Standard penetration test apparatus for liquefaction identification

Abstract

The application discloses a standard penetration test device for liquefaction identification, and relates to the technical field of geological exploration. The device comprises a supporting frame and a drill rod, the drill rod is sleeved with a cross hammer and a lifting block, the drill rod is provided with a hammer pad, the supporting frame is provided with a traction device, the lifting block is provided with a limiting rod in the radial direction of the drill rod, the cross hammer is provided with a limiting ring groove in the circumferential direction of the cross hammer, one end of the limiting ring groove is inserted by the limiting rod, the lifting block is provided with a driving rod in the up-down direction, the driving rod is rotationally provided with a connecting rod, the connecting rod is rotationally connected with the limiting rod, the lifting block is provided with an elastic element for moving the driving rod upward, the lower surface of the limiting rod is provided with a guide surface for abutting against the upper end wall of the cross hammer, the drill rod is provided with an abutting ring plate above the hammer pad, and the abutting ring plate is used for abutting against the upper end wall of the driving rod. The application is favorable for improving the accuracy of the distance of the cross hammer lifted each time, thereby being favorable for improving the accuracy of the standard penetration test.

Description

Technical Field

[0001] This application relates to the field of geological exploration technology, and in particular to a standard penetration test apparatus for liquefaction detection. Background Technology

[0002] The standard penetration test is a geological exploration test used to determine whether a soil layer being tested is a liquefiable soil layer.

[0003] A standard penetration test apparatus is disclosed in related technologies, including a support frame, a drill rod, and a penetrometer connected to the lower end of the drill rod. The drill rod is fitted with a mandrel and a lifting block, with the lifting block positioned above the mandrel. The drill rod is equipped with a hammer pad for supporting the mandrel. The lifting block is equipped with an electromagnet, which is used to attract the mandrel. During the test, the penetrometer is first inserted into the predetermined depth of the test location through the drill rod. Then, the electromagnet attracts the mandrel. After the lifting block is raised to the predetermined height by a traction rope, the electromagnet is de-energized, and the mandrel automatically falls under its own weight and strikes the hammer pad, allowing the drill rod to move the penetrometer downward. This operation is repeated, and the total number of blows when the penetrometer moves downward by 15 cm is recorded. The number of blows obtained in the test is compared with the standard number of blows. If the number of blows obtained in the test is less than the standard number of blows, the soil layer at the test location is a liquefiable soil layer, i.e., the soil layer is relatively soft. A mark is placed above the hammer pad on the drill rod. When the lifting block raises the mandrel, the operator de-energizes the electromagnet when the lifting block moves upward to the marked position. This ensures that the mandrel is lifted the same distance each time, guaranteeing the accuracy of the test results. Regarding the aforementioned technologies, in order to increase the test speed, operators often move the lifting block upwards at a relatively fast speed. This makes it difficult for operators to ensure that the electromagnet is de-energized in time when the lifting block reaches the marked position. Consequently, the distance the hammer is lifted may be greater or less than the required standard distance, resulting in poor test accuracy. Therefore, improvements are needed. Summary of the Invention

[0004] The purpose of this application is to provide a standard penetration test apparatus for liquefaction discrimination, so as to improve the accuracy of the distance the mandrel is lifted each time, thereby improving the test precision.

[0005] This application provides a standard penetration test apparatus for liquefaction detection, which adopts the following technical solution: A standard penetration test apparatus for liquefaction discrimination includes a support frame and a drill rod. The drill rod is fitted with a mandrel and a lifting block. The drill rod is provided with a hammer pad for supporting the mandrel. The support frame is provided with a traction device for lifting the lifting block. The lifting block is provided with a limiting rod that slides radially along the drill rod. The mandrel is provided with a limiting ring groove along its circumference for one end of the limiting rod to be inserted. The lifting block is provided with a drive rod that slides vertically. The drive rod is rotatably connected to a connecting rod, which is rotatably connected to the limiting rod. When the drive rod moves downward, the limiting rod moves away from the limiting ring groove. The lifting block is provided with an elastic element for moving the drive rod upward. The lower surface of the limiting rod is provided with a guide surface that abuts against the upper end wall of the mandrel. The drill rod is provided with an abutment ring plate above the hammer pad, which abuts against the upper end wall of the drive rod.

