An explosive pneumatic hammer device and method for penetration testing or dynamic compaction.

Abstract

The invention provides an explosive air hammer device and method for sounding or strong compaction, which relates to the technical field of geotechnical engineering. The device comprises a base, on which an explosive air hammer, a distance sensor and a fuel supply system are installed. The explosive air hammer comprises an air hammer cylinder, an air hammer piston, an air hammer piston rod and an air hammer spring. The cylinder head of the air hammer cylinder faces upward, and the air hammer piston divides the air hammer cylinder into an upper chamber and a lower chamber. The lower end of the air hammer piston rod is connected to a hammer head, and a pressure sensor is arranged between the lower end of the air hammer piston rod and the hammer head. The fuel supply system is connected to the upper chamber of the air hammer cylinder, and an igniter is also arranged on the cylinder head of the air hammer cylinder. The fuel supply system, the distance sensor, the igniter and the pressure sensor are all connected to a controller to obtain the hammering depth, the hammering force and the number of hammering times. The device can be directly applied to a dynamic sounding test to evaluate soil properties, and can also be applied to strong compaction construction. Compared with a traditional standard penetration test or strong compaction device, the efficiency and quality of sounding or strong compaction can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of geotechnical engineering, and in particular to a device and method for penetration testing or dynamic compaction. Background Art

[0002] The standard penetration test (SPT) is a type of dynamic penetration test, referred to as SPT. The equipment used in the test mainly consists of a standard penetrator, a sounding rod and a core hammer, which is used to detect the bearing capacity of the foundation. The SPT cannot directly measure the physical and mechanical indicators of the foundation soil, but makes a comprehensive judgment by combining other in-situ tests and indoor test results. Through the accumulation of a large amount of engineering experience in the test area, the corresponding relationship is summarized. The main principle of the SPT is to use a 63.5kg core hammer, fix a drop distance of 76cm to let the core hammer fall freely, and use a certain drop hammer energy to penetrate the standard specification penetrator into the foundation soil. By measuring the number of hammer blows within the specified penetration (generally 30cm, pre-drilled 15cm), that is, the standard penetration blows, the soil properties in a certain area and a large amount of hammer blow test data are summarized and summarized to form a set of empirical formulas to evaluate the engineering properties of the soil.

[0003] Traditional standard penetration test equipment is very bulky, difficult to operate, backward in technology, and low in work efficiency, and cannot meet the development needs of today's society. Although the lifting height of the core hammer in the traditional standard penetration test is the same each time, the ground height is changing, and the geological bearing capacity is different. The same number of hammer strikes will result in different heights of foundation drop, and it is impossible to ensure that the height of each hammer strike is the same. Therefore, there will be an error in the height of the core hammer each time it falls. Factors such as the friction of the guide shaft in the traditional standard penetration test device, air resistance, and wind force will cause errors in the resistance of the core hammer each time it falls. Therefore, the evaluation of the engineering properties unearthed is also inaccurate.

[0004] During the construction of foundation engineering, it is usually necessary to tamp the ground to improve the strength of the foundation, that is, use a heavy hammer to fall freely from a certain height to tamp the soil layer to quickly consolidate the foundation, and rely on strong tamping energy and shock wave action to compact the soil layer, so as to improve the bearing capacity of the weak foundation. Traditional tamping devices are too large and have high requirements for construction operations. They need professional personnel and professional equipment to operate. Improper operation may cause construction quality problems and low work efficiency.

[0005] The use of the impact force generated by gas explosion as the driving force for vibration testing has been disclosed in the prior art. For example, Chinese invention patent application CN117232758A discloses a high-energy impact hammer based on gas explosion and a test method thereof, including a sealed cylinder and an explosion control panel, wherein the sealed cylinder is mounted on a base, a piston is arranged in the sealed cylinder, a reset spring is arranged on the piston, and a force measuring mechanism and a reset mechanism are arranged on the piston; the explosion control panel is connected to the sealed cylinder, and an exhaust and drainage mechanism, an air intake mechanism, an ignition mechanism, Distance measuring sensor, gas tank and control mechanism; the force measuring mechanism includes a force transmission rod, a force sensor, a sensor connector and a hammer head, the force transmission rod is connected to the piston, and the force sensor is installed between the force transmission rod and the hammer head; the reset mechanism includes a connecting rod and a reset spring, one end of the reset spring is against the cylinder top cover and the other end is against the piston. When the reset spring slides freely on the force transmission rod and the impact hammer is not working, the reset spring presses the piston to the bottom of the cylinder; the exhaust and drainage mechanism includes a solenoid valve, and the gas tank includes a compressed hydrogen tank and a compressed oxygen tank, which are respectively connected to the hydrogen intake solenoid valve and the oxygen intake solenoid valve.

