A device and method for improving the precision of a water standard penetration test

Abstract

The application relates to the technical field of water standard penetration tests, and relates to a precision improving device for a water standard penetration test, which comprises a sleeve main body, a fixed platform is welded and fixed to the outer surface of the sleeve main body, a first auxiliary fixed tube is welded and fixed to the fixed platform, a first reinforcing plate is welded and fixed between the bottom of the fixed platform and the first auxiliary fixed tube, and a platform mechanism facilitating the water standard penetration test is arranged on the sleeve main body. The precision improving device for the water standard penetration test is characterized in that the detection platform main body and the bottom plate are arranged on the sleeve main body, the second auxiliary fixed tube is welded and fixed between the bottom plate and the sleeve main body to fix the detection platform main body, and the fixed platform arranged below the detection platform main body on the sleeve main body is welded and fixed with the sleeve main body through the first auxiliary fixed tube, so that the sleeve main body is fixed, and the water standard penetration test is conducted through the detection platform main body.

Description

Technical Field

[0001] The invention relates to the technical field of an on-water standard penetration test, in particular to a device for improving the accuracy of an on-water standard penetration test. Background Art

[0002] The Standard Penetration Test (SPT) is a simple, rapid, and economical in-situ dynamic testing technique commonly used in geotechnical engineering. It is particularly useful in determining the mechanical properties of rock and soil, determining foundation bearing capacity, and assessing sand liquefaction. As an in-situ testing method in geotechnical engineering, the SPT can be applied to the quality of underwater sand piles, comprehensively assessing their construction quality and evaluating the effectiveness of composite foundation reinforcement.

[0003] At present, the accuracy of conventional standard penetration test methods cannot be guaranteed at sea. Due to the large deviation caused by the influence of water currents, wind and waves, a large amount of manpower and material resources are often required, resulting in repeated positioning, interruption of test data, etc., which poses a quality risk. Since the distance between the drill rod and the borehole is large, in order to ensure that the drill rod is centered, workers often hold the drill rod with their hands, which poses a safety hazard. Based on the shortcomings of existing technology, the present invention designs an accuracy improvement device for water standard penetration test. Summary of the Invention

[0004] The present invention provides a device for improving the accuracy of an on-water standard penetration test, which has the advantages of high accuracy of on-water standard penetration test data and high test efficiency.

[0005] The present invention provides the following technical solution: a device for improving the accuracy of an above-water standard penetration test, comprising a casing body, a fixing platform welded and fixed to the outer surface of the casing body, a first auxiliary fixing pipe welded and fixed to the fixing platform, a first reinforcing plate welded and fixed between the bottom of the fixing platform and the first auxiliary fixing pipe, a platform mechanism facilitating the above-water standard penetration test provided on the casing body, a positioning mechanism facilitating overall fixation and stability provided on the fixing platform, and a fixing mechanism facilitating positioning of a penetration test rod provided on the top end of the casing body;

[0006] The platform mechanism includes a detection platform body, a base plate, a second auxiliary fixing tube, a first lock buckle, a second lock buckle, a second reinforcement plate and a bottom groove. The detection platform body is arranged on the sleeve body, and the base plate is fixedly connected to the bottom of the detection platform body. The base plate is welded and fixed to the sleeve body. The second auxiliary fixing tube is welded and fixed to the base plate. The first lock buckle is clamped and fixed between the second auxiliary fixing tube and the outer surface of the sleeve body. The second lock buckle is arranged on the other side of the first lock buckle. The second reinforcement plate is welded and fixed between the bottom of the base plate and the second auxiliary fixing tube. The bottom groove is opened through the bottom of the base plate.

[0007] As a preferred technical solution of the present invention, the positioning mechanism includes a top plate, a top ring, a first insertion groove, a rotating groove, a closed ring, a second insertion groove, a rotating ring, a pull rod, a screw groove, a bolt, a first hinge joint, a second hinge joint and an arc-shaped clamping plate. The top plate is arranged at the top end of the sleeve body, the top ring is fixedly connected to the upper surface of the top plate, the first insertion groove is opened on one side of the top plate and the top ring, the rotating groove is opened on the upper surface of the top ring, the closed ring is rotatably connected to the upper surface of the top ring, the second insertion groove is opened on the side wall of the closed ring, the rotating ring is fixedly connected to the lower surface of the closed ring, the pull rod is fixedly connected to the outer wall of the closed ring, the screw groove is opened on both sides of the top plate, the bolt is threadedly inserted into the inside of the screw groove, the first hinge joint is rotatably connected to the inner end of the bolt, the second hinge joint is rotatably hinged on the first hinge joint, and the arc-shaped clamping plate is fixedly connected to one side of the second hinge joint.

