is matched with the support arm hole 17, so that the shell 1 is perpendicular to the vertical centering base 14, namely the measuring pin 8 is perpendicular to the surface of the concrete to be measured, and the measurement precision is ensured.
Furthermore, power supply unit include power supply battery 2, be equipped with the interface 4 that charges for power supply battery 2 charges on the shell 1, need not connect the power cord when using after charging, convenient operation.
Furthermore, the measuring pin 8 can be dismantled with the shell 1 through fastening bolt 7 and be connected, conveniently change different measuring pins 8, also conveniently take off measuring pin 8 when not using, practice thrift the space, prevent that measuring pin 8 from colliding and damaging.
Furthermore, the control device comprises an integrated circuit board 11, and a data transmission interface 5 electrically connected with the integrated circuit board 11 is arranged on the housing 1.
Furthermore, the shell 1 is provided with an operating handle 3, so that the hand-held operation is facilitated.
The measuring method for measuring the on-site demolding strength by using the measuring device comprises the following steps of:
the method comprises the following steps: preparing a sample;
step two: and (4) field measurement.
Wherein, step one includes the following substeps:
step S1: mixing a concrete sample according to construction requirements, uniformly dividing the sample into two parts, and respectively recording the two parts as a first sample and a second sample, wherein the first sample is used for measuring mortar penetration resistance, and the second sample is used for measuring concrete penetration resistance;
step S2: taking a first test sample, screening mortar by adopting a standard screen with the aperture of a screen hole being 5mm, filling the screened mortar into a test mold, inserting and tamping the mortar to be compact, then measuring the injection resistance of the mortar at different times, and drawing a relation curve graph of the time and the injection resistance;
step S3: taking a second sample, filling the second sample into a test mold, inserting and tamping the second sample to be compact, standing the second sample for 1 to 2 hours, and then smoothing the surface of the second sample along a mold opening;
step S4: inputting one penetration resistance value measured in the step S2 into the control device through the control panel 13 according to the relation curve graph of time and penetration resistance drawn in the step S2, placing the vertical centering base 14 on the two surfaces of the leveled sample, aligning the support arm hole 17 of the measurement device with the support arm 15 of the base, inserting the measurement device, slowly pressing down the measurement device, when the measuring needle 8 passes through the measuring needle hole 16 to be in contact with the two surfaces of the sample, sounding the buzzer 6, recording the displacement value at the moment as a '0' value by the control device, continuing pressing down the measurement device to enable the measuring needle 8 to penetrate into the second sample, when the value measured by the pressure sensor is the same as the input penetration resistance value, sounding the buzzer 6, stopping the pressing down at the moment, and recording the displacement value of the displacement sensor 9 by the control device;
step S5: repeating the step S4 until all penetration resistance values measured in the step S2 are measured;
step S6: and drawing a relation curve graph of displacement and penetration resistance according to the measurement result in the step S5, drawing a relation curve graph of time and penetration resistance, wherein the time corresponding to the demolding strength (penetration resistance) required by the existing construction standard is the required demolding time, and the relation curve graph of time and penetration resistance is compared with the relation curve graph of mortar time and penetration resistance in the step S2 in a difference mode, so that the demolding time is further accurate, and errors are reduced.
The second step comprises the following substeps:
step S7: finding out the displacement value corresponding to the required demolding strength according to the relation curve graph of the displacement and the penetration resistance drawn in the step S6, inputting the displacement value corresponding to the required demolding strength into the control device through the control panel 13, placing the vertical centering base 14 on the surface of the concrete to be measured on site, aligning the support arm hole 17 of the measurement device with the support arm 15 of the base, inserting the measurement device, slowly pressing down the measurement device, when the measuring pin 8 passes through the measuring pin hole 16 to be in contact with the surface of the concrete to be measured, sounding the buzzer 6, recording the displacement value at the moment as a '0' value by the control device, continuously pressing down the measurement device to allow the measuring pin 8 to penetrate, when the value measured by the displacement sensor 9 is the same as the input displacement value, sounding the buzzer 6, stopping the pressing down, recording the penetration resistance value measured by the pressure sensor at the moment by the control device, the final measured value of the on-site demoulding strength is obtained (the unit of the penetration resistance and the strength are both MPa).
