A soft soil bearing capacity testing device

Abstract

The application discloses a soft soil bearing capacity testing device, which comprises a main body, the main body comprises a hydraulic driving lifting seat, a driving mechanism is arranged on the lifting seat, a coring drill rod is arranged in the main body, a first positioning groove is arranged in the coring drill rod, a bottom-opened piston barrel is arranged at the top of the coring barrel, a piston is slidably arranged in the piston barrel, the piston is connected with a piston rod, the piston rod penetrates through the top of the piston barrel and is connected with a first positioning mechanism, an overflow valve is arranged on the piston barrel, an extension pipe is arranged on the side of the piston barrel, a detection pipe is movably sleeved on the extension pipe, the end of the detection pipe is sealed by an elastic layer, a displacement sensor and a pressure sensor are fixed in the detection pipe by a support, the detection end of the displacement sensor is connected with the elastic layer, an air / gas inlet pipe is arranged above the detection pipe and communicates with the piston barrel, a one-way valve is arranged on the air / gas inlet pipe, and a first through hole is arranged on the side of the coring drill rod.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of geotechnical engineering equipment, and particularly relates to a soft soil bearing capacity testing device. BACKGROUND

[0002] In modern construction engineering, geotechnical engineering investigation is a very important link, which can help engineers understand the underground soil structure and geological conditions, so as to take corresponding measures in the process of building design and construction, and ensure the stability and safety of the project.

[0003] In geological research, in order to understand the underground soil structure and geological conditions, the relationship between the bearing capacity and displacement of the drill hole sidewall is an important way to estimate the soil bearing capacity, which is generally realized by a specific detection device in the prior art, and needs to be detected separately after the completion of drilling, so the detection efficiency is low. SUMMARY

[0004] The application provides a soft soil bearing capacity testing device, which can measure the relationship between the bearing capacity and displacement of the sidewall of the drilled hole while coring, so as to obtain the strain relationship curve of the lateral expansion length and pressure or stress of the drill hole, and estimate the stratum bearing capacity for subsequent construction, without the need of a separate detection device for detection, so the detection efficiency is high.

[0005] In order to solve the above technical problems, the present application is solved by the following technical scheme: a soft soil bearing capacity testing device, comprising a main body, the main body comprises a hydraulic drive lifting seat, the lifting seat is provided with a drive mechanism, the output shaft of the drive mechanism is provided with a drill rod connector, the drill rod connector is detachably connected with a coring drill rod, the coring drill rod is provided with a coring barrel, the top of the coring barrel is provided with a first positioning mechanism, the coring drill rod is provided with a first positioning groove matched with the first positioning mechanism, the top of the coring barrel is provided with a bottom opening piston barrel, the piston barrel is slidably provided with a piston, the piston is connected with a piston rod, the piston rod penetrates out of the top of the piston barrel and is connected with the first positioning mechanism, the piston barrel is provided with an overflow valve, the side of the piston barrel is provided with an extension pipe, the extension pipe is sealingly and movably provided with a detection pipe, the end of the detection pipe is sealed by an elastic layer, the displacement sensor and the pressure sensor are fixed in the detection pipe by a support, the detection end of the displacement sensor is connected with the elastic layer, the top of the detection pipe is provided with an air / liquid inlet pipe communicated with the piston barrel, the air / liquid inlet pipe is provided with a one-way valve, the side of the coring drill rod is provided with a first through hole for the detection pipe to pass out. When the coring barrel reaches the bottom of the coring drill rod, the piston descends to the bottom of the piston barrel, the first positioning mechanism is positioned with the first positioning groove, the second positioning mechanism is positioned with the second positioning groove, after the coring is completed, the lifting head is engaged with the first positioning mechanism, the first positioning mechanism is separated from the first positioning groove, then the winch winds the cable to lift the first positioning mechanism, in the lifting process, under the action of the gravity of the coring barrel, the piston moves upward relative to the piston barrel at this time, in the upward movement process, the liquid or gas in the piston barrel is squeezed out from the overflow valve, the internal pressure of the piston barrel increases, the detection pipe is pushed out, the detection pipe passes out of the first through hole and abuts against the sidewall of the drill hole, as the pressure in the piston barrel increases, the elastic layer gradually deforms and pushes against the sidewall of the drill hole, the displacement sensor and the pressure sensor continuously measure the displacement and the pressure, so as to obtain the relationship between the bearing capacity of the sidewall of the drill hole and the displacement, when the piston moves upward beyond the extension pipe, the piston barrel changes the pressure on the detection pipe from positive pressure to negative pressure, the detection pipe is sucked back to the innermost position, until the piston reaches the top of the piston barrel, the winch continues to provide tension, the second positioning mechanism is separated from the second positioning groove, and the coring barrel is lifted to the ground. When the coring barrel is played back, because the first positioning mechanism will make the piston descend in the piston barrel due to gravity when the coring barrel is placed at the bottom of the coring drill rod, the gas or liquid is sucked in through the air / liquid inlet pipe until it is lowered to the lowest position, the first positioning mechanism is positioned with the first positioning groove. Through the above structure, the relationship between the bearing capacity of the sidewall of the drilled hole and the displacement can be measured while coring, so as to obtain the strain relationship curve of the lateral expansion length of the drill hole and the pressure or stress, which is used to estimate the bearing capacity of the stratum for subsequent construction.