[0008] As a preferred technical solution of the present invention, the fixing mechanism includes a hydraulic cylinder, a first connecting head, a second connecting head, a cone plate, a rotating push head, a hinge block and a push arm. The hydraulic cylinder is fixedly connected to the upper surface of the fixed platform, the first connecting head is fixedly connected to the lower surface of the fixed platform, the second connecting head is rotatably hinged to the first connecting head, the cone plate is fixedly connected to one side of the second connecting head, the rotating push head is fixedly connected to the inner wall of the cone plate, the hinge block is fixedly connected to the bottom telescopic end of the hydraulic cylinder, and the push arm is rotatably hinged to the hinge block.

[0009] As a preferred technical solution of the present invention, both ends of the push arm are movably hinged to the hinge block and the rotating push head respectively.

[0010] As a preferred technical solution of the present invention, the bottom output end of the hydraulic cylinder is inserted into the fixed platform through sliding.

[0011] As a preferred technical solution of the present invention, the arc-shaped clamping plate is clamped and fixed on the outer surface of the sleeve body.

[0012] As a preferred technical solution of the present invention, the first insertion groove and the rotating ring can rotate the groove to close or rotate to open.

[0013] As a preferred technical solution of the present invention, the size and shape of the first insertion groove are the same as those of the second insertion groove, and the rotating ring is rotatably connected inside the rotating groove.

[0014] As a preferred technical solution of the present invention, the first locking buckle and the second locking buckle are clamped and fixed on the sleeve body and connected to each other by screws and nuts, and the second auxiliary fixing tube is welded and fixed to the sleeve body.

[0015] As a preferred technical solution of the present invention, a method for using a device for improving the accuracy of an above-water standard penetration test comprises the following steps:

[0016] S1: First, according to the monitoring requirements and the actual situation on site, customize the main body of the testing platform that meets the testing requirements, check the installation holes opened on the bottom plate of the testing platform, check the stability, horizontality and verticality of the testing platform, and check the reliability of the welding of various parts of the testing platform to ensure that it can carry the testing machinery;

[0017] S2: Then place the second auxiliary fixing tube on the mounting hole of the base plate, adjust the position, and install it by welding with an electric welder. Place the fixed platform under the main body of the detection platform and level it with a spirit level. Fix it with an electric welder. Set the mounting holes on the fixed platform corresponding to the base plate, and use a gravity cone to ensure that the mounting holes of the fixed platform and the mounting holes of the main body of the detection platform are on the same vertical line. Weld the first auxiliary fixing tube to the mounting hole of the fixed platform, and weld the first reinforcement plate under the first auxiliary fixing tube.

[0018] S3: Finally, check the horizontality and verticality of the detection platform body and the fixed platform, whether the mounting holes of the detection platform body correspond to each other, whether the welding parts of the detection platform body are firm, whether the connection of the casing body is smooth, whether the first lock and the second lock can fix the casing body, check whether the sizes of the mounting holes, the second auxiliary fixing tube and the first auxiliary fixing tube match the sizes of the casing body, and check the stability of the first auxiliary fixing tube and the second auxiliary fixing tube.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. A device for improving the accuracy of an on-water standard penetration test, which comprises the following steps: welding and fixing a first auxiliary fixing tube and a second auxiliary fixing tube into mounting holes on a fixed platform and a bottom plate respectively; then sleeveing ​​the fixed platform and the first auxiliary fixing tube onto a casing body and welding and fixing them; sleeveing ​​the detection platform body and the second auxiliary fixing tube onto the casing body and fixing them with a first lock buckle and a second lock buckle; after the connection between the fixed platform and the detection platform body and the casing body is completed, the casing body is moved into the penetration test area using a lifting device or a moving device, and the casing body is inserted into the underwater soil until the fixed platform contacts and supports the soil; at this time, the test equipment can be placed on the detection platform body, and the standard penetration test rod is inserted from the top of the casing body into the casing body, and the test can be started using the equipment on the detection platform body. The device is convenient for improving the accuracy of an on-water standard penetration test.