[0006] By adopting the above technical solution, when the traction device releases the lifting block, the lifting block moves downward; when the guide surface abuts against the upper wall of the hammer, the limiting rod automatically moves away from the limiting ring groove, allowing the lifting block to continue moving downward; when the limiting rod aligns with the limiting ring groove, the elastic element causes the drive rod to move upward, allowing the drive rod to drive the limiting rod to move through the connecting rod, thus allowing the limiting rod to automatically insert into the limiting ring groove; when the traction device moves upward, the limiting rod drives the hammer upward; when the upper wall of the drive rod abuts against the abutting ring plate, the lifting block continues to move upward, and the drive rod automatically moves downward relative to the lifting block, thus allowing the limiting rod to disengage from the limiting ring groove, allowing the hammer to fall.

[0007] The drive rod and the abutment ring plate work together. Each time the hammer moves with the lifting block to the position of the abutment ring plate, the hammer will automatically detach from the lifting block and fall to strike the hammer pad. This helps to improve the accuracy of the distance the hammer is lifted each time, thereby improving the accuracy of the standard penetration test. At the same time, it also helps to increase the lifting speed of the test lifting block, thus speeding up the test.

[0008] Optionally, the support frame is provided with an installation rod for insertion into the soil layer, the peripheral wall of the installation rod is provided with an installation groove, an extension plate is embedded in the installation groove, and the extension plate is rotatably connected to the installation rod; the installation rod is provided with a rotating component for driving the extension plate to rotate outward of the installation groove.

[0009] By adopting the above technical solution, when installing the support frame, after the installation rod is inserted into the ground, the extension plate is driven to rotate outward of the installation groove by the rotating component so that the extension plate can be inserted into the soil layer. This restricts the movement of the installation rod relative to the soil layer in the vertical direction, thereby improving the stability of the support frame.

[0010] Optionally, the rotating assembly includes a drive shaft rotatably connected to the mounting rod, a drive gear connected to the drive shaft, and a driven gear connected to the extension plate, wherein the driven gear meshes with the drive gear.

[0011] By adopting the above technical solution, rotating the drive shaft, which in turn drives the driven gear to rotate via the drive gear, can drive the extension plate to rotate. The structure is simple and the operation is convenient.

[0012] Optionally, the drive shaft is slidably provided with a sliding sleeve along its own axial direction, the sliding sleeve is provided with a fixed protrusion extending along its sliding direction, and the mounting rod is provided with a fixed groove that engages with the fixed protrusion; the drive shaft is threadedly connected with a locking sleeve for abutting against the side wall of the sliding sleeve on the side opposite to the mounting rod.

[0013] By adopting the above technical solution, the fixed protrusion and the fixed groove are connected and engaged, which can restrict the rotation of the drive shaft, thereby improving the stability of the drive gear fixation, which in turn helps to improve the stability of the extension plate in maintaining its fixed position.

[0014] Optionally, the extension plate has a contact surface inclined on the side wall of the side facing away from the bottom wall of the mounting groove along its own rotation direction.

[0015] By adopting the above technical solution, the thickness of the extension plate at the corresponding position can be reduced, thereby facilitating the rotation of the extension plate away from the installation groove within the soil layer.

[0016] Optionally, it also includes a controller with a counting module; the hammer pad is provided with a counting sensor for sensing the through hammer, and both the counting sensor and the traction device are controlled by the controller.

[0017] By adopting the above technical solution, the counting sensor and the control unit work together to automatically record the number of times the hammer strikes the hammer pad, which can reduce the manual counting operation and thus improve the convenience of the test and the accuracy of the counting.

[0018] Optionally, the support frame is provided with a mounting base that slides vertically, and the mounting base is provided with a position sensor for sensing the hammer pad, the position sensor being controlled by a control element; the support frame is provided with a locking device for fixing the mounting base.

[0019] By adopting the above technical solution, the position of the mounting base can be adjusted in advance; when the hammer pad moves down with the drill rod to the position of the position sensor, the control component stops the traction device to stop the hammering action on the drill rod, which helps to improve the accuracy of the drill rod's downward movement distance and reduce the possibility of the drill rod moving too far downward.

