CN111398350A - Concrete hydration heat-based device and method for detecting quality of concrete in bored pile hole expansion - Google Patents
Concrete hydration heat-based device and method for detecting quality of concrete in bored pile hole expansion Download PDFInfo
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- CN111398350A CN111398350A CN202010252005.9A CN202010252005A CN111398350A CN 111398350 A CN111398350 A CN 111398350A CN 202010252005 A CN202010252005 A CN 202010252005A CN 111398350 A CN111398350 A CN 111398350A
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Abstract
The invention provides a device and a method for detecting the quality of concrete in a bored pile reaming based on concrete hydration heat, wherein the device comprises the following steps: the member is integrated, guide sleeve and serial temperature sensor, the member is integrated including settling the upper and lower preface articulated guide bar in guide sleeve at least, go up the armed lever, armed lever and end lever down, be equipped with two pairs of at least leading wheels on the guide bar body of rod, leading wheel and guide sleeve inner wall rolling contact, guide sleeve has the cavity that holds the member is integrated, the rectangle opening that supplies upper boom and lower armed lever outside the buckling extension is seted up to guide sleeve middle part lateral wall, guide sleeve's bottom and end lever bottom fixed connection, serial temperature sensor includes cable and a plurality of temperature sensor, the cable is located side by side in the guide sleeve with the member is integrated, a plurality of temperature sensor are fixed in the upper boom and the lower armed lever outside, the external detection device of cable. The invention solves the problems of concrete hydration heat temperature test and concrete quality detection in the bored pile reaming.
Description
Technical Field
The invention relates to the technical field of pile foundation engineering and soil engineering testing, in particular to a device and a method for detecting the quality of concrete in a bored pile hole expansion based on concrete hydration heat.
Background
The cast-in-place pile is the most common pile foundation form, and with the continuous improvement of the requirement on the bearing capacity of the foundation of large-scale building structures such as high-rise buildings, heavy ports and docks, long and large bridges and the like, the traditional cast-in-place pile with the uniform cross section is designed to be longer and longer, and even reaches more than one hundred meters in some projects. The ultra-long cast-in-place pile has higher bearing capacity, but the construction quality control difficulty is high, and long-term settlement after construction is obvious, so that a plurality of engineering problems are caused. Compared with the cast-in-place pile with the uniform cross section, the special-shaped cast-in-place pile such as a manual hole expanding cast-in-place pile and a mechanical hole extruding and expanding cast-in-place pile can better play the compression resistance of soil and improve the ratio of end resistance, thereby optimizing the pile length. In recent years, as the development of hole expanding equipment tends to be mature, the special-shaped cast-in-place piles are increasingly used.
However, the special-shaped cast-in-place pile has similar concrete quality problems as the uniform section cast-in-place pile, such as mud entrapment, segregation and the like, and particularly the concrete quality at the reaming position has a relatively greater risk. At present, an effective technical means is still lacked for concrete quality detection of a hole expanding section of a special-shaped cast-in-place pile, and traditional cast-in-place pile quality detection means including a low-strain reflection wave method, a cross-hole ultrasonic method, a drilling coring method and the like are difficult to apply. The application of the special-shaped cast-in-place pile is restricted by the shortage and lack of quality detection means. Therefore, the effective method and the feasible device for detecting the quality of the concrete in the reamed holes have important engineering significance.
Disclosure of Invention
The invention aims to provide a concrete hydration heat-based bored pile reamed concrete quality detection device which can be applied to engineering sites and is simple, convenient and easy to operate, so as to effectively solve the problem that the existing bored pile quality detection method cannot detect the quality of concrete in a reamed hole.
In order to achieve the above object, the present invention provides a device for detecting the quality of concrete in a bored pile hole expansion based on the heat of hydration of the concrete, and a device for detecting the quality of concrete in a bored pile hole expansion based on the heat of hydration of the concrete, including: a rod assembly, a guide sleeve and a serial temperature sensor,
the rod assembly at least comprises a guide rod, an upper arm rod, a lower arm rod and an end rod which are sequentially hinged up and down and are arranged in the guide sleeve, at least two pairs of guide wheels are arranged on the rod body of the guide rod, the guide wheels are in rolling contact with the inner wall of the guide sleeve,
the guide sleeve is provided with a cavity for accommodating the rod piece assembly, the side wall of the middle part of the guide sleeve is provided with a rectangular opening for the upper arm rod and the lower arm rod to bend and extend outwards, the bottom of the guide sleeve is fixedly connected with the bottom of the end rod,
the serial temperature sensor comprises a cable and a plurality of temperature sensors connected to the cable, the cable and the rod piece are integrated and arranged in the guide sleeve in parallel, the temperature sensors are fixed to the outer sides of the upper arm rod and the lower arm rod, and the cable is externally connected with an external detection device.
