Engineering foundation pile detection device

Abstract

The invention relates to the technical field of sampling detection, in particular to an engineering foundation pile detection device which comprises a core drilling sampling pipe and a cavity tooth column used for driving the core drilling sampling pipe to rotate, a split power shaft is arranged in the cavity tooth column in a penetrating mode, and the split power shaft and the cavity tooth column can rotate relatively; a driving shifting plate is fixedly arranged on the outer surface of the split power shaft, and side vertical plates are symmetrically arranged on the two sides of the driving shifting plate; the cutting pressure applied in the coring process of the core drilling sampling pipe can be detected, so that the external control equipment is matched to control the feeding speed, the cutting pressure is kept unchanged within the error range, and the cutting pressure can be determined by recording the change condition of the feeding speed of the external control equipment. And the strength change condition of the engineering foundation pile at different depths can be reflected.

Description

Technical Field

[0001] The invention relates to the technical field of sampling detection, in particular to an engineering foundation pile detection device. Background Art

[0002] Engineering foundation piles are a columnar structure that goes deep into the ground. They are mainly used to transfer the load of buildings or structures to deep stable soil or rock layers to ensure the stability and safety of engineering structures. For the detection of engineering foundation piles, the existing technology often uses the core drilling method, that is, drilling cylindrical core samples of engineering foundation piles for detection. According to the specifications, if the pile diameter is ≤1.2m, one hole can be drilled. The center or symmetrical position of the pile is preferred to avoid the main reinforcement. After the core is taken, it is sent to the laboratory for analysis of compressive strength, microstructure, etc. Finally, the holes left on the engineering foundation piles are repaired by grouting. The detection device in the existing technology can only perform core sampling on the engineering foundation piles, and cannot make a preliminary estimate of the strength changes of the engineering foundation piles at different depths. Summary of the invention

[0003] The purpose of the present invention is to provide an engineering foundation pile detection device to solve the problems raised in the above background technology.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an engineering foundation pile detection device, comprising a core sampling tube and a cavity tooth column for driving the core sampling tube to rotate, wherein a split power shaft is provided through the cavity tooth column, and the split power shaft and the cavity tooth column can rotate relative to each other;

[0005] A driving plate is fixedly provided on the outer surface of the split power shaft, and side plates are symmetrically provided on both sides of the driving plate. The side plates are fixedly installed on the inner wall surface of the cavity tooth column, and a first pressure sensor is provided between the driving plate and the side plates; when the split power shaft drives the cavity tooth column to rotate, the first pressure sensor can detect the change of the resistance of the cavity tooth column;

[0006] A pressure monitoring module is arranged outside the core sampling tube, and the pressure monitoring module can monitor the coring pressure of the core sampling tube, and cooperate with external control equipment to control the axial pressure of the core sampling tube within an error range during the coring process.

[0007] It also includes a structural outer frame, a track slide arm and a sliding module, wherein the track slide arm is fixedly mounted on the structural outer frame, and the sliding module is slidably limited and mounted on the outside of the track slide arm, so that the sliding module can slide on the outside of the track slide arm along the axial direction of the core sampling tube;

[0008] The pressure monitoring module comprises a lower pressure plate fixedly arranged on the sliding module.

[0009] The pressure monitoring module also includes an induction pressure plate arranged inside the structural outer frame, a second pressure sensor is arranged between the induction pressure plate and the structural outer frame, the second pressure sensor can detect the pressure exerted on the induction pressure plate, and a pressure spring is arranged between the induction pressure plate and the lower pressure plate;

[0010] A driven gear is fixedly arranged on the outside of the core sampling tube, and the driven gear is limitedly arranged in the sliding module. The driven gear is meshed with the cavity tooth column, and the driven gear can move relatively along the axial direction of the cavity tooth column.