[0006] In the technical scheme, preferably, the coring barrel is provided with a second positioning mechanism, and the coring drill rod is provided with a second positioning groove matched with the second positioning mechanism.

[0007] In the technical scheme, preferably, the piston barrel is axially provided with a plurality of overflow valves, and the overflow pressures of the plurality of overflow valves gradually increase from bottom to top.

[0008] In the technical scheme, preferably, the bottom opening side of the piston barrel is provided with a first filter screen, and the end of the air / liquid pipe is provided with a second filter screen. The first filter screen and the second filter screen are both used to prevent sundries from entering the piston barrel.

[0009] In the technical scheme, preferably, the first positioning mechanism comprises a top opening connecting cylinder, two rotating blocks are rotationally arranged in the connecting cylinder, a torsion spring is arranged between the two rotating blocks and a rotating shaft, a strip-shaped opening is arranged on the opposite side of the connecting cylinder, a limiting block is extended out of the strip-shaped opening from the two rotating blocks under the torsion of the torsion spring, and a limiting hook matched with a lifting head is arranged on the top of the rotating block.

[0010] In the technical scheme, preferably, the second positioning mechanism comprises a guide shaft arranged in the coring barrel in a radial direction, coaxial second through holes are arranged in the sidewall of the coring barrel at both ends of the guide shaft, limiting heads are movably arranged at both ends of the guide shaft, the limiting heads are extended out of the second through holes and have a taper at the outer end, a spring is arranged between the two limiting heads, and first limiting rings are arranged at the inner end of the coring barrel on both the limiting heads. The second positioning mechanism is convenient to install and simple in structure, and when the coring barrel is lifted, the limiting heads can be directly separated from the second limiting groove through the pulling force of the cable without the need of an additional operating mechanism.

[0011] In the technical scheme, preferably, a sliding sealing plug is arranged in the extension pipe, and a second limiting ring for limiting the sliding sealing plug is arranged at one end of the extension pipe close to the piston barrel. The structure can prevent sundries such as mud from entering the space surrounded by the extension pipe, the sliding sealing plug and the detection pipe, so as to avoid affecting the detection of the pressure sensor and the displacement sensor.