The rod piece assembly further comprises an extension rod positioned at the top of the guide rod, the extension rod is fixedly connected with the guide rod in a detachable mode, and the top end of the extension rod is higher than the top of the guide sleeve.
The upper arm rod and the lower arm rod are hinged through a pin and a pin nut, a pre-biased ejector rod is arranged on the outer side of the pin nut, the pre-biased ejector rod is arranged back to the rectangular opening of the guide sleeve, and the free end of the pre-biased ejector rod is in contact with the inner wall of the guide sleeve opposite to the rectangular opening.
The concrete hydration heat-based device for detecting the quality of the concrete in the bored concrete pile reaming hole is provided with a plurality of sets of devices which are respectively arranged at different positions of the cross section of the reinforcement cage.
The device for detecting the concrete quality in the multiple sets of cast-in-place pile reamers arranged in different directions based on the concrete hydration heat is provided with upper arm rods with different specification lengths and lower arm rods with different specification lengths.
Set up in the device of concrete quality detection in the bored concrete pile reaming of different position based on concrete hydration heat, have different limit contained angles between its articulated upper arm pole of connecting and the lower arm pole, limit contained angle range is from 180 degrees ~ 30 degrees.
The invention also aims to provide a method for detecting the quality of concrete in the reamed hole of the cast-in-place pile by using the device.
In order to achieve the purpose, the invention provides a method for detecting the quality of concrete in a bored pile hole expansion based on concrete hydration heat, which comprises the following steps:
s1, assembling the device for detecting the concrete quality in the bored pile reaming based on the concrete hydration heat according to any one of the claims 1-4;
s2, binding the device for detecting the concrete quality in the bored pile hole based on the concrete hydration heat to the outer side of a reinforcement cage along the axial direction of the reinforcement cage, and putting the reinforcement cage in the bored pile hole, so that the height of a connecting pin shaft of a lower arm rod and an end rod is higher than the designed elevation of a hole-expanding bottom in the bored pile hole and lower than the designed elevation of a hole-expanding top in the bored pile hole;
s3, after the steel reinforcement cage is lowered to the designed elevation, removing the temporary fixation of the rod piece integration, applying load on the top of the rod piece integration to enable the rod piece integration to move downwards until the elevation of the connecting pin shaft of the guide rod and the upper arm rod is lower than the designed elevation of the counterbored top in the pile hole of the cast-in-place pile, and then temporarily fixing the top of the rod piece integration to limit the rod piece integration to move along the guide sleeve;
s4, after concrete is poured, collecting the temperature of each temperature sensor on the serial temperature sensor cable at equal intervals, stopping collecting until the change curve of the temperature value of the temperature sensor on the serial temperature sensor cable along with time shows an obvious peak value, and recording the peak value time;
s5, after the collection is finished, drawing a temperature-time curve of the temperature value of each temperature sensor changing along with time by using the same time axis, and drawing a temperature-depth curve of the temperature value of each temperature sensor on the serial temperature sensor on the same serial temperature sensor cable changing along with the depth of the sensor at the peak time by using the same depth axis;
s6, analyzing the temperature-time curve, and judging the concrete quality condition according to the following mode:
s6-1, when the temperature value recorded by a certain temperature sensor or a plurality of continuous temperature sensors on the peak time serial temperature sensor cable is significantly lower than the temperature values recorded by other adjacent temperature sensors, the quality of the concrete at the position or in the adjacent area of the temperature sensor or the plurality of continuous temperature sensors is defective;
s6-2, when the temperature value recorded by a certain temperature sensor or a plurality of continuous temperature sensors on the serial temperature sensor cable changes little or is obviously smaller than the temperature change amplitude of the adjacent temperature sensor along with the time, the quality of the concrete at the position or the adjacent area of the temperature sensor or the plurality of continuous temperature sensors has defects;
s6-3, if a significant temperature peak is visible in the corresponding designed reaming depth range in the obtained temperature-depth curve, reaming is visible, the starting point of the temperature peak is the actual reaming top, the end point of the temperature peak is the actual reaming bottom, and the difference value of the two is the actual reaming height; if no obvious temperature peak is found, the reaming coagulation quality is defective or the reaming is not visible.