[0011] A propulsion module is fixedly arranged on the lower pressure plate, and a side wall tooth groove is provided on the inner wall surface of the structural outer frame;

[0012] The propulsion module is provided with an explosion chamber and a driving chamber which are interconnected. A piston column is arranged in the driving chamber. A reset spring is arranged on the upper part of the piston column. The reset spring applies elastic tension to the piston column so that the piston column has an elastic tendency to move upward.

[0013] An igniter is arranged inside the explosion chamber, and a mixed gas supply valve and an exhaust switch valve are embedded and installed on the inner wall surface of the explosion chamber. The mixed gas supply valve can input a mixed gas of fuel gas and oxygen into the explosion chamber, and the exhaust switch valve is used to control the connection state between the explosion chamber and the external environment; when the igniter is energized, the mixed gas input by the mixed gas supply valve can be detonated.

[0014] The piston column is provided with a pre-driving chamber and a pressure groove, the interior of the pre-driving chamber is provided with a pre-driving plug plate, and the pre-driving plug plate is in sealing contact with the pre-driving chamber;

[0015] One end of the pressure groove is communicated with the pre-driving chamber, and the other end is communicated with the upper surface of the piston column.

[0016] A plug plate spring sheet is arranged on the side of the pre-motion plug plate away from the pressure groove, and the plug plate spring sheet applies an elastic thrust to the pre-motion plug plate to move in the direction of the pressure groove, and a breathing air window is opened through the inner wall surface of the pre-drive chamber; a retractable tongue plate is fixedly arranged on the pre-motion plug plate, and when the retractable tongue plate is extended, it can be inserted into the side wall tooth groove for limiting.

[0017] A lower buckle is fixedly provided on the telescopic tongue plate, and an upper buckle is fixedly provided on the propulsion module, and the lower buckle and the upper buckle can be buckled with each other;

[0018] When explosion pressure is generated in the explosion chamber, the piston column is limited by the mutual engagement of the lower buckle and the upper buckle; the pre-movement plug plate first drives the telescopic tongue plate and the lower buckle to move under the explosion pressure, so that the telescopic tongue plate is inserted into the side wall tooth groove, at this time the lower buckle is separated from the upper buckle to release the limit, and then the piston column moves downward again.

[0019] A limiting ring rim and a limiting semi-arc platform are fixedly arranged on the inner wall surface of the driving cavity, and the limiting ring rim and the limiting semi-arc platform limit the upper and lower positions of the piston column respectively.

[0020] An annular boss is coaxially fixedly disposed at the bottom of the cavity tooth column, a conducting ring is disposed on the annular boss, and the conducting ring is connected to the first pressure sensor circuit;

[0021] A telescopic box is fixedly arranged on the inner wall of the structural outer frame, and an elastic and telescopic connecting contact shaft is arranged on the telescopic box. The connecting contact shaft is in sliding contact with the conducting ring, so that the first pressure sensor is connected to the external circuit through the conducting ring and the connecting contact shaft.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] The engineering foundation pile detection device of the present invention can detect the cutting pressure applied during the coring process of the core sampling tube, thereby cooperating with the external control device to control the feed speed so that the cutting pressure remains unchanged within the error range. At this time, by recording the changes in the feed speed of the external control device, the strength changes of the engineering foundation piles at different depths can be reflected, thereby achieving preliminary estimation detection.

[0024] The engineering foundation pile detection device of the present invention can sample the core drilling of the engineering foundation piles, and during the sampling process, when the core drilling sampling tube is stuck, the driving plate, the side plate and the first pressure sensor are used to detect the stuck situation through pressure changes, and the core drilling sampling tube can be driven to move up a certain distance through the provided sliding module, the propulsion module and the side wall tooth groove and other structures, and then reset to continue drilling the core, so that the device can automatically get out of trouble when stuck. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0026] Figure 2 It is the front view of the overall structure of the present invention.

[0027] Figure 3 It is a three-dimensional half-section schematic diagram of the present invention.

[0028] Figure 4 for Figure 3 A magnified schematic diagram of area A in the middle.

