A device for lowering a static penetration probe rod and a protective tube, and its use method and application

Abstract

The present invention provides a device for lowering a static penetration probe rod and a protective tube, as well as a method for using and applying the device. After the protective tube sleeve of the device is connected to the protective tube, it is then engaged with the static penetration probe head. A static penetration instrument is used to penetrate the static penetration probe head and the protective tube into the soil section by section to a predetermined depth, while collecting test data. The top of the static penetration probe head is a conical connector for screwing with the static penetration sleeve. The outer wall of the static penetration probe near the top is symmetrically provided with L-shaped teeth for engaging with the teeth in the protective tube sleeve. After the static penetration sleeve is connected to the static penetration rod, the static penetration rod is lowered section by section to the position of the static penetration probe head through the static penetration instrument, and then screwed with the static penetration probe head through the static penetration sleeve. After the connection is completed, the static penetration rod is pressed down to push the probe head to continue penetrating into the soil to collect test data. The device has a simple structure, is novel and unique, and can realize the functions of continuous penetration of the static penetration probe head and sequential lowering of the static penetration rod and the protective tube, thereby saving time and improving work efficiency.

Description

Technical Field

[0001] The present invention belongs to the field of geotechnical engineering testing, and in particular relates to a device for lowering a static penetration probe rod and a protective tube in a static penetration test, and a use method and application thereof. Background Art

[0002] Static penetration test is an important in-situ testing method in geotechnical engineering investigation. It can obtain continuous soil layer test data and can intuitively judge the quality of the soil layer. It is widely used in engineering construction. However, since the static penetration rod is relatively slender, when it penetrates into the soil layer to a large depth, it is easy to cause adverse phenomena such as breakage, tilting, and bending. Therefore, it is necessary to lower a protective pipe in the shallow soil layer to prevent the static penetration rod from experiencing the above phenomena.

[0003] The conventional test method is to first use a static penetration instrument to penetrate the static probe rod connected to the static probe head into the soil to a predetermined depth and then pull it back after the test is completed. Then, use the static penetration instrument method or water flushing method to press the protective tube into the soil to a predetermined depth in turn. Then, use the static penetration instrument to lower the static probe rod connected to the static probe head again to the previously predetermined depth and continue to penetrate for testing.

[0004] The traditional test method of lowering the protective pipe has the following disadvantages: 1. Before lowering the protective pipe, it is necessary to first penetrate the static probe rod to complete the soil layer test at a predetermined depth and pull it back, then lower the protective pipe, and then restart the penetration of the static probe rod for testing. The whole process is cumbersome and takes a long time; 2. When the protective pipe is lowered by the water flushing method, a drilling rig is required, and the process is complicated. In addition, a large amount of mud will be generated during the drilling process, polluting the environment; 3. Since the static probe needs to be pulled back, continuous testing cannot be carried out, and the test cannot be carried out at the same position, which will affect the test accuracy; 4. Since the test data is collected twice, manual splicing is required, which affects the test efficiency.

[0005] In short, the traditional method of lowering the protective pipe in the static penetration test requires testing the soil layer in advance, and then using the static penetration instrument method or the drilling rig water jet method to lower the protective pipe. The process is cumbersome, not only time-consuming and consumes a lot of manpower, but also the mud generated is easy to pollute the environment. In addition, since the static penetration probe is penetrated twice, the continuity and the same position cannot be guaranteed, and the data collected twice need to be manually spliced, which affects the accuracy and efficiency of the test. Summary of the Invention

[0006] The purpose of the present invention is to overcome the above-mentioned problems existing in the prior art, and to provide a device for lowering a static penetration probe rod and a protective tube, and a method for using and applying the device. By adopting a static penetration instrument, the static penetration probe rod and the protective tube can be quickly penetrated, thereby avoiding the tedious process of lowering the protective tube using a drilling rig water flushing method, and not generating mud. The static penetration probe can also be continuously penetrated, while improving the test efficiency and test accuracy, achieving the purpose of being both economical and environmentally friendly.

[0007] In order to achieve the above object, the technical solution provided by the present invention is:

[0008] A device for lowering a static penetration probe rod and a protective tube comprises a protective tube, a protective tube sleeve, latching teeth, a cable, a conical connector, an L-shaped tooth groove, a static penetration probe, a static penetration probe rod, and a static penetration sleeve.

