Soft soil foundation drilling sampling device

Abstract

The invention belongs to the technical field of sampling devices, and particularly discloses a soft soil foundation drilling sampling device which comprises a connecting pipe, a sampling pipe and a cutting ring which are connected end to end from top to bottom. By arranging a separating structure, under the action of the separating structure, gas is injected into a connecting cavity to push a pressed plate to slide along the inner wall of a containing cavity, so that an inserting block is inserted into soft soil on the inner side of a cutting ring, a spring is stretched at the same time, and at the moment, a plugging rod does not shield a through hole any more; therefore, follow-up gas can be injected into the soft soil through the through holes, the upper soft soil and the lower soft soil at the inserting position of the inserting block are separated through gas injection, the sample cutting effect is further achieved, and the problem that after sampling in a traditional mode is conducted, a sample in a sampling pipe is not separated from external soft soil is solved. And when the sampling tube is pulled out under the viscosity of the soft soil, part of the sample is pulled to flow out of the sampling tube, so that the subsequent test is influenced by incomplete sample.

Description

Technical Field

[0001] The invention belongs to the technical field of sampling devices, and specifically discloses a soft soil foundation drilling sampling device. Background Art

[0002] During the expansion project of the Taicang to Changzhou section of the Shanghai-Wuhan Expressway, in order to understand the physical and mechanical properties of the underground soil layer in its natural state, it is usually necessary to take undisturbed soil samples for indoor physical and mechanical index tests. The quality of the undisturbed soil samples is directly related to the accuracy of the experimental results. In the sampling process of soft soil foundation, static pressure method is usually used for sampling. However, after the current sampling device completes the sampling, the soft soil outside the sample tube is not separated from the soft soil inside the sample tube, resulting in the soft soil in the sample tube falling off due to the viscosity of the soft soil during the extraction process, resulting in incomplete samples that affect subsequent tests. Summary of the invention

[0003] In view of this, the purpose of the present invention is to provide a soft soil foundation drilling sampling device to solve the problem that the existing sampling device easily causes incomplete samples.

[0004] To achieve the above purpose, the present invention provides a soft soil foundation drilling sampling device, comprising a connecting pipe, a sampling pipe and a ring knife, wherein the connecting pipe, the sampling pipe and the ring knife are connected end to end from top to bottom, a spiral conveying plate is fixedly connected to the surface of the sampling pipe, a separation structure for separating soil samples is provided on the inner side of the ring knife, and a sampling mechanism is provided inside the sampling pipe; Among them, the separation structure includes a connecting cavity opened inside the ring knife, the inner wall of the connecting cavity is provided with a ring-shaped storage cavity, the inner side of the ring knife is provided with a through hole connected to the storage cavity, the inner wall of the storage cavity is slidably connected with a pressure plate, one side of the pressure plate is fixedly connected with an integrally formed insertion block, the other end of the insertion block extends to the interior of the through hole and is slidably connected with the inner wall of the through hole, and the diameter of the insertion block is smaller than the diameter of the pressure plate.

[0005] In the above technical solution, preferably, a connecting cavity extending to the interior of the insertion block is provided on the side of the pressure plate away from the insertion block, a through hole connected to the inner side of the ring knife is provided inside the connecting cavity, a blocking rod is provided on the inner wall of the through hole, and the other end of the blocking rod is fixedly connected to the inner wall of the connecting cavity.

[0006] In the above technical solution, preferably, the diameter of the blocking rod is smaller than the diameter of the communicating cavity, and a through groove located inside the communicating cavity is formed on the surface of the blocking rod.

[0007] In the above technical solution, preferably, a spring is fixedly connected to the inner wall of the connecting cavity, and the other end of the spring is fixedly connected to the inner wall of the connecting cavity.

[0008] In the above technical solution, preferably, the separation structure also includes a socket opened on the inner top wall of the connecting tube, and a guide tube connected to the socket is arranged inside the connecting tube, and the other end of the guide tube passes through the connecting tube, the sampling tube and the ring knife in sequence and is connected to the connecting cavity.