[0029] Figure 5 for Figure 3 Enlarged schematic diagram of area B in the middle.

[0030] Figure 6 It is a three-dimensional half-section front view of the present invention.

[0031] Figure 7 for Figure 6 Enlarged schematic diagram of area C in the middle.

[0032] Figure 8 It is a half-section schematic diagram of the present invention at a horizontal angle.

[0033] Fig. 9 It is a schematic diagram of the structure of parts of the present invention.

[0034] In the figure: 1, core sampling tube; 2, cavity tooth column; 3, split power shaft; 4, driving plate; 5, side plate; 6, first pressure sensor; 7, structural frame; 8, track slide arm; 9, sliding module; 901, lower pressure plate; 902, induction pressure plate; 903, second pressure sensor; 904, pressure spring; 905, driven gear; 701, propulsion module; 702, side wall tooth groove; 703, explosion chamber; 704, driving chamber; 705, piston column; 706, reset spring; 707, igniter; 708, mixed gas valve; 709, exhaust switch valve; 710, pre-drive chamber; 711, pre-actuated plug plate; 712, pressure groove; 713, plug plate spring; 714, breathing air window; 715, telescopic tongue plate; 716, lower buckle; 717, upper buckle; 718, limiting ring eaves; 719, limiting semi-arc platform; 201, annular boss; 202, conduction ring; 203, telescopic box; 204, connecting contact shaft. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] See also Figures 1 to 9 The present invention provides a technical solution: an engineering pile detection device, such as Figure 1 As shown in , it includes a core sampling tube 1 and a cavity tooth column 2 for driving the core sampling tube 1 to rotate. The bottom of the core sampling tube 1 is provided with an annular cutting edge, and the thickness of the cutting edge is greater than the wall thickness of the core sampling tube 1, so as to reduce the friction during the core drilling process. A split power shaft 3 is provided through the cavity tooth column 2, and the split power shaft 3 and the cavity tooth column 2 can rotate relative to each other; as shown in Figure 8 As shown in the figure, a driving plate 4 is fixedly arranged on the outer surface of the split power shaft 3, and side plates 5 are symmetrically arranged on both sides of the driving plate 4. The side plates 5 are fixedly installed on the inner wall surface of the cavity tooth column 2, and a first pressure sensor 6 is arranged between the driving plate 4 and the side plates 5; when the split power shaft 3 drives the cavity tooth column 2 to rotate, the first pressure sensor 6 can detect the change of the resistance suffered by the cavity tooth column 2;

[0037] A pressure monitoring module is arranged on the outside of the core sampling tube 1, and the pressure monitoring module can monitor the coring pressure of the core sampling tube 1, and cooperate with the external control equipment to control the axial pressure of the core sampling tube 1 within the error range during the coring process. The external control equipment can control the feed speed of the core sampling tube 1 along the axial direction of the core sampling tube 1 and record it.

[0038] It also includes a structural outer frame 7, a track slide arm 8 and a sliding module 9. The track slide arm 8 is fixedly mounted on the structural outer frame 7, and the sliding module 9 is slidably limited and mounted on the outside of the track slide arm 8, so that the sliding module 9 can slide on the outside of the track slide arm 8 along the axial direction of the core sampling tube 1;

[0039] The pressure monitoring module includes a lower pressure plate 901 fixedly arranged on the sliding module 9, and the pressure monitoring module also includes a sensing pressure plate 902 arranged inside the structural outer frame 7, a second pressure sensor 903 is arranged between the sensing pressure plate 902 and the structural outer frame 7, and the second pressure sensor 903 can detect the pressure exerted on the sensing pressure plate 902, and a pressure spring 904 is arranged between the sensing pressure plate 902 and the lower pressure plate 901;

[0040] A driven gear 905 is fixedly disposed outside the core sampling tube 1 . The driven gear 905 is limitedly disposed in the sliding module 9 . The driven gear 905 meshes with the cavity tooth column 2 , and the driven gear 905 can move relatively along the axial direction of the cavity tooth column 2 .

