Dynamic penetration test device and test method

Abstract

The invention relates to the technical field of geotechnical engineering investigation, and particularly discloses a dynamic penetration test device and method, and the dynamic penetration test device comprises an automatic drop hammer device which comprises a drop hammer rod and at least surface insulation; the stroke monitoring device comprises two pin rollers, one pin roller is provided with a through hole, and a photoelectric transmitter and a photoelectric receiver are arranged on the two sides of the through hole respectively; the data acquisition instrument is respectively connected with the heavy hammer and the unhooking device to form a hammering closed circuit; the photoelectric transmitter and the photoelectric receiver are respectively connected; when the heavy hammer is separated from the unhooking device, the hammering closed circuit is powered off, and the data acquisition instrument counts the hammering number once; and when the roller is hammered for multiple times and rotates for one circle, the photoelectric receiver receives the optical signal of the photoelectric emitter again, and the data acquisition instrument obtains the total hammering number corresponding to the circumference stroke of the roller. According to the dynamic penetration test device and the test method, the technical problems of high cost, complex principle and easy interference are solved.

Description

Technical Field

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

[0002] At present, the dynamic penetration test has been widely used in various soil layers as a continuous test of the physical and mechanical parameters of the soil layer in geotechnical engineering investigation. The test principle is to use a certain drop hammer energy to drive the probe connected to the probe rod into the soil, and judge the engineering properties of the soil according to the difficulty of driving (that is, the number of hammer blows required for the probe to enter the soil layer 10cm). It is an in-situ test method. The dynamic penetration test is widely used in geotechnical engineering investigation. According to the dynamic penetration test indicators, mechanical stratification can be carried out, the uniformity and physical properties (state, density) of the soil, the strength of the soil, deformation parameters, foundation bearing capacity, single pile bearing capacity can be evaluated, soil holes, soft and hard soil layer interfaces can be found, and the foundation treatment effect can be detected. The dynamic penetration test uses an automatic drop hammer device, which is divided into three types according to the hammer energy: light, heavy and super heavy, and the corresponding drop hammer masses are 10kg, 63.5kg and 120kg respectively.

[0003] In the related technology, the number of blows in the dynamic penetration test is recorded by manually marking a scale every 10cm on the drill rod, and then manually counting the number of blows required for the probe to enter the soil layer 10cm within a certain depth. The penetration depth of each survey operation is determined according to the thickness of the soil layer and the survey technical requirements. Generally, the minimum is not less than 30cm, and the maximum can range from 5 to 20m. The recorder needs to count the number of dynamic penetration blows while observing whether the drill rod has reached the marked scale. When encountering a stratum that is difficult for the probe to enter, that is, when the number of blows required for the probe to enter the soil layer 10cm is large or the one-time penetration depth needs to be large, it is easy to record errors; manual recording will also consume more manpower; the manual recording process may lack certain management and supervision, and the quality of the survey cannot be guaranteed.

[0004] In order to solve the above problems, patent CN110095588B discloses automatic data collection equipment for cone dynamic probing test, which captures the number of times the core hammer falls and rises through an inductive sensor, and each fall and rise is counted as one hammer blow. The penetration depth of the cone probe is automatically recorded through a laser instrument in conjunction with a laser reflector.

[0005] However, this technical solution has the following disadvantages:

[0006] ① Many accessories need to be added, and the cost of accessories is high, so the economic benefits are low;

[0007] ② The principle is complicated, the operation steps are cumbersome, and it is not suitable for large-scale promotion on site;

[0008] ③ Using inductive sensors, lasers and other methods that tend to be virtual and signal sensing, the signal is easily affected by external interference and is likely to be inaccurate, and the accuracy of this method is unstable. Summary of the invention

[0009] The present application provides a dynamic penetration test device and test method to solve the technical problems of high cost, complex principle, and susceptibility to interference.

