A device and method for detecting integrity of a cast-in-place pile based on hydration heat method

Abstract

The application discloses a kind of based on hydration heat method's bored pile body integrity detection device and method, including integrity tester, temperature sensing cable and test tube;Temperature sensor is equipped on the temperature sensing cable;The test tube is assembled by several heat-conducting connectors and connecting pipes, and the inner wall of heat-conducting connector is equipped with positioning platform seat;Positioning magnetic block is equipped on the positioning platform seat;The temperature sensor includes seat body and temperature sensing element, and the temperature sensing element is movably connected in the guide hole of seat body by guide rod;The seat body front is equipped with accommodating groove and permanent magnet;The temperature sensing element is placed in accommodating groove;Spring is equipped on the guide rod, and the spring is placed between temperature sensing element and seat plate.The application provides a kind of based on hydration heat method's bored pile body integrity detection device and method, easy to assemble, convenient to construct, and temperature sensing cable and temperature sensor can be recycled in detection process, reuse, greatly save the detection cost of construction.

Description

TECHNICAL FIELD

[0001] The present application relates to the pile foundation engineering technology and geotechnical testing technical field, and particularly relates to a bored pile body integrity detection device and method based on hydration heat method. BACKGROUND

[0002] The bored pile has a wide application in many house buildings and municipal projects due to its high bearing capacity. Meanwhile, the bored pile is formed on site, and the concrete is poured, so that the construction process is complex, and there are many uncertain factors. If any link goes wrong, the pile forming quality will be affected, and then the long-term bearing capacity and service life of the pile body are affected. Therefore, the quality control and detection of the bored pile are very important. The main detection methods of the bored pile body integrity include the low-strain pile body integrity detection, the acoustic wave transmission method pile body integrity detection, the core drilling method detection and the high-strain method detection. However, the above methods have advantages and disadvantages, and the most commonly used bored pile body integrity detection technology based on the concrete hydration heat is now.

[0003] The bored pile body integrity detection technology based on the concrete hydration heat is a method for evaluating and analyzing the integrity and the profile size of the pile body by using the principle of the concrete hydration heat release in the cement solidification process, pre-burying the temperature measurement cable in the pile body, measuring and recording the temperature change of each part of the pile body along the depth direction, and then according to the temperature change of each part of the pile body. It is a relatively mature existing technology, but in the conventional construction process, the temperature sensing cable is usually tied on the steel reinforcement, and the concrete is poured. In the concrete pouring process, the temperature sensor tied on the steel reinforcement cage will be disturbed to different degrees. In serious cases, the temperature sensing cable and the temperature sensor will be damaged and cannot work normally, thereby affecting the detection progress and results. Moreover, after the detection task is completed, the temperature sensing cable and the temperature sensor cannot be taken out, which greatly increases the detection cost and causes the waste of resources. SUMMARY

[0004] In order to overcome the above-mentioned deficiencies of the prior art, the present application provides a bored pile body integrity detection device and method based on the hydration heat method, which is convenient to assemble, convenient to construct, and can recycle the temperature sensing cable and the temperature sensor in the detection process, thereby greatly saving the detection cost of the construction.

[0005] The present application is realized by the following technical solutions:

[0006] The application discloses a device for detecting the integrity of a cast-in-place pile based on a hydration heat method, which comprises an integrity tester, a temperature sensing cable and at least one test pipe for pre-burial; at least one temperature sensor is arranged on the temperature sensing cable; the test pipe is assembled by a plurality of heat-conducting connectors and connecting pipes; the heat-conducting connectors and the connecting pipes are detachably connected; a positioning platform seat is arranged on the inner wall of the heat-conducting connector; a positioning magnetic block is arranged on the positioning platform seat; the temperature sensor comprises a seat body and a temperature sensing element; the temperature sensing element is movably connected in the guide hole of the seat body through a guide rod; a containing groove and a permanent magnet are arranged on the front face of the seat body; the permanent magnet is embedded in the seat body outside the containing groove; the temperature sensing element is arranged in the containing groove; a spring is arranged on the guide rod and arranged between the temperature sensing element and the seat body, and used for providing a restoring force; the test pipe is pre-buried in concrete, the temperature sensor on the temperature sensing cable is adsorbed on the positioning platform seat through the magnetic force of the permanent magnet, the temperature sensing cable and the temperature sensor can be recycled after the test is completed, the detection cost of construction is greatly saved, the heat-conducting connectors and the connecting pipes can be made into standard parts, the structure is simple, the on-site assembly is convenient, the equidistant arrangement of the heat-conducting connectors on the test pipe can be ensured after the assembly is completed, the connecting pipe is made of a poor conductor, preferably a transparent plastic pipe, and is used for connecting the heat-conducting connectors and guiding and protecting the temperature sensing cable; the positioning platform seat is arranged on the inner wall of the heat-conducting connector, and provides a reliable reference for the positioning and fixing of the temperature sensor; the temperature sensor is adsorbed on the positioning platform seat through the permanent magnet, is fixed firmly and stably, and is convenient to disassemble in the later period; the temperature sensing element is arranged in the containing groove on the positioning platform seat, the spring is arranged on the guide rod and between the temperature sensing element and the seat body, and is used for providing a restoring force; the guide rod and the spring make the temperature sensing element adopt a floating mode to be connected in the seat body, after the temperature sensing element is fixed on the positioning platform seat, the temperature sensing element can be better in contact with the positioning platform seat under the action force of the spring, the reliability and accuracy of detection can be ensured, and hard collision between the temperature sensing element and the positioning platform seat in the process of contact can be prevented, and the temperature sensing element can be prevented from being damaged.