[0020] Optionally, the inner peripheral wall of the lifting block is provided with a relief groove for accommodating the drive rod through in the vertical direction, and the bottom wall of the relief groove is provided with a sliding hole through in the radial direction of the drill rod. The limiting rod is slidably connected to the inner side wall of the sliding hole. Both ends of the lifting block are provided with connecting end plates, and the lifting block is provided with a fixing member for fixing the connecting end plates. The connecting end plates are provided with guide holes that slide with the drive rod.

[0021] By adopting the above technical solution, the drive rod slides and engages with the guide hole, which helps to improve the stability of the drive rod's sliding; the connecting end plate is connected to the lifting block through a fixing component, which facilitates the installation of the drive rod.

[0022] Optionally, the upper end wall of the hammer is provided with a receiving groove for the lifting block to be embedded in along the circumference of the hammer, and the limiting ring groove is located on the inner circumferential wall of the receiving groove.

[0023] By adopting the above technical solution, the limiting ring groove is set on the inner peripheral wall of the receiving groove, which helps to reduce the size of the lifting block, thereby reducing the weight of the lifting block, so as to facilitate the traction device to pull the lifting block.

[0024] Optionally, the upper surface of the limiting rod is rotatably provided with a ball bearing, the peripheral wall of which is used to abut against the inner top wall of the limiting ring groove.

[0025] By adopting the above technical solution, the ball bearing can reduce the friction between the limiting rod and the inner top wall of the limiting ring groove, thereby facilitating the separation of the limiting rod and the limiting ring groove, which in turn facilitates the separation of the mandrel and the lifting block. At the same time, it helps to reduce the wear between the limiting block and the inner top wall of the limiting ring groove.

[0026] In summary, this application includes at least one of the following beneficial technical effects: 1. The drive rod and the abutment ring plate cooperate with each other. After the mandrel moves to the position of the abutment ring plate with the lifting block each time, the mandrel can automatically detach from the lifting block and fall to strike the hammer pad. This helps to improve the accuracy of the distance the mandrel is lifted each time, thereby improving the accuracy of the standard penetration test. At the same time, it helps to increase the lifting speed of the test lifting block to speed up the test. 2. When installing the support frame, after inserting the mounting rod into the ground, the extension plate is driven to rotate outward of the mounting groove by the rotating component so that the extension plate can be inserted into the soil layer. This restricts the movement of the mounting rod relative to the soil layer in the vertical direction, thereby improving the stability of the support frame. 3. The counting sensor, position sensor and control unit work together to automatically record the number of times the hammer strikes the hammer pad, which can reduce the manual counting operation and thus improve the convenience of the test and the accuracy of the counting. Attached Figure Description

[0027] Figure 1This is an overall schematic diagram of a standard penetration test apparatus for liquefaction discrimination according to an embodiment of this application.

[0028] Figure 2 yes Figure 1 Enlarged view of part A in the image.

[0029] Figure 3 It is a cross-sectional schematic diagram of the structure used for connecting devices.

[0030] Figure 4 This is a schematic diagram used to illustrate the structure of the mounting rod.

[0031] Figure 5 It is a cross-sectional schematic diagram used to show the structure of the rotating component.

[0032] In the diagram, 1. Support frame; 11. Support sleeve; 12. Traction device; 13. Guide rod; 131. Mounting base; 1311. Mounting screw hole; 1312. Position sensor; 14. Locking fastener; 2. Drill rod; 21. Penetrator; 3. Through hammer; 31. Receiving groove; 32. Limiting ring groove; 4. Lifting block; 41. Relief groove; 411. Sliding hole; 42. Connecting end plate; 421. Guide hole; 5. Hammer pad; 51. Counting sensor; 6. Connecting device; 61. Limiting rod; 611 612. Guide surface; 62. Ball bearing; 63. Drive rod; 64. Retaining ring; 65. Connecting rod; 7. Elastic element; 86. Abutting ring plate; 77. Mounting rod; 78. Mounting groove; 79. Extension plate; 70. Contact surface; 71. Mounting hole; 72. Fixing groove; 80. Rotating assembly; 81. Drive shaft; 81. Sliding sleeve; 81. Connecting key; 81. Fixing protrusion; 81. Connecting groove; 81. Locking sleeve; 82. Drive gear; 83. Driven gear. Detailed Implementation

[0033] The following is in conjunction with the appendix Figure 1 -Appendix Figure 5 This application will be described in further detail below.