[0012] In the above technical solution, preferably, the main body is provided with an annular positioning seat coaxial with the drill rod connector, a rotating ring is rotatably connected to the bottom of the annular positioning seat, a swing arm is rotatably arranged on the rotating ring, a wave-shaped matching surface is arranged around the annular positioning seat, the top end of the swing arm abuts against the wave-shaped matching surface, a hammer head is arranged at the other end of the swing arm, a return spring is arranged on the rotating ring to push the top end of the swing arm towards the wave-shaped matching surface, a driving disc is arranged on the drill rod connector, a driving rod is movably arranged on the driving disc, a matching groove is arranged on the rotating ring for the driving rod to pass through, and the driving mechanism drives the rotating ring to rotate so that the hammer head hammers the coring drill rod. This coring device normally takes cores when coring. After the drill rod connector is separated from the coring drill rod, the driving rod can be inserted on the driving disc and passed through the matching groove, and then the driving mechanism drives the driving disc to rotate, which drives the rotating ring to rotate in the process of rotating the driving disc. The rotating ring drives the swing arm to rotate when rotating, and the swing arm rotates and the top of the swing arm abuts against the wave-shaped matching surface, which makes the swing arm rotate. The swing arm rotates around the coring drill rod while swinging back and forth around the rotating connection of the rotating ring. The hammer head can hammer the coring drill rod inserted into the ground from various angles, and the vibration is transmitted from the coring drill rod to the drill hole, so that the drill hole is expanded to a certain extent, thereby reducing the soil adhesion and rock friction around the drill hole, effectively reducing the driving force required when the coring drill rod is drilled, and reducing the problem of the coring drill rod being stuck and unable to rotate.

[0013] Compared with the prior art, the present application has the following beneficial effects: when the coring barrel reaches the bottom of the coring drill rod, the piston descends to the bottom of the piston barrel, the first positioning mechanism is positioned in cooperation with the first positioning groove, the second positioning mechanism is positioned in cooperation with the second positioning groove, after the coring is completed, the lifting head is engaged with the first positioning mechanism, the first positioning mechanism is disengaged from the first positioning groove, then the winch winds the cable to lift the first positioning mechanism, during the lifting process, the piston moves upward relative to the piston barrel due to the cooperation between the second positioning mechanism and the second positioning groove and the gravity of the coring barrel, during the upward movement, the liquid or gas in the piston barrel is squeezed out from the overflow valve, the pressure in the piston barrel increases, the detection tube is pushed out, the detection tube penetrates through the first through hole and abuts against the sidewall of the borehole, as the pressure in the piston barrel increases, the elastic layer is gradually deformed to push against the sidewall of the borehole, the displacement sensor and the pressure sensor continuously measure the displacement and the pressure, so that the relationship between the bearing capacity of the sidewall of the borehole and the displacement is obtained, when the piston moves upward beyond the extension tube, the piston barrel changes the pressure on the detection tube from positive pressure to negative pressure, the detection tube is sucked back to the innermost position, until the piston reaches the top of the piston barrel, the winch continues to provide tension, the second positioning mechanism is disengaged from the second positioning groove, and the coring barrel is lifted to the ground. When the coring barrel is played back, the piston in the piston barrel descends due to the gravity of the first positioning mechanism when the coring barrel is placed at the bottom of the coring drill rod, the gas or liquid is sucked through the gas / liquid inlet pipe, until the first positioning mechanism is positioned in cooperation with the first positioning groove. Through the above structure, the relationship between the bearing capacity of the sidewall of the drilled hole and the displacement can be measured during coring, so that the strain relationship curve between the lateral expansion length of the drilled hole and the pressure or stress is obtained, which is used to estimate the bearing capacity of the stratum for subsequent construction. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a structure schematic view of the coring barrel in the embodiment of the present application when the coring barrel is located at the bottom of the coring drill rod.

[0015] Figure 2 It is a partial structure schematic view of the coring barrel in the embodiment of the present application in the lifting state.

[0016] Figure 3 It is a partial sectional view of Figure 1 .

[0017] Figure 4 It is a partial sectional view of Figure 2 .

[0018] Figure 5 It is an enlarged view of A in Figure 4 .

[0019] Figure 6 It is a whole structure schematic view of the embodiment of the present application.

[0020] Figure 7Fig. 4 is a schematic diagram of an exploded view of the ring-shaped positioning seat in an embodiment of the present application.