[0007] Preferably, the temperature sensing element is fixed at the top end of the guide rod, and the tail part of the guide rod is provided with an adjusting nut; the tail part of the guide rod is provided with a thread, the adjusting nut plays a limiting role on the guide rod, prevents the guide rod from falling off from the seat body, the tension of the spring can be controlled by rotating the adjusting nut, the pre-tightening force of the spring between the temperature sensing element and the seat body can be ensured, and the guide rod and the temperature sensing element can be prevented from freely sliding in the seat body.

[0008] Preferably, the positioning platform is provided with a positioning slot, and the positioning magnetic block is fixed in the positioning slot; the positioning slot is matched with the head structure of the temperature sensor, and under the magnetic force of the positioning magnetic block and the permanent magnet, the head of the temperature sensor is fixed in the positioning slot, so that the fixation of the temperature sensor is more accurate, and the reliability of the test is ensured.

[0009] Preferably, the positioning slot is in a circular structure, and the positioning magnetic block is in a circular disc structure and is built in the bottom of the positioning slot; the positioning slot is in a circular structure, so that the processing is convenient and the manufacturing cost is low.

[0010] Preferably, the opening of the positioning slot is in a wedge structure; the opening diameter of the wedge structure is gradually reduced, the head structure of the temperature sensor is also in a wedge structure, the temperature sensor can be conveniently introduced, and accurate positioning is realized.

[0011] Preferably, the heat-conducting connector and the connecting pipe are connected through threads; the processing is simple, the connection is fast, and the reliability is high.

[0012] Preferably, the heat-conducting connector is provided with a positioning shoulder at the upper and lower openings; the installation precision of the connecting rod on the heat-conducting connector is ensured, the heat-conducting connectors on the test pipe are arranged at equal distances after assembly, the subsequent detection data is conveniently arranged and analyzed, and the reliability of the detection is ensured.

[0013] Preferably, the heat-conducting connector is made of ceramic material; the ceramic material has high strength, more importantly, has high thermal conductivity and does not have magnetic conductivity, so that the positioning of the temperature sensor is not disturbed.

[0014] Preferably, the connecting pipe is made of a poor conductor; the interference between the heat-conducting connectors on the test pipe through the heat conduction of the connecting pipe is prevented, and the accuracy of the test result is further ensured.

[0015] A kind of hydration heat-based bored pile body integrity detection method for pouring, utilize the above-mentioned any hydration heat-based bored pile body integrity detection device for pouring, specifically includes: first, according to the length of reinforcement cage on site, select a number of heat-conducting connectors and connecting pipes;Second, according to the length of reinforcement cage on site, install a number of temperature sensors on temperature sensing cable;Third, heat-conducting connectors and connecting pipes are successively sleeved on temperature sensing cable, after determining that temperature sensor is fixed on positioning platform seat by observation, then heat-conducting connectors and connecting pipes are assembled, form complete test tube;Fourth, the bottom of test tube is blocked, top and temperature sensing cable are tied and fixed, and test tube is tied on reinforcement cage along the axial direction of reinforcement cage;Fifth, reinforcement cage is placed in bored pile hole, and after temperature sensing cable and integrity tester are communicated, concrete is poured, the temperature values of each temperature sensor on temperature sensing cable are collected during the curing process of bored pile body, and data record, display and analysis are carried out.

