CN210031928U - Prestressed concrete hollow pile length and pile extension quality detection device - Google Patents
Prestressed concrete hollow pile length and pile extension quality detection device Download PDFInfo
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- CN210031928U CN210031928U CN201920445770.5U CN201920445770U CN210031928U CN 210031928 U CN210031928 U CN 210031928U CN 201920445770 U CN201920445770 U CN 201920445770U CN 210031928 U CN210031928 U CN 210031928U
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Abstract
The utility model discloses a long and pile extension quality detection device of prestressed concrete hollow pile, including being located subaerial detecting instrument, cable winch, hollow pile, detecting instrument passes through the cable electricity with the cable winch and is connected, still includes counter, the fixed lid of direction, the interior sensor of stake, the counter electricity is connected in detecting instrument and is fixed in the fixed lid of direction, hollow pile top portion is located to the fixed lid of direction, the interior sensor of stake passes through the cable and is connected with the detecting instrument electricity. By the utility model discloses the structure can know, through in the stake sensor in time with hollow pile bottom or inside measuring arm inclination, the gyro wheel speed of rotation that detects pass to detecting instrument, reunion counter passes to the speed of drawing of cable in the detecting instrument, judges stake bottom position to calculate the stake length, and the analysis pile extension quality, overall structure is simple, easy operation, measurement of efficiency is higher and the precision is high.
Description
Technical Field
The utility model belongs to the technical field of the building engineering technique and specifically relates to a long and pile extension quality detection device of prestressed concrete hollow pile.
Background
With the vigorous development of the engineering construction industry in China, the proportion of the prestressed concrete hollow pile foundation in the foundation form is higher and higher. The prestressed concrete hollow pile is a hollow long concrete prefabricated component, mainly composed of concrete, reinforcing steel bar and end plate, and its pile end bearing layer is made of clay, sand and silt, so that it has the advantages of high bearing capacity, low cost, quick construction speed, good driving resistance and high pile-forming quality, and can be extensively used in soft soil geological condition. The bearing capacity of the prestressed concrete hollow pile is composed of pile side friction and pile end resistance, and the construction pile length is important for the development of the pile side friction and the pile end resistance. In order to ensure the construction quality and safety of the project, the pile length needs to be detected, and whether the construction pile length is consistent with the designed pile length or not is judged. When the designed pile length is longer, a plurality of sections of piles are adopted to form the designed pile length. Common connection modes of the multi-section piles are welding, flange connection and mechanical quick connection. In the construction process, the joints are broken, dislocated and disjointed due to hammering pressure stress, hammering tensile stress and soil body upwelling, and the vertical bearing capacity and the horizontal bearing capacity of the pile are affected.
At present, the construction pile length detection method comprises a low strain method, a high strain method, a magnetic logging method, an in-hole camera shooting method and the like. The low-strain method has the defects that a detection instrument cannot detect a pile bottom signal (an ultra-long pile in a soft soil area has a large length-diameter ratio, large soil constraint around the pile, rapid stress wave attenuation, good matching between the pile body impedance and the bearing layer impedance, and the influence of a joint gap of a precast pile), so that the pile length cannot be effectively detected. The high strain method has the disadvantages of requiring multiple persons to cooperate with large machinery and high cost. The magnetic logging method has the defects that in the construction process of the prestressed concrete hollow pile, if the pile is exploded, the length of prestressed reinforcement of a pile body is inconsistent with the length of a pile, and the measured length of the prestressed reinforcement is not equal to the length of the pile; in the area with large change of the underground magnetic field (basalt, construction waste and small pile spacing), the magnetic detection detector can be obviously interfered to influence data analysis and judgment. The in-hole camera shooting method has the defects of difficult focusing, image distortion and difficult resolution of underwater images.
