A standard penetration test device

Abstract

The present application relates to the field of geotechnical engineering investigation, and in particular to a standard penetration test device. The standard penetration test device includes a sealing sleeve, the bottom of which is an inverted cone structure; a standard penetration head, which is connected to the bottom end of the outside of the sealing sleeve; a standard penetration mechanism, which is located inside the sealing sleeve, and includes a core hammer, a hammer pad connected to a sensor, and a guide rod, the hammer pad is installed at the bottom end of the sealing sleeve, the guide rod is located on the axis of the sealing sleeve, and the bottom is connected to the hammer pad, and the core hammer is penetrated on the guide rod; a transmission mechanism, which is located inside the sealing sleeve and is used to drive the core hammer to move upward along the guide rod for a certain distance and then release the core hammer. The embodiment of the present application provides a standard penetration test device to solve the problem in the related art that most of the energy of the impact hammer is lost on the drill rod, resulting in inaccurate test results.

Description

Technical Field

[0001] The present application relates to the field of geotechnical engineering investigation, and in particular to a standard penetration test device. Background Art

[0002] In the field of engineering investigation, the standard penetration test is an important way to confirm the physical and mechanical properties of soil and sand layers. Currently, most of the existing standard penetration test equipment is traditional equipment from decades ago. This equipment has two obvious defects. One is that the impact hammer of the standard penetration test is tested at the hole mouth, and most of the energy of the impact hammer is lost in the drill pipe, resulting in inaccurate test results;

[0003] Secondly, the impact hammer in the current standard penetration test is still manually operated, which will result in the time interval between each hammer blow not necessarily being constant. Studies by relevant scholars have shown that the frequency of dynamic loads has a certain impact on the bearing capacity of the soil layer. Therefore, human errors are likely to lead to inaccurate test results. Summary of the invention

[0004] The embodiment of the present application provides a standard penetration test device to solve the problem in the related art that most of the energy of the impact hammer is lost in the drill rod, resulting in inaccurate test results.

[0005] To achieve the above objectives, the present application provides a standard penetration test device, which includes:

[0006] A sealing sleeve, wherein the bottom of the sealing sleeve is an inverted cone structure;

[0007] A standard penetration head connected to the bottom end of the outside of the sealing sleeve;

[0008] The standard penetration mechanism is located inside the sealing sleeve, and includes a penetration hammer, a hammer pad connected to a sensor, and a guide rod. The hammer pad is installed at the bottom end of the sealing sleeve, and the guide rod is located on the axis of the sealing sleeve, and the bottom is connected to the hammer pad. The penetration hammer is penetrated on the guide rod;

[0009] The transmission mechanism is located inside the sealing sleeve and is used to drive the core piercing hammer to move upward along the guide rod for a certain distance and then release the core piercing hammer.

[0010] In some embodiments, the guide rod is a hollow structure, and a avoidance groove extending along the length direction thereof is provided on each side;

[0011] The transmission mechanism comprises:

[0012] A driving gear connected to a driver;

[0013] A driven gear, which is located below the driving gear;

[0014] A chain is connected to the driving gear and the driven gear, and the chain penetrates the guide rod along the length direction of the guide rod;

[0015] The retaining ring is arranged on the chain and has two compression arms which can move in two avoidance grooves respectively, and two supporting parts for supporting the through hammer. One end of the two compression arms is connected together, and the other end is respectively connected to the two supporting parts.

[0016] In some embodiments, the retaining spring further includes a spring disposed between the two compression arms.

[0017] In some embodiments, when the retaining spring is in a free state, the distance between the two supporting portions is greater than the inner hole diameter of the hammer;

[0018] When the clamping spring is in a compressed state, the distance between the two supporting portions is smaller than the inner hole diameter of the core hammer.

[0019] In some embodiments, the standard penetration test device further includes a lifting mechanism, which includes a lifting cable and a lifting cable drum for winding up the lifting cable, wherein one end of the lifting cable is connected to the top of the sealing sleeve, and the other end is wound around the lifting cable drum.