[0006] However, since the methods and requirements of the vibration test of the product are completely different from those of the dynamic penetration test in geotechnical engineering, the above-mentioned high-energy impact hammer based on gas explosion cannot be directly applied to the dynamic penetration test. Summary of the invention

[0007] In view of the above shortcomings of the prior art, the technical problem to be solved by the present invention is to provide an explosive air hammer device for probing or tamping to improve the efficiency and quality of probing or tamping.

[0008] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0009] The invention provides an explosive air hammer device for probing or strong tamping, comprising a base, on which an explosive air hammer, a distance sensor and a fuel supply system are installed; the explosive air hammer comprises an air hammer cylinder, an air hammer piston, an air hammer piston rod and an air hammer spring, the cylinder head of the air hammer cylinder faces upward, the air hammer piston rod extends downward from the bottom of the air hammer cylinder, the air hammer piston divides the air hammer cylinder into an upper chamber and a lower chamber, the air hammer spring is sleeved on the air hammer piston rod and is located in the lower chamber of the air hammer cylinder, the lower end of the air hammer piston rod is connected to a hammer head, and a pressure sensor is arranged between the lower end of the air hammer piston rod and the hammer head; the fuel supply system is communicated with the upper chamber of the air hammer cylinder, an igniter is also arranged on the cylinder head of the air hammer cylinder, and the fuel supply system, the distance sensor, the igniter and the pressure sensor are all connected to a controller.

[0010] Preferably, the fuel supply system includes a hydrogen cylinder, an oxygen cylinder and a mixed gas cylinder. The hydrogen cylinder is connected to the mixed gas cylinder through a hydrogen pipe, and a hydrogen flowmeter is provided on the hydrogen pipe; the oxygen cylinder is connected to the mixed gas cylinder through an oxygen pipe, and an oxygen flowmeter is provided on the oxygen pipe; the mixed gas cylinder is connected to the cylinder head of the air hammer cylinder through the mixed gas pipe, and a mixed gas flowmeter is provided on the mixed gas pipe. The hydrogen flowmeter, oxygen flowmeter and mixed gas flowmeter are all connected to the controller.

[0011] Furthermore, a groove is provided at the lower end of the air hammer piston rod, and the pressure sensor is located in the groove.

[0012] Preferably, the lower end of the air hammer piston rod is connected to a bolt via a nut, and the hammer head is connected to the bolt.

[0013] Preferably, a plurality of connecting ear plates are provided on the outer wall of the air hammer cylinder, a plurality of suspension cylinders are provided on the base, and the piston rods of the suspension cylinders are connected to the connecting ear plates.

[0014] Preferably, an exhaust port is provided on the cylinder cover of the pneumatic hammer cylinder, and a solenoid valve is provided on the exhaust port, and the solenoid valve is connected to the controller.

[0015] Preferably, the base is an engineering vehicle.

[0016] The present invention also provides a method for performing penetration testing using the explosive gas hammer device, comprising the following steps:

[0017] S1: Move the explosive gas hammer device to the probing position so that the hammer head is located directly above the penetrator;

[0018] S2: The fuel supply system delivers fuel to the upper chamber of the air hammer cylinder;

[0019] S3: Turn on the switch of the igniter to make the fuel in the upper chamber explode, push the piston of the air hammer downward, and the hammer head hits the penetrator;

[0020] S4: the pressure sensor feeds back the detected hammering force to the controller, and the distance sensor feeds back the detected depth of the penetrator to the controller;

[0021] S5: After the hammering is completed, the restoring force of the air hammer spring pushes the air hammer piston to reset, and the hammer head resets;

[0022] S6: Repeat steps S2-S5 until the penetrator is hammered to a preset depth, and the controller records the total number of hammering times.