[0041] The lower pressing plate 901 is fixedly provided with a propulsion module 701. Figure 4 As shown in the figure, a side wall tooth groove 702 is provided on the inner wall surface of the structural outer frame 7; an explosion chamber 703 and a driving chamber 704 which are interconnected are provided in the propulsion module 701, a piston column 705 is provided in the driving chamber 704, a reset spring 706 is provided on the upper part of the piston column 705, and the reset spring 706 applies an elastic tension to the piston column 705, so that the piston column 705 has an elastic tendency to move upward.

[0042] An igniter 707 is arranged inside the explosion chamber 703, and a mixed gas supply valve 708 and an exhaust switch valve 709 are embedded and installed on the inner wall surface of the explosion chamber 703. The mixed gas supply valve 708 can input a mixed gas of fuel gas and oxygen into the explosion chamber 703, and the exhaust switch valve 709 is used to control the connection state between the explosion chamber 703 and the external environment; when the igniter 707 is energized, the mixed gas input by the mixed gas supply valve 708 can be detonated.

[0043] A pre-drive chamber 710 and a pressure groove 712 are provided in the piston column 705. A pre-drive plug plate 711 is provided inside the pre-drive chamber 710. The pre-drive plug plate 711 is in sealed contact with the pre-drive chamber 710. One end of the pressure groove 712 is connected to the pre-drive chamber 710, and the other end is connected to the upper surface of the piston column 705.

[0044] A plug plate spring piece 713 is provided on one side of the pre-movement plug plate 711 away from the pressure groove 712. The plug plate spring piece 713 applies an elastic thrust to the pre-movement plug plate 711 to move in the direction of the pressure groove 712. A breathing air window 714 is provided on the inner wall surface of the pre-drive chamber 710. The breathing air window 714 can balance the air pressure when the pre-movement plug plate 711 moves quickly. A retractable tongue plate 715 is fixedly provided on the pre-movement plug plate 711. When the retractable tongue plate 715 is extended, it can be inserted into the side wall tooth groove 702 for limiting. Figure 4 As shown in , the surfaces of the telescopic tongue plate 715 and the side wall tooth groove 702 are both provided with guiding inclined surfaces, so that the telescopic tongue plate 715 can be stably inserted into the side wall tooth groove 702 when extended through guidance.

[0045] A lower buckle 716 is fixedly provided on the telescopic tongue plate 715, and an upper buckle 717 is fixedly provided on the propulsion module 701, and the lower buckle 716 and the upper buckle 717 can be buckled with each other;

[0046] When explosion pressure is generated in the explosion chamber 703, the piston column 705 is limited by the mutual engagement of the lower buckle 716 and the upper buckle 717; the pre-movement plug plate 711 first drives the telescopic tongue plate 715 and the lower buckle 716 to move under the explosion pressure, so that the telescopic tongue plate 715 is inserted into the side wall tooth groove 702, at this time, the lower buckle 716 and the upper buckle 717 are separated to release the limit, and then the piston column 705 moves downward again.

[0047] A limiting annular rim 718 and a limiting semi-arc platform 719 are fixedly provided on the inner wall surface of the driving chamber 704 , and the limiting annular rim 718 and the limiting semi-arc platform 719 limit the upper and lower positions of the piston column 705 respectively.

[0048] like Figure 5As shown in the figure, an annular boss 201 is coaxially fixedly arranged at the bottom of the cavity tooth column 2, and a conducting ring 202 is arranged on the annular boss 201, and the conducting ring 202 is connected to the circuit of the first pressure sensor 6; a telescopic box 203 is fixedly arranged on the inner wall of the structural outer frame 7, and an elastically telescopic connecting contact shaft 204 is arranged on the telescopic box 203, and the connecting contact shaft 204 is in sliding contact with the conducting ring 202, so that the first pressure sensor 6 is connected to the external circuit through the conducting ring 202 and the connecting contact shaft 204.