Furthermore, the step S2 and the step S3 are performed simultaneously, so that the experimental accuracy is ensured, and the experimental error is reduced.
Further, in step S7, 16 measuring points are selected for the concrete to be measured on site, 3 minimum values and 3 maximum values of the final measurement result are removed, and the arithmetic average of the remaining 10 measurement results is taken as the final measurement result, thereby reducing the experimental error again.
Finding out the time corresponding to the required penetration resistance according to the relation graph of the time and the penetration resistance drawn in the step S6, comparing the final measured value of the demolding strength measured in the step S7 with the required demolding strength value, if the final measured value is smaller, prolonging the demolding time of the sliding film, and if the final measured value is larger, shortening the demolding time of the sliding film.
Compared with the existing large-scale injection resistance measuring instrument, the measuring device is lighter, smaller, portable and simple to operate, the field operation is greatly facilitated, the device can measure the real demolding strength of the synovial membrane concrete field, the existing method is compared, the error can be greatly reduced, the demolding time can be determined more accurately, and therefore the construction quality and the safety are improved.
The foregoing is illustrative of the preferred embodiments of this invention, and it is to be understood that the invention is not limited to the precise form disclosed herein and that various other combinations, modifications, and environments may be resorted to, falling within the scope of the concept as disclosed herein, either as described above or as apparent to those skilled in the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. Slip form concrete field demoulding intensity measuring device which characterized in that: comprises a shell (1), a displacement sensor (9) and a vertical centering base (14), wherein a control device, a power supply device, a pressure sensor and a buzzer (6) are arranged in the shell (1), the power supply device is used for supplying power for a measuring device, a distance measuring rod (10) is arranged on the shell (1), one end of the distance measuring rod (10) is connected with the buzzer (6) inside the shell (1), the other end of the distance measuring rod extends out of the shell (1) and is connected with the displacement sensor (9), the displacement sensor (9) and the buzzer (6) are both electrically connected with the control device, a measuring needle (8) which is connected with the pressure sensor in a matching way is also arranged on the shell (1), the measuring needle (8) and the displacement sensor (9) are arranged at the same end of the shell (1), the pressure sensor is electrically connected with the control device, a digital display screen (12) and a control panel (13), digital display screen (12) and control panel (13) be connected with controlling means electricity, perpendicular centering base (14) center be equipped with survey needle (8) complex survey pinhole (16), still be equipped with two at least base support arms (15) on perpendicular centering base (14), be equipped with on shell (1) with base support arm (15) complex support arm hole (17).
2. The device for measuring the on-site demoulding strength of the slipform concrete according to claim 1, characterized in that: the power supply device comprises a power supply battery (2), and a charging interface (4) for charging the power supply battery (2) is arranged on the shell (1).
3. The device for measuring the on-site demoulding strength of the slipform concrete according to claim 1, characterized in that: the measuring needle (8) is detachably connected with the shell (1) through a fastening bolt (7).
4. The device for measuring the on-site demoulding strength of the slipform concrete according to claim 1, characterized in that: the control device comprises an integrated circuit board (11), and a data transmission interface (5) electrically connected with the integrated circuit board (11) is arranged on the shell (1).
5. The device for measuring the on-site demoulding strength of the slipform concrete according to claim 1, characterized in that: the shell (1) is provided with an operating handle (3).