[0023] Preferably, in step S1, the explosive air hammer is adjusted to a suitable height by a hanging cylinder connected to the base.

[0024] The present invention further provides a method for performing strong compaction using the explosive air hammer device, comprising the following steps:

[0025] S1: Move the explosive air hammer device to the tamping position;

[0026] S2: The fuel supply system delivers fuel to the upper chamber of the air hammer cylinder;

[0027] S3: Turn on the switch of the igniter, the fuel in the upper chamber explodes, pushing the piston of the air hammer downward, and the hammer head hits the ground to tamp the ground;

[0028] S4: After the hammering is completed, the restoring force of the air hammer spring pushes the air hammer piston to reset, and the hammer head resets;

[0029] S5: Repeat steps S1-S4 until the ground is tamped to a preset hardness.

[0030] The present invention has the following beneficial effects: the present invention provides an explosive air hammer device and method for sounding or strong compaction, the cylinder head of the air hammer cylinder faces upward, the air hammer piston rod extends downward from the bottom of the air hammer cylinder, the fuel supply system is connected to the upper chamber of the air hammer cylinder, an igniter is installed on the cylinder head of the air hammer cylinder, the fuel supply system, the distance sensor, the igniter and the pressure sensor are all connected to a controller to obtain the hammer depth, the hammer force and the number of hammer strikes, which can be directly applied to the dynamic sounding test to evaluate the soil properties. At the same time, by increasing the fuel required for the explosion, it can also be applied to strong compaction construction. Compared with the traditional standard penetration test or strong compaction device, the efficiency and quality of sounding or strong compaction can be improved.

[0031] In the preferred embodiment of the present invention, a suspension cylinder is used to realize the connection between the explosive air hammer and the base. When hammering, the reaction force generated by the explosive air hammer is buffered by the suspension cylinder, thereby reducing the vibration of the base and improving the stability and safety of the explosive air hammer device. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a front view of the explosive gas hammer device of the present invention.

[0033] Figure 2 It is a top view of the explosive gas hammer device of the present invention.

[0034] Figure 3 It is a cross-sectional view of the explosive air hammer in the present invention.

[0035] Figure 4 It is a cross-sectional view of the suspension cylinder in the present invention.

[0036] Figure 5 It is a schematic diagram of the connection between the suspension cylinder and the explosive air hammer in the present invention.

[0037] Description of Reference Numerals

[0038] 1 Base

[0039] 2 Explosive Hammer

[0040] 21 Pneumatic Hammer Cylinder

[0041] 211 Cylinder head

[0042] 212 Upper chamber

[0043] 213 Lower cavity

[0044] 214 Connecting ear plate

[0045] 2141 Through hole

[0046] 215 Exhaust port

[0047] 22 Pneumatic hammer piston rod

[0048] 221 Groove

[0049] 23 Pneumatic hammer piston

[0050] 24 Pneumatic hammer spring

[0051] 3 Hammer

[0052] 4 Distance Sensor

[0053] 5 Fuel supply system

[0054] 51 Hydrogen Bottle

[0055] 511 Hydrogen Pipe

[0056] 512 Hydrogen Flow Meter

[0057] 52 oxygen cylinder

[0058] 521 Oxygen Tube

[0059] 522 Oxygen Flow Meter

[0060] 53 Mixed gas cylinder

[0061] 531 Mixing pipe

[0062] 532 Mixed gas flow meter

[0063] 6 Ignition

[0064] 7 Controller

[0065] 8 Suspension cylinder

[0066] 81 Cylinder barrel

[0067] 811 Trachea connection hole

[0068] 82 Cylinder Spring

[0069] 83 Piston rod

[0070] 9 Nut

[0071] 91 Boss

[0072] 10 Bolts

[0073] 11. Solenoid valve

[0074] 12. Pressure sensor DETAILED DESCRIPTION

[0075] The specific embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings. These embodiments are only used to illustrate the present invention, but not to limit the present invention.

[0076] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0077] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0078] Furthermore, in the description of the present invention, unless otherwise specified, “plurality” means two or more.