[0010] In a first aspect, an embodiment of the present application provides a dynamic penetration test device, comprising:

[0011] An automatic hammer drop device, comprising a hammer drop rod for guiding the heavy hammer and the unhooking device to slide up and down, wherein at least the surface of the hammer drop rod is insulated;

[0012] The stroke monitoring device comprises two rollers which are clamped and symmetrically arranged on both sides of the drill rod of the automatic drop hammer device, one of the rollers is provided with a through hole parallel to the axis, and a photoelectric transmitter and a photoelectric receiver are respectively arranged on both sides of the through hole;

[0013] The data acquisition instrument is connected to the weight and the unhooking device through electric wires to form a hammer closed circuit; it is also connected to the photoelectric transmitter and the photoelectric receiver respectively; when the weight and the unhooking device are separated, the hammer closed circuit is powered off, and the data acquisition instrument counts the number of hammer strikes once; when the hammer strikes multiple times and the drill rod goes down and drives the roller to rotate one circle cumulatively, the photoelectric receiver receives the light signal of the photoelectric transmitter again, and the data acquisition instrument obtains the total number of hammer strikes corresponding to the circumference of the roller.

[0014] In combination with the first aspect, in one embodiment, the two rollers are supported and installed by a drill rod holder, the drill rod holder comprises a horizontal plate and two pairs of vertical support plates, a drill rod avoidance hole is arranged in the center of the horizontal plate, and each pair of vertical support plates supports the central axis of one roller;

[0015] The photoelectric transmitter and the photoelectric receiver are arranged on the top surfaces of a pair of vertical support plates.

[0016] In combination with the first aspect, in one embodiment, the data acquisition instrument is used to record a plurality of total hammer blows corresponding to a plurality of roller circumference strokes respectively; the data acquisition instrument is provided with a reset button, and the reset button is used to reset historical data.

[0017] In combination with the first aspect, in one implementation, the circumference of the roller is designed to be 10 cm, and the diameter of the roller is 3.1831 cm.

[0018] In combination with the first aspect, in one embodiment, the drop hammer rod is made of an insulating material or an insulating material is sprayed on its surface.

[0019] In combination with the first aspect, in one embodiment, the travel monitoring device further includes a level meter, and the level meter is arranged on the top surface of the horizontal plate.

[0020] In combination with the first aspect, in one embodiment, the horizontal plate is horizontally fixed on a support frame, and the bottom end of the support frame is fixed on the land to be measured;

[0021] The unhooking device is connected to the upper steel wire rope, and the steel wire rope is lifted by the drilling rig power device to drive the unhooking device to move upward. After reaching a certain height, the unhooking device is automatically separated from the heavy hammer.

[0022] In a second aspect, an embodiment of the present application provides a test method based on the above-mentioned dynamic penetration test device, comprising the steps of:

[0023] In the initial state, the weight rises to a certain height, and the photoelectric receiver can receive the light signal of the photoelectric transmitter;

[0024] The unhooking device is separated from the heavy hammer, the hammer closed circuit is disconnected, and the data acquisition instrument counts the number of hammer blows once;

[0025] The heavy hammer falls and strikes, and the probe of the automatic hammer drop device moves downward; at the same time, the drill rod drives the roller to rotate, and the photoelectric receiver cannot receive the light signal of the photoelectric transmitter;

[0026] The hammering is repeated for many times until the roller rolls one circle and the photoelectric receiver receives the light signal of the photoelectric transmitter again; the data acquisition instrument obtains the total number of hammering corresponding to the circumference of the roller.

[0027] In combination with the second aspect, in one implementation, at any time, when the photoelectric transmitter fails, the data acquisition instrument issues an alarm.

[0028] In combination with the second aspect, in one embodiment, the data acquisition instrument records the total number of hammer blows corresponding to each roller circumference stroke, and can store multiple total number of hammer blows corresponding to multiple roller circumference strokes respectively;

[0029] The data acquisition instrument is provided with a reset button, and after completing an exploration work, the historical data can be reset by the reset button.