[0021] Figure 8 Fig. 5 is a schematic diagram of a sectional view of the connection between the rotating ring and the swing arm in an embodiment of the present application. Embodiment

[0022] The present application will be further described below in conjunction with the drawings and specific embodiments. Referring to Fig. 1, a schematic diagram of a swing arm in an embodiment of the present application is shown. The swing arm 1 is connected to a rotating ring 2. The swing arm 1 is connected to the rotating ring 2 through a connecting rod 3. The swing arm 1 is connected to the connecting rod 3 through a first connecting hole 4. The connecting rod 3 is connected to the rotating ring 2 through a second connecting hole 5. Figures 1 to 8The utility model provides a kind of soft soil bearing capacity testing device, including main body 1, main body 1 includes hydraulic drive lifting seat 2 and coring crane, coring crane includes winch, several guide wheels, cable and lifting head 9;Lifting seat 2 is provided with driving mechanism 3, driving mechanism 3 is hydraulic motor, driving mechanism 3 is provided with drill rod connector 31 on output shaft, drill rod connector 31 is detachably connected with coring drill pipe 10, coring drill pipe 10 is provided with coring bucket 5, coring bucket 5 top is provided with the bottom opening piston barrel 6, piston barrel 6 is slidably provided with piston 61, piston 61 is connected with piston rod 62, piston rod 62 is connected from piston barrel 6 top and exits first positioning mechanism 7, coring drill pipe 10 is provided with the first positioning groove matched with first positioning mechanism 7, piston barrel 6 is provided with overflow valve 63, piston barrel 6 side is provided with extension pipe 64, extension pipe 64 is sealingly movably provided with detection tube 65, detection tube 65 end is sealed by elastic layer 66, displacement sensor 67 and pressure sensor 68 are fixed in detection tube 65 by support, the detection end of displacement sensor 67 is connected elastic layer 66, detection tube 65 top is equipped with the air / liquid inlet pipe 69 that communicates with piston barrel 6, air / liquid inlet pipe 69 is equipped with one-way valve 610, coring drill pipe 10 side is equipped with the first through hole 101 that detection tube 65 passes out.In the coring bucket 5 to coring drill pipe 10 bottom, piston 61 drops to the bottom of piston barrel 6, first positioning mechanism 7 is positioned with the first positioning groove, second positioning mechanism 8 is positioned with the second positioning groove, after coring is completed, lifting head 9 is engaged with first positioning mechanism 7, first positioning mechanism 7 is separated from first positioning groove, then winch winding cable lifts first positioning mechanism 7, during lifting, due to the gravity of coring bucket 5, piston 61 is moved upward relative to piston barrel 6, during moving upward, liquid or gas in piston barrel 6 is extruded from overflow valve 63, the internal pressure of piston barrel 6 increases, detection tube 65 is pushed out, detection tube 65 passes out first through hole 101 and abuts on the sidewall of drill hole, as the pressure in piston barrel 6 increases, elastic layer 66 is gradually deformed and pushes to the sidewall of drill hole, displacement sensor 67 and pressure sensor 68 constantly measure displacement and pressure, so as to obtain the relationship between the bearing capacity of the sidewall of drill hole and displacement, when piston 61 continues to move upward and passes extension pipe, the pressure of piston barrel 6 to detection tube 65 changes from positive pressure to negative pressure, detection tube 65 is absorbed to the innermost position, until piston 61 reaches the top of piston barrel 6, winch continues to provide tension, second positioning mechanism 8 is separated from second positioning groove, and coring bucket 5 is lifted to ground.In the playback of coring bucket 5, due to the gravity of first positioning mechanism 7, piston 61 drops in piston barrel 6 when coring bucket 5 is placed to the bottom of coring drill pipe 10, gas or liquid is absorbed through air / liquid inlet pipe 69 until it drops to the lowest point, first positioning mechanism 7 is positioned with first positioning groove.Through the above structure, the relationship between the lateral wall of the drilled hole and the bearing capacity and displacement can be measured during coring, so as to obtain the strain relationship curve of the lateral expansion length of the drilled hole and the pressure or stress, and to provide the bearing capacity of the stratum for subsequent construction.