[0079] The present invention provides an explosive air hammer device and method for probing or compaction. Figures 1 to 3The explosive air hammer device of the present invention comprises a base 1, on which an explosive air hammer 2, a distance sensor 4, a fuel supply system 5 and a plurality of suspension cylinders 8 are installed. The base 1 can be a device such as an engineering vehicle that can carry the above components; the explosive air hammer 2 comprises an air hammer cylinder 21 and an air hammer piston 23, the air hammer piston 23 divides the air hammer cylinder 21 into an upper chamber 212 and a lower chamber 213, the fuel supply system 5 is connected to the upper chamber 212 of the air hammer cylinder 21, and is used to provide a power source for the explosive air hammer 2; the cylinder head 211 of the air hammer cylinder 21 faces upward, and an exhaust port 215 is provided on the cylinder head 211, and an electromagnetic valve 11 is installed on the exhaust port 215; an igniter 6 is also installed on the cylinder head 211 of the air hammer cylinder 21; Figure 5 The hanging cylinder 8 is fixedly mounted on the base 1, and the explosive hammer 2 is connected to the base 1 by connecting with the piston rod 83 of the hanging cylinder 8. Figure 2 The distance sensor 4, the fuel supply system 5, the control valve of the suspension cylinder 8, the solenoid valve 11 and the igniter 6 are respectively connected to a controller 7 through cables. The controller 7 is installed on the base 1. When the base 1 adopts an engineering vehicle, the operating table of the engineering vehicle is also connected to the controller 7.

[0080] In one embodiment, Figure 2 The fuel supply system 5 includes a hydrogen cylinder 51, an oxygen cylinder 52 and a mixed gas cylinder 53 installed on the base 1. The hydrogen cylinder 51 is connected to the mixed gas cylinder 53 through a hydrogen pipe 511. The hydrogen pipe 511 is provided with a hydrogen flowmeter 512 for controlling the amount of hydrogen output from the hydrogen cylinder 51; the oxygen cylinder 52 is connected to the mixed gas cylinder 53 through an oxygen pipe 521. The oxygen pipe 521 is provided with an oxygen flowmeter 522 for controlling the amount of oxygen output from the oxygen cylinder 52; when the explosive air hammer device is used, hydrogen and oxygen first enter the mixed gas cylinder, which is conducive to the full and uniform mixing of hydrogen and oxygen, and can exert the maximum energy to drive the hammer head to hammer during combustion and explosion; Figure 3 An opening is provided on the cylinder head 211 of the air hammer cylinder 21, and the mixed gas bottle 53 is connected to the opening on the cylinder head 211 of the air hammer cylinder 21 through a mixed gas pipe 531. A mixed gas flow meter 532 is provided on the mixed gas pipe 531, which is used to control the amount of gas required to enter the upper chamber 212 of the explosive air hammer 2 from the mixed gas bottle 53. The hydrogen flow meter 512, the oxygen flow meter 522 and the mixed gas flow meter 532 are all flow meters with flow control function, and are all connected to the controller 7.

[0081] like Figure 3The explosive air hammer 2 also includes an air hammer piston rod 22 and an air hammer spring 24. The air hammer piston rod 22 extends downward from the bottom of the air hammer cylinder 21. The air hammer piston rod 22 can slide up and down in the lower chamber 213 of the air hammer cylinder 21. The air hammer spring 24 is sleeved on the air hammer piston rod 22 and is located in the lower chamber 213 of the air hammer cylinder 21. The lower end of the air hammer piston rod 22 is connected to a hammer head 3. After each hammering, the exhaust port 215 is opened to release the residual gas in the upper chamber 212. The compressed air hammer spring 24 automatically resets and drives the hammer head 3 to lift; a pressure sensor 12 is provided between the lower end of the air hammer piston rod 22 and the hammer head 3 for detecting the hammering force during each hammering. A groove 221 is provided at the lower end of the air hammer piston rod 22. The pressure sensor 12 is located in the groove 221. When the explosive air hammer device is in a natural state, the pressure sensor 12 is not subjected to pressure. The pressure sensor 12 and the pressure sensor 12 are as follows Figure 2 The controller 7 is shown connected to transmit the detected hammer force value to the controller 7.