The pile splicing quality detection method comprises a low-strain method, a high-strain method and an in-hole camera shooting method. The low strain method has a disadvantage that when the prestressed concrete hollow pile has two or more joints, it is difficult to detect the pile extension quality of all the joints. The high strain method has the disadvantages of requiring multiple persons to cooperate with large machinery and high cost. The in-hole camera shooting method has the defects of difficult focusing, image distortion and difficult resolution of underwater images.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a long and pile extension quality detection device of prestressed concrete hollow pile overcomes prior art's defect, solves detecting instrument and can't survey the pile bottom signal, leads to unable effective detection pile long, and the check out test set cost is high, the detection data is inaccurate, disturbed the problem, has solved the difficult problem that detects, the check out test set cost is high of pile joint quality simultaneously.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the device for detecting the length of the prestressed concrete hollow pile and the pile extension quality comprises a detection instrument, a cable winch and the hollow pile, wherein the detection instrument, the cable winch and the hollow pile are located on the ground, the detection instrument is electrically connected with the cable winch through a cable, the device further comprises a counter, a guide fixing cover and a pile inner sensor, the counter is electrically connected to the detection instrument and is fixed on the guide fixing cover, the guide fixing cover is arranged at the top of the hollow pile, and the pile inner sensor is electrically connected with the detection instrument through a cable.
Furthermore, the guide fixing cover is divided into an upper cover and a side ring sleeve, a cable through hole is formed in the center of the upper cover, and a locking screw is arranged on the side ring sleeve to fix the guide fixing cover on the top of the hollow pile;
one end of the cable is connected to the top of the sensor in the pile, and the other end of the cable penetrates through the cable through hole, bypasses the counter wheel disc, is wound on the cable winch and is finally electrically connected with the detection instrument.
Further, the vertical center line of the upper cover is tangent to the outer edge of the counter wheel disc.
Furthermore, the sensor in the pile consists of a sealing column, a round rod, a pressure spring, a measuring arm, an inclination angle sensor, a speed sensor, an electromagnet and a roller wheel, wherein a cable socket is arranged at the top of the sealing column and connected with a cable joint, the round rod is arranged at the bottom of the sealing column, the radius of the round rod is smaller than that of the sealing column, and the concentric connecting ends of the sealing column and the round rod form an annular inverted platform;
the outer side wall of the lower part of the sealing column is provided with three arm measuring grooves, and the arm measuring grooves extend to penetrate through the annular inversion platform and trisect the annular inversion platform;
the inner parts of the sealing column and the round rod are provided with concentric hollow wire holes, three spring inner cavities are arranged between the lower side wall of the wire hole and the outer side wall of the sealing column, the spring inner cavities are positioned right above the arm measuring groove and are communicated in a matching way, the upper end of the measuring arm is rotatably connected between the two opposite side walls of the arm measuring groove through a rotating shaft, and a pressure spring is arranged between the top of the measuring arm and the top wall of the spring inner cavity;
the side wall of the upper part of the measuring arm is provided with an inclination angle sensor;
the bottom end of the measuring arm is provided with a roller which vertically rotates along the length direction of the round rod;
a speed sensor is arranged on the side wall of the bottom end of the measuring arm and is positioned beside the roller;
and the outer surface of the middle part of the round rod is provided with three electromagnets, and the electromagnets and the measuring arm groove are positioned on the same vertical plane and are respectively matched with the measuring arm correspondingly.
Furthermore, the inclination angle sensor, the speed sensor and the electromagnets are connected with the cable socket through leads, and when the electromagnets are electrified, the three measuring arms are adsorbed on the corresponding three electromagnets at the same time; when the electromagnet is powered off, the three measuring arms are simultaneously and outwards propped open under the elastic force of the pressure spring.
Furthermore, the central position of the electromagnet is provided with a measuring arm limiting groove which is matched with the measuring arm.
Furthermore, the hollow pile is divided into two sections, and a pile joint is arranged in the middle of the hollow pile.