[0030] The beneficial effects brought by the technical solution provided by the embodiment of the present application include at least:

[0031] 1. The dynamic probing test device of the present application is cleverly designed, integrating the two aspects of blow count recording and depth monitoring in one; a data acquisition instrument, electric wires, a heavy hammer and a decoupling device form a hammer closed circuit, and in order to make the hammer closed circuit switchable, the surface of the drop hammer rod is at least insulated; after such a configuration, the number of disconnections of the hammer closed circuit is used to represent the number of hammer blows in the dynamic probing test, and the data acquisition instrument is used to record the cumulative number of the hammer blows; rollers are clamped on both sides of the drill rod of the automatic drop hammer device, and the rotation of the rollers represents the downward stroke of the drill rod, and a through hole parallel to the axis is opened in the roller, and a photoelectric transmitter and a photoelectric receiver are respectively arranged on both sides of the through hole, and the photoelectric transmitter emits a light signal, and the photoelectric receiver receives the light signal. In the initial state of the stroke monitoring device, the light signal emitted by the photoelectric transmitter passes through the through hole of the roller to the photoelectric receiver; when the hammering work starts, the photoelectric receiver receives the light signal of the photoelectric transmitter again, which means that the roller has rolled one circle after multiple hammerings, and also means that the drill rod has moved downward by one roller circumference. The data acquisition instrument obtains the total number of hammerings corresponding to the roller circumference stroke, and the data can be used directly to judge the engineering properties of the soil.

[0032] The dynamic penetration test device of the present application adds fewer accessories, adopts a method with simple principle, convenient operation and high accuracy. On the one hand, it automatically records the dynamic penetration test depth by setting the circumference of the roller (usually 10cm), and on the other hand, it records the number of disconnections of the hammer closed circuit as the number of hammer blows. The two are integrated to form a complete and accurate set of dynamic penetration test records, which solves the problem that the dynamic penetration test records have long been manually completed and prone to errors and require more manpower and material resources for real-time recording and supervision. At the same time, compared with the technical solution of combining inductive sensors and lasers, the cost is lower; at the same time, the roller circumference is used to represent the downward stroke of the drill rod, and the hammer closed circuit is used to represent the cumulative number of hammer blows, and the principle is simple; further, the hammer closed circuit and the photoelectric signal via-hole reception are both accurate and reliable, and compared with the technical solution of combining virtual and signal-sensitive inductive sensors and lasers, it has strong anti-interference ability.

[0033] 2. The test method of the present application has a simple process logic. In the initial state, the photoelectric receiver can receive the light signal of the photoelectric transmitter and repeat the hammering for many times. Each time the hammering is struck, the hammering closed circuit will be disconnected once, and the data acquisition instrument will accumulate the count once, until the roller rolls a circle, and the photoelectric receiver receives the light signal of the photoelectric transmitter again, indicating that the contact probe of the automatic drop hammer device has moved down one roller circumference, and the data acquisition instrument obtains the total number of hammerings corresponding to the roller circumference stroke; the test method of the present application accurately and completely records the number of power-offs of the hammering closed circuit through the data acquisition instrument and stores it in the data acquisition instrument, which not only ensures that the data will not be wrong, but also saves a certain amount of manpower; the number of hammerings is counted by opening and closing the circuit. The circuit will be disconnected for a certain period of time, and the correct recording of the number of hammerings will not be affected by circuit connection problems. The penetration depth is recorded by the friction rotation of the fixed pulley and the drill pipe. This method has a high accuracy rate and is unlikely to have abnormalities.

[0034] The test method of the present application forms a complete dynamic penetration test record by integrating the automatic recording of dynamic penetration depth and the automatic counting of hammer blows, which saves the energy of on-site recorders and avoids the possibility of errors or data falsification due to manual recording on site. It is low-cost, simple in principle, easy to operate, and highly accurate. Furthermore, after being stored as electronic data, it can be copied and pasted or directly imported when input into geotechnical engineering survey software, which improves the work efficiency of processing on-site survey data. At the same time, the stored dynamic penetration test data can be provided to project quality control personnel, project leaders, company quality departments, including relevant departments at all levels who conduct quality inspections of the project in the later stage for review and inspection, etc., and a certain quality control effect is also achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0036] Figure 1 A schematic diagram of a dynamic penetration test device provided in an embodiment of the present application;

[0037] Figure 2 A top view of the relative positions of the stroke monitoring device and the drop hammer rod provided in an embodiment of the present application;

[0038] Figure 3 A flowchart of a depth hit count recording method provided in an embodiment of the present application;

[0039] In the figure: 100, automatic drop hammer device; 1, heavy hammer; 2, hammer seat; 3, drop hammer rod; 4, drill rod; 5, touch probe; 6, unhooking device; 7, wire rope; 8, data acquisition instrument; 9, travel monitoring device; 10, electric wire; 91, roller; 92, drill rod holder; 93, photoelectric transmitter; 94, photoelectric receiver; 95, level; 921, vertical support plate; 922, horizontal plate. DETAILED DESCRIPTION

[0040] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0041] The present application provides a dynamic penetration test device and a depth strike recording method to solve the technical problems of high cost, complex principle, and susceptibility to interference.