[0082] In one embodiment, Figure 3 The lower end of the air hammer piston rod 22 is connected to a bolt 10 through a nut 9. The bottom of the nut 9 protrudes inward to form an annular boss 91. The head of the bolt 10 is located in the inner hole of the nut 9 and rests on the boss 91. The upper part of the nut 9 is connected to the outer wall of the lower end of the air hammer piston rod 22 through a thread. A threaded hole is provided at the upper end of the hammer head 3 for fixed connection with the bolt 10, thereby realizing the fixed connection between the hammer head 3 and the air hammer piston rod 22; the distance between the bottom surface of the air hammer piston rod 22 and the top surface of the boss 91 is slightly larger than the thickness of the bolt 10 head, so that the bolt 10 can slide slightly up and down in the inner hole of the nut 9 to ensure that the pressure sensor 12 is not under pressure when the explosive air hammer device is in a natural state, thereby ensuring that the measured hammering force is accurate.

[0083] like Figure 4 The suspension cylinder 8 also includes a cylinder barrel 81 and a cylinder spring 82. The cylinder spring 82 is installed between the inner wall of the upper end of the cylinder barrel 81 and the cylinder piston, and can buffer the reaction force generated when the explosive air hammer 2 strikes. An air pipe connecting hole 811 is provided on the side wall of the lower end of the cylinder barrel 81. The air pipe connecting hole 811 is connected to the air compressor through an air pipe. A control valve is provided on the air pipe to control the extension and retraction of the piston rod 83 of the suspension cylinder 8, thereby realizing the adjustment of the height of the explosive air hammer 2. This is a well-known technology in the art and will not be repeated here.

[0084] like Figure 3 and Figure 5A plurality of connecting ear plates 214 are provided on the outer wall of the air hammer cylinder 21, and a through hole 2141 is provided on the connecting ear plate 214. The diameter of the lower end portion of the piston rod 83 of the suspension cylinder 8 is smaller than the diameter of the upper end portion, so that the piston rod 83 can be inserted into the through hole 2141 of the connecting ear plate 214 and stop on one end surface of the through hole 2141. A thread is provided on the outer wall of the lower end of the piston rod 83, and the connecting ear plate 214 of the air hammer cylinder 21 is tightened onto the piston rod 83 of the suspension cylinder 8 by a nut.

[0085] This device can collect the hammer depth, hammer force, record the total number of hammer blows, and then directly apply it to the dynamic penetration test through empirical formulas. Compared with traditional standard penetration test devices, it can improve the efficiency and quality of penetration testing.

[0086] Furthermore, the present invention also provides a method for performing dynamic probing using the explosive gas hammer device, comprising the following steps:

[0087] S1: Move the explosive gas hammer device to the probing position so that the hammer head 3 is located directly above the penetrator;

[0088] The piston rod 83 of the suspension cylinder 8 on the base 1 is adjusted to extend and retract by the controller 7 to adjust the explosive air hammer 2 to a desired height;

[0089] A distance sensor 4 , such as a laser radar, mounted on the base 1 detects the initial position of the penetrator and feeds the data back to the controller 7 .

[0090] S2: The fuel supply system 5 quantitatively delivers the gas used for explosion to the upper chamber 212 of the air hammer cylinder 21: the controller 7 sends a signal to the hydrogen flowmeter 512 and the oxygen flowmeter 522, and controls the hydrogen and oxygen to flow into the mixed gas bottle 53 through the hydrogen pipe 511 and the oxygen pipe 521 in a gas volume of 2:1 as needed; the controller 7 sends a signal to the mixed gas flowmeter 532 to control the mixed gas of hydrogen and oxygen in the mixed gas bottle 53 to be delivered to the upper chamber 212 through the mixed gas pipe 531.

[0091] S3: The controller 7 controls the switch of the igniter 6 to turn on, causing the fuel in the upper chamber 212 to explode, pushing the air hammer piston 23 to move downward, and the hammer head 3 hammers the penetrator.

[0092] S4: The pressure sensor 12 feeds back the detected hammering force to the controller 7, and the distance sensor 4 feeds back the detected depth of the penetrator to the controller 7.

