A cast-in-place pile body internal concrete hydration heat temperature measuring device and method

Abstract

The application discloses a cast-in-place pile body internal concrete hydration heat temperature measuring device and method. The device comprises a winding drum integration, a guide device, a guide groove pipe, a flat cable and a temperature measuring assembly. The winding drum integration is connected with one end of the flat cable through the guide device. The other end of the flat cable extends into the cavity of the guide groove pipe and is connected with the temperature measuring assembly which is also located in the cavity of the guide groove pipe. The flat cable is arranged along the axial direction of the guide groove pipe. The winding drum integration is used for lifting the temperature measuring assembly and makes the temperature measuring assembly lift along the axial direction of the guide groove pipe. The guide groove pipe is installed in the pile body applied by the measuring device during measurement and is arranged along the axial direction of the pile body, so that the temperature measuring assembly can measure the temperature at different height positions of the pile body during the lifting process. The application has the advantages of strong operability, high stability, reusability, economy, environmental protection and cost reduction of the pile body defect detection based on the hydration heat anomaly.

Description

Technical Field

[0001] This invention relates to the field of pile temperature monitoring technology, specifically a device and method for measuring the hydration heat temperature of concrete inside a cast-in-place pile. Background Technology

[0002] Cast-in-place piles are a commonly used type of pile foundation. During the solidification process of the pile concrete, a thermochemical transformation occurs, known as the heat of hydration. The amount and proportion of heat of hydration released are closely related to factors such as the quality, volume, and shape of the pile concrete. This means that measuring the temperature of the pile can help determine whether the continuity and shape of the pile material meet the requirements. Therefore, temperature monitoring of cast-in-place piles is necessary.

[0003] In general, in concrete piles, the reinforcing cage is typically located in the periphery of the pile. Because the periphery has a larger contact area with the surrounding environment (such as soil, rock, water, or air) compared to the center of the pile, heat dissipates more easily, resulting in a lower temperature at the location of the reinforcing cage. Conversely, the portion closer to the center of the pile has a smaller contact area with the surrounding environment, leading to slower heat dissipation and a higher temperature. When there are defects in the pile, such as voids, necking, mud inclusions, or poor concrete quality, the hydration heat generated in these areas of the pile is usually less than in the undefected normal areas. Correspondingly, if the pile has enlarged diameter, the concrete near the enlarged area will generate more heat. Therefore, by measuring the temperature profile inside the pile, potential concrete defects can be identified, the effective dimensions of the pile foundation can be estimated, and the thickness of the reinforcing cage outer sheath and the verticality of the reinforcing cage can be checked.

[0004] Currently, existing methods for measuring pile temperature typically involve pre-embedded temperature sensors to obtain the temperature distribution inside the pile. This method requires uniformly embedding multiple sensor cables around the pile, with each cable parallel to the pile axis and several sensors evenly spaced along the pile body. All cables and sensors are tied to the reinforcing cage and cast into the concrete. These cables and sensors are disposable consumables, which are not only costly but also easily damaged during concrete pouring, potentially affecting subsequent pile quality testing and analysis. Therefore, there is an urgent need to develop a low-cost and reusable device for measuring the heat of hydration temperature inside the pile, eliminating the need for pre-embedded sensors and cables and reducing the cost of disposable consumables. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the present invention aims to provide a device and method for measuring the heat of hydration temperature of concrete inside cast-in-place piles, which can solve the problems described in the background art.

[0006] The technical solution to achieve the objective of this invention is as follows: a device for measuring the hydration heat and temperature of concrete inside a cast-in-place pile, comprising a drum assembly, a guide device, a guide tube, a flat cable, and a temperature measuring component. The drum assembly is connected to one end of the flat cable via the guide device. The other end of the flat cable extends into the cavity of the guide tube and is connected to the temperature measuring component, which is also located within the cavity of the guide tube. The flat cable is arranged along the axial direction of the guide tube. The drum assembly is used to raise and lower the temperature measuring component, thereby allowing the temperature measuring component to rise and fall along the axial direction of the guide tube. The guide tube is installed within the pile body to which the measuring device is applied during measurement and is arranged along the axial direction of the pile body, so that the temperature measuring component can measure the temperature at different heights of the pile body during the up-and-down movement of the guide tube.