(II) the detection method of the prestressed concrete hollow pile length and pile extension quality detection device comprises the following steps:
step 1: drilling holes in the prestressed concrete hollow pile by using a drilling machine, removing soil mass gushing into the pipe and soil mass with a certain depth downwards from the end of the hollow pile in the pile sinking process, wherein the drilling depth exceeds the designed pile length of the prestressed concrete hollow pile by 1.5-2 m;
step 2: fixing a counter on the upper part of the guide fixing cover, and enabling the outer edge of a wheel disc of the counter to be tangent to the vertical central line of the upper cover, so as to ensure that the direction of pulling the cable is vertical upwards or downwards;
and step 3: one end of the cable, which is tied with the sensor in the pile, bypasses the counter wheel disc and is placed into the cable through hole, the sensor in the pile is placed downwards, when the cable is loosened, namely the sensor in the pile is placed to the bottom of the drilled hole, the cable is stopped to be placed downwards, and in the whole process, the electromagnet is electrified, and the measuring arm is adsorbed in the measuring arm limiting groove;
and 4, step 4: the electromagnet is powered off, the measuring arm is squeezed by spring force to be propped open all around, the cable winch is shaken manually to pull the cable upwards slowly, the moving distance of the cable is transmitted to a detecting instrument in real time through a counter, the detecting instrument processes the moving distance of the cable and data transmitted back by a sensor in the pile, a depth-dip angle graph and a depth-rotating speed graph are drawn, and when the pile end is met, the dip angle and the rotating speed are suddenly changed, so that the construction pile length of the prestressed concrete hollow pile can be obtained;
and 5: when the sensor in the pile enters the hollow pile, the cable is continuously and slowly pulled upwards, and when the roller meets a good pile joint, the inclination angle and the speed of the roller are hardly changed; when the pile joint part is loosened, locally dislocated and the pile head is broken, the inclination angle and the cable pulling-up speed are suddenly changed, so that the pile splicing quality of the prestressed concrete hollow pile can be obtained.
Compared with the prior art, the beneficial effects of the utility model are that:
one, the utility model provides a long and pile extension quality detection device of prestressed concrete hollow pile, hollow pile top portion is located to the fixed lid of direction, and upper cover center department is equipped with the cable through-hole on it, when guaranteeing that the interior sensor of stake rises or descends, and the cable draws and gets the direction and be the vertical direction in center all the time.
Two, the utility model provides a long and pile extension quality detection device of prestressed concrete hollow pile, the vertical central line of upper cover is tangent with the counter rim plate outside, guarantees that the cable rises or draws and gets in vertical direction, reduces the cable and draws the frictional force who gets in-process and cable through-hole lateral wall, avoids drawing or drawing the side because of drawing to one side and leads to the cable to vibrate, reduces detection efficiency's problem.
Three, the utility model provides a long and pile extension quality detection device of prestressed concrete hollow pile, the side ring sheathes in and is equipped with locking screw, will lead fixed lid and be fixed in the hollow pile top, and the fixed lid that leads of being convenient for guarantees the stability that the cable rises or descends in the measurement process.
Four, the utility model provides a long and pile extension quality detection device of prestressed concrete hollow pile, cable one end is connected in a sensor top, and the other end passes the cable through-hole and walks around the counter rim plate, is connected with the detecting instrument electricity, is convenient for like this with the ascending or descending data of cable in time, pass to the detecting instrument in step, guarantees the accuracy of data, has solved simultaneously that a sensor is located the underground or is in secret depths, the detecting instrument can't acquire the problem of signal.
Fifthly, the utility model provides a prestressed concrete hollow pile length and pile extension quality detection device, the sealed post lower part lateral wall is equipped with three measuring arm grooves, the measuring arm groove extends to the annular inversion platform and trisects the annular inversion platform, the upper end of the measuring arm is connected between the two opposite side walls of the measuring arm groove through the rotating shaft, when the three measuring arms are unfolded, the spreading range is consistent, and the stability of the sensor in the pile is ensured;
simultaneously, sealed post and the inside concentric hollow wire hole that is equipped with of round bar, be equipped with three spring inner chamber under the wire hole between lateral wall and the sealed post lateral wall, spring inner chamber is located survey arm groove directly over and both match the intercommunication, be equipped with pressure spring between survey arm top and the spring inner chamber roof, provide the holding power that outwards struts for the measuring arm like this, be equipped with three electro-magnet on the surface of round bar middle part, the electro-magnet is in same vertical plane with survey arm groove, match with the measuring arm is corresponding respectively, when the electro-magnet circular telegram, can adsorb three measuring arms on the round bar, when the electro-magnet outage, because pressure spring's extrusion struts three measuring arms, be convenient for measure the change of lateral wall angle.