[0021] 2. This device for improving the accuracy of a standard penetration test on water, after the test rod is placed in the casing body, the pull rod is held and rotated to form a closed ring to keep the second insertion groove and the first insertion groove overlapped, and then the top plate is placed on the top of the casing body and the test rod is placed in the first insertion groove and the second insertion groove. At this time, the bolt is tightened to push the arc-shaped clamping plate to move through the first hinge joint and the second hinge joint and fit with the outer wall of the casing body to fix the top plate, and finally the pull rod is held and rotated to form a closed ring to stagger the second insertion groove and the first insertion groove to limit the test rod. This device is convenient for improving the stability of the rod used for the standard penetration test on water.

[0022] 3. This device for improving the accuracy of a standard penetration test on water, after the casing body and the fixed platform move downward and the fixed platform contacts the water bottom, the cone plate is also inserted into the water bottom soil or silt under the push of the fixed platform. At this time, the hydraulic cylinder is started to push the telescopic end to push the hinge block downward, and the downward-moving hinge block pushes the push arm to move downward accordingly. Since the bottom end of the push arm is connected to a rotating push head and a cone plate, and the second connecting head connected to the outer wall of the cone plate is connected to the first connecting head, when the push arm pushes the rotating push head, the bottom end of the push arm will rotate and expand to both ends and push the cone plate to rotate and expand under the limit of the second connecting head and the first connecting head to penetrate into the soil or silt, thereby improving the fixing strength and stability of the fixed platform. This device is convenient for improving the stability of the casing body. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 This is a bottom view of the structure of the casing body of the present invention;

[0025] Figure 3 This is a schematic diagram of the explosion structure of the platform mechanism of the present invention;

[0026] Figure 4 This is a bottom-up structural diagram of the platform mechanism of the present invention;

[0027] Figure 5 This is a schematic diagram of the exploded structure of the positioning mechanism of the present invention;

[0028] Figure 6 This is a schematic cross-sectional view of the fixing mechanism of the present invention;

[0029] Figure 7 It is a bottom view structural diagram of the fixing mechanism of the present invention.

[0030] In the figure: 1. Casing body; 101. Fixing platform; 102. First auxiliary fixing tube; 103. First reinforcing plate; 2. Platform mechanism; 201. Detection platform body; 202. Bottom plate; 203. Second auxiliary fixing tube; 204. First locking buckle; 205. Second locking buckle; 206. Second reinforcing plate; 207. Bottom groove; 3. Positioning mechanism; 301. Top plate; 302. Top ring; 303. First insertion groove; 30 4. Rotating groove; 305. Closed ring; 306. Second insertion groove; 307. Rotating ring; 308. Pull rod; 309. Screw groove; 310. Bolt; 311. First hinge joint; 312. Second hinge joint; 313. Arc clamping plate; 4. Fixing mechanism; 401. Hydraulic cylinder; 402. First connecting head; 403. Second connecting head; 404. Conical plate; 405. Rotating push head; 406. Articulated block; 407. Push arm. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] See also Figure 1-7 A device for improving the accuracy of an on-water standard penetration test comprises a casing body 1, a fixing platform 101 being welded and fixed to the outer surface of the casing body 1, a first auxiliary fixing pipe 102 being welded and fixed to the fixing platform 101, a first reinforcing plate 103 being welded and fixed between the bottom of the fixing platform 101 and the first auxiliary fixing pipe 102, a platform mechanism 2 being provided on the casing body 1 for facilitating the on-water standard penetration test, a positioning mechanism 3 being provided on the fixing platform 101 for improving overall fixation and stability, and a fixing mechanism 4 being provided at the top of the casing body 1 for facilitating positioning of a penetration test rod;

[0033] See also Figure 1-4, platform mechanism 2, platform mechanism 2 includes a detection platform body 201, a bottom plate 202, a second auxiliary fixing tube 203, a first lock buckle 204, a second lock buckle 205, a second reinforcing plate 206 and a bottom groove 207, the detection platform body 201 is set on the casing body 1, the bottom plate 202 is fixedly connected to the bottom of the detection platform body 201, the bottom plate 202 is welded and fixed to the casing body 1, the second auxiliary fixing tube 203 is welded and fixed to the bottom plate 202, the first lock buckle 204 is clamped The second auxiliary fixing tube 203 is fixed between the second auxiliary fixing tube 203 and the outer surface of the sleeve body 1, the second locking buckle 205 is arranged on the other side of the first locking buckle 204, the second reinforcing plate 206 is welded and fixed between the bottom of the bottom plate 202 and the second auxiliary fixing tube 203, and the bottom groove 207 is opened through the bottom of the bottom plate 202. The first locking buckle 204 and the second locking buckle 205 are clamped and fixed on the sleeve body 1, and are connected to each other by screws and nuts. The second auxiliary fixing tube 203 is welded and fixed on the sleeve body 1.