[0020] In some embodiments, the lifting cable further comprises:

[0021] A cable, one end of which is connected to the transmission mechanism and the other end of which is used to connect to an external power source;

[0022] A signal line, one end of which is connected to the sensor on the hammer pad, and the other end of which is connected to the display device.

[0023] In some embodiments, it also includes:

[0024] The counting mechanism comprises a counting rope and a counting rope drum. The counting rope is marked with a length, and one end of the counting rope is connected to the sealing sleeve, and the other end is connected to the counting rope drum.

[0025] In some embodiments, the sealing sleeve is provided with a valve for evacuating the interior of the sealing sleeve to a vacuum.

[0026] In some embodiments, a centering piece for adapting to the aperture of the penetration hole is disposed on the outer side of the sealing sleeve.

[0027] In some embodiments, a partition is installed above the interior of the sealing sleeve, and the top end of the guide rod is fixed on the partition.

[0028] The beneficial effects of the technical solution provided by this application include:

[0029] The embodiment of the present application provides a standard penetration test device. Since the standard penetration device is arranged in a sealing sleeve and the standard penetration head is located at the bottom of the sealing sleeve, when in use, the sealing sleeve and the standard penetration head are first lowered to the bottom of the penetration hole; the transmission mechanism lifts the core hammer, and after reaching a certain height, the core hammer is released, so that the core hammer performs free fall motion and falls onto the hammer pad. Most importantly, the embodiment provided by the present application no longer uses a drill rod, but directly lowers the device to the bottom of the penetration hole, the standard penetration mechanism performs a standard penetration motion in the sealing sleeve, and directly transmits the force of the core hammer falling to the standard penetration head, and the standard penetration head penetrates the rock and soil layer, completely eliminating the loss of the impact energy of the impact hammer caused by the drill rod and the friction loss between the drill rod and the hole wall. Therefore, it can solve the problem in the related art that most of the energy of the impact hammer is lost in the drill rod, resulting in inaccurate test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0031] Figure 1 A schematic diagram of the internal structure of a standard penetration test device provided in an embodiment of the present application;

[0032] Figure 2 A schematic diagram of a standard penetration test device provided in an embodiment of the present application located in a penetration hole;

[0033] Figure 3 Schematic diagram of the positional relationship between the guide rod and the retaining spring;

[0034] Figure 4 A cross-sectional view of a lifting cable;

[0035] Figure 5 It is a structural schematic diagram of the circlip;

[0036] Figure 6 Schematic diagram of the markings on the counting rope.

[0037] In the figure: 1. standard penetration head; 2. sealing sleeve; 21. upper chamber; 22. middle chamber; 23. lower chamber; 24. partition; 25. valve; 26. centering plate; 27. wire groove; 3. transmission mechanism; 31. driving gear; 32. driven gear; 33. chain; 4. standard penetration mechanism; 41. core hammer; 42. hammer pad; 43. guide rod; 431. avoidance groove; 5. lifting mechanism; 51. lifting cable; 511. wire rope; 512. cable; 513. signal line; 52. lifting cable drum; 6. counting mechanism; 61. counting rope; 62. counting rope drum; 7. retaining spring; 71. compression arm; 72. supporting part; 73. spring; 74. connecting piece; 8. penetration hole; 9. bracket; 91. horizontal axis; 10. display device. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0039] The embodiment of the present application provides a standard penetration test device, which can solve the problem in the related art that most of the energy of the impact hammer is lost in the drill rod, resulting in inaccurate test results.

[0040] See also Figures 1 to 6 As shown, the present application provides a standard penetration test device, including a sealing sleeve 2, a standard penetration head 1, and a standard penetration mechanism 4 and a transmission mechanism 3 arranged in the sealing sleeve 2. Specifically, the standard penetration head 1 is connected to the lower part of the outside of the sealing sleeve 2, and the standard penetration head 1 is directly used to penetrate the soil layer, and the drill rod is no longer used, which completely eliminates the loss of impact energy of the drill rod to the core hammer 41. Preferably, the sealing sleeve 2 is cylindrical to adapt to the shape of the penetration hole; and the bottom of the sealing sleeve 2 is an inverted cone structure to reduce the obstruction when the test device penetrates the soil layer downward.