Six, the utility model provides a long and pile extension quality detection device of prestressed concrete hollow pile surveys the arm bottom and is equipped with the gyro wheel, is equipped with speedtransmitter on the lateral wall of survey arm bottom and is located the gyro wheel side, and speedtransmitter of being convenient for like this in time passes to the detecting instrument with the rotational speed of gyro wheel.
Seventhly, the utility model provides a long and pile extension quality detection device of prestressed concrete hollow pile, electro-magnet central position are equipped with the spacing recess of test arm, and with the test arm phase-match, can further prescribe a limit to the test arm on the electro-magnet like this, prevent that the interior sensor of stake from touching the stake inner wall and producing the vibration at the decline in-process, and then lead to the test arm not reaching the pile bottom and just opening in advance.
Eight, the utility model provides a long and pile extension quality detection device of prestressed concrete hollow pile, the gyro wheel is along the vertical rotation of round bar length direction, and the gyro wheel of being convenient for can contact the stake end below the stake end and hold the layer of doing all can, simultaneously within the stake end, can both contact the hollow pile inner wall, rather than rolling friction.
Nine, the utility model provides a long and pile extension quality detection device of prestressed concrete hollow pile, inclination sensor, speedtransmitter, electro-magnet all are connected with cable socket through the wire, carry out the electricity and connect, avoid wireless transmission to receive the unable signal.
Ten, the utility model provides a long and pile extension quality detection device of prestressed concrete hollow pile passes to detecting instrument through survey arm inclination, the gyro wheel rotational speed that the sensor in the stake in time detected hollow pile bottom or inside, combines the counter to pass to pulling of cable in the detecting instrument and gets speed again, judges pile bottom position to calculate the stake length, and the analysis pile extension quality, overall structure is simple, easy operation, and measurement efficiency is higher and the precision is high.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention, and fig. 9 is a drill hole.
Fig. 2 is a schematic diagram of the structure of the sensor in the pile of the present invention.
Fig. 3 is a schematic view of the structural connection between the guiding fixing cover and the counter of the present invention.
Fig. 4 is a schematic view of the sealing post and the round bar structure of the present invention.
Fig. 5 is a bottom view of the sealing post and the round bar structure of the present invention.
Fig. 6 is a flowchart of the present invention.
Fig. 7 is a graph showing the variation of the rotation speed of the roller with the depth according to the present invention.
Fig. 8 is a graph showing the variation of the cable pull-up speed with the depth.
Fig. 9 is a graph showing the variation of the sliding coefficient with the depth according to the present invention.
Fig. 10 is a graph showing the variation of the inclination angle of the measuring arm with the depth according to the present invention.
Detailed Description
The present invention will be further clarified by the following detailed description, which is to be understood as being given by way of illustration only, and not by way of limitation, of the scope of the invention, which, after reading the present invention, is intended to fall within the scope of the appended claims, as modified by those skilled in the art in various equivalent forms.
Example 1: the prestressed concrete hollow pile length and pile extension quality detection device shown in fig. 1 to 4 comprises a detection instrument 1, a cable winch 2 and a hollow pile 3 which are positioned on the ground, wherein the detection instrument 1 is electrically connected with the cable winch 2 through a cable 10, the prestressed concrete hollow pile length and pile extension quality detection device also comprises a counter 4, a guide fixing cover 5 and a pile internal sensor 6, the counter 4 is electrically connected with the detection instrument 1 and is fixed on the guide fixing cover 5, the guide fixing cover 5 is arranged at the top of the hollow pile 3, and the pile internal sensor 6 is electrically connected with the detection instrument 1 through the cable 10;
the guide fixing cover 5 is divided into an upper cover 51 and a side ring sleeve 52, a cable through hole 53 is formed in the center of the upper cover 51, a locking screw 54 is arranged on the side ring sleeve 52, and the guide fixing cover 5 is fixed to the top of the hollow pile 3;
one end of the cable 10 is connected to the top of the sensor 6 in the pile, and the other end of the cable passes through the cable through hole 53, bypasses the wheel disc of the counter 4, is wound on the cable winch 2 and is finally electrically connected with the detection instrument 1; the vertical center line of the upper cover 51 is tangent with the outer edge of the wheel disc of the counter 4.