[0049] When the engineering foundation pile detection device of the present invention is in use, it is installed with the external control device through the structural outer frame 7, and the feeding speed of the core sampling tube 1 along the axial direction of the core sampling tube 1 is controlled and recorded by the external control device; in one embodiment, the above-mentioned external control device can be a screw structure driven by a servo motor, and the slider assembly in the screw structure is fixedly installed with the structural outer frame 7, and the rotation of the screw is controlled by the servo motor, so that the slider assembly drives the structural outer frame 7 to feed and move along the axial direction of the core sampling tube 1; in another embodiment, the external control device can be a hydraulic cylinder that can accurately control the telescopic length; the external control device is a common device in the prior art and will not be described in detail in this application.

[0050] For example, when sampling is performed downward perpendicularly to the plane of the engineering piles while avoiding the main reinforcement of the engineering piles according to the specification, the split power shaft 3 is connected to the motor to drive the split power shaft 3 to rotate at a constant speed. When the split power shaft 3 rotates, Figure 8 As shown in , the split power shaft 3 drives the side plate 5 through the driving plate 4. At this time, the first pressure sensor 6 can detect the contact pressure between the driving plate 4 and the side plate 5. At the same time, the cavity tooth column 2 rotates, and the cavity tooth column 2 drives the driven gear 905 to rotate through meshing, so that the core sampling tube 1 rotates. The external control device controls the core sampling tube 1 to feed along the axis direction of the core sampling tube 1. When the core sampling tube 1 contacts the engineering foundation pile, the extrusion force acts on the core sampling tube 1, as shown in FIG. Figure 1 As shown in , the sliding module 9 moves upward, and the lower pressure plate 901 moves upward at this time, compressing the pressure spring 904. The second pressure sensor 903 detects the pressure through the induction pressure plate 902, so that the pressure change during the sampling process of the core sampling tube 1 can be detected in real time. When the pressure is less than the set threshold, the external control device increases the feed speed of the core sampling tube 1. When the pressure is higher than the set threshold, the external control device slows down the feed speed of the core sampling tube 1, so that the cutting pressure of the core sampling tube 1 is stabilized within the error range. At this time, the external control device controls the feed speed change of the core sampling tube 1, which can reflect the strength change of the engineering foundation pile at different depths. The interval with fast feed speed indicates that the concrete strength of the engineering foundation pile is weak, and the interval with slow feed speed indicates that the concrete strength of the engineering foundation pile is high, so as to achieve a preliminary estimate.

[0051] like Figure 8 As shown in , in the process of the split power shaft 3 driving the cavity tooth column 2 to rotate, the first pressure sensor 6 detects the change of the resistance of the cavity tooth column 2 in real time. When the core sampling tube 1 is stuck, the detection pressure value of the first pressure sensor 6 will increase. When the pressure value detected by the first pressure sensor 6 exceeds a certain set value, it means that the core sampling tube 1 is stuck during the coring and cutting process. At this time, the igniter 707 is energized to detonate the mixture of combustible gas and oxygen in the explosion chamber 703, so that the explosion pressure inside the explosion chamber 703 is greatly increased; as shown in Figure 4 As shown in , at this time, due to the mutual engagement and locking of the lower clip 716 and the upper clip 717, the piston column 705 is in a locked state and cannot move downward, and the high pressure acts on the pre-movement plug plate 711 through the pressure groove 712, pushing the pre-movement plug plate 711 to drive the telescopic tongue plate 715 to move right, so that the telescopic tongue plate 715 is inserted into the side wall tooth groove 702, and at the same time the lower clip 716 and the upper clip 717 are separated and unlocked. At this time, the piston column 705 can move downward, and the high pressure in the explosion chamber 703 pushes the piston column 705 downward again. Since the telescopic tongue plate 715 is stuck in the side wall tooth groove 702, the propulsion module 701 and the lower pressure plate 901 will move upward relative to the side wall tooth groove 702, and the sliding module 9 moves upward relative to the structural outer frame 7, and the core sampling tube 1 is driven to move upward and lifted for a distance, free from the jam and then move downward and reset again for coring and cutting, so that the device can automatically get out of trouble when it is stuck.