[0034] A standard penetration test apparatus for liquefaction detection, referring to Figure 1 and Figure 2 The system includes a support frame 1, a drill rod 2, and a control unit (not shown in the figure), the control unit being a PLC. A support sleeve 11 is welded and fixed to the support frame 1. The drill rod 2 is inserted through the support sleeve 11, and the drill rod 2 and the support sleeve 11 are in sliding fit. A penetrator 21 is fixedly installed at the lower end of the drill rod 2. A through hammer 3, a lifting block 4, and a hammer pad 5 are sleeved on the upper end of the drill rod 2. Both the lifting block 4 and the hammer pad 5 are cylindrical. The inner circumferential wall of the hammer pad 5 is welded and fixed to the circumferential wall of the drill rod 2. The lifting block 4 is located above the hammer pad 5, and the through hammer 3 is located between the lifting block 4 and the hammer pad 5.

[0035] Reference Figure 1 The support frame 1 is equipped with a traction device 12, which includes a winch. The traction rope of the traction device 12 passes around a fixed pulley installed on the support frame 1 and is fixedly connected to the lifting block 4. The motor of the traction device 12 is electrically connected to the control unit via a cable. The lifting block 4 is equipped with a connecting device 6, which is used to connect the mandrel 3 to the lifting block 4 so that the lifting block 4 can drive the mandrel 3 to move upward. When the mandrel 3 moves to a predetermined distance, the connecting device 6 automatically releases the mandrel 3, so that the mandrel 3 can automatically fall and strike the hammer pad 5, thereby causing the drill rod 2 to drive the penetrometer 21 to move into the soil layer.

[0036] Reference Figure 2 The hammer pad 5 is fixedly equipped with a counting sensor 51, which includes a photoelectric sensor for sensing the position of the hammer 3. The counting sensor 51 is electrically connected to the control unit via a cable. The control unit counts once each time the hammer 3 contacts the hammer pad 5, thereby achieving the effect of automatic counting.

[0037] Reference Figure 1 and Figure 2 The support frame 1 is fixedly mounted with a guide rod 13, the guide rod 13 being arranged along the vertical direction. A mounting base 131 is fitted onto the guide rod 13, and the mounting base 131 is slidably connected to the guide rod 13 along its length to allow for adjustment of the mounting base 131's position. A mounting screw hole 1311 is provided through the outer peripheral wall of the mounting base 131, and the inner side wall of the mounting screw hole 1311 is connected to the inner peripheral wall of the mounting base 131. The support frame 1 is provided with a locking fastener 14, which includes a screw threaded into the inner side wall of the mounting screw hole 1311. The locking fastener 14 can abut against the peripheral wall of the guide rod 13 to fix the mounting base 131. A position sensor 1312 is fixedly mounted on the mounting base 131, the position sensor 1312 including a photoelectric sensor. The position sensor 1312 is electrically connected to a control unit via a cable to sense the position of the hammer pad 5. When the hammer pad 5 moves with the drill rod 2 to the position of the position sensor 1312, the control unit stops the motor of the traction device 12, that is, stops lifting the through hammer 3.

[0038] Reference Figure 1 and Figure 3The connecting device 6 includes a limiting rod 61, a driving rod 62, a connecting rod 63, an elastic element 64, and an abutment ring plate 65. One end of the limiting rod 61 is hinged to the connecting rod 63, and the end of the connecting rod 63 away from the limiting rod 61 is hinged to the driving rod 62. A clearance groove 41 is formed through the inner peripheral wall of the lifting block 4 in the vertical direction. A sliding hole 411 is formed through the bottom wall of the clearance groove 41 in the radial direction of the lifting block 4. The driving rod 62 is located within the clearance groove 41, and the limiting rod 61 is inserted into the sliding hole 411, slidingly connected to the inner sidewall of the sliding hole 411 along its length. Connecting end plates 42 are provided at both ends of the lifting block 4. The lifting block 4 is equipped with fixing components, including screws, and the connecting end plates 42 are connected to the lifting block 4 through these fixing components. The connecting end plate 42 has a guide hole 421 extending through it along its thickness direction. The guide hole 421 is slidably engaged with the drive rod 62, allowing the drive rod 62 to slide relative to the lifting block 4 in the vertical direction. When the drive rod 62 slides downward, it drives the limiting rod 61 to move in the axial direction of the lifting block 4 via the connecting rod 63.