The in-pile sensor 6 comprises a sealing column 61, a round rod 62, a pressure spring 63, a measuring arm 64, an inclination angle sensor 65, a speed sensor 66, an electromagnet 67 and a roller 68, wherein the top of the sealing column 61 is provided with a cable socket 80 and is connected with a cable 10 joint, the bottom of the sealing column 61 is provided with the round rod 62, the radius of the round rod 62 is smaller than that of the sealing column 61, and the concentric connection ends of the two form an annular inverted platform 69;
the outer side wall of the lower part of the sealing column 61 is provided with three arm measuring grooves 611, and the arm measuring grooves 611 extend to penetrate through the annular inverted platform 69 and trisect the annular inverted platform 69; the sealing post 61 and the round rod 62 are internally provided with a concentric hollow wire guide hole 612, three spring inner cavities 613 are arranged between the lower side wall of the wire guide hole 612 and the outer side wall of the sealing post 61, the spring inner cavities 613 are positioned right above the arm measuring groove 611 and are communicated in a matching way, the upper end of the arm measuring 64 is rotatably connected between the two opposite side walls of the arm measuring groove 611 through a rotating shaft 614, and a pressure spring 63 is arranged between the top of the arm measuring 64 and the top wall of the spring inner cavity 613;
the side wall of the upper part of the measuring arm 64 is provided with an inclination angle sensor 65; the bottom end of the measuring arm 64 is provided with a roller 68, and the roller 68 vertically rotates along the length direction of the round rod 62; a speed sensor 66 is arranged on the side wall of the bottom end of the measuring arm 64 and is positioned beside a roller 68; three electromagnets 67 are arranged on the outer surface of the middle part of the round rod 62, and the electromagnets 67 and the arm measuring groove 611 are located on the same vertical plane and are correspondingly matched with the arm measuring 64 respectively.
The inclination angle sensor 65, the speed sensor 66 and the electromagnet 67 are all connected with the cable socket 80 through conducting wires, and when the electromagnet 67 is electrified, the three measuring arms 64 are adsorbed on the corresponding three electromagnets 67 at the same time; when the electromagnet 67 is powered off, the three measuring arms 64 are simultaneously unfolded outwards under the elastic force of the pressure spring 63; a measuring arm limiting groove 615 is formed in the center of the electromagnet 67 and matched with the measuring arm 64; the hollow pile 3 is divided into two sections, and a pile joint 30 is arranged in the middle.
The detection method of the prestressed concrete hollow pile length and pile extension quality detection device comprises the following steps:
step 1: drilling holes in the prestressed concrete hollow pile by using a drilling machine, removing soil mass gushing into the pipe and soil mass with a certain depth downwards from the end of the hollow pile in the pile sinking process, wherein the drilling depth exceeds the designed pile length of the prestressed concrete hollow pile by 1.5-2 m;
step 2: fixing a counter on the upper part of the guide fixing cover, and enabling the outer edge of a wheel disc of the counter to be tangent to the vertical central line of the upper cover, so as to ensure that the direction of pulling the cable is vertical upwards or downwards;
and step 3: one end of the cable, which is tied with the sensor in the pile, bypasses the counter wheel disc and is placed into the cable through hole, the sensor in the pile is placed downwards, when the cable is loosened, namely the sensor in the pile is placed to the bottom of the drilled hole, the cable is stopped to be placed downwards, and in the whole process, the electromagnet is electrified, and the measuring arm is adsorbed in the measuring arm limiting groove;
and 4, step 4: the electromagnet is powered off, the measuring arm is squeezed by the elastic force of the spring to be expanded all around, the cable winch is manually shaken to slowly pull and pull the cable upwards, the moving distance of the cable is transmitted into a detecting instrument in real time through a counter, the detecting instrument processes the moving distance of the cable and data transmitted back by a sensor in the pile, a depth-inclination angle graph and a depth-speed graph are drawn, when the pile end is met, the inclination angle is suddenly changed, the speed is reduced to zero, and therefore the construction pile length of the prestressed concrete hollow pile can be obtained;
and 5: when the sensor in the pile enters the hollow pile, the cable is continuously and slowly pulled upwards, and when the roller meets a good pile joint, the inclination angle and the speed of the roller are hardly changed; when the pile joint part is loosened, locally dislocated and the pile head is broken, the inclination angle and the cable pulling-up speed are suddenly changed, so that the pile splicing quality of the prestressed concrete hollow pile can be obtained.