6. A measuring method of a measuring apparatus according to any one of claims 1 to 5, comprising the steps of:
the method comprises the following steps: preparing a sample;
step two: measuring on site;
wherein, step one includes the following substeps:
step S1: mixing a concrete sample according to construction requirements, uniformly dividing the sample into two parts, and respectively recording the two parts as a first sample and a second sample, wherein the first sample is used for measuring mortar penetration resistance, and the second sample is used for measuring concrete penetration resistance;
step S2: taking a first test sample, screening mortar by adopting a standard screen with the aperture of a screen hole being 5mm, filling the screened mortar into a test mold, inserting and tamping the mortar to be compact, then measuring the injection resistance of the mortar at different times, and drawing a relation curve graph of the time and the injection resistance;
step S3: taking a second sample, filling the second sample into a test mold, inserting and tamping the second sample to be compact, standing the second sample for 1 to 2 hours, and then smoothing the surface of the second sample along a mold opening;
step S4: inputting one of the values of penetration resistance measured in step S2 into the control device through a control panel (13) based on the time-to-penetration resistance graph plotted in step S2, and the vertical centering base (14) is placed on the two surfaces of the sample after being leveled, the measuring device supporting arm hole (17) is aligned with the base supporting arm (15) to insert the measuring device, and the measuring device is slowly pressed downwards, when the measuring needle (8) penetrates through the measuring needle hole (16) to contact with the surface of the second sample, the buzzer (6) sends out a buzzing sound, the control device records the displacement value at the moment as a '0' value, the measuring device is continuously pressed down to enable the measuring needle (8) to penetrate into the second sample, when the value measured by the pressure sensor is the same as the input penetration resistance value, the buzzer (6) sends out buzzing sound, the pressing-down action is stopped at the moment, and the control device records the displacement value of the displacement sensor (9) at the moment;
step S5: repeating the step S4 until all penetration resistance values measured in the step S2 are measured;
step S6: drawing a graph of the relationship between displacement and penetration resistance according to the measurement result in the step S5, and drawing a graph of the relationship between time and penetration resistance;
the second step comprises the following substeps:
step S7: finding out a displacement value corresponding to the required demolding strength according to the relation curve graph of the displacement and the penetration resistance drawn in the step S6, inputting the displacement value corresponding to the required demolding strength into the control device through the control panel (13), placing the vertical centering base (14) on the surface of the concrete to be measured on site, aligning the support arm hole (17) of the measuring device with the support arm (15) of the base, inserting the measuring device into the control device, slowly pressing the measuring device downwards, when the measuring pin (8) penetrates through the support arm hole (16) to be contacted with the surface of the concrete to be measured, sounding the buzzer (6), recording the displacement value at the moment as a '0' value by the control device, continuing to press the measuring device to enable the measuring pin (8) to be penetrated, when the value measured by the displacement sensor (9) is the same as the input displacement value, stopping the pressing action, and the control device records the penetration resistance value measured by the pressure sensor at the moment, namely the final measured value of the on-site demoulding strength.
7. The method of claim 6, wherein: step S2 is performed simultaneously with step S3.
8. The method of claim 6, wherein: in step S7, 16 measuring points are selected for the concrete to be measured on site, 3 minimum values and 3 maximum values are removed from the final measurement result, and the arithmetic average of the remaining 10 measurement results is taken as the final measurement result.
9. The method of claim 6, wherein: finding out the time corresponding to the required penetration resistance according to the relation graph of the time and the penetration resistance drawn in the step S6, comparing the final measured value of the demolding strength measured in the step S7 with the required demolding strength value, if the final measured value is smaller, prolonging the demolding time of the sliding film, and if the final measured value is larger, shortening the demolding time of the sliding film.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010968131.4A CN111929201A (en) | 2020-09-15 | 2020-09-15 | Device and method for measuring on-site demoulding strength of slip form concrete |
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| CN202010968131.4A CN111929201A (en) | 2020-09-15 | 2020-09-15 | Device and method for measuring on-site demoulding strength of slip form concrete |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114136840A (en) * | 2021-12-09 | 2022-03-04 | 中国建筑材料科学研究总院有限公司 | 3D printing concrete constructability detection device and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114136840A (en) * | 2021-12-09 | 2022-03-04 | 中国建筑材料科学研究总院有限公司 | 3D printing concrete constructability detection device and method |
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