[0007] Furthermore, the drum integration includes a drum, a servo motor, an encoder, and signal line pins. One end of the flat cable is wound around the drum, thereby connecting the flat cable to the drum integration. The flat cable is electrically connected to the signal line pins. The output end of the servo motor is connected to the drum, and the servo motor is coaxially mounted with the drum to drive the drum to rotate in both directions. This drives the drum to rotate synchronously and wind up the flat cable. The servo motor is also connected to the encoder, which is used to collect the rotation status of the servo motor.

[0008] Furthermore, the signal line pins are positioned along the axis of the reel and exposed at one end of the reel.

[0009] Furthermore, it also includes a data acquisition unit, a servo driver, and a computer. The data acquisition unit is electrically connected to the signal line pins so that data transmitted via the flat cable can be acquired through the signal line pins. The data acquisition unit is also connected to the computer so that the acquired data can be uploaded to the computer. The servo driver is also connected to the computer. The computer controls the servo driver to issue commands to drive the servo motor so that the servo motor is driven under the control of the servo driver, including controlling the rotation speed and reverse direction of the servo motor. The encoder acquires the rotation state of the servo motor and sends it to the servo driver so that the rotation speed and reverse direction of the servo motor can be adjusted according to the current rotation state of the servo motor.

[0010] Furthermore, the flat cable includes a metal sheath and a signal transmission line nested within the metal sheath. The metal sheath is wound on a reel, and the signal transmission line is electrically connected to the signal line pin. The other end of the signal transmission line extends out of the metal sheath and is connected to the temperature measuring component. The metal sheath extends into the temperature measuring component.

[0011] Furthermore, the temperature measuring component includes a counterweight housing with a cavity, an infrared temperature sensor and a guide roller mounted on the outer wall of the counterweight housing. One end of a flat cable extends into the cavity of the counterweight housing, and a signal transmission line extending from the Jin Shun soft sheath is electrically connected to the infrared temperature sensor fixed on the outer wall of the counterweight housing. The guide roller and the infrared temperature sensor are spaced apart along the axial direction of the counterweight housing, with the guide roller positioned on top. The guide roller is slidably connected to the guide groove tube, so that the temperature measuring component can slide along the axial direction of the guide groove tube via the guide roller.

[0012] Furthermore, two infrared temperature sensors are installed on the counterweight housing. The two infrared temperature sensors are symmetrically installed on the housing so that one infrared temperature sensor can measure towards the axis of the pile body, and the other infrared temperature sensor can measure away from the axis of the pile body.

[0013] Furthermore, the guide tube includes a guide post with a through hole and a guide groove excavated on the guide post. The guide groove is arranged along the axial direction of the guide post and located on the side of the guide post near the through hole. The guide roller is embedded in the guide groove, thereby realizing a directional sliding connection between the guide roller and the guide groove.

[0014] The guide post is provided with N sets of guide grooves, where N is a non-zero natural number. Each set of guide grooves includes two guide grooves, and the two guide grooves in the same set are symmetrically arranged on the guide post. Each guide groove is arranged along the circumference of the guide shaft.

[0015] M sets of guide rollers are provided, where M is a non-zero natural number. Each set of guide rollers includes two guide rollers. The two guide rollers in the same set are symmetrically arranged on the counterweight housing. Each guide roller is arranged along the circumference of the counterweight housing. Each set of guide rollers corresponds one-to-one with the guide groove. The corresponding set of guide rollers is embedded in the guide groove of the corresponding set.

[0016] Furthermore, the guiding device includes a housing, a conduit, a brush, brush pins, and a directional pulley. The housing is fixedly mounted on the top end of the conduit, and the bottom end of the conduit is mounted on a guide post. A flat cable extends from the through-hole of the conduit and is wound around the directional pulley. The flat cable leading from the directional pulley is wound around a drum, and the signal transmission line on the flat cable is electrically in contact with one end of the brush. The other end of the brush passes through the housing and is mounted on the housing. Brush pins are also provided on the end of the brush exposed on the housing. The brush pins are connected to the signal line pins, thereby connecting the signal transmission line to the signal line pins. The directional pulley is suspended on the housing by a bracket, and the bracket is mounted on the housing.