[0016] The beneficial effects of the present application are: 1, the test tube is embedded in the concrete, the temperature sensor on the temperature sensing cable is adsorbed on the positioning platform seat by the magnetic force of the permanent magnet, after completing the test work, the temperature sensing cable and the temperature sensor can be recycled, which greatly saves the detection cost of construction;2, the positioning groove provided on the positioning platform seat is matched with the head structure of the temperature sensor, under the magnetic force action of the positioning magnetic block and the permanent magnet, the head of the temperature sensor is fixed in the positioning groove, so that the temperature sensor is fixed more accurately, and the reliability of the test is guaranteed;3, the test tube is assembled in a splicing manner, the on-site construction is fast and convenient, the heat-conducting connector is made of ceramic material, which has high strength and strong heat conductivity, and does not have magnetic property, which will not interfere with the positioning of the temperature sensor;4, the structural features provided on the heat-conducting connector can ensure the accurate positioning of the temperature sensor, and further ensure the reliability of the detection. BRIEF DESCRIPTION OF DRAWINGS

[0017] Fig. 1 It is a schematic view of a hydration heat-based bored pile body integrity detection device for pouring described in embodiment one;

[0018] Fig. 2 It is an installation structure schematic view of test tube and temperature sensing cable described in embodiment one;

[0019] Fig. 3 It is a structural schematic view of heat-conducting connector described in embodiment one;

[0020] Fig. 4 It is a structural schematic view of connecting pipe described in embodiment one;

[0021] Fig. 5 It is a top view schematic view of temperature sensor and temperature sensing cable installation structure described in embodiment one.

[0022] Fig. 6 The side view schematic diagram of the installation structure of the temperature sensor and temperature sensing cable in Example 1;

[0023] Fig. 7 The structural schematic diagram of the temperature sensor in Example 1;

[0024] In the figure: 1, integrity tester; 2, test pipe; 21, heat-conducting connector; 211, positioning platform seat; 212, positioning shoulder; 213, threaded part; 214, positioning groove; 215, positioning magnetically conductive block; 22, connecting pipe; 3, pile body of cast-in-place pile; 4, temperature sensing cable; 41, temperature sensor; 411, seat body; 412, temperature sensing element; 413, guide rod; 414, spring; 415, adjusting nut; 416, permanent magnet; 417, cap; 418, accommodating groove; 42, cable quick connector. DETAILED DESCRIPTION

[0025] The technical solutions of the embodiments of the present application will be described clearly and completely in combination with the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0026] Example 1

[0027] As Figs. 1-7As shown, a kind of hydration heat method-based pile integrity detection device of cast-in-place pile, including integrity tester 1, temperature sensing cable 4 and at least one test pipe 2 for pre-buried;At least one temperature sensor 41 is provided on the temperature sensing cable 4;The test pipe 2 is assembled by several heat-conducting connectors 21 and connecting pipes 22, the heat-conducting connector 21 is detachably connected with the connecting pipe 22, specifically, threaded connection can be used, the upper and lower ends of the heat-conducting connector 21 are provided with threaded parts 213, and the upper and lower ends of the connecting pipe 22 are adapted thereto;Positioning platform seat 211 is provided on the inner wall of the heat-conducting connector 21;Positioning magnetic block 215 is provided on the positioning platform seat 211, which can be made of magnetic material, specifically made of silicon steel sheet;The temperature sensor 41 includes seat body 411 and temperature sensing element 412, the temperature sensing element 412 is movably connected in the guide hole of the seat body 411 by guide rod 413;The front of the seat body 411 is provided with accommodating groove 418 and permanent magnet 416;The permanent magnet 416 is embedded in the seat body 411 and located outside the accommodating groove 418;The temperature sensing element 412 is placed in the accommodating groove 418;Spring 414 is provided on the guide rod 413, and the spring 414 is placed between the temperature sensing element 412 and the seat body 411 to provide restoring force;The back of the seat body 411 is provided with cap 417 to ensure the movement space of the guide rod 413 and to protect the connection signal lead;The test pipe 2 is pre-buried in concrete, and the temperature sensor 41 on the temperature sensing cable 4 is adsorbed on the positioning platform seat 211 by the magnetic force of the permanent magnet 416, after the test is completed, the temperature sensing cable and the temperature sensor can be recycled, which greatly saves the detection cost of construction;The test pipe 2 is assembled by several heat-conducting connectors 21 and connecting pipes 22, and the heat-conducting connector 21 and the connecting pipe 22 can be made into standard parts, which are simple in structure and convenient to assemble on site, and after assembly is completed, the heat-conducting connectors 21 on the test pipe 2 can be arranged equidistantly, specifically, according to the commonly used specifications of construction;Preferably, the length of the heat-conducting connector 21 is 50mm, and the length of the connecting pipe 22 is 500mm;The connecting pipe 22 is made of poor conductor, preferably transparent plastic pipe, which is used for connecting the heat-conducting connector 21 and guiding and protecting the temperature sensing cable 4;The inner wall of the heat-conducting connector 21 is provided with the positioning platform seat 211, which provides a reliable reference for positioning and fixing of the temperature sensor 41;The temperature sensor 41 is adsorbed on the positioning platform seat by the permanent magnet 416, which is fixed firmly and stably, and is convenient to disassemble later.The temperature sensing element 412 is placed in the accommodating groove 418 on the positioning platform base 211, the guide rod 413 is provided with the spring 414, the spring 414 is placed between the temperature sensing element 412 and the base body 411, and the spring 414 is used for providing a restoring force; the guide rod 413 and the spring 414 enable the temperature sensing element 412 to be connected in the base body 411 in a floating manner; after the temperature sensing element 412 is fixed on the positioning platform base 211, the temperature sensing element 412 can be guaranteed to be in better contact with the positioning platform base 211 under the action force of the spring 414, the reliability and accuracy of detection are guaranteed, and hard collision between the temperature sensing element 412 and the positioning platform base 211 during contact can be prevented, and the temperature sensing element 412 is prevented from being damaged.