Preferably, the temperature sensor burying depth range covers from one pile diameter depth above the design reaming top to one pile diameter depth below the design reaming bottom.
The invention has the beneficial effects that:
(1) the method can realize the detection and analysis of the quality of the bored concrete of the cast-in-place pile under the condition of no excavation or core drilling. The method can begin to collect data for analysis after the cast-in-place pile concrete is cast, can find out the problem of concrete quality defects as early as possible, and is favorable for implementing defect treatment measures.
(2) The device adopted by the method is simple to operate, the specification and the size of each part of the device can be flexibly adjusted according to the specific installation position requirement, and the adaptability is strong.
Drawings
Fig. 1 is a schematic overall structure diagram of the device for detecting the concrete quality in the reamed bored pile based on the concrete hydration heat.
Fig. 2 is a schematic structural view of the connecting portion of the extension pole and the guide pole according to the present invention.
Fig. 3a is a schematic front view of the guide bar of the present invention.
Fig. 3b is a schematic side view of the guide bar of the present invention.
Fig. 4a is a schematic front view of the upper arm rod of the present invention.
Fig. 4b is a schematic side view of the upper arm of the present invention.
Fig. 5a is a front view of the lower arm of the present invention.
Fig. 5b is a side view of the lower arm of the present invention.
Fig. 6a is a schematic front view of an end rod of the present invention.
Fig. 6b is a side view of the end rod of the present invention.
Fig. 7a is an installation schematic diagram of the device for detecting the concrete quality in the reamed bored pile based on the concrete hydration heat, which is placed in the hole along with the steel reinforcement cage.
FIG. 7b is a schematic view of the concrete hydration heat based device for detecting the quality of concrete in a bored concrete pile under a reamed hole.
FIG. 8 is a temperature-depth curve diagram obtained by testing when a limit included angle is 180 degrees by the device for detecting the concrete quality in the bored concrete pile under the condition of concrete hydration heat.
Fig. 9 is a temperature-time graph obtained from a temperature sensor test of fig. 8 for depth corresponding to the temperature peak.
Wherein the content of the first and second substances,
the cast-in-place pile comprises a cast-in-place pile equal-diameter position 1, a cast-in-place pile hole expanding position 2, a reinforcement cage 3, a guide rod 4, an upper arm rod 5, a lower arm rod 6, an end rod 7, a guide sleeve 8, a cable 9, an upper guide wheel 10, a lower guide wheel 11, an upper guide wheel pin nut 12, a lower guide wheel pin nut 13, a guide rod and upper arm rod connecting pin nut 14, an upper arm rod and lower arm rod connecting pin nut 15, a lower arm rod and end rod connecting pin nut 16, a pre-deflection ejector rod 17, a guide sleeve rectangular opening 18, an extension rod 19, an extension rod screw hole 20, a guide rod screw rod 21, a pin hole 22, a guide wheel hole 23, an upper guide wheel pin shaft 24, a lower guide wheel pin shaft 25, a guide rod and upper arm rod connecting pin shaft 26, an upper arm rod and lower arm rod connecting pin shaft 27, a lower arm rod and end rod connecting.
Detailed Description
In order to make the technical features, objects and effects of the present invention clearer and more intuitive, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
As shown in fig. 1, the apparatus for detecting concrete quality in a bored pile under-reamed hole based on concrete hydration heat includes: rod piece integration, guide sleeve and serial temperature sensor.
