Rock-soil standard penetration test device

Abstract

The utility model relates to the technical field of rock-soil standard penetration tests, in particular to a rock-soil standard penetration test device, which comprises an enclosure part, a piercing hammer and a hammer pad, a stroke cavity is formed in the enclosure part in the first direction in a penetrating mode, and the center penetrating hammer is movably arranged in the stroke cavity. The hammer pad is arranged at one end of the stroke cavity; the piercing hammer is placed in the stroke cavity of the enclosure part, and the hammer pad is located at one end of the stroke cavity, so that the piercing hammer can be surrounded by the enclosure part and cannot be exposed to the outside in the process that the piercing hammer falls onto the hammer pad, and potential safety hazards in the process that the piercing hammer falls onto the hammer pad are eliminated.

Description

Technical Field

[0001] The utility model relates to the technical field of geotechnical standard penetration tests, and more specifically, to a geotechnical standard penetration test device. Background Art

[0002] Geotechnical engineering investigation is an important task at the initial stage of engineering construction. Drilling equipment is used to identify the strata. At the same time, standard penetration tests are carried out on each undisturbed rock and soil layer. The test results are used to judge the density of each rock and soil layer, so as to determine the allowable bearing capacity of the foundation soil; evaluate the single-pile bearing capacity of rock and soil, etc. According to the "Code for Geotechnical Engineering Investigation", the drill is used to drill to the predetermined depth, the residual soil in the hole is removed, and then the standard penetration sampler is tightly connected and lowered to the bottom of the borehole, keeping the verticality of the standard penetration sampler, drill pipe and standard penetration guide rod; finally, record the number of hammer blows N required for each 30 cm of penetration. According to the interval where the value of the number of hammer blows N is located, the density of the rock and soil layer can be judged.

[0003] The existing standard penetration test device consists of two parts. One is the penetrator that contacts the rock and soil mass at the bottom of the borehole, and the other is the hammering device connected to the drill pipe exposed on the ground. The hammering device mainly includes a guide rod, a drop hammer and a hammer pad. During use, the drop hammer is lifted 76 cm on the guide rod and then released. The drop hammer makes a free fall motion and hits the hammer pad. The hammer pad is arranged at the top of the drill pipe. At this time, the hammer pad transmits the hammering force into the penetrator, that is, one hammer blow is completed. Repeat the above process until the penetration head penetrates 30 cm into the rock and soil, and then the number of hammer blows N at this time can be counted.

[0004] During the process of the existing drop hammer and guide rod being used in cooperation, the action of the drop hammer hitting the hammer pad is always exposed to the outside, without a safety protection device. Repeatedly lifting and releasing the drop hammer has great potential safety hazards. Summary of the Utility Model

[0005] The utility model aims to overcome the problem of potential safety hazards during the release process of the drop hammer due to the exposure of the drop hammer to the outside in the above-mentioned existing technology, and provides a geotechnical standard penetration test device.

[0006] To solve the above technical problems, the technical solution adopted by the utility model is: a geotechnical standard penetration test device, including an enclosure, a drop hammer and a hammer pad; a travel cavity is axially penetrated through the enclosure in a first direction, and the drop hammer is movably arranged in the travel cavity; the hammer pad is arranged at one end of the travel cavity; a grasping mechanism for grasping or releasing the drop hammer is arranged in the enclosure; wherein, the axis of the travel cavity (5) is the first direction.

[0007] Furthermore, the grasping mechanism includes a scaling component and a bayonet for clamping the drop hammer; the scaling component controls the size of the bayonet to grasp or release the drop hammer.

[0008] Furthermore, the gripping mechanism includes a plurality of jaws; one end of the jaw is a gripping portion, and the other end is a releasing portion; there is a gap between the gripping portions of the plurality of jaws to form a bayonet; the zoom assembly includes a folding assembly for closing the plurality of gripping portions and an expansion assembly for closing the releasing portion.