[0017] The outer surface of the conduit is provided with a raised strip, which is embedded in the guide groove installed on the guide post, so that the conduit can be slidably installed on the guide post.

[0018] A method for measuring the heat of hydration temperature of concrete inside a cast-in-place pile, applied to the aforementioned measuring device, includes the following steps:

[0019] Step 1: During the binding of the reinforcing cage of the pile to be tested, install the actual number of measuring lines, i.e. the required positions, and bind and fix several guide pipes inside the reinforcing cage. Seal the bottom opening of the guide pipe and temporarily seal the top opening of the guide pipe. When the concrete is poured, bury the guide pipes together with the reinforcing cage inside the pile to be tested to prevent debris from entering the guide pipes during concrete pouring. The top of the guide pipe protrudes from the top surface of the concrete pouring. The length of the guide pipe is recorded as L.

[0020] Step 2: Before the formal test, connect the computer, roll assembly, data acquisition instrument, servo driver and guide device to a relatively flat ground next to the pile location of the pile to be tested, and collect the resistance R0 at both ends of the brush pin wire with the two brushes inside the guide device short-circuited.

[0021] Step 3: Several hours after the concrete pouring of the pile to be tested is completed, remove the temporary seal on the top of the guide pipe, adjust the orientation of the two infrared temperature sensors on the counterweight housing so that one of them faces the center of the pile to be tested, and slowly lower the guide roller guide groove on the counterweight housing to the bottom of the pile to be tested along the guide groove, and make the flat cable slack.

[0022] Step 4: Insert the flat cable into the through hole of the guide device along the vertical opening of the guide device at the top of the guide tube. Adjust the appropriate direction to embed the convex strip of the guide device into the guide tube. At the same time, adjust the position of the flat cable so that it is in the middle of the two brushes, and make the metal strips on both sides of the flat cable make smooth contact with the two brushes. The directional pulley provides certain constraints on the position of the flat cable.

[0023] Step 5: The computer controls the servo motor through the servo de-ener to drive the drum to rotate slowly to take in the cable until the flat cable is just taut. The resistance value Rm at both ends of the brush pin wire is collected.

[0024] Step 6: Set the data acquisition frequency on the computer and use the equidistant measurement and recording method. That is, within one measurement cycle, record temperature and depth information at certain intervals from the bottom of the pile to the top of the pile, and plot the temperature change curve with depth. Repeat the measurement cycle at certain intervals and plot the temperature change curve with time at various depths inside the pile until the temperature change curve with time at all depths reaches its maximum. Monitoring is then complete.

[0025] Formula ① is used to calculate the depth H of the pile body to be measured by the infrared temperature sensor. i :

[0026] Hi =L*(R) i -R0) / (R m -R0)

[0027] In the formula, R i For infrared temperature sensors at depth H i At the specified location, the data acquisition instrument collected the resistance at both ends of the brush signal pin line, where the average resistance per meter of the metal sheath was 0.5 * (R). m -R0) / L.

[0028] The beneficial effects of this invention are as follows: This invention allows for repeated measurements, avoiding the drawbacks of traditional disposable consumables (high cost and numerous sensors) and the high failure rate caused by easily damaged disposable consumables. Furthermore, it is highly operable, stable, reusable, economical, and environmentally friendly, effectively reducing the cost of pile defect detection based on hydration heat anomalies. Attached Figure Description

[0029] Figure 1 This is a schematic diagram illustrating the application of the present invention in a pile body;

[0030] Figure 2 This is a schematic diagram showing the connection between the flat cable and the temperature sensing component.

[0031] Figure 3 This is a schematic diagram of the three-dimensional structure of the guide tube from an uncommon perspective.

[0032] Figure 4 This is a schematic diagram of the cross-section of the guide tube;

[0033] Figure 5 This is one of the structural schematic diagrams of the guiding device;

[0034] Figure 6 This is one of the structural schematic diagrams of the guiding device;

[0035] Figure 7 This diagram illustrates the connection between the flat cable, the reel assembly, and the servo driver.