[0039] Reference Figure 3 The elastic element 64 includes a spring and is sleeved on the drive rod 62. A fixing ring 621 is welded and fixed to the peripheral wall of the drive rod 62 located above the elastic element 64. One end of the elastic element 64 abuts against the fixing ring 621, and the other end abuts against the connecting end plate 42 located below, so as to support the drive rod 62, thereby allowing one end of the limiting rod 61 away from the axis of the lifting block 4 to be exposed in the sliding hole 411.

[0040] Reference Figure 3 The upper end wall of the hammer 3 has a receiving groove 31 along its circumference for inserting the lifting block 4. A guide surface 61 is provided on the lower surface of the end of the limiting rod 61 located outside the sliding hole 411. One end of the guide surface 61 is connected to the lower surface of the limiting rod 61, and the other end extends upwards and connects to the end wall of the limiting rod 61 opposite to the axis of the lifting block 4. When the lifting block 4 moves downwards, the guide surface 611 abuts against the upper end wall of the hammer 3; under the gravity of the lifting block 4, the limiting rod 61 automatically moves towards the axis of the lifting block 4, allowing it to retract into the sliding hole 411, thus allowing the lifting block 4 to move into the receiving groove. Simultaneously, the elastic element 64 undergoes compression deformation. A limiting ring groove 32 is formed on the inner circumferential wall of the receiving groove along the circumferential direction of the receiving groove; when the limiting rod 61 moves down with the lifting block 4 to the position where the limiting rod 61 is aligned with the limiting ring groove 32, the deformation of the elastic element 64 is restored, which can cause the driving rod 62 to move up, so that the limiting rod 61 can be inserted into the limiting ring groove 32, thereby allowing the through hammer 3 to be connected to the lifting block 4, so that the lifting block 4 can drive the through hammer 3 to move up.

[0041] Reference Figure 3The upper end wall of the drive rod 62 protrudes from the corresponding guide hole 421; the abutment ring plate 65 and the peripheral wall of the drill rod 2 located above the lifting block 4 are welded and fixed. During the process of the lifting block 4 driving the through hammer 3 to move upward, when the drive rod 62 abuts against the lower surface of the abutment ring plate 65, there is a gap between the lifting block 4 and the abutment ring plate 65, so that the lifting block 4 can continue to move upward, thereby allowing the drive rod 62 to move downward relative to the lifting block 4, so that the limiting rod 61 can move in the axial direction of the lifting block 4, thereby allowing the limiting rod 61 to separate from the limiting ring groove 32, moving the through hammer 3 to separate from the lifting block 4, so that the through hammer 3 can automatically fall and hammer the hammer pad 5. The upper end wall of the limiting rod 61 is rotatably provided with a ball 612, the peripheral wall of the ball 612 abuts against the inner top wall of the limiting ring groove 32, so that the limiting rod 61 can move relative to the inner top wall of the limiting ring groove 32, thereby facilitating the disengagement of the limiting rod 61 from the limiting ring groove 32.

[0042] Reference Figure 4 A downwardly extending mounting rod 7 is welded and fixed to the lower end of the support frame 1. A mounting groove 71 is formed on the peripheral wall of the mounting rod 7, and an extension plate 711 is embedded within the mounting groove 71. One end of the extension plate 711 is rotatably connected to the mounting rod 7, and the axial direction of the rotation axis of the extension plate 711 is set along the length direction of the mounting rod 7. The mounting rod 7 is provided with a rotating assembly 8, which drives the extension plate 711 to rotate to the outside of the mounting groove 71, allowing the extension plate 711 to be inserted into the soil layer. This restricts the movement of the mounting rod 7 relative to the soil layer along its own length direction, thereby improving the stability of the support frame 1. A contact surface 7111 is inclined on the side wall of the extension plate 711 along its own rotation direction and away from the bottom wall of the mounting groove 71. The contact surface 7111 extends along the rotation direction of the extension plate 711 and connects to the lower surface of the extension plate 711, facilitating the insertion of the extension plate 711 into the soil layer.