[0009] Furthermore, the clamping jaw also includes a guide portion, a guide groove extending along the first direction is provided in the travel cavity, and the guide portion is movably disposed in the guide groove.

[0010] Furthermore, the folding assembly includes a plurality of elastic members; one end of the elastic member is connected to the grasping portion of one clamping jaw, and the other end of the elastic member is connected to the grasping portion of another clamping jaw.

[0011] Furthermore, the expansion assembly includes a clamping block, an abutment block, and an expansion piece; the clamping block is arranged on the core-piercing hammer, the clamping block includes a protruding portion and a clamping portion, the clamping portion is located on the side of the protruding portion facing the hammer pad, the envelope diameter of the projection of the protruding portion along the first direction is smaller than the envelope diameter of the projection of the clamping portion along the first direction, and the clamping block and the clamping port are located in the same straight line; the abutment block is arranged on the grasping portion, and the abutment block extends toward the center of the clamping port; the expansion piece is arranged at one end of the stroke chamber away from the hammer pad.

[0012] Furthermore, when the plurality of clamping jaws come into contact with the expansion member, the expansion member closes the release portions of the plurality of clamping jaws.

[0013] Furthermore, the expansion piece is provided with a closing groove matched with the shape of the release portion; the closing groove is centered in the first direction and is arranged to diverge obliquely toward the hammer pad.

[0014] Furthermore, the grabbing mechanism also includes a connecting block, and a plurality of clamping claws are hinged to the connecting block; the grabbing portion is located on a side of the hinge point facing the hammer pad, and the releasing portion is located on a side of the hinge point away from the hammer pad.

[0015] Furthermore, it also includes a lifting member, which is connected to the core-piercing hammer, and one end of the lifting member away from the core-piercing hammer is always located outside the stroke chamber.

[0016] Compared with the prior art, the beneficial effects of the utility model are:

[0017] By placing the core hammer in the stroke cavity of the enclosure and the hammer pad at one end of the stroke cavity, the core hammer will be surrounded by the enclosure and will not be exposed to the outside world when it falls to the hammer pad, thereby eliminating the safety hazard in the process of the core hammer falling to the hammer pad. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of an embodiment of a rock and soil standard penetration test device of the utility model;

[0019] Figure 2It is a schematic structural diagram of the enclosing member in an embodiment of a geotechnical standard penetration test device of the present utility model;

[0020] Figure 3 It is a schematic structural diagram of the grasping mechanism in an embodiment of a geotechnical standard penetration test device of the present utility model;

[0021] Figure 4 It is a schematic structural diagram of the expanding member in an embodiment of a geotechnical standard penetration test device of the present utility model;

[0022] Figure 5 It is a schematic structural diagram of the grasping mechanism when releasing the core hammer in an embodiment of a geotechnical standard penetration test device of the present utility model;

[0023] Figure 6 It is a schematic structural diagram showing the connection relationship between the lifting member and the connecting block in an embodiment of a geotechnical standard penetration test device of the present utility model.

[0024] In the drawings: 1. Enclosing member; 2. Core hammer; 3. Hammer pad; 4. First direction; 5. Stroke cavity; 6. Bayonet; 8. Claw; 81. Grasping part; 82. Releasing part; 83. Guiding part; 9. Guiding groove; 10. Elastic member; 11. Support column; 12. Support plate; 13. Block; 131. Protruding part; 132. Clamping part; 14. Abutting block; 15. Expanding member; 16. Closing groove; 17. Connecting block; 18. Lifting member. Detailed implementation manners

[0025] The drawings are only for illustrative purposes and should not be construed as limitations on this patent; for better illustrating this embodiment, some components in the drawings are omitted, enlarged or reduced, and do not represent the dimensions of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted. The positional relationships described in the drawings are only for illustrative purposes and should not be construed as limitations on this patent.