[0036] In the diagram, 1-Guiding device, 121-Outer shell, 122-Conduit, 123-Brush, 124-Brush pin, 125-Directional pulley, 2-Brush connection wire, 3-Data acquisition instrument, 4-Flat cable, 421-Metal sheath, 422-Signal transmission line, 5-Temperature measuring component, 521-Infrared temperature sensor, 522-Guide roller, 523-Counterweight shell, 6-Drum integration, 621-Drum, 622-Servo motor, 623-Encoder, 624-Signal line pin, 7-Servo starter, 8-Computer, 9-Guide tube, 921-Guide groove, 922-Guide column, 10-Pile to be tested, 11-Ground. Detailed Implementation

[0037] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0038] like Figures 1-7 As shown, a device for measuring the hydration heat and temperature of concrete inside a cast-in-place pile includes a drum assembly 6, a guide device 1, a guide tube 9, a flat cable 4, and a temperature measuring component 5. The drum assembly 6 is connected to one end of the flat cable 4 via the guide device 1. The other end of the flat cable 4 extends into the cavity of the guide tube 9 and is connected to the temperature measuring component 5, which is also located in the cavity of the guide tube 9. The flat cable 4 is arranged along the axial direction of the guide tube 9. The drum assembly 6 is used to raise and lower the temperature measuring component 5, and causes the temperature measuring component 5 to rise and fall along the axial direction of the guide tube 9. The guide tube 9 is installed in the pile body where the measuring device is used for measurement and is arranged along the axial direction of the pile body, so that the temperature measuring component 5 can measure the temperature at different height positions of the pile body during the up and down movement of the guide tube 9.

[0039] In actual use, the top of the pile is usually 11 cm above the ground, for example, 1110 cm above the ground.

[0040] In one optional embodiment, the roll assembly 6 includes a roll, a servo motor 622, an encoder 623, and signal line pins 624. One end of the flat cable 4 is wound around the roll, thereby connecting the flat cable 4 to the roll assembly 6. The flat cable 4 is electrically connected to the signal line pins 624. The output end of the servo motor 622 is connected to the roll, and the servo motor 622 is coaxially mounted with the roll to drive the roll to rotate in both directions. This drives the roll to rotate synchronously, thereby winding the flat cable 4. The servo motor 622 is also connected to the encoder 623, which is used to collect the rotation state of the servo motor 622.

[0041] The signal line pin 624 is positioned along the axis of the drum and exposed at one end of the drum.

[0042] In an optional implementation, the system further includes a data acquisition unit 3, a servo driver 7, and a computer 8. The data acquisition unit is electrically connected to a signal line pin 624 to acquire data transmitted via the flat cable 4. The data acquisition unit 3 is also connected to the computer 8 to upload the acquired data. The servo driver 7 is also connected to the computer 8, and the computer 8 controls the servo driver 7 to issue commands to drive the servo motor 622, thereby driving the servo motor 622 under the control of the servo driver 7, including controlling the rotation speed and reverse direction (forward or reverse). The encoder 623 acquires the rotation state of the servo motor 622 and sends it to the servo driver 7 to adjust the rotation speed and reverse direction of the servo motor 622 according to its current rotation state.

[0043] The flat cable 4 includes a metal sheath 421 and a signal transmission line 422 nested within the metal sheath 421. The metal sheath 421 is wound on a reel, and the signal transmission line 422 is electrically connected to a signal line pin 624. The other end of the signal transmission line 422 extends out of the metal sheath 421 and connects to the temperature sensing component 5. The metal sheath 421 extends into the temperature sensing component 5.

[0044] The temperature measuring component 5 includes a counterweight housing 523 with a cavity, an infrared temperature sensor 521 and a guide roller 522 mounted on the outer wall of the counterweight housing 523. One end of a flat cable 4 extends into the cavity of the counterweight housing 523, and a signal transmission line 422 extending from the soft sheath is electrically connected to the infrared temperature sensor 521 fixed on the outer wall of the counterweight housing 523. The guide roller 522 and the infrared temperature sensor 521 are spaced apart along the axial direction of the counterweight housing 523, with the guide roller 522 positioned at the top, i.e., mounted at the end of the housing near the top of the guide tube 9. The guide roller 522 is slidably connected to the guide tube 9, allowing the temperature measuring component 5 to slide along the axial direction of the guide tube 9 via the guide roller 522, i.e., to slide up and down along the guide tube 9.