[0009] In the above technical solution, preferably, the sampling mechanism includes a blocking block slidably connected to the inside of the sampling tube, the top of the blocking block is fixedly connected to a connecting rod, the upper end of the connecting rod sequentially passes through the sampling tube and the connecting tube and is fixedly connected to a slider slidably connected to the inner wall of the connecting tube, an adjustment area is formed between the bottom of the slider and the inner wall of the connecting tube, a connecting channel connected to the adjustment area is opened inside the connecting tube, and an inlet tube connected to the connecting channel is provided on the surface of the connecting tube.

[0010] In the above technical solution, preferably, a shrinkage bag is embedded in the surface of the sampling tube, an inert gas is filled between the top of the sealing block and the interior of the sampling tube, and evenly distributed conduits are provided inside the sampling tube, one end of the conduit is connected to the interior of the sampling tube, and the other end of the conduit is connected to the shrinkage bag.

[0011] In the above technical solution, preferably, an adjusting block is provided on the top of the slider, an adjusting screw is fixedly connected to the bottom of the adjusting block, an adjusting cavity is opened inside the connecting rod, the lower end of the adjusting screw passes through the slider and the connecting rod in sequence and is fixedly connected to a sealing plate which is slidably connected to the inner wall of the adjusting cavity, a guide outlet connected to the adjusting cavity is opened on the surface of the slider, and a mounting tube connected to the guide outlet and matched with the socket is fixedly connected to the top of the slider.

[0012] In the above technical solution, preferably, a cavity communicating with the regulating cavity is opened at the bottom of the blocking block, and a diaphragm is fixedly connected to the inner wall of the cavity.

[0013] Compared with the prior art, the present invention has the following beneficial effects: 1. By setting up a separation structure, under the action of the separation structure, gas can be injected into the interior of the connecting cavity to push the pressure plate to slide along the inner wall of the receiving cavity, so that the insertion block is inserted into the soft soil inside the ring knife and the spring is stretched at the same time. At this time, the blocking rod no longer blocks the through hole, so that the subsequent gas can be injected into the interior of the soft soil through the through hole, and the upper and lower soft soils of the insertion point of the insertion block are separated by gas injection, thereby achieving a cutting effect on the sample, avoiding the situation in which, after sampling in the traditional way, the sample inside the sampling tube is not separated from the external soft soil, and part of the sample is pulled out of the sampling tube when the sampling tube is pulled out due to the viscosity of the soft soil itself, resulting in incomplete samples that affect subsequent tests.

[0014] 2. By setting up a sampling mechanism, waste soil can be discharged from the hole during the drilling process, and the setting of the anti-blocking block can prevent waste soil from entering the interior of the sampling tube during the drilling process. During the sampling process, water is injected into the adjustment area to drive the slider to slide along the inner wall of the connecting tube. At this time, the shrinkage bag bulges to protect the hole wall after the drilling is completed, so as to avoid collapse and produce a large amount of waste soil affecting the subsequent sampling operation.

[0015] 3. By setting up a sampling mechanism, after sampling is completed, the adjusting block can be rotated to drive the adjusting screw to make the sealing plate slide along the inner wall of the adjusting cavity, thereby forming a negative pressure inside the cavity, and then the diaphragm is driven to deform toward the cavity under the action of the negative pressure, and the negative pressure is used to adsorb the sample inside the sampling tube to reduce the possibility of its falling off. At the same time, in the process of moving the sealing plate upward, the air inside the adjusting cavity can be injected into the interior of the jack through the guide port and the installation tube, and then injected into the connecting cavity to cooperate with the insertion block to achieve cutting of the sample. At the same time, the negative pressure adsorption of the insertion block can improve the cutting effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 It is a partial cross-sectional view of the present invention; Figure 3 It is a schematic diagram of the connection between the separation structure and the ring cutter of the present invention; Figure 4 for Figure 3 A magnified view of middle; Figure 5 It is a connection schematic diagram of the sampling mechanism, the connecting pipe and the sampling pipe of the present invention; Figure 6 It is a schematic diagram of the distribution of the adjustment block, the slider, the mounting tube, the connecting rod and the sealing plate of the present invention; Figure 7 It is a schematic diagram of the connection between the jack and the outlet pipe of the present invention.