The specific working mode of the utility model is as follows:
① drilling holes in the prestressed concrete hollow pile 3 by a drilling machine, removing soil with a certain depth in the holes and downward from the pile end, wherein the depth of the drilled hole 9 exceeds the designed pile length of the prestressed concrete hollow pile 3 by 1.5m, so as to prevent silt from depositing too fast to block the channel in the holes;
② fixing the guide fixing cover 5 on the upper port of the hollow pile 3 through the locking screw 54, and fixing the counter 4 on the guide fixing cover 5;
③ confirming that the three arms 64 of the in-pile sensor 6 are attracted to the round bar 62 by the electromagnet 67;
④ manually controlling the cable 10 of the cable winch 2 to bypass the counter 4, passing the in-pile sensor 6 at the end of the cable 10 through the cable through hole 53 and slowly putting the in-pile sensor into the hollow pile 3, and determining the depth position of the in-hole sensor according to the depth mark on the cable 10;
⑤ confirming whether the in-pile sensor 6 reaches the bottom of the borehole 9 by determining the tightness of the cable 10, if the in-pile sensor has reached the bottom of the borehole 9, the cable 10 will slacken and the depth value read;
⑥ operating the detecting instrument 1 to close the electromagnet 67 switch to open the three measuring arms 64 outward, at this time, reading the inclination angle data of the three measuring arms from the inclination angle sensor 65 on the detecting instrument to judge whether the three measuring arms are opened outward;
⑦ manually and manually shaking the cable winch 2 to slowly and uniformly lift the sensor in the pile, and displaying and storing the inclination angle of the three measuring arms 64 to the vertical direction and the speed of the roller 68 at the end of the measuring arm on the detecting instrument 1 at the preset measuring interval;
⑧, calculating and drawing a curve of inclination angle changing with depth, a curve of roller rotation speed changing with depth, and a curve of sliding coefficient changing with depth according to the detected information of inclination angle, roller rotation speed, cable movement speed and depth;
⑨, after detection is completed, for an interval with a large change of the internal inclination angle of the pile and the cable pulling speed, reducing the measurement interval, putting the sensor in the pile about 1m below the position again, and repeating the steps 6, 7 and 8 to further improve the detection precision;
the utility model discloses a sealed post 61 is the concentric post of cavity with round bar 62 for the wire of connecting cable socket 80 all passes through from sealed post 61 and round bar 62 are inside, and links to each other with inclination sensor 65, speedtransmitter 66, electro-magnet 67 electricity.
Wherein, the detecting instrument 1 is a universal secondary instrument;
the cable winch 2 is a common hand-operated roller cable winch, namely, a cable is wound on a rotary roller and is controlled to be wound and unwound by manual anticlockwise or clockwise rotation;
the counter 4 adopts a Z94-F rolling counter, wherein a runner is replaced by a runner with a groove, so that a cable can be conveniently wound around the runner and cannot be separated from the runner;
the electromagnet 67 is of the type ELE-P25/10;
the cable socket 80 is a general component, and is connected with the conducting wire in the sealing column 61;
the tilt angle sensor 65 is an ultrahigh precision digital output type double-shaft tilt angle sensor with the model of CT926T, and is manufactured by Wuxi Yong for sensing technology Limited;
the speed sensor 66 is a hall gear speed sensor manufactured by Guangdong de bao ro smart technologies, Inc.