[0026] In the drawings of the embodiments of the present utility model, the same or similar reference numerals correspond to the same or similar components; in the description of the present utility model, it should be understood that if there are terms such as "upper", "lower", "left", "right", "long", "short", etc. indicating the orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present utility model 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. Therefore, the terms describing the positional relationship in the drawings are only for illustrative purposes and should not be construed as limitations on this patent. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0027] The technical solution of the present utility model will be further specifically described below through specific embodiments in conjunction with the accompanying drawings:

[0028] Embodiment

[0029] Referring to Figure 1 and Figure 2 This is an embodiment of a geotechnical standard penetration test device of the present utility model. The geotechnical standard penetration test device includes an enclosure member 1, a drop hammer 2 and a cushion block 3; a travel cavity 5 is formed through the enclosure member 1 along a first direction 4, and the drop hammer 2 is movably arranged in the travel cavity 5; the cushion block 3 is arranged at one end of the travel cavity 5.

[0030] The first direction 4 is the travel direction of the drop hammer 2 when it strikes the cushion block 3, that is, the direction of the gravity received by the drop hammer 2. The shape of the enclosure member 1 can be arbitrary, as long as the enclosure member 1 can surround the travel cavity 5 to prevent the drop hammer 2 from being exposed to the outside during the falling process. For example, the enclosure member 1 can be in the shape of a cuboid, and the travel cavity 5 is formed through it along the first direction 4; the enclosure member 1 can also be in the shape of a sphere, pyramid, frustum or cylinder, etc. In this embodiment, it is preferably in the shape of a cylinder. In order to ensure the stability of the drop hammer 2 during the sliding process in the travel cavity 5, the cross-sectional shape of the travel cavity 5 is similar to the cross-sectional shape of the drop hammer 2, and the shape of the drop hammer 2 can be arbitrary, such as a frustum, cuboid, sphere, etc. In this embodiment, the shape of the drop hammer 2 is a cylinder, so the overall shape of the travel cavity 5 is also a cylinder. The axis of the travel cavity 5 is the first direction 4, and the travel cavity 5 is coaxial with the enclosure member 1. The shape of the cushion block 3 can be arbitrary, such as square, triangular, elliptical, etc., as long as the cushion block 3 can cover the cross-section of the travel cavity 5, so as to prevent the drop hammer 2 from being exposed through the gap between the cushion block 3 and the travel cavity 5. In this embodiment, the shape of the cushion block 3 is circular, and the cushion block 3 is coaxially arranged with the travel cavity 5. In order to prevent the cushion block 3 from separating from the enclosure member 1 during the process of the drop hammer 2 striking the cushion block 3, the cushion block 3 is fixedly connected to the enclosure member 1. In this embodiment, the cushion block 3 is coaxially welded to the bottom surface of the enclosure member 1. In order to facilitate the connection between the cushion block 3 and the penetrometer, a screw rod is welded to the bottom of the cushion block 3, so as to facilitate the installation of the penetrometer at the bottom of the cushion block 3 through threaded connection.

[0031] In this embodiment, a grasping mechanism for grasping or releasing the drop hammer 2 is provided inside the enclosure member 1.

[0032] In order to be able to conveniently grasp the drop hammer 2 that has fallen on the cushion block 3 for the next hammering process, a grasping mechanism is placed in the travel cavity 5. When the drop hammer 2 falls onto the cushion block 3 to complete a hammering process, the grasping mechanism can be used to grasp the drop hammer 2, and then the grasping mechanism together with the drop hammer 2 is lifted to the end of the travel cavity 5 far from the cushion block 3, and then the grasping mechanism is controlled to release the drop hammer 2 for the next hammering.

[0033] Reference Figure 3 In this embodiment, the grabbing mechanism includes a zoom component and a bayonet 6 for clamping the core hammer 2; the zoom component controls the size of the bayonet 6 to grab or release the core hammer 2.