[0052] During the above-mentioned automatic escape process, the sliding module 9 is driven to move upward. At this time, the pressure spring 904 will be compressed, causing the detection data of the second pressure sensor 903 to change. The detection data of the second pressure sensor 903 during the automatic escape process is ignored through preset programming, thereby avoiding interference caused by the automatic escape process.

[0053] During resetting, the mixed gas supply valve 708 inputs a mixed gas of fuel gas and oxygen into the explosion chamber 703 at a positive pressure, and the exhaust switch valve 709 opens to discharge the pressure and exhaust gas to the outside, completing the renewal and resetting of the gas inside the explosion chamber 703, and the internal pressure of the explosion chamber 703 disappears, and the piston column 705 moves up and resets. In the process of the piston column 705 moving up relative to the propulsion module 701, under the elastic force of the plug plate spring piece 713, the retractable tongue plate 715 moves out of the side wall tooth groove 702 and resets, and the reset spring 706 continues to pull the piston column 705 upward. When the lower buckle 716 contacts the upper buckle 717, the guide inclined surfaces on the lower buckle 716 and the upper buckle 717 enable the two to elastically avoid each other and then be buckled and locked again.

[0054] The first pressure sensor and the second pressure sensor involved in the present application are both intelligent sensors under the existing technology.

[0055] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An engineering foundation pile detection device, comprising a core sampling tube (1) and a cavity tooth column (2) for driving the core sampling tube (1) to rotate, characterized in that: A split power shaft (3) is provided through the hollow tooth column (2), and the split power shaft (3) and the hollow tooth column (2) are capable of relative rotation; A driving plate (4) is fixedly arranged on the outer surface of the split power shaft (3), side plates (5) are symmetrically arranged on both sides of the driving plate (4), the side plates (5) are fixedly installed on the inner wall surface of the cavity tooth column (2), and a first pressure sensor (6) is arranged between the driving plate (4) and the side plates (5); when the split power shaft (3) drives the cavity tooth column (2) to rotate, the first pressure sensor (6) can detect the change in resistance experienced by the cavity tooth column (2); A pressure monitoring module is arranged outside the core sampling tube (1), and the pressure monitoring module can monitor the coring pressure of the core sampling tube (1), and cooperate with external control equipment to control the axial pressure of the core sampling tube (1) within an error range during the coring process.

2. The engineering foundation pile detection device according to claim 1, characterized in that: It also comprises a structural outer frame (7), a track slide arm (8) and a sliding module (9), wherein the track slide arm (8) is fixedly mounted on the structural outer frame (7), and the sliding module (9) is slidably limited and mounted outside the track slide arm (8), so that the sliding module (9) can slide outside the track slide arm (8) along the axial direction of the core sampling tube (1); The pressure monitoring module comprises a lower pressure plate (901) fixedly arranged on the sliding module (9).

3. The engineering foundation pile detection device according to claim 2, characterized in that: The pressure monitoring module also includes a sensing pressure plate (902) arranged inside the structural outer frame (7), a second pressure sensor (903) is arranged between the sensing pressure plate (902) and the structural outer frame (7), and the second pressure sensor (903) can detect the pressure exerted on the sensing pressure plate (902), and a pressure spring (904) is arranged between the sensing pressure plate (902) and the lower pressure plate (901); A driven gear (905) is fixedly arranged on the outside of the core sampling tube (1); the driven gear (905) is limitedly arranged in the sliding module (9); the driven gear (905) and the cavity tooth column (2) are meshed with each other, and the driven gear (905) can move relatively along the axial direction of the cavity tooth column (2).