The rod assembly comprises an extension rod 19, a guide rod 4, an upper arm rod 5, a lower arm rod 6 and an end rod 7 which are arranged in a guide sleeve and are sequentially connected up and down. The extension rod 19 is positioned at the top of the guide rod, is provided with an extension rod screw hole 20, and is detachably and fixedly connected with the guide rod 4 through a guide rod screw 21, and the top end of the extension rod is higher than the top of the guide sleeve. The guide rod 4 is hinged to the upper arm rod 5 through a guide rod and upper arm rod connecting pin shaft 26 and a guide rod and upper arm rod connecting pin shaft nut 14, the upper arm rod 5 is hinged to the lower arm rod 6 through an upper arm rod and lower arm rod connecting pin shaft 27 and an upper arm rod and lower arm rod connecting pin shaft nut 15, the lower arm rod 6 is hinged to the end rod 7 through a lower arm rod and end rod connecting pin shaft 28 and a lower arm rod and end rod connecting pin shaft nut 16, and therefore multi-connecting-rod integration that the guide rod, the upper arm rod, the lower arm rod and the end rod can be movably hinged is achieved.
The guide rod 4 is provided with an upper guide wheel 10 and a lower guide wheel 11, and the upper guide wheel and the lower guide wheel respectively have the same height difference with the upper end and the lower end of the guide rod. The guide rod wall is provided with a guide wheel hole 23 and a pin shaft hole 22 at the mounting positions of the upper guide wheel and the lower guide wheel, an upper guide wheel pin shaft 24 and a lower guide wheel pin shaft 25 respectively penetrate through the upper pin shaft hole 22 and the lower pin shaft hole 22 to be fixed on the guide rod, and the guide wheel is in rolling contact with the guide sleeve through the guide wheel hole 23 to ensure that the guide wheel axially slides in the guide sleeve.
The guide sleeve 8 is a cylindrical component with a cavity for accommodating the rod piece assembly, a rectangular opening is formed in the side wall of the middle of the guide sleeve and used for enabling the upper arm rod and the lower arm rod to bend outwards and extend out, and the bottom of the guide sleeve 8 is fixedly connected with the bottom of the end rod 7.
And a pre-biased ejector rod 17 is arranged on the outer side of the upper arm rod and the lower arm rod connecting pin shaft nut 15, the pre-biased ejector rod is arranged back to the rectangular opening of the guide sleeve, and the free end of the pre-biased ejector rod is in contact with the inner wall of the guide sleeve opposite to the rectangular opening.
The serial temperature sensor comprises a cable 9 and a plurality of temperature sensors 29 connected to the cable 9, the cable 9 and the rod are integrated and arranged in parallel in the guide sleeve 8, and the plurality of temperature sensors 29 used for testing the temperature of the concrete are arranged on the outer sides of the corresponding positions of the upper arm rod and the lower arm rod. The cable 9 is bound from the bottom of the end rod 7 along the integrated side of the rod to the top of the extension rod 19, and extends out of the top opening of the guide sleeve to be connected with an external detection device.
When the top end of the extension rod 19 is loaded to enable the extension rod to generate downward displacement, the end rod and the bottom of the guide sleeve are fixed together and cannot move downwards, so that the upper arm rod 5 and the lower arm rod 6 transversely move under the action of the upper and lower pressure and extend outwards from the rectangular opening; when the top end of the extension rod 19 is pulled upwards by applying an upward pulling force, the upper arm rod 5 and the lower arm rod 6 are also straightened by rotating around the pin shaft and retracted from the rectangular opening of the guide sleeve.
The device for detecting the concrete quality in the bored concrete pile reaming based on the concrete hydration heat can be simultaneously provided with a plurality of sets of devices which are respectively arranged at different positions of the cross section of the reinforcement cage. And the concrete quality detection devices arranged in the multiple sets of cast-in-place pile reamers in different directions based on the concrete hydration heat have upper arm rods with different specification lengths and lower arm rods with different specification lengths, so that different limit included angles are formed between the upper arm rods and the lower arm rods which are connected in a hinged mode.