[0009] Specifically, the present invention provides a device for lowering a static penetration probe rod and a protective tube, comprising:

[0010] The protective tube is a steel tube with a threaded opening at the top, which can be connected section by section. The diameter is slightly larger than the static probe rod, and the static probe rod can be sleeved inside to play a protective role.

[0011] A protective tube sleeve, one end of which can be screwed to the protective tube, and the other end is tapered, with teeth welded on the inner side wall, respectively used to engage with the L-shaped tooth groove on the outer wall of the static probe;

[0012] The static probe has a conical connector at its top for screwing onto the static probe sleeve. A symmetrical L-shaped tooth groove is provided on the outer wall near the top of the static probe for engaging with the teeth in the protective tube sleeve.

[0013] The static probe rod is a steel pipe with a threaded end at one end, which can be connected section by section. The threaded end can be screwed to the static probe rod and the static probe sleeve;

[0014] A static probe casing, one end of which can be connected to the static probe rod, and the other end can be screwed to the conical connector of the static probe head, and a penetration test can be carried out after the connection.

[0015] A further preferred solution is that two latching teeth are welded on the inner side wall of the protective tube sleeve, which are respectively used to engage with the L-shaped tooth grooves on the outer wall of the static detection probe.

[0016] Another preferred solution is that two symmetrical L-shaped grooves are formed on the outer wall near the top of the static detection probe for engaging with the teeth in the protective tube sleeve.

[0017] A further preferred solution is that the protective tube is a steel tube with a length of 1 meter, and the static probe rod is a steel tube with a length of 1 meter.

[0018] The present invention further provides a method for using the static penetration probe rod and the protective tube lowering device:

[0019] The protective tube sleeve is embedded with the static detection probe and is screwed into the protective tube; one end of the static detection sleeve is screwed into the static detection rod, and the other end is screwed into the static detection probe; after the protective tube is lowered to a predetermined depth, the static detection rod and the static detection sleeve are lowered into the protective tube and the protective tube sleeve in sequence; after reaching the static detection probe, it is screwed together, and after the connection is completed, the static detection rod is pushed out of the protective tube and the protective tube sleeve to continue penetrating into the soil layer for testing; the cable is pulled out of the static detection probe, and led out of the ground from the static detection rod and the static detection sleeve.

[0020] The present invention further provides an application of the device for lowering the static penetration probe rod and the protective tube, comprising the following steps:

[0021] a. Before starting the test, determine the number of protective tubes and static penetration rods required based on the lowering depth of the protective tube and the static penetration test depth. First, insert the cable into the protective casing and the protective tube in sequence, then insert it into the static penetration casing and the static penetration rod in sequence. Then connect one end of the cable to the static penetration probe and the other end to the data acquisition instrument. Finally, insert the L-shaped tooth groove at the upper end of the static penetration probe into the tooth in the protective tube and tighten it to the right. After fixing the static penetration probe, install it into the static penetration instrument and start the test. Use static force to penetrate the connected static penetration probe, protective tube casing and protective tube into the soil layer, and connect the protective tubes in sequence until the penetration reaches the predetermined depth;

[0022] b. Use the static penetration instrument to lower the static penetration casing, screw on the static penetration rod in turn, and continue to lower it to the tapered connector on the upper end of the static penetration probe. Then start to rotate the static penetration casing, screw the tapered connector on the upper end of the static penetration probe into the static penetration casing, tighten the tapered connector, and then rotate the static penetration rod in the opposite direction to unscrew the embedded static penetration probe from the teeth. At this time, start the static penetration instrument to continue penetration, and penetrate the static penetration probe to the test depth through the static penetration rod. After the test data is collected, first pull back the protective tube, protective casing, and finally pull back the static penetration rod, static penetration casing and static penetration probe in turn, and the test is completed.

[0023] The beneficial effects of the present invention are:

[0024] 1. A static penetration instrument can be used to lower the protective tube and the static penetration rod at the same position; 2. It avoids the need to lower the protective tube by water jet drilling, which simplifies the process, does not generate mud, and is environmentally friendly and economical; 3. It does not need to lower the static penetration rod twice, which saves time and improves work efficiency; 4. The static penetration probe can be penetrated continuously, avoiding the conventional two-time penetration and the need for manual splicing of test data; 5. Since the test position remains unchanged, the probe is penetrated continuously and there is no need for water jet drilling to expand the hole, which reduces interference factors and improves test accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1Schematic diagram of the static penetration probe head, protective tube and protective tube sleeve of the static penetration probe rod and protective tube lowering device of the present invention (left: disassembled state, right: assembled state).