4. The engineering foundation pile detection device according to claim 2, characterized in that: A propulsion module (701) is fixedly arranged on the lower pressing plate (901), and a side wall tooth groove (702) is provided on the inner wall surface of the structural outer frame (7); The propulsion module (701) is provided with an explosion chamber (703) and a driving chamber (704) which are interconnected. A piston column (705) is provided in the driving chamber (704). A reset spring (706) is provided on the upper part of the piston column (705). The reset spring (706) applies an elastic tension to the piston column (705), so that the piston column (705) has an elastic tendency to move upward.

5. The engineering foundation pile detection device according to claim 4, characterized in that: An igniter (707) is arranged inside the explosion chamber (703), and a mixed gas supply valve (708) and an exhaust switch valve (709) are embedded and installed on the inner wall surface of the explosion chamber (703). The mixed gas supply valve (708) can input a mixed gas of fuel gas and oxygen into the explosion chamber (703), and the exhaust switch valve (709) is used to control the connection state between the explosion chamber (703) and the external environment; when the igniter (707) is powered on, the mixed gas input by the mixed gas supply valve (708) can be detonated.

6. The engineering foundation pile detection device according to claim 4, characterized in that: The piston column (705) is provided with a pre-driving chamber (710) and a pressure groove (712); a pre-driving plug plate (711) is provided inside the pre-driving chamber (710); and the pre-driving plug plate (711) is in sealing contact with the pre-driving chamber (710); One end of the pressure channel (712) is in communication with the pre-driving chamber (710), and the other end is in communication with the upper surface of the piston column (705).

7. The engineering foundation pile detection device according to claim 6, characterized in that: A plug plate spring piece (713) is arranged on the side of the pre-motion plug plate (711) away from the pressure groove (712), and the plug plate spring piece (713) applies an elastic thrust to the pre-motion plug plate (711) to move in the direction of the pressure groove (712). A breathing air window (714) is opened through the inner wall surface of the pre-drive chamber (710) to the outside; a retractable tongue plate (715) is fixedly arranged on the pre-motion plug plate (711), and when the retractable tongue plate (715) is extended, it can be inserted into the side wall tooth groove (702) for limiting.

8. The engineering foundation pile detection device according to claim 7, characterized in that: A lower buckle (716) is fixedly provided on the telescopic tongue plate (715), and an upper buckle (717) is fixedly provided on the propulsion module (701), and the lower buckle (716) and the upper buckle (717) can be buckled with each other; When explosion pressure is generated in the explosion chamber (703), the piston column (705) is limited by the mutual engagement of the lower buckle (716) and the upper buckle (717); under the explosion pressure, the pre-movement plug plate (711) first drives the telescopic tongue plate (715) and the lower buckle (716) to move, so that the telescopic tongue plate (715) is inserted into the side wall tooth groove (702), at which time the lower buckle (716) and the upper buckle (717) are separated to release the limit, and then the piston column (705) moves downward again.

9. The engineering foundation pile detection device according to claim 8, characterized in that: A limiting annular rim (718) and a limiting semi-arc platform (719) are fixedly arranged on the inner wall surface of the driving chamber (704), and the limiting annular rim (718) and the limiting semi-arc platform (719) respectively limit the upper and lower positions of the piston column (705).

10. The engineering foundation pile detection device according to claim 1, characterized in that: An annular boss (201) is coaxially fixedly disposed at the bottom of the cavity tooth column (2), a conducting ring (202) is disposed on the annular boss (201), and the conducting ring (202) is connected to the first pressure sensor (6) in an electrical circuit; A telescopic box (203) is fixedly arranged on the inner wall of the structural outer frame (7), and an elastically telescopic and movable connecting contact shaft (204) is arranged on the telescopic box (203). The connecting contact shaft (204) is in sliding contact with the conducting ring (202), so that the first pressure sensor (6) is connected to an external circuit through the conducting ring (202) and the connecting contact shaft (204).

Images