[0043] Reference Figure 5 The rotating assembly 8 includes a drive shaft 81, a drive gear 82 (teeth not shown in the figure), and a driven gear 83 (teeth not shown in the figure). The drive gear 82 is fixedly connected to one end of the drive shaft 81, thereby fixing the gear to the extension plate 711. A mounting hole 72 is formed on the upper end wall of the mounting rod 7, and the end of the drive shaft 81 located at the drive gear 82 is inserted into the mounting hole 72, with the drive gear 82 meshing with the driven gear 83. The drive shaft 81 is rotatably connected to the inner circumferential wall of the mounting hole 72 via a bearing. Rotating the drive shaft 81 causes the drive gear 82 to rotate, thus causing the extension plate 711 to rotate synchronously.

[0044] Reference Figure 5A sliding sleeve 811 is fitted onto the drive shaft 81, and a connecting key 8111 is fixedly installed on the inner peripheral wall of the sliding sleeve 811. A connecting groove 812 is formed on the peripheral wall of the drive shaft 81 along the axial direction of the drive shaft 81, and the connecting key 8111 slides into the connecting groove 812 to allow the sliding sleeve 811 to slide relative to the drive shaft 81. A fixing protrusion 8112 is welded and fixed to the lower end wall of the sliding sleeve 811, and a fixing groove 73 is formed on the upper end wall of the mounting rod 7. Multiple fixing grooves 73 are spaced apart along the circumference of the mounting rod 7. The fixing protrusion 8112 and the fixing groove 73 are inserted into each other to restrict the rotation of the sliding sleeve 811 relative to the mounting rod 7, thereby fixing the drive shaft 81 and improving the stability of the extension plate 711.

[0045] Reference Figure 5 The peripheral wall of the drive shaft 81 is threaded with a locking sleeve 813, which is located on the side of the sliding sleeve 811 away from the mounting rod 7. When the locking sleeve 813 is rotated, it can abut against the end wall of the corresponding end of the sliding sleeve 811, thereby restricting the movement of the sliding sleeve 811 and improving the stability of the engagement between the fixed protrusion 8112 and the fixed groove 73.

[0046] The implementation principle of this application embodiment is as follows: During the test, drill rod 2 is first used to drill a hole to the predetermined depth at the test location; then, lifting block 4 is lifted by traction device 12, and the mandrel 3 is moved upward; when drive rod 62 abuts against the abutting ring plate 65, drive rod 62 moves downward relative to lifting block 4, so that limiting rod 61 can separate from limiting ring groove 32, allowing mandrel 3 to fall and strike hammer pad 5; then traction device 12 moves lifting block 4 downward, and when guide surface 611 abuts against the upper end wall of mandrel 3, limiting rod 61 retracts into sliding hole 411, so that lifting block 4 can insert into receiving groove 31, so that limiting rod 61 can insert into limiting ring groove 32, so that lifting block 4 can drive mandrel 3 to move upward again, and strike hammer pad 5 again. As above, first insert penetrator 21 downward into the soil layer 15cm, then reset the counter of control component to zero, and strike hammer pad 5 again, and record the number of blows when the tube moves downward 15cm again. By comparing the number of hammer blows obtained from the test with the standard number of hammer blows, it can be determined whether the soil layer is a liquefiable soil layer.

[0047] The limiting rod 61, driving rod 62, connecting rod 63, elastic element 64 and abutting ring plate 65 cooperate with each other to allow the mandrel 3 to automatically disengage from the lifting block 4 when it is located at the abutting ring plate 65, thereby improving the accuracy of the distance the mandrel 3 is lifted each time, and thus improving the accuracy of the test.