[0034] By arranging the casing body 1, the detection platform body 201 and the fixed platform 101, the detection verticality is improved, the high accuracy of the test data and the high test efficiency are ensured. The casing body 1 is fixed to the detection platform body 201 by the first lock buckle 204 and the second lock buckle 205 to ensure that the casing body 1 does not tilt and fall into the sea due to its own weight. In addition, the casing body 1 can also ensure that the drill rod is centered, and workers do not need to hold the drill rod with their hands during the test, thereby reducing safety hazards.

[0035] See also Figure 5The positioning mechanism 3 includes a top plate 301, a top ring 302, a first insertion groove 303, a rotation groove 304, a closed ring 305, a second insertion groove 306, a rotating ring 307, a pull rod 308, a screw groove 309, a bolt 310, a first hinge head 311, a second hinge head 312 and an arc-shaped clamping plate 313. The top plate 301 is arranged at the top of the sleeve body 1, the top ring 302 is fixedly connected to the upper surface of the top plate 301, the first insertion groove 303 is opened on one side of the top plate 301 and the top ring 302, the rotation groove 304 is opened on the upper surface of the top ring 302, the closed ring 305 is rotatably connected to the upper surface of the top ring 302, the second insertion groove 306 is opened on the side wall of the closed ring 305, and the rotating ring 307 is fixedly connected It is connected to the lower surface of the closed ring 305, the pull rod 308 is fixedly connected to the outer wall of the closed ring 305, the screw grooves 309 are opened on both sides of the top plate 301, the bolts 310 are threadedly inserted into the inside of the screw grooves 309, the first hinged head 311 is rotatably connected to the inner end of the bolt 310, the second hinged head 312 is rotatably hinged on the first hinged head 311, the arc-shaped clamping plate 313 is fixedly connected to one side of the second hinged head 312, the arc-shaped clamping plate 313 is clamped and fixed to the outer surface of the sleeve body 1, the first insertion groove 303 and the swivel 307 can rotate the groove to close or rotate open, the size and shape of the first insertion groove 303 are the same as the second insertion groove 306, and the swivel 307 is rotatably connected to the inside of the rotating groove 304.

[0036] By setting the top plate 301, the top ring 302 and the closed ring 305, the standard water penetration test rod can be limited in position. By setting the first insertion groove 303 and the second insertion groove 306, the standard water penetration test rod can be placed in the top ring 302 and the closed ring 305 and can be rotated and locked to limit the standard water penetration test rod. The top plate 301, the screw groove 309, the bolt 310, the first hinge head 311, the second hinge head 312 and the arc-shaped clamping plate 313 are used to fix the positioning mechanism 3 on the casing body 1 of different sizes.

[0037] See also Figure 6-7 The fixing mechanism 4 includes a hydraulic cylinder 401, a first connecting head 402, a second connecting head 403, a cone plate 404, a rotating pushing head 405, a hinge block 406 and a pushing arm 407. The hydraulic cylinder 401 is fixedly connected to the upper surface of the fixed platform 101, the first connecting head 402 is fixedly connected to the lower surface of the fixed platform 101, the second connecting head 403 is rotatably hinged on the first connecting head 402, the cone plate 404 is fixedly connected to one side of the second connecting head 403, the rotating pushing head 405 is fixedly connected to the inner wall of the cone plate 404, the hinge block 406 is fixedly connected to the bottom telescopic end of the hydraulic cylinder 401, the pushing arm 407 is rotatably hinged on the hinge block 406, and the two ends of the pushing arm 407 are respectively movably hinged on the hinge block 406 and the rotating pushing head 405. The bottom output end of the hydraulic cylinder 401 passes through and is slidably inserted into the fixed platform 101.

[0038] By providing the cone plate 404, after the fixed platform 101 is placed on the riverbed, the cone plate 404 can be moved and inserted into the soil or silt at the riverbed. By providing the hydraulic cylinder 401, the first connecting head 402, the second connecting head 403, the rotating push head 405, the hinge block 406 and the push arm 407, the cone plate 404 can be pushed to expand outward after being inserted into the soil or silt, thereby improving the stability of the fixed platform 101.