[0028] Preferably, the temperature sensing element 412 is fixed at the top end of the guide rod 413, the tail part of the guide rod 413 is provided with the adjusting nut 415, the tail part of the guide rod 413 is provided with threads, the adjusting nut 415 can play a limiting role on the guide rod 413, and the adjusting nut 415 is prevented from falling off from the base body 411; the adjusting nut 415 is fixed on the threaded part of the guide rod 413, the tension of the spring 414 can be controlled by rotating the adjusting nut 415, the spring tension between the temperature sensing element 412 and the base body 411 is guaranteed, and the guide rod 413 and the temperature sensing element 412 are prevented from freely sliding in the base body 411; the positioning platform base 211 is provided with the positioning groove 214, the positioning magnetic block 215 is fixed in the positioning groove 214, the positioning groove 214 is matched with the head structure of the temperature sensor 41, the temperature sensor 41 is fixed in the positioning groove 214 under the magnetic force of the positioning magnetic block 215 and the permanent magnet 416, the temperature sensor 41 is more accurately fixed, and the reliability of testing is guaranteed; further, the positioning groove 214 has a circular structure; the positioning magnetic block 215 has a circular disc structure and is built in the bottom of the positioning groove 214; the opening of the positioning groove 214 has a wedge structure, the opening diameter of the wedge structure gradually decreases, and the head structure of the temperature sensor 41 also has a wedge structure, the temperature sensor can be conveniently introduced, and accurate positioning is realized; the upper and lower openings of the heat conduction connector 21 are both provided with the positioning shoulder 212, so as to guarantee the installation accuracy of the connecting pipe 22 on the heat conduction connector 21, the heat conduction connectors 21 on the assembled test pipe 2 are arranged at equal distances, subsequent detection data is conveniently arranged and analyzed, and the reliability of detection is guaranteed; the heat conduction connector 21 is made of ceramic material, the ceramic material has high strength, more importantly, has strong heat conductivity, and does not have magnetic conductivity, so as not to interfere with the positioning of the temperature sensor 41.