[0023] In the embodiment, the second positioning mechanism 8 is arranged on the coring barrel 5, and the second positioning groove matched with the second positioning mechanism 8 is arranged in the coring drill rod 10. The second positioning mechanism 8 can be clamped into the second positioning groove for positioning when the piston 61 moves upward relative to the piston barrel 6 during the coring process, so as to ensure that the piston 61 can extrude a large enough pressure in the piston barrel 6 for the detection of the lateral pressure.

[0024] In the embodiment, the overflow valves 63 are axially distributed on the piston barrel 6, and the overflow pressure of the overflow valves 63 gradually increases from bottom to top. The pressure in the piston barrel 6 can gradually rise during the upward movement of the piston 61, so as to obtain the relationship between the bearing capacity and the displacement and the strain relationship curve of the lateral expansion length of the drilled hole and the pressure or stress.

[0025] In the embodiment, the first filter screen 611 is arranged on the bottom opening side of the piston barrel 6, and the second filter screen 612 is arranged on the end of the air / liquid pipe 69. The first filter screen 611 and the second filter screen 612 are both used to prevent sundries from entering the piston barrel 6.

[0026] In the embodiment, the first positioning mechanism 7 includes the open-top connecting cylinder 71, the two rotating blocks 72 are rotatably arranged in the connecting cylinder 71, the torsional spring is arranged between the two rotating blocks 72 and the rotating shaft, the opposite sides of the connecting cylinder 71 are provided with the strip-shaped openings 73, the two rotating blocks 72 extend out the limiting blocks 74 from the strip-shaped openings 73 under the torsional force of the torsional spring, and the top of the rotating block 72 is provided with the limiting hook 75 matched with the hanger head 9.

[0027] In the embodiment, the second positioning mechanism 8 includes the guide shaft 81 radially arranged in the coring barrel 5, the coaxial second through holes 51 are arranged on the side walls of the coring barrel 5 at both ends of the guide shaft 81, the limiting heads 82 are movably sleeved on both ends of the guide shaft 81, the limiting heads 82 extend out of the second through holes 51 and have a taper at the outer ends, the spring 83 is arranged between the two limiting heads 82, and the first limiting rings 84 are arranged on the inner ends of the two limiting heads 82 located in the coring barrel 5. The second positioning mechanism 8 is convenient to install and simple in structure, and the limiting heads 82 can be directly separated from the second limiting groove through the pulling force of the cable when the coring barrel 5 is lifted, without the need for an additional operating mechanism.

[0028] In this embodiment, the extension pipe 64 is provided with a sliding sealing plug 613, and the end of the extension pipe 64 close to the piston barrel 6 is provided with a second limiting ring 614 for limiting the sliding of the sliding sealing plug 613. The sliding sealing plug 613 is arranged to move in the extension pipe 64 when subjected to positive pressure and negative pressure, while conducting the pressure, and by the blocking of the sliding sealing plug 613, the impurities such as mud can be prevented from entering the space surrounded by the extension pipe 64, the sliding sealing plug 613 and the detection pipe 65, so as to avoid affecting the detection of the pressure sensor 68 and the displacement sensor 67.