[0039] See also Figure 1-7 A method for using a device for improving the accuracy of an on-water standard penetration test comprises the following steps: S1: first, according to the monitoring requirements and the actual situation on site, customize a detection platform body 201 that meets the detection requirements, check the mounting holes opened on the bottom plate 202 on the detection platform body 201, check the stability, horizontality and verticality of the detection platform body 201, and check the reliability of welding of various parts of the detection platform body 201 so that it can carry the detection machinery; S2: then place the second auxiliary fixing pipe 203 on the mounting hole of the bottom plate 202, adjust the position, and use an electric welder to weld and install it, place the fixed platform 101 under the detection platform body 201, and use a spirit level to level it, and weld and fix it with an electric welder, set the mounting holes on the fixed platform 101 corresponding to the bottom plate 202, and use a gravity cone to ensure The mounting hole of the fixed platform 101 and the mounting hole of the detection platform main body 201 are on the same vertical line, the first auxiliary fixing tube 102 is welded to the mounting hole of the fixed platform 101, and the first reinforcing plate 103 is welded below the first auxiliary fixing tube 102; S3: Finally, check the horizontality and verticality of the detection platform main body 201 and the fixed platform 101, whether the mounting holes of the detection platform main body 201 correspond, whether the welding parts of the detection platform main body 201 are firm, whether the connection of the sleeve main body 1 is smooth, whether the first lock buckle 204 and the second lock buckle 205 can fix the sleeve main body 1, check whether the sizes of the mounting hole, the second auxiliary fixing tube 203 and the first auxiliary fixing tube 102 match the size of the sleeve main body 1, and check the stability of the first auxiliary fixing tube 102 and the second auxiliary fixing tube 203.

[0040] Working principle: when a device for improving the accuracy of an on-water standard penetration test is used, in the initial state, the detection platform body 201 and the bottom plate 202 are arranged on the casing body 1, and the second auxiliary fixing pipe 203 is welded and fixed between the bottom plate 202 and the casing body 1 to fix the detection platform body 201. At the same time, the fixed platform 101 arranged on the casing body 1 below the detection platform body 201 is welded and fixed to the casing body 1 using the first auxiliary fixing pipe 102, so as to facilitate the fixing of the casing body 1 while using the detection platform body 201 to perform the on-water standard penetration test. Screw grooves 309 for internal connecting bolts 310 are opened on both sides of the top plate 301 arranged at the top of the casing body 1, and the inner end of the bolt 310 is connected to the casing body 1 through the first hinge joint 311 and the second hinge joint. The head 312 is connected to the arc-shaped clamping plate 313 to facilitate fixing the top plate 301 to the top of the casing body 1 of different sizes. The top surface of the top ring 302 set on the top of the top plate 301 is rotatably connected to the closed ring 305. The first insertion groove 303 and the second insertion groove 306 provided on the top ring 302 and the closed ring 305 are of the same shape to facilitate fixing or removing the test rod. The second connecting head 403 rotatably connected to the first connecting head 402 set at the bottom of the fixed platform 101 is connected to the cone plate 404. The rotating pushing head 405 set on the inner side of the cone plate 404 is connected to the pushing arm 407. The top end of the pushing arm 407 is hinged to the hinge block 406 set at the bottom end of the hydraulic cylinder 401 to control the expansion of the cone plate 404 and improve the fixing strength of the fixed platform 101.

[0041] When it is necessary to improve the accuracy of the standard penetration test on water, first, the first auxiliary fixing tube 102 and the second auxiliary fixing tube 203 are welded and fixed in the mounting holes on the fixed platform 101 and the bottom plate 202 respectively, and then the fixed platform 101 and the first auxiliary fixing tube 102 are sleeved on the casing main body 1 and welded and fixed, and the detection platform main body 201 and the second auxiliary fixing tube 203 are sleeved on the casing main body 1 and fixed with the first locking buckle 204 and the second locking buckle 205. After the connection between the fixed platform 101 and the detection platform main body 201 and the casing main body 1 is completed, the casing main body 1 is moved to the penetration test area by using a lifting device or a mobile device, and the casing main body 1 is inserted into the underwater soil until the fixed platform 101 contacts and supports the soil. At this time, the test equipment can be placed on the detection platform main body 201, and the standard penetration test rod is inserted from the top of the casing main body 1 into the equipment on the detection platform main body 201 to start the test. This device is convenient for improving the accuracy of the standard penetration test on water.