[0045] In an optional embodiment, two infrared temperature sensors 521 are provided on the counterweight housing 523. The two infrared temperature sensors 521 are symmetrically mounted on the housing, such that one infrared temperature sensor 521 can measure in the direction of the pile axis, and the other infrared temperature sensor 521 can measure away from the pile axis.

[0046] The guide tube 9 includes a guide post 922 with a through hole and a guide groove 921 carved into the guide post 922. The guide groove 921 is arranged along the axial direction of the guide post 922 and is located on the side of the guide post 922 near the through hole, that is, on the inner wall of the guide post 922. The guide roller 522 is embedded in the guide groove 921, thereby realizing a directional sliding connection between the guide roller 522 and the guide groove 921, that is, the guide roller 522 can only slide along the axial direction of the guide groove 921.

[0047] In an optional embodiment, N sets of guide grooves 921 are provided on the guide post 922, where N is a non-zero natural number. Each set of guide grooves 921 includes two guide grooves 921. The two guide grooves 921 in the same set are symmetrically arranged on the guide post 922. Each guide groove 921 is arranged along the circumference of the guide shaft, that is, each guide groove 921 is arranged around the guide post 922 at intervals.

[0048] In an optional embodiment, M sets of guide rollers 522 are provided, where M is a non-zero natural number. Each set of guide rollers 522 includes two guide rollers 522. The two guide rollers 522 of the same set are symmetrically arranged on the counterweight housing 523. Each guide roller 522 is arranged along the circumference of the counterweight housing 523, that is, each guide roller 522 is arranged around the counterweight housing 523 at intervals. Each set of guide rollers 522 corresponds one-to-one with a guide groove 921, and the corresponding set of guide rollers 522 is embedded in the corresponding set of guide grooves 921.

[0049] For example, with M=1 and N=2, the counterweight housing 523 is equipped with two guide rollers 522, and the guide post 922 is equipped with four guide grooves 921. The two guide rollers 522 are respectively embedded in two guide grooves 921 of the same symmetrical arrangement. When it is necessary to measure the pile body in different directions, the two guide rollers 522 can be repositioned into two guide grooves 921 of another group under the action of external force, so that the infrared temperature sensor 521 on the counterweight housing 523 can measure the temperature in different directions of the pile body.

[0050] The guiding device 1 includes a housing 121, a conduit 122, a brush 123, brush pins 124, and a directional pulley 125. The housing 121 is fixedly mounted on the top end of the conduit 122, and the bottom end of the conduit 122 is mounted on a guide post 922. A flat cable 4 extends from the through hole of the conduit 122 and is wound around the directional pulley 125. The flat cable 4, extending from the directional pulley 125, is wound around a drum, and the signal transmission line 422 on the flat cable 4 is electrically in contact with one end of the brush 123. The other end of the brush 123 passes through the housing 121 and is mounted on the housing 121. A brush pin 124 is also provided on the end of the brush 123 exposed on the housing 121. The brush pin 124 is connected to the signal line pin 624, thereby connecting the signal transmission line 422 to the signal line pin 624. The directional pulley 125 is suspended on the housing 121 by a bracket, which is mounted on the housing 121.

[0051] In an alternative embodiment, the outer surface of the conduit 122 is provided with a protrusion that is embedded in a guide groove 921 mounted on the guide post 922, thereby allowing the conduit 122 to be slidably mounted on the guide post 922 (requiring external force, such as manual pressing or pulling).

[0052] Based on the aforementioned measuring device, this invention also provides a method for measuring the heat of hydration temperature of concrete inside a cast-in-place pile, comprising the following steps:

[0053] Step 1: During the binding of the reinforcing cage of the pile body 10 to be tested, install the actual number of measuring lines, i.e., the required positions, and bind and fix several guide pipes 9 inside the reinforcing cage. Seal the pipe opening at the bottom end of the guide pipe 9 and temporarily seal the pipe opening at the top end of the guide pipe 9. When the concrete is poured, bury the guide pipe 9 inside the pile body 10 to be tested along with the reinforcing cage to prevent debris from entering the guide pipe 9 during concrete pouring. The top end of the guide pipe 9 should protrude about 10 cm above the top surface of the concrete pouring. The length of the guide pipe 9 is recorded as L.