(II), the utility model discloses construction pile length and pile extension quality testing:
① construction pile length detection
The utility model mainly judges the position of the pile bottom by comprehensively analyzing the change of the inclination angle of the measuring arm 64 and the change rate of the speed of the roller 68, thereby determining the pile length; when the roller 68 moves in the hole 9 at the lower part of the hollow pile 3, the rotating speed of the roller 68 is very small and tends to zero (see a curve of the inclination angle of the measuring arm along with the depth of the hollow pile 10) (earth, sand, soil silt and clay on the outer wall of the hole below the pile end, compared with the wall of the concrete hole in the hard pile, the surface strength of the soil is lower, the friction force is smaller, the roller 68 slides under the action of the supporting force of the pressure spring 63 and the pull force of the cable, and the rotating speed is very small and almost zero (see a curve of the rotating speed of the roller along with the depth of the roller 7); as roller 68 moves within hollow pile 3, roller 68 rolls, the linear speed of roller 68 being equal to the cable 10 pull speed. Therefore, a cable drawing speed curve (figure 8), a roller speed curve (figure 7) and a sliding coefficient curve (figure 9) { (cable upward movement speed-roller rotation speed roller radius)/cable drawing speed) } are drawn, when the hollow pile 3 is inside, the surface strength of the inner wall of the pile is high, the friction force is large, the roller rolls along the inner wall of the pile at the moment, the roller rotation speed is greater than zero (the roller linear speed is less than or equal to the cable drawing speed), the sliding coefficient is very small and is almost zero, the rotation speed at the lower part of the hollow pile 3 is almost zero, and the sliding coefficient is approximately equal to 1 (see a curve of the sliding coefficient along with the depth of figure 9), so that the pile end position is judged. The inner diameter of the prestressed concrete hollow pile is a fixed value, namely, the opening inclination angle (the angle between the measuring arm and the vertical direction) of the measuring wall 64 is fixed (the included angle between the two adjacent measuring arms 64 is 110 degrees), when a drill bit drills out of the pile from the inside of the hollow pile 3, the drill rod can swing greatly due to the fact that the drill bit does not have the constraint of the inner wall of the pile, the diameter of the hole is enlarged, namely, the opening inclination angle of the measuring arm 64 is large (see a curve that the inclination angle of the measuring arm changes along with the depth in fig. 10), and the starting point of the fixed inclination angle is. The pile length can be calculated by combining the known pile top.
② pile splicing quality detection
The quality of the prestressed concrete pile is comprehensively judged by comprehensively analyzing the cable pulling speed and the inclination angle of the measuring arm 64. The inner wall of the tubular pile is flat and smooth, the cross section is regular and fixed in size (the diameter of the tubular pile is fixed), and when the pile joints 30 are well connected and the sensor 6 in the pile passes through the upper pile joint and the lower pile joint, the inclination angle of the measuring arm 64 and the pulling speed of the cable 10 are hardly changed. When the pile joint 30 is loosened, partially dislocated and the pile head is broken, the cross section shape between the upper pile end plate and the lower pile end plate is changed and the kinetic energy of the roller is lost, under the action of the tension of the cable 10 and the pressure spring 63, the inclination angle of the measuring arm 64 and the pulling speed of the cable 10 are changed (see a curve of the inclination angle of the measuring arm along with the depth and a curve of the pulling speed of the cable along with the depth in fig. 10), and in conclusion, the pile connecting quality of the prestressed concrete hollow pile 3 can be judged according to the inclination angle of the measuring arm and the change of the pulling speed of the.
Claims (7)
1. Long and pile extension quality detection device of prestressed concrete hollow pile, including being located subaerial detecting instrument (1), cable winch (2), hollow pile (3), its characterized in that is connected through cable (10) electricity in detecting instrument (1) and cable winch (2): the device is characterized by further comprising a counter (4), a guide fixing cover (5) and a pile internal sensor (6), wherein the counter (4) is electrically connected to the detecting instrument (1) and fixed on the guide fixing cover (5), the guide fixing cover (5) is arranged at the top of the hollow pile (3), and the pile internal sensor (6) is electrically connected with the detecting instrument (1) through a cable (10).
2. The device for detecting the pile length and pile extension quality of the prestressed concrete hollow pile according to claim 1, characterized in that: the guide fixing cover (5) is divided into an upper cover (51) and a side ring sleeve (52), a cable through hole (53) is formed in the center of the upper cover (51), a locking screw (54) is arranged on the side ring sleeve (52), and the guide fixing cover (5) is fixed to the top of the hollow pile (3);
one end of the cable (10) is connected to the top of the sensor (6) in the pile, and the other end of the cable penetrates through the cable through hole (53), bypasses the wheel disc of the counter (4), is wound on the cable winch (2), and is finally electrically connected with the detection instrument (1).