[0042] The dynamic penetration test device of the present application provides a device with simple principle and equipment, easy operation and low installation cost. It determines whether the roller 91 rotates one circle by passing the optical signal through the circular hole, is basically not interfered by the outside world, and has strong anti-interference ability. More importantly, the number of hammer blows is counted by the number of disconnections of the hammer closed circuit, and the roller circumference stroke is counted by the stroke monitoring device. The total number of hammer blows corresponding to the roller circumference stroke is directly obtained by integration, and the engineering properties of the soil can be directly judged by the data.

[0043] First, as Figure 1 and Figure 2 As shown, the present application discloses an embodiment of a dynamic penetration test device, which includes an automatic drop hammer device 100, a stroke monitoring device 9, and a data acquisition device 8.

[0044] The automatic hammer drop device 100 includes a hammer drop rod 3 for guiding the weight 1 and the unhooking device 6 to slide up and down, and the hammer drop rod 3 is at least surface insulated. The hammer drop rod 3, which is at least surface insulated, lays the foundation for the closing and opening of the hammer closed circuit.

[0045] Specifically, the heavy hammer 1 and the unhooking device 6 are both made of steel and are used to hammer the conductor in the closed circuit. Figure 1 The positions marked by the middle unhooking device 6 and the heavy hammer 1 are respectively connected to the circuit, and the circuit is connected to the data acquisition instrument. The number of times the circuit is disconnected is recorded as the number of hammer blows.

[0046] The travel monitoring device 9 comprises two rollers 91, which are clamped and symmetrically arranged on both sides of the drill rod 4 of the automatic drop hammer device 100. The axis of the drill rod 4 is vertical, and the axes of the two rollers 91 are horizontal. When the drill rod 4 is struck by the heavy hammer 1 and moves downward, the rollers 91 on both sides of the drill rod 4 roll accordingly, and then the rolling of the rollers 91 is used to quantify the downward travel of the drill rod 4. One of the rollers 91 has a through hole parallel to its own axis, and the length of the through hole is equal to the spacing between the two circular side end faces. A photoelectric transmitter 93 and a photoelectric receiver 94 are respectively arranged on both sides of the through hole. The photoelectric transmitter 93 is used to emit a light signal, and the photoelectric receiver 94 is used to receive a light signal. In the initial state of the travel monitoring device 9, the light signal emitted by the photoelectric transmitter 93 passes through the through hole of the roller 91 to the photoelectric receiver 94; when the hammering work starts, the photoelectric receiver 94 receives the light signal of the photoelectric transmitter 93 again, that is, the surface roller 91 rolls one circle, which also indicates that the drill rod 4 moves downward by one roller circumference.

[0047] The data acquisition instrument 8 is respectively connected to the weight 1 and the unhooking device 6 through the wire 10 to form a hammer closed circuit. When the weight 1 and the unhooking device 6 are connected, the hammer closed circuit is energized; when the weight 1 and the unhooking device 6 are separated, the hammer closed circuit is de-energized. Specifically, the data acquisition instrument 8 provides power to the hammer closed circuit so that the hammer closed circuit has a weak current. The data acquisition instrument 8 is also respectively connected to the photoelectric transmitter 93 and the photoelectric receiver 94, wherein the data acquisition instrument 8 is connected to the photoelectric receiver 94, and when the photoelectric receiver 94 receives the light signal, the data acquisition instrument 8 will be informed that it has received the light signal. The data acquisition instrument 8 is connected to the photoelectric transmitter 93, and can be informed that the photoelectric transmitter 93 fails and issue an alarm. Specifically, the data acquisition instrument 8 is respectively connected to the photoelectric transmitter 93 and the photoelectric receiver 94 through signal lines.