[0029] The main body 1 is provided with an annular positioning seat 4 coaxial with the drill rod connector 31, the annular positioning seat 4 is rotationally connected with a rotating ring 41 at the bottom, the rotating ring 41 is rotationally provided with a swing arm 42, the annular positioning seat 4 is provided with a wave-shaped matching surface 43, the swing arm 42 top end abuts against the wave-shaped matching surface 43, the swing arm 42 is provided with a hammer head 44 at the other end, the rotating ring 41 is provided with a reset spring 45 for pushing the swing arm 42 top end towards the wave-shaped matching surface 43, the drill rod connector 31 is provided with a driving disc 32, the driving disc 32 is movably provided with a driving rod 46, the rotating ring 41 is provided with a matching groove 461 for the driving rod 46 to pass through, the driving mechanism 3 drives the rotating ring 41 to rotate to make the hammer head 44 hammer the core drill rod 10. When taking the core, under the rotation of the driving mechanism 3 and the pressing of the lifting seat 2, the core drill rod 10 drills into the ground together with the core barrel 5 to take the core, when the core barrel 5 is filled, the drill rod connector 31 is separated from the core drill rod 10, the winch releases the cable, the lifting head 9 is put into the core drill rod 10, under the gravity of the lifting head 9, the lifting head 9 moves downwards along the core drill rod 10 and cooperates with the core barrel 5, then under the traction of the winch, the core barrel 5 is pulled out of the ground, the soil or rock in the core barrel 5 is poured out, then the core taking operation is completed, then the core barrel 5 can be hoisted back into the core drill rod 10, the positioning mechanism and the positioning groove in the core drill rod 10 automatically complete the positioning, then the core drill rod 10 is spliced, after the length of the spliced core drill rod 10 is increased, the drill rod connector 31 is connected with the top of the spliced core drill rod 10, then the drilling and core taking continue. In the core taking process, after the drill rod connector 31 is separated from the core drill rod 10, the driving rod 46 can be inserted into the driving disc 32, the driving rod 46 passes through the matching groove 461, then the driving mechanism 3 drives the driving disc 32 to rotate, in the process of the driving disc 32 rotating, the rotating ring 41 is driven to rotate, the rotating ring 41 drives the swing arm 42 to rotate, the swing arm 42 is provided with a ball head at the top, the ball head top abuts against the wave-shaped matching surface 43, then the swing arm 42 rotates, the swing arm 42 rotates around the core drill rod 10 as a whole, and swings back and forth around the rotating connection of the rotating ring, the hammer head can hammer the core drill rod 10 inserted into the ground from various angles, the vibration is transmitted from the core drill rod 10 to the drill hole, the drill hole is expanded to a certain extent, so that the soil adhesion and rock friction around the drill hole are reduced, the driving force required when the core drill rod 10 drills down is effectively reduced, and the problem that the core drill rod 10 is stuck and cannot rotate is reduced.

[0030] In the embodiment, the main body 1 is provided with a linear driving cylinder 47, the linear driving cylinder 47 can be selected from a hydraulic cylinder, an air cylinder or an electric cylinder, the output end of the linear driving cylinder 47 is connected with the annular positioning seat 4, the linear driving cylinder 47 drives the annular positioning seat 4 to ascend and descend to change the hammering height. The structure can adjust the height of the annular positioning seat 4 to change the hammering position according to the height of the core drill rod 10 or according to the needs.

[0031] In this embodiment, the rotating ring 41 is connected with the annular positioning seat 4 through a bearing. This structure is used to reduce the friction between the rotating ring 41 and the annular positioning seat 4.

[0032] In this embodiment, the rotating ring 41 is spliced by two half rings 411, and the outer wall of each half ring 411 is provided with a bolt hole 412, and a bent bolt 413 is arranged between the bolt holes 412. This structure facilitates the installation of the rotating ring 41 on the annular positioning seat 4.

[0033] In this embodiment, a matching groove 461 is formed in the inner circle of the spliced part of the two half rings 411.

[0034] The above is only the preferred embodiment of the present application, and it should be pointed out that for ordinary skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, and these improvements and refinements should be considered as the protection scope of the present application.