[0034] When it is necessary to grab the core hammer 2, the size of the bayonet 6 is enlarged by the scaling assembly, and then the bayonet 6 is reduced so that the core hammer 2 can be clamped by the bayonet 6. Then the grabbing mechanism drives the core hammer 2 to move to the end of the stroke chamber 5 away from the hammer pad 3, and the size of the bayonet 6 is expanded again by the scaling assembly to release the core hammer 2.

[0035] Reference Figure 3 In this embodiment, the gripping mechanism includes a plurality of jaws 8; one end of the jaw 8 is a gripping portion 81, and the other end is a release portion 82; there is a gap between the gripping portions 81 of the plurality of jaws 8 to form a bayonet 6; the zoom assembly includes a folding assembly for closing the plurality of gripping portions 81 and an expansion assembly for closing and opening the release portion 82.

[0036] The number of the clamping jaws 8 can be more than two, for example, three, four or six, and the plurality of clamping jaws 8 are arranged around the first direction 4 with the first direction 4 as the axis. In the present embodiment, two clamping jaws 8 are preferably used, and the two clamping jaws 8 are symmetrically arranged with the first direction 4 as the axis. The end of the clamping jaw 8 facing the hammer pad 3 is the grasping portion 81, and the end of the clamping jaw 8 away from the hammer pad 3 is the releasing portion 82. The interval between the grasping portions 81 of the two clamping jaws 8 is the bayonet 6. The retracting component brings the grasping portions 81 of the clamping jaws 8 closer to each other, thereby reducing the size of the bayonet 6. The expanding component is used to bring the releasing portions 82 closer to each other, thereby moving the grasping portions 81 away from each other, thereby achieving the effect of increasing the size of the bayonet 6.

[0037] Reference Figure 2 and Figure 3 In this embodiment, the clamping jaw 8 further includes a guide portion 83 , a guide groove 9 extending along the first direction 4 is provided in the stroke cavity 5 , and the guide portion 83 is movably disposed in the guide groove 9 .

[0038] The guide portion 83 is located between the release portion 82 and the gripping portion 81. The guide portion 83 can be an additional component provided on the clamping jaw 8, or can be integrated with the clamping jaw 8. In this embodiment, the clamping jaw 8 is located between the release portion 82 and the gripping portion 81 and is raised to form the guide portion 83, so that the clamping jaw 8 is in an arc shape. The number of guide grooves 9 corresponds to the guide portion 83 one by one, so the number of guide portions 83 in this embodiment is two, and the thickness of the guide portion 83 is adapted to the width of the guide groove 9, so that the guide portion 83 can be just slidably embedded in the guide groove 9. By providing the guide portion 83 and the guide groove 9, the clamping jaw 8 can move stably in the stroke chamber 5, and will not shake during movement and cause the core hammer 2 to shake.

[0039] ReferenceFigure 3 In this embodiment, the folding assembly includes a plurality of elastic members 10 ; one end of the elastic member 10 is connected to the grasping portion 81 of one clamping jaw 8 , and the other end is connected to the grasping portion 81 of another clamping jaw 8 .

[0040] The elastic member 10 can be a spring, a rubber column, etc. In this embodiment, the elastic member 10 is preferably a spring. A support column 11 is welded on the side walls of the two clamping jaws 8 facing each other. The support column 11 is cylindrical, and a circular support plate 12 is coaxially welded on the end of the support column 11 away from the clamping jaws 8. The two ends of the elastic member 10 are respectively welded to the two support plates 12 on the two clamping jaws 8. The two clamping jaws 8 have a tendency to approach each other under the elastic force of the elastic member 10. By providing the support column 11 and the support plate 12, the force applied by the elastic member 10 is made more stable.