[0042] When it is necessary to improve the working stability of the water standard penetration test rod, first, after the test rod is placed in the casing body 1, the gripping rod 308 rotates the closed ring 305 to keep the second insertion groove 306 and the first insertion groove 303 overlapped, and then the top plate 301 is placed on the top of the casing body 1 and the test rod is inserted into the first insertion groove 303 and the second insertion groove 306. At this time, the bolt 310 is tightened to push the arc clamping plate 313 to move through the first hinge joint 311 and the second hinge joint 312 and fit with the outer wall of the casing body 1 to fix the top plate 301. Finally, the gripping rod 308 rotates the closed ring 305 to stagger the second insertion groove 306 and the first insertion groove 303 to limit the test rod. This device is convenient for improving the stability of the water standard injection test rod.

[0043] When the stability of the casing body 1 needs to be improved, first, after the casing body 1 and the fixed platform 101 move downward and the fixed platform 101 contacts the water bottom, the cone plate 404 is also inserted into the water bottom soil or mud under the push of the fixed platform 101, and the hydraulic cylinder 401 is started to push the telescopic end to push the hinge block 406 downward. The downward hinge block 406 pushes the push arm 407 to move downward accordingly. Since the bottom end of the push arm 407 is connected to the rotating push head 405 and the cone plate 404, and the second connecting head 403 connected to the outer wall of the cone plate 404 is connected to the first connecting head 402, when the push arm 407 pushes the rotating push head 405, the bottom end of the push arm 407 will rotate and expand to both ends and push the cone plate 404 to rotate and expand under the limit of the second connecting head 403 and the first connecting head 402 and penetrate into the soil or mud, thereby improving the fixing strength and stability of the fixed platform 101. This device is convenient for improving the stability of the casing body 1.

[0044] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0045] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A device for improving the accuracy of an above-water standard penetration test, comprising a casing body (1), characterized in that: A fixing platform (101) is welded and fixed to the outer surface of the casing body (1), a first auxiliary fixing tube (102) is welded and fixed to the fixing platform (101), a first reinforcing plate (103) is welded and fixed between the bottom of the fixing platform (101) and the first auxiliary fixing tube (102), a platform mechanism (2) is provided on the casing body (1) for facilitating a standard penetration test on water, a fixing mechanism (4) is provided on the fixing platform (101) for improving overall fixing stability, and a positioning mechanism (3) is provided at the top end of the casing body (1) for facilitating positioning of a penetration test rod; A platform mechanism (2), the platform mechanism (2) comprising a detection platform body (201), a bottom plate (202), a second auxiliary fixing tube (203), a first locking buckle (204), a second locking buckle (205), a second reinforcing plate (206) and a bottom groove (207), the detection platform body (201) being arranged on the sleeve body (1), the bottom plate (202) being fixedly connected to the bottom of the detection platform body (201), and the bottom plate (202) being welded and fixed to the sleeve body (1), The second auxiliary fixing tube (203) is welded and fixed on the bottom plate (202); the first locking buckle (204) is clamped and fixed between the second auxiliary fixing tube (203) and the outer surface of the sleeve body (1); the second locking buckle (205) is arranged on the other side of the first locking buckle (204); the second reinforcing plate (206) is welded and fixed between the bottom of the bottom plate (202) and the second auxiliary fixing tube (203); and the bottom groove (207) is opened through the bottom of the bottom plate (202); The fixing mechanism (4) comprises a hydraulic cylinder (401), a first connecting head (402), a second connecting head (403), a cone plate (404), a rotating push head (405), a hinge block (406) and a push arm (407); the hydraulic cylinder (401) is fixedly connected to the upper surface of the fixed platform (101); the first connecting head (402) is fixedly connected to the lower surface of the fixed platform (101); the second connecting head (403) is rotatably hinged on the first connecting head (402); the cone plate (404) is fixedly connected to one side of the second connecting head (403); the rotating push head (405) is fixedly connected to the inner wall of the cone plate (404); the hinge block (406) is fixedly connected to the bottom telescopic end of the hydraulic cylinder (401); and the push arm (407) is rotatably hinged on the hinge block (406).