Claims

1. A soft soil bearing capacity testing device, comprising a main body (1), the main body (1) comprising a hydraulically driven lifting seat (2), a driving mechanism (3) provided on the lifting seat (2), a drill rod connector (31) provided on the output shaft of the driving mechanism (3), a core drill rod (10) detachably connected to the drill rod connector (31), a core barrel (5) provided inside the core drill rod (10), a first positioning mechanism (7) provided above the core barrel (5), and a first positioning groove matching the first positioning mechanism (7) provided inside the core drill rod (10), characterized in that: The core-taking barrel (5) is provided with a piston barrel (6) with a bottom opening at the top. A piston (61) is slidably disposed inside the piston barrel (6). The piston (61) is connected to a piston rod (62). The piston rod (62) extends from the top of the piston barrel (6) and connects to the first positioning mechanism (7). An overflow valve (63) is provided on the piston barrel (6). An extension tube (64) is provided on the side of the piston barrel (6). A detection tube (65) is movably and sealingly fitted on the extension tube (64). The detection tube (65) The end of the detection tube (65) is sealed by an elastic layer (66). A displacement sensor (67) and a pressure sensor (68) are fixed inside the detection tube (65) by a bracket. The detection end of the displacement sensor (67) is connected to the elastic layer (66). An air / liquid inlet pipe (69) communicating with the piston barrel (6) is provided above the detection tube (65). A one-way valve (610) is provided on the air / liquid inlet pipe (69). A first through hole (101) is provided on the side of the core drill rod (10) for the detection tube (65) to pass through.

2. The soft soil bearing capacity testing device as described in claim 1, characterized in that: The core barrel (5) is provided with a second positioning mechanism (8), and the core drill rod (10) is provided with a second positioning groove that matches the second positioning mechanism (8).

3. The soft soil bearing capacity testing device as described in claim 1, characterized in that: The piston barrel (6) has several overflow valves (63) axially distributed on it, and the overflow pressure of the several overflow valves (63) gradually increases from bottom to top.

4. The soft soil bearing capacity testing device as described in claim 1, characterized in that: The piston barrel (6) has a first filter screen (611) at the bottom opening side, and the air / liquid pipe (69) has a second filter screen (612) at the end.

5. The soft soil bearing capacity testing device as described in claim 1, characterized in that: The first positioning mechanism (7) includes a connecting cylinder (71) with a top opening. Two rotating blocks (72) are rotatably arranged inside the connecting cylinder (71). A torsion spring is provided between the two rotating blocks (72) and the rotating shaft. A strip-shaped opening (73) is provided on the opposite side of the connecting cylinder (71). Under the torsion of the torsion spring, the two rotating blocks (72) extend from the strip-shaped opening (73) to form a limiting block (74). A limiting hook (75) that cooperates with the lifting head (9) is provided on the top of the rotating block (72).

6. The soft soil bearing capacity testing device as described in claim 2, characterized in that: The second positioning mechanism (8) includes a guide shaft (81) radially disposed inside the core barrel (5). The core barrel (5) sidewalls at both ends of the guide shaft (81) are provided with coaxial second through holes (51). Limiting heads (82) are movably sleeved at both ends of the guide shaft (81). The outer end of the limiting head (82) extends out of the second through hole (51) and has a taper. A spring (83) is disposed between the two limiting heads (82). A first limiting ring (84) is disposed at the inner end of the two limiting heads (82) located in the core barrel (5).

7. The soft soil bearing capacity testing device as described in claim 1, characterized in that: The extension tube (64) is provided with a sliding sealing plug (613), and a second limiting ring (614) for limiting the sliding sealing plug (613) is provided at one end of the extension tube (64) near the piston barrel (6).

8. The soft soil bearing capacity testing device as described in claim 1, characterized in that: The main body (1) is provided with an annular positioning seat (4) coaxial with the drill pipe connector (31). A rotating ring (41) is rotatably connected to the bottom of the annular positioning seat (4). A swing arm (42) is rotatably mounted on the rotating ring (41). A wavy mating surface (43) is wound around the annular positioning seat (4). The top end of the swing arm (42) abuts against the wavy mating surface (43). A hammer head (44) is provided at the other end of the swing arm (42). The rotating ring (41) A return spring (45) is provided on the upper part to push the top of the swing arm (42) toward the wave-shaped mating surface (43). A drive disk (32) is provided on the drill rod connector (31). A drive rod (46) is movably passed through the drive disk (32). A mating groove (461) is provided on the rotating ring (41) for the drive rod (46) to pass through. The drive mechanism (3) drives the rotating ring (41) to rotate so that the hammer (44) hammers the core drill rod (10).

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