[0048] When the heavy hammer 1 and the unhooking device 6 are separated, the hammering closed circuit is powered off, and the data acquisition instrument 8 counts the number of hammering once; during the process of multiple hammering of the heavy hammer 1, the data acquisition instrument 8 accumulates the number. When the heavy hammer 1 hammers multiple times and the roller 91 rotates one circle, the photoelectric receiver 94 receives the light signal of the photoelectric transmitter 93 again, and the data acquisition instrument 8 obtains the total number of hammering corresponding to the circumference of the roller.

[0049] The dynamic probing test device of the present application is cleverly designed, integrating the two aspects of blow count recording and depth monitoring into one; a data acquisition instrument 8, an electric wire 10, a heavy hammer 1 and a decoupling device 6 form a hammer closed circuit, and in order to make the hammer closed circuit switchable, the drop hammer rod 3 is at least surface-insulated; after such a setting, the number of hammer blows in the dynamic probing test is represented by the number of disconnections of the hammer closed circuit, and is cumulatively recorded by the data acquisition instrument 8; rollers 91 are clamped on both sides of the drill rod 4 of the automatic drop hammer device 100, and the rollers 91 are rotated to represent the downward stroke of the drill rod 4, and a through hole parallel to the axis is opened in the roller 91, and a photoelectric transmitter 93 and a photoelectric receiver 94 are respectively arranged on both sides of the through hole, and the photoelectric transmitter 93 emits a light signal, and the photoelectric receiver 94 receives the light signal. In the initial state of the stroke monitoring device 9, the light signal emitted by the photoelectric transmitter 93 passes through the through hole of the roller 91 to the photoelectric receiver 94; when the hammering work starts, the photoelectric receiver 94 receives the light signal of the photoelectric transmitter 93 again, which means that the roller 91 has rolled one circle cumulatively after multiple hammerings, and also means that the drill rod 4 has moved downward by one roller circumference. The data acquisition instrument obtains the total number of hammerings corresponding to the roller circumference stroke, and the data can be used directly to judge the engineering properties of the soil.

[0050] The dynamic penetration test device of the present application adds fewer accessories, adopts a method with simple principle, convenient operation and high accuracy. On the one hand, the dynamic penetration test depth is automatically recorded by setting the circumference of the roller (usually 10cm), and on the other hand, the number of disconnections of the hammer closed circuit is recorded as the number of hammer blows. The two are integrated to form a complete and accurate set of dynamic penetration test records, which solves the problem that the dynamic penetration test records have long been manually completed and prone to errors and require more manpower and material resources for real-time recording and supervision. At the same time, compared with the technical solution of combining inductive sensors and lasers, the cost is lower; at the same time, the roller circumference is used to represent the downward stroke of the drill rod 4, and the hammer closed circuit is used to represent the cumulative number of hammer blows, and the principle is simple; further, the hammer closed circuit and the photoelectric signal through-hole reception are both accurate and reliable, and compared with the technical solution of combining virtual and signal-sensitive inductive sensors and lasers, the anti-interference ability is strong.

[0051] like Figure 2 As shown, further, in one embodiment, two rollers 91 are supported and installed by a drill rod holder 92, and the drill rod holder 92 includes a horizontal plate 922 and two pairs of vertical support plates 921. An avoidance hole for the drill rod 4 is set in the center of the horizontal plate 922, and the vertical support plates 921 are set perpendicular to the horizontal plate 922, and each pair of vertical support plates 921 supports the central axis of a roller 91.

[0052] The photoelectric transmitter 93 and the photoelectric receiver 94 are arranged on the top surface of a pair of vertical support plates 921 .

[0053] Preferably, a triangular support plate may be provided between the horizontal plate 922 and the vertical support plate 921 to enhance the stability of the entire structure.

[0054] The dynamic probing test device of the present application has a simple structure of the stroke monitoring device 9, and uses a drill rod holder 92 to support two rollers 91. A photoelectric transmitter 93 and a photoelectric receiver 94 are directly arranged on the top surface of a pair of vertical support plates 921. The optical signal can pass through the through hole of the roller at the appropriate time to indicate that the drill rod has traveled a roller circumference downward, and the depth record of the dynamic probing test is accurate and reliable.