[0054] Step 2: Before the formal test, connect the computer 8, the roll assembly 6, the data acquisition instrument 3, the servo driver 7, and the guide device 1 to a relatively flat ground 11 next to the pile location of the pile to be tested 10. With the two brushes 123 inside the guide device 1 short-circuited, collect the resistance R0 at both ends of the wire of the brush pin 124.

[0055] Step 3: About 8 hours after the concrete pouring of the pile body 10 to be tested is completed, remove the temporary seal on the top of the guide groove pipe 9, adjust the orientation of the two infrared temperature sensors 521 on the counterweight housing 523 so that one of them faces the center (i.e., the axis) of the pile body 10 to be tested, and slowly lower the guide roller 522 on the counterweight housing 523 along the guide groove 921 to the bottom of the pile body 10 to be tested, and make the flat cable 4 in a slack state.

[0056] Step 4: Insert the flat cable 4 into the through hole of the guide device 1 along the vertical opening of the guide device 1 at the top of the guide tube 9. Adjust the appropriate direction to embed the protrusion of the guide device 1 into the guide tube 9. At the same time, adjust the position of the flat cable 4 so that it is in the middle of the two brushes 123, and make the metal strips on both sides of the flat cable 4 in smooth contact with the two brushes 123. The directional pulley 125 provides certain constraints on the position of the flat cable 4.

[0057] Step 5: The computer 8 controls the servo motor 622 through the servo de-energizer to drive the drum to rotate slowly to take in the wire until the flat cable 4 is just taut, and collects the resistance value Rm at both ends of the wire of the brush pin 124.

[0058] Step 6: Set the data acquisition frequency on computer 8. Generally, an equidistant measurement and recording method is used. That is, within one measurement cycle, temperature and depth information are recorded at certain intervals (e.g., 10 cm) from the bottom of the pile to the top, and the temperature change curve with depth is plotted. Repeat the next measurement cycle at a certain time interval (e.g., 10 minutes), and plot the temperature change curve with time at each depth position inside the pile until the temperature change curve with time at all depth positions reaches its highest point, and the monitoring is completed.

[0059] In an optional implementation, the infrared temperature sensor 521 at a depth H of 10 meters in the pile body to be measured is calculated using formula ①. i :

[0060] H i =L*(R) i -R0) / (R m -R0)

[0061] In the formula, R i For infrared temperature sensor 521 at depth H i At the specified location, data acquisition instrument 3 collected the resistance at both ends of the signal pin wire of brush 123, where the average resistance per meter of the metal soft skin 421 was 0.5 * (R). m -R0) / L.

[0062] The data collection method is as follows:

[0063] After step 5 is completed, the parameters are set in computer 8, including temperature and depth acquisition parameters (such as the acquisition interval distance s within one measurement cycle, the interval time t between two measurements, and the acquisition termination condition c), and servo motor 622 rotation parameters (such as rotation speed and rotation direction). The monitoring of the hydration heat temperature of the concrete inside the pile body 10 to be tested officially begins. The servo motor 622 operates according to the set parameters, and the data acquisition instrument 3 acquires data according to the set parameters.

[0064] After the probe completes one measurement cycle from the bottom of the pile to the top of the pile, the computer control program determines whether the acquisition termination condition c has been met.

[0065] If not, the servo motor 622 rotates in the opposite direction until the probe returns to the bottom of the pile. After waiting for the interval t, the next measurement cycle is repeated.

[0066] If so, send an alert message indicating that monitoring is complete.

[0067] This invention allows for repeated measurements, avoiding the drawbacks of traditional disposable consumables which are costly and require a large number of sensors. It also avoids the high failure rate caused by the easy damage of disposable consumables. Furthermore, it is highly operable, stable, reusable, economical, and environmentally friendly, effectively reducing the cost of pile defect detection based on hydration heat anomalies.

[0068] The embodiments disclosed in this specification are merely illustrative of one aspect of the invention, and the scope of protection of the invention is not limited to these embodiments. Any other functionally equivalent embodiments fall within the scope of protection of the invention. Those skilled in the art can make various other corresponding changes and modifications based on the technical solutions and concepts described above, and all such changes and modifications should fall within the scope of protection of the claims of this invention.