The detection method comprises the following steps:
s1, before the reinforcement cage is lowered, the device for detecting the concrete quality in the bored pile reaming based on the concrete hydration heat is assembled, the pre-biased ejector rod 17 is in contact with the inner wall of the guide sleeve opposite to the rectangular opening 18 of the guide sleeve, and then the extension rod 19 is temporarily fixed so as to limit the rod piece to be integrated in the guide sleeve 8 to slide;
s2, binding the device to the outer side of the steel reinforcement cage 3 along the axial direction of the steel reinforcement cage 3, and lowering the steel reinforcement cage 3 to enable the elevation of the lower arm rod and the end rod connecting pin shaft 28 to be higher than the designed elevation of the bottom of the bored pile hole and lower than the designed elevation of the top of the bored pile hole;
s3, after the reinforcement cage 3 is placed to the designed elevation, the temporary fixation of the extension rod 19 is removed, and then the load is applied to the top of the extension rod 19 to enable the extension rod to move downwards until the elevation of the guide rod and the upper arm rod connecting pin shaft 26 is lower than the designed counterboring top elevation. Extension rod 19 is then temporarily fixed to restrict its movement along guide sleeve 8;
meanwhile, a plurality of sets of the device for detecting the concrete quality in the bored pile chambering based on the concrete hydration heat are arranged in different directions of the cross section of the steel reinforcement cage, so that a plurality of serial temperature sensors can be arranged in different directions of a pile hole, and the concrete quality detection in different directions in the hole can be comprehensively covered.
To the device of concrete quality detection in the bored concrete pile reaming based on concrete hydration heat in different position, set up the upper arm pole and the lower arm pole length of different specifications to the limit contained angle that the articulated upper arm pole of messenger after the pressurized and lower arm pole buckle in the reaming is different, and the position of limit contained angle can be followed straight angle (upper arm pole and lower arm pole stretch each other) -acute angle (for example 30 degrees) and changed, thereby changes the position of attaching to the temperature sensor on upper arm pole and the lower arm pole, the temperature condition in the reaming is faithfully reflected.
The temperature sensor embedding depth range covers the depth from one time of pile diameter above the designed reaming top to one time of pile diameter below the designed reaming bottom, so that the temperature range to be measured can be completely covered.
S4, after concrete is poured, collecting the temperature of each temperature sensor on the serial temperature sensor cable at equal intervals, stopping collecting until the change curve of the temperature values of most temperature sensors on the serial temperature sensor cable along with time shows an obvious peak value, and recording the peak value time;
s5, after the collection is finished, drawing a temperature-time curve of temperature values of all temperature sensors changing along with time by using the same time axis, and drawing a temperature-depth curve of temperature values of all temperature sensors of the same serial temperature sensor cable changing along with the depth of the sensors at the peak time by using the same depth axis;
s6, analyzing the temperature-time curve and the temperature-depth curve, and judging the concrete quality condition according to the following modes:
s6-1, when the temperature value recorded by a certain temperature sensor or a plurality of continuous temperature sensors on the peak time serial temperature sensor cable is significantly lower than the temperature values recorded by other adjacent temperature sensors, the quality of the concrete at the position or in the adjacent area of the temperature sensor or the plurality of continuous temperature sensors is defective;
as with the temperature-time curve shown in fig. 9, curve d reflects a situation where the peak time temperature value for the corresponding temperature sensor is significantly lower than the peak time temperature value recorded by the adjacent temperature sensor (curves a, b, c), suggesting that there is a defect in the quality of the concrete at the location or in the vicinity of the corresponding temperature sensor.
S6-2, when the temperature value recorded by a certain temperature sensor or a plurality of continuous temperature sensors on the serial temperature sensor cable changes little or is obviously smaller than the temperature change amplitude of the adjacent temperature sensor along with the time, the quality of the concrete at the position or the adjacent area of the temperature sensor or the plurality of continuous temperature sensors has defects;
s6-3, if a significant temperature peak is visible in the corresponding designed reaming depth range in the obtained temperature-depth curve, reaming is visible, the starting point of the temperature peak is the actual reaming top, the end point of the temperature peak is the actual reaming bottom, and the difference value of the two is the actual reaming height; if no obvious temperature peak is found, the reaming coagulation quality is defective or the reaming is not visible.
The temperature-depth curve shown in fig. 8 is a temperature-depth curve of the device for detecting the concrete quality in the bored concrete pile under reaming based on the concrete hydration heat, wherein the limit included angle between the upper arm rod and the lower arm rod is approximately 180 (i.e. under the condition of straightening), and the temperature-depth curve reflects that z1 is the starting point of the temperature peak as the actual reaming top, and z2 is the ending point of the temperature peak as the actual reaming bottom.