[0026] Figure 2 It is a cross-sectional view of the protective tube sleeve of the static penetration probe rod and the protective tube lowering device of the present invention.

[0027] Figure 3 The present invention is a cross-sectional view of the top of the static penetration probe of the static penetration probe rod and the protective tube lowering device.

[0028] Figure 4 Schematic diagram of the static penetration probe rod and static penetration sleeve of the lowering device of the static penetration probe rod and protection tube of the present invention (left: disassembled state, right: assembled state).

[0029] Figure 5 This is a schematic diagram of the assembly and lowering of the static penetration probe rod, static penetration head and protective tube of the static penetration probe rod and protective tube lowering device of the present invention.

[0030] In the picture:

[0031] 1-Protective tube; 2-Protective tube casing; 3-Gear; 4-Cable; 5-Tapered connector; 6-L-shaped tooth groove; 7-Static probe; 8-Static probe rod; 9-Static probe casing. DETAILED DESCRIPTION

[0032] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more apparent from the following description and claims. It should be noted that the drawings are greatly simplified and not to exact scale, and are intended solely to facilitate and clearly illustrate the embodiments of the present invention.

[0033] Example 1

[0034] like Figure 1 、 Figure 2 and Figure 3 The diagram shows the static probe, protective tube, and protective tube sleeve of the device used in this embodiment. The diagram includes protective tube 1, a standard 1-meter-long steel pipe with a slightly larger diameter than the static probe rod. One end of the protective tube 1 is threaded for connecting to the protective tube sleeve 2. The protective tube sleeve 2 is tapered at one end, with symmetrically welded teeth 3 on its inner wall for engaging with L-shaped grooves 6 on the outer wall of the static probe 7. The static probe 7 has a tapered connector 5 at its top for connecting to the static probe sleeve 9. Two symmetrical L-shaped grooves 6 are cut into the outer wall near the top for engaging with two teeth 3 on the inner wall of the protective tube sleeve 2. A cable 4 is pulled out of the static probe 7 and led out of the protective tube 1 and protective tube sleeve 2 to the ground.

[0035] Figure 4The diagram below shows the static probe rod and static probe sleeve of this embodiment. The static probe rod 8 is a standard 1-meter-long steel pipe with a threaded opening at one end for connecting the static probe rod 8 to the static probe sleeve 9. The static probe sleeve 9 can be screwed onto the static probe rod 8 at one end and onto the tapered connector 5 of the static probe head 7 at the other end.

[0036] Figure 5 It is a schematic diagram of the combination and lowering of the entire static sounding rod, probe and protective tube. The protective tube sleeve 2 is embedded with the static sounding probe 7 and screwed into the protective tube 1; one end of the static sounding sleeve 9 is screwed into the static sounding rod 8, and the other end is screwed into the static sounding probe 7; after the protective tube 1 is lowered to the predetermined depth, the static sounding rod 8 and the static sounding sleeve 9 are lowered into the protective tube 1 and the protective tube sleeve 2 in sequence; after reaching the static sounding probe 7, they are screwed together. After the connection is completed, the static sounding rod 8 is pushed out of the protective tube 1 and the protective tube sleeve 2 to continue penetrating into the soil layer for testing; the cable 4 is pulled out from the static sounding probe 7, and led out of the ground from the static sounding rod 8 and the static sounding sleeve 9.