[0041] Specifically, the standard penetration mechanism 4 is located inside the sealing sleeve 2 and close to the bottom of the sealing sleeve 2, with the purpose of transferring the hammering energy of the core hammer 41 to the standard penetration head 1 as much as possible; Figure 1 As shown, the standard penetration mechanism 4 includes a core penetration hammer 41, a hammer pad 42 and a guide rod 43. The hammer pad 42 is installed at the bottom end of the sealing sleeve 2. The guide rod 43 is located on the axis of the sealing sleeve 2, and the bottom is connected to the center of the hammer pad 42. The core penetration hammer 41 is penetrated on the guide rod 43; preferably, a sensor is connected to the hammer pad 42, and the sensor is used to sense the hammer energy of the core penetration hammer 41, and record and transmit the data.

[0042] Specifically, the transmission mechanism 3 is also located in the sealing sleeve 2, and is used to drive the core piercing hammer 41 to move upward along the guide rod 43 for a certain distance, and then release the core piercing hammer 41, so that the core piercing hammer 41 performs free fall motion.

[0043] The embodiment of the present application provides a standard penetration test device. Since the standard penetration mechanism 4 is arranged in the sealing sleeve 2 and the standard penetration head 1 is located at the bottom of the sealing sleeve 2, when in use, the sealing sleeve 2 and the standard penetration head 1 are first lowered to the bottom of the penetration hole 8; the transmission mechanism 3 lifts the core hammer 41, and releases the core hammer 41 after reaching a certain height, so that the core hammer 41 performs free fall motion and falls onto the hammer pad 42. Most importantly, the embodiment provided by the present application no longer uses a drill rod, and directly lowers the device to the bottom of the penetration hole 8. The standard penetration mechanism 4 performs a standard penetration motion in the sealing sleeve 2, and directly transmits the force of the core hammer 41 falling to the standard penetration head 1. The standard penetration head 1 penetrates the rock and soil layer, completely eliminating the loss of the impact energy of the core hammer by the drill rod and the friction loss between the drill rod and the hole wall. Therefore, it can solve the problem that the energy of the impact hammer is mostly lost in the drill rod in the related art, resulting in inaccurate test results.

[0044] In some optional embodiments, see Figure 3 As shown, the guide rod 43 is a cylinder, and the cylinder is a hollow structure. A avoidance groove 431 extending along the length direction of the guide rod 43 is provided on both sides. Specifically, the connection between the hammer pad 42 and the guide rod 43 is also hollow, and the sensor is arranged in a circle of the hammer pad 42. In addition, the length of the avoidance groove 431 is limited, and the distance from the top of the avoidance groove to the upper surface of the hammer pad 42 is 76 cm. It should be noted that 76 cm is the standard value of the drop distance in the standard penetration test.

[0045] Recombination Figure 1 As shown, the transmission mechanism 3 includes a driving gear 31, a driven gear 32 and a chain 33, wherein the driven gear 32 is located below the driving gear 31, and the driving gear 31 is connected to a driver, and the chain 33 is connected between the driving gear 31 and the driven gear 32, the driver drives the driving gear 31 to rotate, and the driven gear 32 is driven to rotate via the chain 33; and the chain 33 penetrates the guide rod 43 along the length direction of the guide rod 43.

[0046] In one embodiment, the driving gear 31 and the driven gear 32 are both mounted on the inner wall of the sealing sleeve 2 , and the hammer washer 42 is clamped in the sealing sleeve 2 and located above the driven gear 32 .