[0029] Embodiment two

[0030] A kind of hydration heat-based bored pile body integrity detection method for utilizing any one of hydration heat-based bored pile body integrity detection device in above-described embodiment, specifically includes: first, according to the length of reinforcement cage in place, select a number of heat-conducting connector 21 and connecting pipe 22, the heat-conducting connector 21 and connecting pipe 22 are prefabricated standard parts, heat-conducting connector 21 length is 50mm, connecting pipe 22 length is 500mm;Second, according to the length of reinforcement cage in place, install a number of temperature sensors 41 on temperature sensing cable 4, every 500mm interval on the temperature sensing cable is equipped with the connecting lead of one temperature sensor 41, the length of connecting lead is 100mm, and cable quick connector 42 is equipped at the end of connecting lead;Third, heat-conducting connector 21 and connecting pipe 22 are successively sleeved on temperature sensing cable 4, after determining that temperature sensor 41 is fixed in the positioning groove 214 of positioning platform seat 211 by observation, then heat-conducting connector 21 and connecting pipe 22 are assembled, and the spacing between each heat-conducting connector 21 is checked and determined by ruler, after approval is completed, complete test tube 2 is formed;Fourth, the bottom of test tube 2 is blocked, and the top is bound and fixed with temperature sensing cable 4, to prevent temperature sensing cable 4 in test tube 2 section from shaking during the inspection process, affect the detection result of temperature sensor 41, finally test tube 2 is bound on reinforcement cage along the axial direction of reinforcement cage;Fifth, reinforcement cage is placed in bored pile hole, and after temperature sensing cable 4 is communicated with integrity tester 1, concrete is poured, at each time period in the curing process of bored pile body 3, integrity tester 1 collects the temperature value of each temperature sensor 41 on temperature sensing cable 4, and carries out data record, display and analysis.

[0031] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them;Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features;And these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the embodiments of the present application.

Claims

1. A device for detecting the integrity of cast-in-place piles based on the heat of hydration method, characterized in that: The device includes an integrity tester, a temperature-sensing cable, and at least one test tube for pre-embedding. The temperature-sensing cable is equipped with at least one temperature sensor. The test tube is assembled from several thermally conductive connectors and connecting pipes, with the thermally conductive connectors detachably connected to the connecting pipes. A positioning platform seat is provided on the inner wall of each thermally conductive connector. A positioning magnetic block is provided on the positioning platform seat. The temperature sensor includes a base and a temperature-sensing element, which is movably connected to a guide hole in the base via a guide rod. The front of the base has a receiving groove and a permanent magnet. The permanent magnet is located outside the receiving groove and embedded within the base. The temperature-sensing element is placed in the receiving groove. A spring is provided on the guide rod, positioned between the temperature-sensing element and the base to provide a restoring force.

2. The pile integrity testing device based on the hydration heat method according to claim 1, characterized in that: The temperature sensing element is fixed to the top of the guide rod, and the tail of the guide rod is provided with an adjusting nut.

3. The pile integrity testing device based on the hydration heat method according to claim 1, characterized in that: The positioning platform base is provided with a positioning groove, and the positioning magnetic block is fixed in the positioning groove.

4. The pile integrity testing device based on the hydration heat method according to claim 3, characterized in that: The positioning groove has a circular structure; the positioning magnetic block has a circular disk-shaped structure and is built into the bottom of the positioning groove.

5. The pile integrity testing device based on the hydration heat method according to claim 3, characterized in that: The opening of the positioning groove has a wedge-shaped structure.

6. The pile integrity testing device based on the hydration heat method according to claim 1, characterized in that: The heat-conducting connector and the connecting pipe are connected by threads.

7. The pile integrity testing device based on the hydration heat method according to claim 1, characterized in that: The heat-conducting connector has positioning shoulders at both the upper and lower openings.

8. The pile integrity testing device based on the hydration heat method according to claim 1, characterized in that: The thermally conductive connector is made of ceramic material.

9. The pile integrity testing device based on the hydration heat method according to claim 1, characterized in that: The connecting pipe is made of a poor conductor of heat.

10. A method for detecting the integrity of cast-in-place piles based on the heat of hydration method, characterized in that: The integrity testing device for cast-in-place piles based on the hydration heat method, according to any one of claims 1 to 9, specifically includes: First, selecting a number of thermally conductive connectors and connecting pipes according to the length of the on-site reinforcing cage; Second, installing a number of temperature sensors on the temperature-sensing cable according to the length of the on-site reinforcing cage; Third, sequentially connecting the thermally conductive connectors and connecting pipes to the temperature-sensing cable, and after observing and confirming that the temperature sensors are fixed on the positioning platform, assembling the thermally conductive connectors and connecting pipes to form a complete test tube; Fourth, sealing the bottom of the test tube, binding and fixing the top to the temperature-sensing cable, and binding the test tube to the reinforcing cage along the axial direction of the reinforcing cage; Fifth, placing the reinforcing cage in the pile hole, and after connecting the temperature-sensing cable to the integrity tester, pouring concrete, collecting the temperature values ​​of each temperature sensor on the temperature-sensing cable during the solidification process of the cast-in-place pile, and recording, displaying, and analyzing the data.

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