Claims

1. A device for measuring the heat of hydration temperature of concrete inside a cast-in-place pile, characterized in that, The device includes a reel assembly, a guide device, a guide tube, a flat cable, and a temperature measuring component. The reel assembly is connected to one end of the flat cable via the guide device. The other end of the flat cable extends into the cavity of the guide tube and connects to the temperature measuring component, which is also located within the cavity of the guide tube. The flat cable is arranged along the axial direction of the guide tube. The reel assembly is used to raise and lower the temperature measuring component, allowing it to move up and down along the axial direction of the guide tube. The guide tube is installed within the pile body used for measurement and is arranged along the axial direction of the pile body. This allows the temperature measuring component to measure the temperature at different heights of the pile body during its up-and-down movement along the guide tube. The guide tube includes a guide post with a through hole and a guide groove excavated in the guide post. The guide groove is arranged along the axial direction of the guide post and located on the side of the guide post closest to the through hole. A guide roller is embedded in the guide groove, thereby achieving a directional sliding connection between the guide roller and the guide groove. The guide post is provided with N sets of guide grooves, where N is a non-zero natural number. Each set of guide grooves includes two guide grooves, and the two guide grooves in the same set are symmetrically arranged on the guide post. Each guide groove is arranged along the circumference of the guide post. M sets of guide rollers are provided, where M is a non-zero natural number. Each set of guide rollers includes two guide rollers, which are symmetrically arranged on the counterweight housing. Each guide roller is arranged along the circumference of the counterweight housing. Each set of guide rollers corresponds one-to-one with a guide groove, and the corresponding set of guide rollers is embedded in the corresponding set of guide grooves. The flat cable includes a metal sheath and a signal transmission line nested within the metal sheath. The metal sheath is wound on a reel, and the signal transmission line is electrically connected to the signal line pins. The other end of the signal transmission line extends out of the metal sheath and connects to the temperature sensing component. The metal sheath extends into the temperature sensing component. The temperature measuring assembly includes a counterweight housing with a cavity, an infrared temperature sensor mounted on the outer wall of the counterweight housing, and a guide roller. One end of a flat cable extends into the cavity of the counterweight housing, and a signal transmission line extending from the metal sheath is electrically connected to the infrared temperature sensor fixed on the outer wall of the counterweight housing. The guide roller and the infrared temperature sensor are spaced apart along the axial direction of the counterweight housing, with the guide roller positioned at the top. The guide roller is slidably connected to a guide tube, allowing the temperature measuring assembly to slide along the axial direction of the guide tube via the guide roller. Two infrared temperature sensors are installed on the counterweight housing, symmetrically mounted such that one sensor measures towards the pile axis, while the other measures away from the pile axis. The guiding device includes a housing, a conduit, a brush, brush pins, and a directional pulley. The housing is fixedly mounted on the top of the conduit, and the bottom of the conduit is mounted on a guide post. A flat cable extends from the through-hole of the conduit and is wound around the directional pulley. A flat cable extending from the directional pulley is wound around a drum, and the signal transmission line on the flat cable is electrically in contact with one end of the brush. The other end of the brush passes through the housing and is mounted on the housing. Brush pins are also provided on the end of the brush exposed on the housing, and these brush pins are connected to signal line pins, thereby connecting the signal transmission line to the signal line pins. The directional pulley is suspended on the housing by a bracket, which is also mounted on the housing. The outer surface of the catheter is provided with a raised rib, which is embedded in a guide groove mounted on the guide post, thereby allowing the catheter to be slidably mounted on the guide post. Formula ① is used to calculate the depth H of the pile body to be measured by the infrared temperature sensor. i : H i =L (R i -R0) / (R m -R0) In the formula, R i For infrared temperature sensors at depth H i At the specified location, the data acquisition instrument measured the resistance at both ends of the brush signal pin wire, where the average resistance of the metal sheath was 0.5 per meter. (R m -R0) / L, where L represents the length of the guide tube, R m R0 represents the resistance value at both ends of the brush pin wire when the two brushes inside the guide device are short-circuited.