[0041] Reference Figure 3 In this embodiment, the expansion assembly includes a clamping block 13, an abutting block 14, and an expansion piece 15; the clamping block 13 is arranged on the core hammer 2, the clamping block 13 includes a protruding portion 131 and a clamping portion 132, the clamping portion 132 is located on the side of the protruding portion 131 facing the hammer pad 3, the envelope diameter of the projection of the protruding portion 131 along the first direction 4 is smaller than the envelope diameter of the projection of the clamping portion 132 along the first direction 4, and the clamping block 13 and the bayonet 6 are located in the same straight line; the abutting block 14 is arranged on the grasping portion 81, and the abutting block 14 extends toward the center of the bayonet 6; the expansion piece 15 is arranged at one end of the stroke chamber 5 away from the hammer pad 3, and when the multiple clamping jaws 8 contact the expansion piece 15, the expansion piece 15 closes the release portions 82 of the multiple clamping jaws 8.

[0042] The shape of the clamping block 13 can be arbitrary, such as pyramid-shaped, frustum-shaped or irregular shape, as long as the envelope diameter of the projection of the protruding part 131 along the first direction 4 is smaller than the envelope diameter of the projection of the clamping part 132 along the first direction 4; for example: if the clamping block 13 is pyramid-shaped, the pointed part of the pyramid of the clamping block 13 is the protruding part 131, and the bottom surface of the clamping block 13 is the clamping part 132; if the clamping block 13 is frustum-shaped, the upper bottom surface of the clamping block 13 is the protruding part 131, and the lower bottom surface of the clamping block 13 is the clamping part 132. In this embodiment, the clamping block 13 is frustum-shaped, and a heightening column is coaxially welded to the bottom surface of the clamping block 13. The heightening column is coaxially welded to the top surface of the impact hammer 2. The heightening column makes a certain interval between the clamping block 13 and the impact hammer 2. The abutting block 14 is arranged at a position of the grasping part 81 far from the releasing part 82, that is, it is ensured that the abutting block 14 contacts the clamping block 13 first. The shape of the abutting block 14 can be arbitrary. In this embodiment, the shape of the abutting block 14 is a hemisphere, and the diameter of the bottom surface of the abutting block 14 is larger than the bottom width of the grasping part 81, so as to achieve the effect that part of the abutting block 14 extends towards the center direction of the bayonet 6. When it is necessary to grasp the impact hammer 2, the abutting block 14 is gradually moved closer to the clamping block 13. The protruding part 131 of the clamping block 13 first enters the bayonet 6. At the same time, the abutting block 14 abuts against the outer side surface of the clamping block 13. As the clamping jaws 8 gradually move towards the impact hammer 2, since the envelope radius of the protruding part 131 is larger than the envelope radius of the clamping part 132, the two abutting blocks 14 will overcome the elastic force of the elastic member 10 and gradually separate, that is, the distance between the two abutting blocks 14 will gradually increase as they move, and then drive the distance between the clamping jaws 8 to gradually increase, so that the bayonet 6 expands until the abutting block 14 moves beyond the clamping part 132, and the abutting block 14 loses the abutment against the outer side surface of the clamping block 13. The two clamping jaws 8 will close under the action of the elastic member 10, and then drive the two abutting blocks 14 to approach each other, that is, the bayonet 6 is reduced. At this time, the part of the abutting block 14 extending out of the grasping part 81 is located below the clamping block 13, and the grasping of the impact hammer 2 is completed. At this time, the clamping jaws 8 can be moved in a direction away from the hammer pad 3, and the abutting block 14 will abut against the bottom surface of the clamping block 13, so as to drive the impact hammer 2 to move synchronously. The shape of the expanding member 15 can be various, as long as the expanding member 15 can cover one end of the stroke cavity 5 far from the hammer pad 3. In this embodiment, the shape of the expanding member 15 is circular, and the expanding member 15 is coaxially arranged with the stroke cavity 5 and the enclosing member 1. After the clamping jaws 8 grasp the impact hammer 2, the clamping jaws 8 drive the impact hammer 2 to move towards the expanding member 15. When the releasing part 82 of the clamping jaws 8 contacts the expanding member 15, the expanding member 15 makes the releasing parts 82 approach each other, so that the grasping parts 81 move away from each other, and then the bayonet 6 becomes larger. When the size of the bayonet 6 is larger than the bottom area of the clamping block 13, the impact hammer 2 is released, and the impact hammer 2 makes a free fall motion in the stroke cavity 5.