[0093] S5: After the hammering is finished, the controller 7 controls the solenoid valve 11 to open, releasing the residual gas generated after the explosion in the upper chamber 212, and the restoring force of the air hammer spring 24 pushes the air hammer piston 23 to reset, and the hammer head 3 is reset;

[0094] During an explosion, the air hammer piston rod 22 rapidly descends and strikes, and the air hammer cylinder 21 generates an upward reaction force, driving the piston rod 83 to move upward. The reaction force generated by the air hammer cylinder 21 is buffered by the cylinder spring 82, thereby reducing the vibration of the base 1 and improving the stability and safety of the explosive air hammer device. On the other hand, the upward movement of the piston rod 83 will cause the air in the piston chamber of the suspension cylinder 8 to compress and expand, and an exhaust hole can be set on the outer wall of the cylinder barrel 81 to form a medium compensation system.

[0095] S6: Repeat steps S2-S5, first pre-drive the penetrator 15 cm, then continue to hammer the penetrator, and drive the penetrator into the specified depth of 30 cm. The controller 7 records the total number of hammer blows within the specified depth. At this time, the controller 7 will record the total number of hammer blows, collect the hammer force and hammer depth of each time in the entire dynamic probing test, and substitute the data into the empirical formula for calculation to realize the evaluation of the engineering properties of the soil.

[0096] The calculation method adopted by the explosive air hammer device provided by the present invention when conducting sounding is different from that of the traditional standard penetration test. The device mainly measures two parameters, namely the number of hammer blows within a specified penetration (generally 30 cm, with a pre-drilling of 15 cm) and the hammer force measured at each hammer blow, and inputs them into a set of software to calculate the mechanical properties of rock and soil using an empirical formula, which is obtained through specific experiments and calculation development and design.

[0097] Furthermore, the present invention provides a method for strong compaction using the explosive air hammer device, comprising the following steps:

[0098] S1: Move the explosive air hammer device to the tamping position.

[0099] S2: The fuel supply system 5 delivers fuel to the upper chamber 212 of the air hammer cylinder 21.

[0100] S3: Turn on the switch of the igniter 6, the fuel in the upper chamber 212 explodes, pushing the air hammer piston 23 to move downward, the hammer head 3 hammers the ground, and tamping the ground. The air hammer cylinder 21 generates an upward reaction force, driving the piston rod 83 to move upward. The reaction force generated by the air hammer cylinder 21 is buffered by the cylinder spring 82, thereby reducing the vibration of the base 1 and improving the stability and safety of the explosive air hammer device. The base 1 can provide a reaction force during tamping, and the cylinder spring 82 can buffer the tamping reaction force. Therefore, the device can withstand a large explosion impact force and can perform strong tamping operations. It is smaller in size, lower in cost, and higher in efficiency than traditional strong tamping equipment.

[0101] S4: After the hammering is finished, the controller 7 controls the solenoid valve 11 to open, releasing the air pressure generated by the explosion in the upper chamber 212, and the restoring force of the air hammer spring pushes the air hammer piston 23 to reset, and the hammer head 3 is reset.

[0102] S5: Repeat steps S1-S4 until the ground is tamped to a preset hardness.

[0103] The power source for providing the hammering force of the present invention, that is, the fuel supply system 5 can also use solid or liquid fuel to achieve ignition and explosion.

[0104] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. An explosive air hammer device for probing or tamping, characterized in that: The invention comprises a base (1), on which an explosive air hammer (2), a distance sensor (4) and a fuel supply system (5) are mounted; the explosive air hammer (2) comprises an air hammer cylinder (21), an air hammer piston rod (22), an air hammer piston (23) and an air hammer spring (24); the cylinder head (211) of the air hammer cylinder (21) faces upward, the air hammer piston rod (22) extends downward from the bottom of the air hammer cylinder (21), the air hammer piston (23) divides the air hammer cylinder (21) into an upper chamber (212) and a lower chamber (213); the air hammer spring (24) is sleeved on the air hammer piston rod (22) and is located in the lower chamber (213) of the air hammer cylinder (21); the air hammer piston rod (22) The lower end is connected to a hammer head (3), and a pressure sensor (12) is provided between the lower end of the air hammer piston rod (22) and the hammer head (3); a groove (221) is provided at the lower end of the air hammer piston rod (22), and the pressure sensor (12) is located in the groove (221); when the explosive air hammer device is in a natural state, the pressure sensor (12) is not subjected to pressure; the fuel supply system (5) is communicated with the upper chamber (212) of the air hammer cylinder (21), and an igniter (6) is also installed on the cylinder head (211) of the air hammer cylinder (21); the fuel supply system (5), the distance sensor (4), the igniter (6) and the pressure sensor (12) are all connected to a controller (7).