The cast-in-place concrete can generate heat due to hydration reaction in the solidification process, and the generated heat is closely related to the volume of the concrete, the quality of the concrete and the environment of the concrete. When the concrete has the defects of mud inclusion, segregation and the like, the heat production quantity of the hydration reaction of the concrete is reduced, the heat conductivity of the defective concrete is deteriorated, and the hydration heat temperature of the defective concrete and the concrete in the adjacent area in the solidification process is lower than the working condition without defects, so that the hydration heat temperature change rule of the concrete can be monitored through a certain temperature measuring point or a plurality of adjacent temperature measuring points in the concrete, and the pouring quality of the concrete at the temperature measuring points or the adjacent area is further analyzed. In addition, when the concrete is contacted with ordinary atmospheric temperature environment media such as air, water, soil and the like in the solidification process, because the contact interface has obvious heat exchange, the temperature of the area of the concrete, which is closer to the contact interface, is closer to the temperature of the environment media, so that the hydration heat distribution rule of the concrete can be monitored through a plurality of temperature measuring points near the concrete boundary, and the boundary position of the concrete is further analyzed. In addition, compared with the cast-in-place pile with the uniform cross section, the concrete of the hole expansion section of the cast-in-place pile is equivalent to that the concrete volume is increased on the basis of the concrete of the cast-in-place pile with the uniform cross section in an annular mode, so that the hydration heat temperature of the position of a steel reinforcement cage of the cast-in-place pile is higher than that of the uniform cross section corresponding to the hole expansion position, a temperature peak is formed, the starting point and the ending point of the temperature peak respectively correspond to the top and the bottom of the hole expansion. Based on the principle, the temperature sensors are arranged in the bored concrete pile hole expanding and on the outer side of the reinforcement cage corresponding to the hole expanding to monitor the change rule of the hydration heat temperature of the concrete along with time and the distribution rule along with space, so that the pouring quality of the expanded concrete can be analyzed.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (8)
1. The utility model provides a device that concrete quality detected in bored concrete pile reaming based on concrete heat of hydration, its characterized in that includes: a rod assembly, a guide sleeve and a serial temperature sensor,
the rod assembly at least comprises a guide rod, an upper arm rod, a lower arm rod and an end rod which are sequentially hinged up and down and are arranged in the guide sleeve, at least two pairs of guide wheels are arranged on the rod body of the guide rod, the guide wheels are in rolling contact with the inner wall of the guide sleeve,
the guide sleeve is provided with a cavity for accommodating the rod piece assembly, the side wall of the middle part of the guide sleeve is provided with a rectangular opening for the upper arm rod and the lower arm rod to bend and extend outwards, the bottom of the guide sleeve is fixedly connected with the bottom of the end rod,
the serial temperature sensor comprises a cable and a plurality of temperature sensors connected to the cable, the cable and the rod piece are integrated and arranged in the guide sleeve in parallel, the temperature sensors are fixed to the outer sides of the upper arm rod and the lower arm rod, and the cable is externally connected with an external detection device.
2. The apparatus for detecting the quality of concrete in a bored pile extension hole based on the heat of hydration of concrete according to claim 1, wherein: the rod piece assembly further comprises an extension rod positioned at the top of the guide rod, the extension rod is fixedly connected with the guide rod in a detachable mode, and the top end of the extension rod is higher than the top of the guide sleeve.
3. The apparatus for detecting the quality of concrete in a bored pile extension hole based on the heat of hydration of concrete according to claim 1, wherein: the upper arm rod and the lower arm rod are hinged through a pin and a pin nut, a pre-biased ejector rod is arranged on the outer side of the pin nut, the pre-biased ejector rod is arranged back to the rectangular opening of the guide sleeve, and the free end of the pre-biased ejector rod is in contact with the inner wall of the guide sleeve opposite to the rectangular opening.
4. The apparatus for detecting the quality of concrete in a bored pile extension hole based on the heat of hydration of concrete according to claim 1, wherein: the concrete hydration heat-based device for detecting the quality of the concrete in the bored concrete pile reaming hole is provided with a plurality of sets of devices which are respectively arranged at different positions of the cross section of the reinforcement cage.