[0055] Furthermore, in one embodiment, the data acquisition device 8 is used to record multiple total hammer blows corresponding to multiple roller circumference strokes; for example, when the roller circumference stroke is 10 cm, the total hammer blows are 10 for the first 10 cm, and 15 for the second 10 cm; the engineering properties of the soil are judged by the total hammer blows corresponding to a single roller circumference stroke, and the changes in the engineering properties of the soil are judged by the total hammer blows corresponding to multiple roller circumference strokes.

[0056] The data acquisition instrument 8 is provided with a reset key, which is used to reset historical data. After completing an exploration, before the next exploration, the historical data can be reset by the reset key to prevent the data from occupying too much memory.

[0057] Preferably, the data collector 8 can export data to other mobile devices.

[0058] Furthermore, in one embodiment, the circumference of the roller is designed to be 10 cm, and the diameter of the roller 91 is 3.1831 cm.

[0059] Specifically, technicians in the exploration field most often use the number of hammer blows required for the probe to penetrate 10 cm into the soil layer to quantify the difficulty of penetrating the soil layer and determine the engineering properties of the soil.

[0060] Furthermore, in one embodiment, the drop hammer rod 3 is made of an insulating material or an insulating material is sprayed on its surface. The insulating setting of the drop hammer rod 3 is the basis for hammering a closed circuit. In order to prevent the drop hammer rod 3 from affecting the disconnection of the circuit (it is still conductive when the heavy hammer 1 and the unhooking device 6 are separated), it is deliberately insulated to prevent it from conducting electricity.

[0061] Furthermore, in one embodiment, the stroke monitoring device further comprises a level 95, which is disposed on the top surface of the horizontal plate 922. The level 95 is used to ensure that the entire stroke monitoring device is in a horizontal state. Matchingly, an instrument for ensuring verticality is disposed on the drill rod 4, and the two are matched to better ensure that the roller diameter reflects the downward stroke of the drill rod 4.

[0062] Specifically, the distance between the two rollers is slightly smaller than the outer diameter of the drill rod 4, that is, the outer circumferential surface of the roller is in close contact with the outer circumferential surface of the drill rod.

[0063] Furthermore, in one embodiment, the horizontal plate 922 is horizontally fixed on a support frame, the bottom end of the support frame is fixed on the land to be measured, and the support frame stably supports the horizontal plate 922 to form a structural foundation.

[0064] The unhooking device 6 is connected to the upper wire rope 7. The drilling rig power device lifts the wire rope to drive the unhooking device 6 to move upward. After reaching a certain height, the unhooking device 6 is automatically separated from the heavy hammer 1.

[0065] Specifically, the principle of automatic unhooking is often seen in the operating instructions of instruments and equipment, and will not be repeated here to complete a free-fall hammering of a heavy hammer.

[0066] Preferably, the lower part of the drop hammer rod 3 is a hammer seat 2 , the hammer seat 2 is connected to the drill rod 4 connected with the moving probe, and the touch probe 5 is arranged at the bottom end of the drill rod 4 .

[0067] The dynamic penetration test device of the present application only needs to add a few accessories, a fixed pulley to fix the drill rod, and a few wires to connect to the data acquisition instrument to achieve the test. It has fewer accessories, low cost, simple principle and easy operation.

[0068] Second, as Figure 3 As shown, the present application also discloses a test method based on the above-mentioned dynamic penetration test device, comprising the steps of:

[0069] In the initial state, the weight 1 rises to a certain height, and the photoelectric receiver 94 can receive the light signal of the photoelectric transmitter 93. The initial state is the state just before the hammer is ready to strike.