[0043] Refer to Figure 4 and Figure 5, in this embodiment, the expansion member 15 is provided with a closing groove 16 adapted to the shape of the release portion 82; the closing groove 16 is centered on the first direction 4 and is arranged in an inclined and divergent manner toward the anvil 3.

[0044] The closing groove 16 is inclined in the expansion member 15 along the direction from the center of the expansion member 15 to the outside of the expansion member 15. In this embodiment, the two closing grooves 16 form a trapezoid. The closing groove 16 penetrates the bottom surface of the expansion member 15. When the release portions 82 of the jaws 8 gradually enter the closing groove 16, the inclined closing groove 16 will cause the two release portions 82 of the jaws 8 to gradually approach each other, so that the two grasping portions 81 of the jaws 8 gradually separate, completing the release of the through-hammer 2.

[0045] Refer to Figure 6 , in this embodiment, the grasping mechanism further includes a connecting block 17, and a plurality of jaws 8 are hinged to the connecting block 17; the grasping portion 81 is located on the side of the hinge point facing the anvil 3, and the release portion 82 is located on the side of the hinge point away from the anvil 3. The shape of the connecting block 17 can be arbitrary as long as it can enable the jaws 8 to be hinged to the connecting block 17. In this embodiment, the connecting block 17 is in a C shape, and each jaw 8 is hinged in the groove of the connecting block 17 through a rotating shaft.

[0046] In this embodiment, a lifting member 18 is further included. The lifting member 18 is connected to the through-hammer 2, and the end of the lifting member 18 away from the through-hammer 2 is always located outside the stroke cavity 5.

[0047] The lifting member 18 can be a rope, a rigid rod or an elastic rod, etc. In this embodiment, the lifting member 18 is a rigid rod. The lifting member 18 penetrates through the stroke cavity 5 along the first direction 4. One end of the lifting member 18 is welded to the top surface of the connecting block 17, and the other end extends to the outside of the enclosure member 1 through the center position of the expansion member 15, that is, located outside the stroke cavity 5. When the jaws 8 move to the bottom of the stroke cavity 5 to grasp the through-hammer 2, the end of the lifting member 18 away from the connecting block 17 can still be exposed outside the expansion member 15, so as to ensure that the operator can still operate the lifting member 18 without exposing the stroke cavity 5 to the outside, thereby achieving the effect of enclosing the entire grasping mechanism in the enclosure member 1, which not only further reduces potential safety hazards, but also can avoid the influence of external factors on accelerating the wear of the grasping mechanism, such as rust caused by external water.

[0048] During use, the grasping mechanism is moved close to the core hammer 2 by the lifting member 18, and the lifting member 18 is pressed towards the hammer cushion 3, so that the latch 13 enters the bayonet 6 and is clamped by the abutting block 14, completing the grasping of the core hammer 2. At this time, the lifting member 18 can be lifted in the direction away from the hammer cushion 3 until the release portion 82 of the jaw 8 enters the closing groove 16, causing the grasping portion 81 of the jaw 8 to separate, completing the release of the core hammer 2. The core hammer 2 falls freely until it hits the hammer cushion 3, and the core hammer 2 completes a process of hammering the hammer cushion 3. Since both ends of the stroke cavity 5 are blocked by the hammer cushion 3 and the expansion member 15 respectively, and at the same time the stroke cavity 5 is surrounded by the enclosing member 1, the entire hammering process will not be exposed to the outside, eliminating the safety hazards during the hammering process, and the grasping mechanism will not be exposed to the outside, preventing rusting of the grasping mechanism.