2. The device for improving the accuracy of an above-water standard penetration test according to claim 1, characterized in that: The positioning mechanism (3) includes a top plate (301), a top ring (302), a first insertion groove (303), a rotating groove (304), a closed ring (305), a second insertion groove (306), a rotating ring (307), a pull rod (308), a screw groove (309), a bolt (310), a first hinge joint (311), a second hinge joint (312) and an arc-shaped clamping plate (313), wherein the top plate (301) is arranged at the top end of the sleeve body (1), the top ring (302) is fixedly connected to the upper surface of the top plate (301), the first insertion groove (303) is provided on one side of the top plate (301) and the top ring (302), the rotating groove (304) is provided on the upper surface of the top ring (302), and the The closed ring (305) is rotatably connected to the upper surface of the top ring (302), the second insertion groove (306) is provided on the side wall of the closed ring (305), the rotating ring (307) is fixedly connected to the lower surface of the closed ring (305), the pull rod (308) is fixedly connected to the outer wall of the closed ring (305), the screw groove (309) is provided on both sides of the top plate (301), the bolt (310) is threadedly inserted into the inside of the screw groove (309), the first hinge joint (311) is rotatably connected to the inner end of the bolt (310), the second hinge joint (312) is rotatably hinged on the first hinge joint (311), and the arc-shaped clamping plate (313) is fixedly connected to one side of the second hinge joint (312).

3. The device for improving the accuracy of an above-water standard penetration test according to claim 1, characterized in that: The two ends of the push arm (407) are respectively movably hinged on the hinge block (406) and the rotating push head (405).

4. The device for improving the accuracy of an above-water standard penetration test according to claim 1, characterized in that: The bottom output end of the hydraulic cylinder (401) is inserted into the fixed platform (101) through sliding.

5. The device for improving the accuracy of an above-water standard penetration test according to claim 2, characterized in that: The arc-shaped clamping plate (313) is clamped and fixed on the outer surface of the sleeve body (1).

6. The device for improving the accuracy of an above-water standard penetration test according to claim 2, characterized in that: The first insertion groove (303) and the rotating ring (307) can rotate the groove to close or rotate to open.

7. The device for improving the accuracy of an above-water standard penetration test according to claim 2, characterized in that: The size and shape of the first insertion groove (303) are the same as those of the second insertion groove (306), and the rotating ring (307) is rotatably connected to the inside of the rotating groove (304).

8. The device for improving the accuracy of an above-water standard penetration test according to claim 1, characterized in that: The first locking buckle (204) and the second locking buckle (205) are clamped and fixed on the sleeve body (1), and are connected to each other by screws and nuts, and the second auxiliary fixing tube (203) is welded and fixed on the sleeve body (1).

9. A method for using the device for improving the accuracy of an above-water standard penetration test according to claim 1, characterized in that: The following steps are involved: S1: First, according to the monitoring requirements and the actual situation on site, a detection platform body (201) that meets the detection requirements is customized, the installation holes opened on the bottom plate (202) on the detection platform body (201) are checked, the stability, horizontality and verticality of the detection platform body (201) are checked, and the reliability of the welding of various parts of the detection platform body (201) is checked so that it can carry the detection machinery; S2: Then, the second auxiliary fixing tube (203) is placed on the mounting hole of the bottom plate (202), the position is adjusted, and the welding is performed with an electric welder. The fixing platform (101) is placed below the detection platform body (201), and is leveled with a leveler. The fixing platform (101) is fixed with the electric welder. The fixing hole corresponding to the bottom plate (202) is set on the fixing platform (101), and a gravity cone is used to ensure that the mounting hole of the fixing platform (101) and the mounting hole of the detection platform body (201) are on the same vertical line. The first auxiliary fixing tube (102) is welded to the mounting hole of the fixing platform (101), and the first reinforcing plate (103) is welded below the first auxiliary fixing tube (102); S3: Finally, check the horizontality and verticality of the detection platform body (201) and the fixed platform (101), whether the mounting holes of the detection platform body (201) correspond to each other, whether the welding parts of the detection platform body (201) are firm, whether the first lock buckle (204) and the second lock buckle (205) can fix the sleeve body (1), check whether the sizes of the mounting holes, the second auxiliary fixing tube (203) and the first auxiliary fixing tube (102) match the sizes of the sleeve body (1), and check the stability of the first auxiliary fixing tube (102) and the second auxiliary fixing tube (203).

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