[0047] In one embodiment, in combination Figure 1As shown, the interior of the sealing sleeve 2 is divided into an upper chamber 21, a middle chamber 22 and a lower chamber 23 by two partitions 24, wherein the partitions 24 are provided with through holes to accommodate the chain 33 passing through; the standard penetration mechanism 4 is located in the middle chamber 22, and the top end of the guide rod 43 is connected to the upper partition 24, which can assist in fixing the guide rod 43 so that the guide rod 43 does not shake when the core hammer 41 moves up and down.

[0048] Recombination Figure 1 , Figure 3 and Figure 5 As shown, the chain 33 is provided with a clip 7, and the clip 7 has two compression arms 71 that can move in two avoidance grooves 431, and two supporting parts 72 for supporting the through hammer 41. One end of the two compression arms 71 is connected together, and the inner end is connected to the two supporting parts 72 respectively. Preferably, the two compression arms 71 are connected together by a connecting member 74. Specifically, the connecting member 74 uses a torsion spring, and the torsion spring together with the two compression arms 71 form a structure similar to a clip. The different states of the compression arm 71 can be achieved by changing the force of the torsion spring, and then the different states of the clip 7 can be achieved.

[0049] It should be noted that when the retaining spring 7 is in a free state, the distance between the two supporting parts 72 is greater than the inner hole diameter of the core hammer 41, so as to support the core hammer 41 to move upward; when the retaining spring 7 is in a compressed state, the distance between the two supporting parts 72 is less than the inner hole diameter of the core hammer 41, and the core hammer 41 loses support and falls.

[0050] When the conveying mechanism 3 starts to convey, the chain 33 moves upward together with the circlip 7, and the supporting portion 72 of the circlip supports the core hammer 41 and moves upward through the avoidance groove 431. After reaching a certain height, the avoidance groove 431 disappears, but the circlip 7 still has a tendency to move upward with the chain 33, so the compression arm 71 is compressed, and the distance between the supporting portion 72 connected to the compression arm 71 is smaller than the inner hole diameter of the core hammer 41, and the core hammer 41 loses support and falls, landing on the hammer pad 42, completing a hammering.

[0051] In some optional embodiments, see Figure 5 As shown, the retaining spring 7 also includes a spring 73, and the spring 73 is connected between the two compression arms 71, forming a triangle with the two compression arms 71, and is used to support the two compression arms 71. When the retaining spring 7 is to be restored from a compressed state to a free state, the spring 73 can provide a restoring force.

[0052] In some optional embodiments, see Figure 2 As shown, a bracket 9 is set up near the opening of the penetration hole 8;

[0053] The test device also includes a lifting mechanism 5. Specifically, the lifting mechanism 5 includes a lifting cable 51 and a lifting cable drum 52 for winding up the lifting cable 51. One end of the lifting cable 51 is connected to the top of the sealing sleeve 2, and the other end is wound around the lifting cable drum 52. The lifting cable drum 52 is installed on the bracket 9 and can rotate around the horizontal axis 91 on the bracket 9.

[0054] Preferably, a wire groove 27 is provided at the top of the sealing sleeve 2, and the lifting cable 51 is connected to the sealing sleeve 2 through the wire groove 27; preferably, the lifting cable 51 includes a steel wire rope 511.

[0055] In some optional embodiments, see Figure 4 As shown, the lifting cable 51 also includes a cable 512 and a signal line 513, wherein one end of the cable 512 is connected to the transmission mechanism 3, and the other end is used to connect to an external power supply to power the transmission mechanism 3. Specifically, the cable 512 is connected to a driver, and the driver tends to rotate the active gear 31; one end of the signal line 513 is connected to a sensor on the hammer pad 42 to obtain the impact data of the core hammer 41, and the other end is connected to a display device 10 to intuitively display the impact force value of the core hammer.