[0070] The unhooking device 6 is separated from the heavy hammer 1, the hammer closed circuit is disconnected, and the data acquisition instrument 8 counts the number of hammer blows once;

[0071] The heavy hammer 1 falls and strikes, and the probe head 5 of the automatic hammer drop device 100 drills through the soil layer and moves downward; at the same time, the drill rod 4 drives the roller 91 to rotate, and the through hole of the roller 91 is staggered with the photoelectric transmitter 93, so that the photoelectric receiver 94 cannot receive the optical signal of the photoelectric transmitter 93;

[0072] Repeat the hammering for many times. Each time the hammering is struck, the hammering closed circuit will be disconnected once, and the data acquisition instrument 8 will accumulate the count once; until the roller 91 rolls a circle, the photoelectric receiver 94 receives the light signal of the photoelectric transmitter 93 again, indicating that the contact probe 5 of the automatic drop hammer device 100 has moved down a roller circumference, and the data acquisition instrument 8 obtains the total number of hammering corresponding to the roller circumference travel.

[0073] The test method of the present application has a simple process logic. In the initial state, the photoelectric receiver 94 can receive the light signal of the photoelectric transmitter 93, and the hammering is repeated for many times. Each time the hammering is struck, the hammering closed circuit will be disconnected once, and the data acquisition instrument 8 will accumulate the count once, until the roller 91 rolls a circle, and the photoelectric receiver 94 receives the light signal of the photoelectric transmitter 93 again, indicating that the contact probe 5 of the automatic drop hammer device 100 has moved down a roller circumference, and the data acquisition instrument 8 obtains the total number of hammerings corresponding to the roller circumference stroke; the test method of the present application accurately and completely records the number of power-offs of the hammering closed circuit through the data acquisition instrument 8, and stores it in the data acquisition instrument 8, which can not only ensure that the data will not be wrong, but also save a certain amount of manpower; the number of hammerings is counted by opening and closing the circuit. The circuit will be disconnected for a certain period of time, and the correct recording of the number of hammerings will not be affected by circuit connection problems. The penetration depth is recorded by the friction rotation of the fixed pulley and the drill rod. This method has a high accuracy rate and is unlikely to have abnormalities.

[0074] The test method of the present application forms a complete dynamic penetration test record by integrating the automatic recording of dynamic penetration depth and the automatic counting of hammer blows, which saves the energy of on-site recorders and avoids the possibility of errors or data falsification due to manual recording on site. It is low-cost, simple in principle, easy to operate, and highly accurate. Furthermore, after being stored as electronic data, it can be copied and pasted or directly imported when input into geotechnical engineering survey software, which improves the work efficiency of processing on-site survey data. At the same time, the stored dynamic penetration test data can be provided to project quality control personnel, project leaders, company quality departments, including relevant departments at all levels who conduct quality inspections of the project in the later stage for review and inspection, etc., and a certain quality control effect is also achieved.

[0075] Regarding the test method, in one embodiment, at any time, when the photoelectric transmitter 93 fails, the signal is fed back to the data acquisition instrument 8 through the signal line, and the data acquisition instrument 8 issues an alarm.

[0076] The photoelectric transmitter 93 is the basis for automatically recording the penetration depth. Once a fault occurs, it can promptly remind the exploration personnel to deal with the fault in time, thereby always ensuring the normal operation of the dynamic penetration test device.

[0077] Regarding the test method, in one embodiment, the data acquisition instrument 8 records the total number of hammer blows corresponding to each roller circumference stroke, and can store multiple total hammer blows corresponding to multiple roller circumference strokes respectively; the engineering properties of the soil are judged by the total number of hammer blows corresponding to a single roller circumference stroke, and the changes in the engineering properties of the soil are judged by the total number of hammer blows corresponding to multiple roller circumference strokes, which is also convenient for viewing at any time.

[0078] The data acquisition instrument 8 is provided with a reset key, and after completing an exploration, the historical data can be reset by the reset key. The data acquisition instrument 8 is provided with a reset key, and the reset key is used to reset the historical data. After completing an exploration, before the next exploration, the historical data can be reset by the reset key to prevent too much data from occupying the memory.