[0037] Before starting the test, determine the number of protective tubes 1 and static probe rods 8 required according to the lowering depth of the protective tube and the static probe test depth. First, insert the cable 4 into the protective sleeve 2 and the protective tube 1 in turn, and then insert it into the static probe sleeve 9 and the static probe rod 8 in turn. Then connect one end of the cable 4 to the static probe 7, and the other end to the data acquisition instrument. Finally, embed the L-shaped groove 6 at the upper end of the static probe 7 into the tooth 3 in the protective tube 2 and screw it to the right. After fixing the static probe 7, install it into the static penetration instrument to start the test. Use static force to penetrate the connected static probe 7, protective tube sleeve 2 and protective tube 1 into the soil layer, and connect the protective tube 1 in turn until it penetrates to the predetermined depth and stops. Then, use the static penetration instrument to lower the static probe sleeve 9, screw on the static probe rod 8 in turn, and continue to lower it to the conical connector 5 on the upper end of the static probe head 7. Then, start rotating the static probe sleeve 9, screw the conical connector 5 on the upper end of the static probe head 7 into the static probe sleeve 9, tighten the conical connector 5, and then rotate the static probe rod 8 in the opposite direction to unscrew the embedded static probe head 7 from the tooth 3. At this time, start the static penetration instrument to continue penetration, and penetrate the static probe head 7 to the test depth through the static probe rod 8. After the test data is collected, first pull back the protective tube 1, the protective sleeve 2, and finally pull back the static probe rod 8, the static probe sleeve 9 and the static probe head 7 in turn. The entire test work is completed. Repeat the above steps and start another test work.

[0038] The above description is only a description of the preferred embodiments of the present invention and does not limit the scope of the present invention. Any changes and modifications made by ordinary technicians in this field based on the above disclosure shall fall within the scope of protection of the claims.

Claims

1. A method for using a device for lowering a static penetration probe rod and a protective tube, the device comprising: A protective tube (1), a protective tube sleeve (2), a cable (4), a static probe (7), a static probe rod (8), and a static probe sleeve (9); the top of the static probe (7) is provided with a conical connector (5) for being screwed to the static probe sleeve (9); a symmetrical L-shaped tooth groove (6) is provided on the outer wall near the top of the static probe (7) for being engaged with the latching teeth (3) in the protective tube sleeve (2); the protective tube sleeve (2) is engaged with the static probe (7) and is screwed to the protective tube (1); one end of the static probe sleeve (9) is screwed to the static probe rod (8), and the other end is screwed to the conical connector (5) of the static probe (7); The invention is characterized in that it comprises the following steps: embedding the L-shaped tooth groove (6) at the upper end of the static probe (7) into the latch (3) in the protective tube sleeve (2) and screwing it to the right side; after the protective tube (1) is lowered to a predetermined depth, the static probe rod (8) and the static probe sleeve (9) are sequentially lowered into the protective tube (1) and the protective tube sleeve (2); the static probe sleeve (9) is screwed onto the static probe (7); after tightening the conical connector (5), the static probe rod (8) is rotated in the opposite direction to unscrew the embedded static probe (7) from the latch (3), and the static probe rod (8) is pushed out of the protective tube (1) and the protective tube sleeve (2) to continue penetrating into the soil layer for testing; the cable (4) is pulled out from the static probe (7) and led out of the ground from the static probe rod (8) and the static probe sleeve (9).

2. The method for using the device for lowering the static penetration probe and the protective tube according to claim 1, characterized in that: The steps include: a. Before starting the test, determine the number of protective tubes (1) and static probe rods (8) required according to the depth of the protective tube lowering and the static probe test depth. First, insert the cable (4) into the protective tube casing (2) and the protective tube (1) in sequence, then insert it into the static probe casing (9) and the static probe rod (8) in sequence, then connect one end of the cable (4) to the static probe probe (7), and the other end to the data acquisition instrument, finally embed the L-shaped tooth groove (6) at the upper end of the static probe probe (7) into the latch (3) in the protective tube casing (2) and screw it to the right, fix the static probe probe (7) and then install it into the static penetration instrument to start the test, use static force to penetrate the connected static probe probe (7), protective tube casing (2) and protective tube (1) into the soil layer, and connect the protective tube (1) in sequence until the penetration reaches the predetermined depth; b. Use the static penetration instrument to lower the static probe casing (9), screw on the static probe rod (8) in turn, and continue to lower it to the conical connector (5) at the upper end of the static probe head (7). Then start to rotate the static probe casing (9), screw the conical connector (5) at the upper end of the static probe head (7) into the static probe casing (9). After tightening the conical connector (5), rotate the static probe rod (8) in the opposite direction to unscrew the embedded static probe head (7) from the latch (3). At this time, start the static penetration instrument to continue penetration. Use the static probe rod (8) to penetrate the static probe head (7) to the test depth. After the test data is collected, first pull back the protective tube (1), the protective tube casing (2), and finally pull back the static probe rod (8), the static probe casing (9) and the static probe head (7). The test is completed.

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