[0056] In some optional embodiments, see Figure 2 As shown, the standard penetration test device also includes a counting mechanism 6, which includes a counting rope 61 and a counting rope drum 62. The counting rope 61 is marked with a length, and one end of the counting rope 61 is connected to the sealing sleeve 2, and the other end is connected to the counting rope drum 62. The counting rope drum 62 is also installed on the bracket 9, and the counting rope drum 62 can rotate around the horizontal axis 91 on the bracket 9. Specifically, a length mark is made on the counting rope 61 starting from the orifice position of the penetration hole 8 to determine the penetration depth. It should be noted that the material of the counting rope 61 cannot be stretched, and a nylon rope that does not deform can be used.

[0057] In some optional embodiments, see Figure 1 As shown, a valve 25 for evacuating the inside of the sealing sleeve 2 is provided on the sealing sleeve 2. Specifically, evacuating the sealing sleeve 2 can reduce the running resistance of the standard penetration mechanism 4 to the greatest extent, and ensure the accuracy of the test data.

[0058] In some optional embodiments, see Figure 1 and Figure 2As shown, a centering piece 26 for adapting to the aperture of the penetration hole 8 is arranged on the outer side of the sealing sleeve 2. Specifically, the diameter of the sealing sleeve 2 is generally smaller than the diameter of the penetration hole 8. In order to maintain the vertical state of the sealing sleeve 2 during the test, a centering piece 26 is arranged to enable the sealing sleeve 2 to adapt to the aperture. The centering piece 26 is arranged around the circumference of the sealing sleeve 2, or there are multiple centering pieces 26, and the multiple centering pieces 26 are arranged around the circumference of the sealing sleeve 2 at intervals.

[0059] The present application provides a standard penetration test device, and its specific implementation is as follows:

[0060] Step 1: After drilling the penetration hole 8 to a certain depth using a drilling tool, take out the drilling tool, install the bracket 9 at the opening of the penetration hole 8, and install the lifting cable drum 52 and the counting rope drum 62 on the bracket;

[0061] Step 2: Complete the installation of the transmission mechanism 3 and the standard penetration mechanism 4 inside the sealing sleeve 2. Initially, the core hammer 41 is located on the hammer pad 42; evacuate the inside of the sealing sleeve 2 through the valve 25, and connect the lifting cable 51 and the counting rope 61;

[0062] Step 3: Install the standard penetration head 1 at the bottom of the sealing sleeve 2, and lower the sealing sleeve 2 and the standard penetration head 1 to the bottom of the penetration hole 8. Specifically, after the standard penetration head 1 is lowered to the bottom of the hole, continue to lower the lifting cable 51 to a certain depth so that the sealing sleeve 2 is no longer subjected to the tension from the lifting cable 51; at the same time, tighten the counting rope 61, and make a length mark on the counting rope 61 located outside the penetration hole 8 starting from the position of the hole mouth, combined with Figure 6 As shown, a mark is made at the bottom of the counting rope 61 and at a distance b from one end of the penetration hole 8. In one embodiment, b is 15 cm, that is, Figure 6 Then, measure three sections of the same length a on the counting rope 61, where a can be equal to 10 cm, and mark them one by one. Figure 6 Section a in the figure, section b is the standard penetration depth and is not counted;

[0063] Step 4: Turn on the power supply, the driver drives the driving gear 31 to rotate, and the retaining spring 7 in the free state lifts the core hammer 41 to move upward along the guide rod 43. After rising to 76 cm, since the top of the guide rod 43 does not have the avoidance groove 431, the compression arm 71 of the retaining spring 7 is compressed, and the distance between the two supporting parts 72 is smaller than the inner hole diameter of the core hammer 41. The core hammer 41 loses support and performs free fall motion. The core hammer 41 falls onto the hammer pad 42, driving the sealing sleeve 2 and the standard penetration head 1 to penetrate into the soil. The sensor on the hammer pad 42 transmits data to the display device 10 through the signal line 513;

[0064] The downward penetration of the mark penetration head 1 and the sealing sleeve 2 will drive the counting rope 61 down together. It should be noted that before the b-section mark on the counting rope 61 drops below the mouth of the penetration hole 8, the number of hammer blows and the hammer force value are not recorded as test data. Only the number of hammer blows in each of the following three sections of the descent process is recorded as the test result.