5. The apparatus for detecting the quality of concrete in a bored pile extension hole based on the heat of hydration of concrete according to claim 4, wherein: the device for detecting the concrete quality in the multiple sets of cast-in-place pile reamers based on the concrete hydration heat, which are arranged in different directions, is provided with upper arm rods with different specification lengths and lower arm rods with different specification lengths.
6. The apparatus for detecting the quality of concrete in a bored pile extension hole based on the heat of hydration of concrete according to claim 4, wherein: set up in the device of concrete quality detection in the bored concrete pile reaming of different position based on concrete hydration heat, have different limit contained angles between its articulated upper arm pole of connecting and the lower arm pole, limit contained angle range is from 180 degrees ~ 30 degrees.
7. A method for detecting the quality of concrete in a bored pile reaming based on concrete hydration heat is characterized by comprising the following steps:
s1, assembling the device for detecting the concrete quality in the bored pile reaming based on the concrete hydration heat according to any one of the claims 1-6;
s2, binding the device for detecting the concrete quality in the bored pile reaming based on the concrete hydration heat to the outer side of a reinforcement cage along the axial direction of the reinforcement cage, and lowering the reinforcement cage into the bored pile hole to enable the height of a connecting pin shaft of a lower arm rod and an end rod to be higher than the designed elevation of a reaming bottom in the bored pile hole and lower than the designed elevation of a reaming top in the bored pile hole;
s3, after the steel reinforcement cage is lowered to the designed elevation, removing the temporary fixation of the rod piece integration, applying load on the top of the rod piece integration to enable the rod piece integration to move downwards until the elevation of the connecting pin shaft of the guide rod and the upper arm rod is lower than the designed elevation of the counterbored top in the pile hole of the cast-in-place pile, and then temporarily fixing the top of the rod piece integration to limit the rod piece integration to move along the guide sleeve;
s4, after concrete is poured, collecting the temperature of each temperature sensor on the serial temperature sensor cable at equal intervals, stopping collecting until the change curve of the temperature value of the temperature sensor on the serial temperature sensor cable along with time shows an obvious peak value, and recording the peak value time;
s5, after the collection is finished, drawing a temperature-time curve of the temperature value of each temperature sensor changing along with time by using the same time axis, and drawing a temperature-depth curve of the temperature value of each temperature sensor on the same serial temperature sensor cable on the serial temperature sensor at the peak time along with the change of the depth of the sensor by using the same depth axis;
s6, analyzing the temperature-time curve and the temperature-depth curve, and judging the concrete quality condition according to the following modes:
s6-1, when the temperature value recorded by a certain temperature sensor or a plurality of continuous temperature sensors on the peak time serial temperature sensor cable is significantly lower than the temperature values recorded by other adjacent temperature sensors, the quality of the concrete at the position or in the adjacent area of the temperature sensor or the plurality of continuous temperature sensors is defective;
s6-2, when the temperature value recorded by a certain temperature sensor or a plurality of continuous temperature sensors on the serial temperature sensor cable changes little or is obviously smaller than the temperature change amplitude of the adjacent temperature sensor along with the time, the quality of the concrete at the position or the adjacent area of the temperature sensor or the plurality of continuous temperature sensors has defects;
s6-3, if a significant temperature peak is visible in the corresponding designed reaming depth range in the obtained temperature-depth curve, reaming is visible, the starting point of the temperature peak is the actual reaming top, the end point of the temperature peak is the actual reaming bottom, and the difference value of the two is the actual reaming height; if no obvious temperature peak is found, the reaming coagulation quality is defective or the reaming is not visible.
8. The method of claim 7, wherein: the temperature sensor embedding depth range covers one time of pile diameter depth above the designed reaming top to one time of pile diameter depth below the designed reaming bottom.
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| CN112162009A (en) * | 2020-12-02 | 2021-01-01 | 上海建工集团股份有限公司 | Cement-soil wall construction quality detection method based on temperature distribution monitoring |
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2020
- 2020-04-01 CN CN202010252005.9A patent/CN111398350A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112162009A (en) * | 2020-12-02 | 2021-01-01 | 上海建工集团股份有限公司 | Cement-soil wall construction quality detection method based on temperature distribution monitoring |
| CN112162009B (en) * | 2020-12-02 | 2021-04-02 | 上海建工集团股份有限公司 | Cement-soil wall construction quality detection method based on temperature distribution monitoring |
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