[0049] Obviously, the above-mentioned embodiments of the present invention are only examples for clearly explaining the present invention, and are not limitations on the implementation manners of the present invention. For those of ordinary skill in the art, other different forms of changes or modifications can be made on the basis of the above description. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A geotechnical standard penetration test device, characterized in that The invention comprises a protective part (1), a core-piercing hammer (2) and a hammer pad (3); a travel cavity (5) is formed in the protective part (1) along a first direction (4), and the core-piercing hammer (2) is movably arranged in the travel cavity (5); the hammer pad (3) is arranged at one end of the travel cavity (5); a grabbing mechanism for grabbing or releasing the core-piercing hammer (2) is arranged in the protective part (1); The axis of the stroke chamber (5) is the first direction (4).

2. The standard penetration test device for geotechnical engineering according to claim 1, wherein The grabbing mechanism comprises a zoom component and a bayonet (6) for clamping a core hammer (2); the zoom component controls the size of the bayonet (6) to grab or release the core hammer (2).

3. The standard penetration test device for geotechnical engineering according to claim 2, characterized in that, The gripping mechanism comprises a plurality of clamping jaws (8); one end of the clamping jaw (8) is a gripping portion (81), and the other end is a releasing portion (82); there is a gap between the gripping portions (81) of the plurality of clamping jaws (8) to form a bayonet (6); the zoom assembly comprises a folding assembly for closing the plurality of gripping portions (81) and an expanding assembly for closing the releasing portion (82).

4. The standard penetration test device for geotechnical engineering according to claim 3, wherein The clamping jaw (8) further comprises a guide portion (83), a guide groove (9) extending along the first direction (4) is provided in the travel cavity (5), and the guide portion (83) is movably disposed in the guide groove (9).

5. The standard penetration test device for geotechnical engineering according to claim 3, characterized in that, The folding assembly comprises a plurality of elastic members (10); one end of the elastic member (10) is connected to the grasping portion (81) of one clamping jaw (8), and the other end is connected to the grasping portion (81) of another clamping jaw (8).

6. The standard penetration test device for geotechnical engineering according to claim 5, wherein The expansion assembly comprises a clamping block (13), an abutting block (14), and an expansion piece (15); the clamping block (13) is arranged on the core hammer (2), the clamping block (13) comprises a protruding portion (131) and a clamping portion (132), the clamping portion (132) is located on the side of the protruding portion (131) facing the hammer pad (3), the envelope diameter of the projection of the protruding portion (131) along the first direction (4) is smaller than the envelope diameter of the projection of the clamping portion (132) along the first direction (4), and the clamping block (13) and the bayonet (6) are located in the same straight line; the abutting block (14) is arranged on the grasping portion (81), and the abutting block (14) extends toward the center of the bayonet (6); the expansion piece (15) is arranged at one end of the stroke chamber (5) away from the hammer pad (3).

7. The geotechnical standard penetration test device according to claim 6, wherein: When the plurality of clamping jaws (8) come into contact with the expansion member (15), the expansion member (15) closes the release portions (82) of the plurality of clamping jaws (8).

8. The geotechnical standard penetration test device according to claim 7, wherein, The expansion piece (15) is provided with a closing groove (16) that matches the shape of the release portion (82); the closing groove (16) is arranged with the first direction (4) as the center and is inclined and divergently arranged toward the hammer pad (3).

9. The standard penetration test device for geotechnical engineering according to claim 4, wherein, The gripping mechanism further comprises a connecting block (17), and the plurality of clamping claws (8) are hingedly connected to the connecting block (17); the gripping portion (81) is located on a side of the hinge point facing the hammer pad (3), and the releasing portion (82) is located on a side of the hinge point away from the hammer pad (3).

10. The standard penetration test device for geotechnical engineering according to any one of claims 1-9, characterized in that, It further includes a lifting member (18), the lifting member (18) is connected to the through hammer (2), and one end of the lifting member (18) away from the through hammer (2) is always located outside the stroke cavity (5).

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