[0065] Step 5: Disconnect the power supply, lower the sealing sleeve 2 and the standard penetration head 1 and take them out by lifting the cable 51, and the test is finished.

[0066] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0067] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0068] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A standard penetration test device, characterized in that: It includes: A sealing sleeve (2), wherein the bottom of the sealing sleeve (2) is an inverted cone structure; A standard penetration head (1), the standard penetration head (1) being connected to the bottom end of the outside of the sealing sleeve (2); A standard penetration mechanism (4), wherein the standard penetration mechanism (2) is located inside the sealing sleeve (2), and the standard penetration mechanism (2) comprises a penetration hammer (41), a hammer pad (42) connected to a sensor, and a guide rod (43), wherein the hammer pad (42) is installed at the bottom end of the sealing sleeve (2), and the guide rod (43) is located on the axis of the sealing sleeve (2), and the bottom is connected to the hammer pad (42), and the penetration hammer (41) is penetrated on the guide rod (43); A conveying mechanism (3), the conveying mechanism (3) is located inside the sealing sleeve (2) and is used to drive the core-piercing hammer (41) to move upward along the guide rod (43) for a certain distance and then release the core-piercing hammer (41); The guide rod (43) is a hollow structure, and has an avoidance groove (431) extending along its length direction on both sides; The transmission mechanism (3) comprises: A driving gear (31) connected to a driver; A driven gear (32) located below the driving gear (31); A chain (33) connected to the driving gear (31) and the driven gear (32), and the chain (33) penetrates the guide rod (43) along the length direction of the guide rod (43); The clamping spring (7) is arranged on the chain (33), and has two compression arms (71) that can move in two avoidance grooves (431) respectively, and two supporting parts (72) for supporting the core hammer (41), one end of the two compression arms (71) is connected together, and the other end is connected to the two supporting parts (72) respectively.

2. The standard penetration test device according to claim 1, characterized in that: The clamping spring (7) further comprises a spring (73) arranged between the two compression arms (71).

3. The standard penetration test device according to claim 1, characterized in that: When the clamping spring (7) is in a free state, the distance between the two supporting portions (72) is greater than the inner hole diameter of the core hammer (41); When the clamping spring (7) is in a compressed state, the distance between the two supporting portions (72) is smaller than the inner hole diameter of the core hammer (41).

4. The standard penetration test device according to claim 1, characterized in that: It also includes: A lifting mechanism (5), the lifting mechanism (5) comprising a lifting cable (51) and a lifting cable drum (52) for reeling up the lifting cable (51), one end of the lifting cable (51) being connected to the top end of the sealing sleeve (2), and the other end being wound around the lifting cable drum (52).

5. The standard penetration test device according to claim 4, characterized in that: The lifting cable (51) further comprises: A cable (512), one end of the cable (512) is connected to the transmission mechanism (3), and the other end is used to connect to an external power source; A signal line (513), one end of which is connected to a sensor on a hammer pad (42), and the other end of which is connected to a display device (10).

6. The standard penetration test device according to claim 1, characterized in that: It also includes: The counting mechanism (6) comprises a counting rope (61) and a counting rope drum (62). The counting rope (6) is marked with a length, and one end of the counting rope (61) is connected to the sealing sleeve (2), and the other end is connected to the counting rope drum (62).

7. The standard penetration test device according to claim 1, characterized in that: The sealing sleeve (2) is provided with a valve (25) for evacuating the interior of the sealing sleeve (2) to a vacuum.

8. The standard penetration test device according to claim 1, characterized in that: A centering piece (26) for adapting to the diameter of the penetration hole (8) is arranged on the outer side of the sealing sleeve (2).

9. The standard penetration test device according to claim 1, characterized in that: A partition plate (24) is installed above the interior of the sealing sleeve (2), and the top end of the guide rod (43) is fixed on the partition plate (24).

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