[0079] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. 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 an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0080] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0081] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A dynamic penetration test device, characterized in that: Include: An automatic hammer drop device (100) comprises a hammer drop rod (3) for guiding a heavy hammer (1) and a decoupling device (6) to slide up and down, wherein at least the surface of the hammer drop rod (3) is insulated; A stroke monitoring device (9) comprises two rollers (91) symmetrically clamped on both sides of a drill rod (4) of an automatic drop hammer device (100), wherein one of the rollers (91) has a through hole parallel to the axis, and a photoelectric transmitter (93) and a photoelectric receiver (94) are respectively arranged on both sides of the through hole; The data acquisition instrument (8) is respectively connected to the weight (1) and the unhooking device (6) through the electric wire (10) to form a hammering closed circuit; it is also respectively connected to the photoelectric transmitter (93) and the photoelectric receiver (94); when the weight (1) and the unhooking device (6) are separated, the hammering closed circuit is powered off, and the data acquisition instrument (8) counts the number of hammering once; when the hammering occurs multiple times and the drill rod (4) moves downward cumulatively to drive the roller (91) to rotate one circle, the photoelectric receiver (94) receives the optical signal of the photoelectric transmitter (93) again, and the data acquisition instrument (8) obtains the total number of hammering corresponding to the circumference of the roller.

2. A dynamic penetration test device as claimed in claim 1, characterized in that: The two rollers (91) are supported and installed via a drill rod holder (92), wherein the drill rod holder (92) comprises a horizontal plate (922) and two pairs of vertical support plates (921), wherein a hole for avoiding the drill rod (4) is arranged at the center of the horizontal plate (922), and each pair of vertical support plates (921) supports the central axis of a roller (91); The photoelectric transmitter (93) and the photoelectric receiver (94) are arranged on the top surfaces of a pair of vertical support plates (921).

3. A dynamic penetration test device as claimed in claim 1, characterized in that: The data acquisition instrument (8) is used to record a plurality of total hammer blow numbers corresponding to a plurality of roller circumference strokes respectively; the data acquisition instrument (8) is provided with a reset key, and the reset key is used to reset historical data.

4. A dynamic penetration test device as claimed in claim 1, characterized in that: The circumference of the roller is designed to be 10 cm, and the diameter of the roller (91) is 3.1831 cm.

5. A dynamic penetration test device as claimed in claim 1, characterized in that: The drop hammer rod (3) is made of an insulating material or the insulating material is sprayed on its surface.

6. A dynamic penetration test device as claimed in claim 2, characterized in that: The travel monitoring device further comprises a level meter (95), and the level meter (95) is arranged on the top surface of the horizontal plate (922).

7. A dynamic penetration test device as claimed in claim 2, characterized in that: The horizontal plate (922) is horizontally fixed on a support frame, and the bottom end of the support frame is fixed on the land to be measured; The unhooking device (6) is connected to an upper steel wire rope (7), and the steel wire rope (7) is lifted by a drilling rig power device to drive the unhooking device (6) to move upward. When a certain height is reached, the unhooking device (6) is automatically separated from the heavy hammer (1).

8. A test method based on the dynamic penetration test device according to claim 1, characterized in that: Contains steps: In the initial state, the weight (1) rises to a certain height, and the photoelectric receiver (94) can receive the light signal of the photoelectric transmitter (93); The unhooking device (6) is separated from the heavy hammer (1), the hammering closed circuit is disconnected, and the data acquisition instrument (8) counts the number of hammering once; The heavy hammer (1) falls and strikes, and the probe (5) of the automatic hammer drop device (100) moves downward; at the same time, the drill rod (4) drives the roller (91) to rotate, and the photoelectric receiver (94) cannot receive the optical signal of the photoelectric transmitter (93); The hammering is repeated for multiple times until the roller (91) rotates one circle and the photoelectric receiver (94) receives the light signal from the photoelectric transmitter (93) again; the data acquisition instrument (8) obtains the total number of hammerings corresponding to the circumference of the roller.

9. The test method according to claim 8, characterized in that: At any time, when the photoelectric transmitter (93) fails, the data acquisition instrument (8) issues an alarm.

10. The test method according to claim 8, characterized in that: The data acquisition device (8) records the total number of hammer blows corresponding to each roller circumference stroke, and can store a plurality of total number of hammer blows corresponding to a plurality of roller circumference strokes respectively; The data acquisition instrument (8) is provided with a reset button, and after completing an exploration work, the historical data can be reset by the reset button.

Images