2. The explosive gas hammer device according to claim 1, characterized in that: The fuel supply system (5) comprises a hydrogen cylinder (51), an oxygen cylinder (52) and a mixed gas cylinder (53); the hydrogen cylinder (51) is connected to the mixed gas cylinder (53) via a hydrogen pipe (511), and the hydrogen pipe (511) is provided with a hydrogen flowmeter (512); the oxygen cylinder (52) is connected to the mixed gas cylinder (53) via an oxygen pipe (521), and the oxygen pipe (521) is provided with an oxygen flowmeter (522); the mixed gas cylinder (53) is connected to the cylinder head (211) of the air hammer cylinder (21) via a mixed gas pipe (531), and the mixed gas pipe (531) is provided with a mixed gas flowmeter (532); the hydrogen flowmeter (512), the oxygen flowmeter (522) and the mixed gas flowmeter (532) are all connected to the controller (7).

3. The explosive gas hammer device according to claim 1, characterized in that: The lower end of the air hammer piston rod (22) is connected to a bolt (10) via a nut (9), and the hammer head (3) is connected to the bolt (10).

4. The explosive gas hammer device according to claim 1, characterized in that: A plurality of connecting ear plates (214) are provided on the outer wall of the air hammer cylinder (21), a plurality of suspension cylinders (8) are provided on the base (1), and the piston rods (83) of the suspension cylinders (8) are connected to the connecting ear plates (214).

5. The explosive gas hammer device according to claim 1, characterized in that: An exhaust port (215) is provided on the cylinder cover (211) of the air hammer cylinder (21), and an electromagnetic valve (11) is provided on the exhaust port (215), and the electromagnetic valve (11) is connected to the controller (7).

6. The explosive gas hammer device according to claim 1, characterized in that: The base (1) is an engineering vehicle.

7. A method for performing penetration testing using the explosive gas hammer device according to claim 1, characterized in that: The following steps are involved: S1: Move the explosive gas hammer device to the probing position so that the hammer head (3) is located directly above the penetrator; S2: The fuel supply system (5) delivers fuel to the upper chamber (212) of the air hammer cylinder (21); S3: turning on the switch of the igniter (6) to cause the fuel in the upper chamber (212) to explode, pushing the air hammer piston (23) to move downward, and the hammer head (3) to strike the penetrator; S4: the pressure sensor (12) feeds back the detected hammering force to the controller (7), and the distance sensor (4) feeds back the detected penetration depth of the penetrator to the controller (7); S5: After the hammering is completed, the restoring force of the air hammer spring (24) pushes the air hammer piston (23) to return to its original position, and the hammer head (3) is returned to its original position; S6: Repeat steps S2-S5 until the penetrator is hammered to a preset depth, and the controller (7) records the total number of hammering times.

8. The method for probing according to claim 7, characterized in that: In step S1, the explosive air hammer (2) is adjusted to a suitable height by means of a suspension cylinder (8) connected to the base (1).

9. A method for strong compaction using the explosive air hammer device according to claim 1, characterized in that: The following steps are involved: S1: Move the explosive air hammer device to the tamping position; S2: The fuel supply system (5) delivers fuel to the upper chamber (212) of the air hammer cylinder (21); S3: The switch of the igniter (6) is turned on, and the fuel in the upper chamber (212) explodes, pushing the air hammer piston (23) to move downward, and the hammer head (3) hammers the ground to tamp the ground; S4: After the hammering is completed, the restoring force of the air hammer spring (24) pushes the air hammer piston (23) to return to its original position, and the hammer head (3) returns to its original position; S5: Repeat steps S1-S4 until the ground is tamped to a preset hardness.

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