[0048] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A standard penetration test apparatus for liquefaction discrimination, comprising a support frame (1) and a drill rod (2), wherein the drill rod (2) is fitted with a mandrel (3) and a lifting block (4), the drill rod (2) is provided with a hammer pad (5) for supporting the mandrel (3), and the support frame (1) is provided with a traction device (12) for lifting the lifting block (4), characterized in that: The lifting block (4) is provided with a limiting rod (61) that slides radially along the drill rod (2). The through-hole hammer (3) is provided with a limiting annular groove (32) along its circumference for one end of the limiting rod (61) to be inserted. The lifting block (4) is provided with a driving rod (62) that slides vertically. The driving rod (62) is rotatably connected to a connecting rod (63), and the connecting rod (63) is rotatably connected to the limiting rod (61). When the driving rod (62) moves downward, the limiting rod (61) is... The positioning rod (61) moves away from the limiting ring groove (32); the lifting block (4) is provided with an elastic element (64) for moving the driving rod (62) upward; the lower surface of the limiting rod (61) is inclinedly provided with a guide surface (611) for abutting against the upper end wall of the through hammer (3); the drill rod (2) is provided with an abutting ring plate (65) at a position above the hammer pad (5), and the abutting ring plate (65) is used to abut against the upper end wall of the driving rod (62); The inner peripheral wall of the lifting block (4) is provided with a relief groove (41) for accommodating the drive rod (62) through the vertical direction. The bottom wall of the relief groove (41) is provided with a sliding hole (411) through the radial direction of the drill rod (2). The limiting rod (61) is slidably connected to the inner side wall of the sliding hole (411). Both ends of the lifting block (4) are provided with connecting end plates (42). The lifting block (4) is provided with a fixing member for fixing the connecting end plate (42). The connecting end plate (42) is provided with a guide hole (421) that slides with the drive rod (62). The upper end wall of the hammer (3) is provided with a receiving groove (31) for the lifting block (4) to be embedded in along the circumference of the hammer (3), and the limiting ring groove (32) is located on the inner circumferential wall of the receiving groove (31). The elastic element (64) includes a spring and is sleeved on the drive rod (62). A retaining ring (621) is welded to the peripheral wall of the drive rod (62) located above the elastic element (64). One end of the elastic element (64) abuts against the retaining ring (621), and the other end abuts against the connecting end plate (42) located below, so as to support the drive rod (62) and allow one end of the limiting rod (61) away from the axis of the lifting block (4) to be exposed in the sliding hole (411).

2. The standard penetration test apparatus for liquefaction discrimination according to claim 1, characterized in that: The support frame (1) is provided with an installation rod (7) for inserting into the soil layer. The peripheral wall of the installation rod (7) is provided with an installation groove (71). An extension plate (711) is embedded in the installation groove (71). The extension plate (711) is rotatably connected to the installation rod (7). The installation rod (7) is provided with a rotating component (8) for driving the extension plate (711) to rotate outward from the installation groove (71).

3. The standard penetration test apparatus for liquefaction discrimination according to claim 2, characterized in that: The rotating assembly (8) includes a drive shaft (81) rotatably connected to the mounting rod (7), a drive gear (82) connected to the drive shaft (81), and a driven gear (83) connected to the extension plate (711), wherein the driven gear (83) meshes with the drive gear (82).

4. The standard penetration test apparatus for liquefaction discrimination according to claim 3, characterized in that: The drive shaft (81) is slidably provided with a sliding sleeve (811) along its own axial direction. The sliding sleeve (811) is provided with a fixed protrusion (8112) extending along its sliding direction. The mounting rod (7) is provided with a fixed groove (73) that is inserted and engaged with the fixed protrusion (8112). The drive shaft (81) is threadedly connected with a locking sleeve (813) for abutting against the side wall of the sliding sleeve (811) on the side opposite to the mounting rod (7).

5. The standard penetration test apparatus for liquefaction discrimination according to claim 2, characterized in that: The extension plate (711) has a contact surface (7111) inclined on the side wall of the side facing away from the bottom wall of the mounting groove (71) along its own rotation direction.

6. The standard penetration test apparatus for liquefaction discrimination according to claim 1, characterized in that: It also includes a controller with a counting module; the hammer pad (5) is provided with a counting sensor (51) for sensing the through hammer (3), and the counting sensor (51) and the traction device (12) are both controlled by the controller.

7. The standard penetration test apparatus for liquefaction discrimination according to claim 6, characterized in that: The support frame (1) is provided with a mounting base (131) that slides vertically. The mounting base (131) is provided with a position sensor (1312) for sensing the hammer pad (5). The position sensor (1312) is controlled by a control component. The support frame (1) is provided with a locking fastener (14) for fixing the mounting base (131).

8. The standard penetration test apparatus for liquefaction discrimination according to claim 1, characterized in that: The upper surface of the limiting rod (61) is rotatably provided with a ball (612), and the peripheral wall of the ball (612) is used to abut against the inner top wall of the limiting ring groove (32).

Images