3. The prestressed concrete hollow pile length and pile extension quality detection device according to claim 2, characterized in that: the vertical central line of the upper cover (51) is tangent with the outer edge of the wheel disc of the counter (4).
4. The prestressed concrete hollow pile length and pile extension quality detection device according to claim 1, characterized in that: the in-pile sensor (6) consists of a sealing column (61), a round rod (62), a pressure spring (63), a measuring arm (64), an inclination angle sensor (65), a speed sensor (66), an electromagnet (67) and a roller (68), wherein a cable socket (80) is arranged at the top of the sealing column (61) and is connected with a cable (10) joint, the round rod (62) is arranged at the bottom of the sealing column (61), the radius of the round rod (62) is smaller than that of the sealing column (61), and the concentric connecting ends of the sealing column and the round rod form an annular inverted platform (69);
the outer side wall of the lower part of the sealing column (61) is provided with three arm measuring grooves (611), and the arm measuring grooves (611) extend through the annular inverted platform (69) and trisect the annular inverted platform (69);
the sealing post (61) and the round rod (62) are internally provided with concentric hollow wire holes (612), three spring inner cavities (613) are arranged between the lower side wall of the wire hole (612) and the outer side wall of the sealing post (61), the spring inner cavities (613) are positioned right above the arm measuring groove (611) and are communicated in a matching way, the upper end of the arm measuring (64) is rotatably connected between the two opposite side walls of the arm measuring groove (611) through a rotating shaft (614), and a pressure spring (63) is arranged between the top of the arm measuring (64) and the top wall of the spring inner cavity (613);
the side wall of the upper part of the measuring arm (64) is provided with an inclination angle sensor (65);
the bottom end of the measuring arm (64) is provided with a roller (68), and the roller (68) vertically rotates along the length direction of the round rod (62);
a speed sensor (66) is arranged on the side wall of the bottom end of the measuring arm (64) and is positioned beside the roller (68);
three electromagnets (67) are arranged on the outer surface of the middle part of the round rod (62), and the electromagnets (67) and the arm measuring groove (611) are located on the same vertical plane and are respectively matched with the arm measuring groove (64) correspondingly.
5. The prestressed concrete hollow pile length and pile extension quality detection device according to claim 4, wherein: the inclination angle sensor (65), the speed sensor (66) and the electromagnets (67) are all connected with the cable socket (80) through conducting wires, and when the electromagnets (67) are electrified, the three measuring arms (64) are adsorbed on the corresponding three electromagnets (67) at the same time; when the electromagnet (67) is powered off, the three measuring arms (64) are simultaneously expanded outwards under the elastic force of the pressure spring (63).
6. The prestressed concrete hollow pile length and pile extension quality detection device according to claim 5, characterized in that: the central position of the electromagnet (67) is provided with a measuring arm limiting groove (615) which is matched with the measuring arm (64).
7. The prestressed concrete hollow pile length and pile extension quality detection device according to claim 1, characterized in that: the hollow pile (3) is divided into two sections, and a pile joint (30) is arranged in the middle.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109868852A (en) * | 2019-04-03 | 2019-06-11 | 淮安市建筑工程质量检测中心有限公司 | Prestressing concrete hollow pile length and pile extension quality detection device and its method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109868852A (en) * | 2019-04-03 | 2019-06-11 | 淮安市建筑工程质量检测中心有限公司 | Prestressing concrete hollow pile length and pile extension quality detection device and its method |
| CN109868852B (en) * | 2019-04-03 | 2023-11-28 | 淮安市建筑工程质量检测中心有限公司 | Pile length and pile splicing quality detection device and method for prestressed concrete hollow pile |
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Denomination of utility model: Testing device for length and quality of prestressed concrete hollow pile connection Effective date of registration: 20230926 Granted publication date: 20200207 Pledgee: Huaian Qingjiang puyintai financing Company limited by guarantee Pledgor: HUAIAN CONSTRUCTION ENGINEERING QUALITY INSPECTION CENTER Co.,Ltd. Registration number: Y2023980058568 |