2. The device for measuring the heat of hydration of concrete inside a cast-in-place pile according to claim 1, characterized in that, The integrated reel includes a reel, a servo motor, an encoder, and signal line pins. One end of the flat cable is wound around the reel, thus connecting the flat cable to the reel. The flat cable is electrically connected to the signal line pins. The output end of the servo motor is connected to the reel, and the servo motor is coaxially mounted with the reel to drive the reel to rotate in both directions. This drives the reel to rotate synchronously and wind up the flat cable. The servo motor is also connected to the encoder, which is used to collect the rotation status of the servo motor.

3. The device for measuring the heat of hydration temperature of concrete inside a cast-in-place pile according to claim 2, characterized in that, The signal line pins are positioned along the axis of the drum and exposed at one end of the drum.

4. The device for measuring the heat of hydration of concrete inside a cast-in-place pile according to claim 2, characterized in that, It also includes a data acquisition unit, a servo driver, and a computer. The data acquisition unit is electrically connected to the signal line pins so that data transmitted via the flat cable can be acquired through the signal line pins. The data acquisition unit is also connected to the computer so that the acquired data can be uploaded to the computer. The servo driver is also connected to the computer. The computer controls the servo driver to issue commands to drive the servo motor so that the servo motor is driven under the control of the servo driver, including controlling the rotation speed and reverse direction of the servo motor. The encoder acquires the rotation state of the servo motor and sends it to the servo driver so that the rotation speed and reverse direction of the servo motor can be adjusted according to the current rotation state of the servo motor.

5. A method for measuring the heat of hydration temperature of concrete inside a cast-in-place pile, applied to the measuring device as described in any one of claims 1-4, comprising the following steps: Step 1: During the binding of the reinforcing cage of the pile to be tested, according to the actual number and location requirements of the measuring lines, bind and fix several guide pipes on the inside of the reinforcing cage, seal the bottom opening of the guide pipe, and temporarily seal the top opening of the guide pipe. When the concrete is poured, bury the guide pipe along with the reinforcing cage inside the pile to be tested to prevent debris from entering the guide pipe during concrete pouring. The top of the guide pipe protrudes from the top surface of the concrete pouring. The length of the guide pipe is recorded as L. Step 2: Before the formal test, connect the computer, roll assembly, data acquisition instrument, servo driver and guide device to a relatively flat ground next to the pile location of the pile to be tested, and collect the resistance R0 at both ends of the brush pin wire with the two brushes inside the guide device short-circuited. Step 3: Several hours after the concrete pouring of the pile to be tested is completed, remove the temporary seal on the top of the guide channel pipe, adjust the orientation of the two infrared temperature sensors on the counterweight housing so that one of them faces the center of the pile to be tested, and slowly lower the guide roller on the counterweight housing along the guide channel to the bottom of the pile to be tested, and make the flat cable slack. Step 4: Insert the flat cable into the through hole of the guide device along the vertical opening of the guide device at the top of the guide tube. Adjust the appropriate direction to embed the convex strip of the guide device into the guide tube. At the same time, adjust the position of the flat cable so that it is in the middle of the two brushes, and make the metal strips on both sides of the flat cable make smooth contact with the two brushes. The directional pulley provides certain constraints on the position of the flat cable. Step 5: The computer controls the servo motor through the servo driver to drive the drum to rotate slowly to take in the cable until the flat cable is just taut, and collect the resistance value Rm at both ends of the brush pin wire. Step 6: Set the data acquisition frequency on the computer and use the equidistant measurement and recording method. That is, within one measurement cycle, record temperature and depth information at certain intervals from the bottom of the pile to the top of the pile, and plot the temperature change curve with depth. Repeat the measurement cycle at certain intervals and plot the temperature change curve with time at various depths inside the pile until the temperature change curve with time at all depths reaches its maximum. Monitoring is then complete. in, Formula ① is used to calculate the depth H of the pile body to be measured by the infrared temperature sensor. i : H i =L (R i -R0) / (R m -R0) In the formula, R i For infrared temperature sensors at depth H i At the specified location, the data acquisition instrument measured the resistance at both ends of the brush signal pin wire, where the average resistance of the metal sheath was 0.5 per meter. (R m -R0) / L.

Images