[0017] In the figure: 1. connecting pipe; 101. sampling tube; 102. ring knife; 103. spiral conveying plate; 2. sampling mechanism; 201. blocking block; 202. diaphragm; 203. connecting rod; 204. contraction bag; 205. slider; 206. catheter; 207. connecting channel; 208. introduction tube; 209. adjusting block; 210. sealing plate; 211. guide outlet; 212. adjusting screw; 213. mounting tube; 3. separation structure; 301. connecting cavity; 302. storage cavity; 303. insertion block; 304. connecting cavity; 305. blocking rod; 306. through groove; 307. spring; 308. pressure plate; 309. jack; 310. guide tube. DETAILED DESCRIPTION

[0018] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0019] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0020] like Figure 1-Figure 7 A soft soil foundation drilling sampling device shown in the figure comprises a connecting pipe 1, a sampling pipe 101 and a ring cutter 102, wherein the connecting pipe 1, the sampling pipe 101 and the ring cutter 102 are connected end to end from top to bottom, a spiral conveying plate 103 is fixedly connected to the surface of the sampling pipe 101, a separation structure 3 for separating soil samples is provided on the inner side of the ring cutter 102, and a sampling mechanism 2 is provided inside the sampling pipe 101; Among them, the separation structure 3 includes a connecting cavity 301 opened inside the ring knife 102, the inner wall of the connecting cavity 301 is provided with a ring-shaped storage cavity 302, the inner side of the ring knife 102 is provided with a through hole connected to the storage cavity 302, the inner wall of the storage cavity 302 is slidably connected with a pressure plate 308, one side of the pressure plate 308 is fixedly connected with an integrally formed insertion block 303, the other end of the insertion block 303 extends to the interior of the through hole and is slidably connected to the inner wall of the through hole, and the diameter of the insertion block 303 is smaller than the diameter of the pressure plate 308.

[0021] The setting of the spiral conveying plate 103 enables the connecting pipe 1 to be connected to the drill pipe by means of a connecting flange, bolts, etc., and the drill pipe is used to drive the connecting pipe 1 to rotate. In this process, the sampling tube 101 and the ring cutter 102 can be driven to rotate synchronously, and then the waste soil generated during the drilling process is lifted to the outside under the action of the spiral conveying plate 103, thereby reducing the influence of the waste soil on the quality of the soil sample during the sampling process; After drilling to the soft soil layer, the connecting pipe 1, the sampling pipe 101 and the ring cutter 102 are driven by the static pressure method to be inserted into the inside of the soft soil foundation to realize the sampling operation of the soft soil foundation; Specifically, the static pressure method uses the feed mechanism of the drilling rig to apply pressure or sets up a ground anchor reaction device to apply pressure to achieve sampling operations on soft soil layers. For soft soil, the static pressure method has the least disturbance when taking soil samples.

[0022] like Figure 1-Figure 7 As shown, a connecting cavity 304 extending to the interior of the insertion block 303 is provided on the side of the pressure plate 308 away from the insertion block 303, and a through hole connected to the inner side of the ring knife 102 is provided inside the connecting cavity 304. A blocking rod 305 is provided on the inner wall of the through hole, and the other end of the blocking rod 305 is fixedly connected to the inner wall of the connecting cavity 301.

[0023] The diameter of the blocking rod 305 is smaller than the diameter of the communicating cavity 304 , and a through groove 306 located inside the communicating cavity 304 is formed on the surface of the blocking rod 305 .

[0024] A spring 307 is fixedly connected to the inner wall of the connecting cavity 304 , and the other end of the spring 307 is fixedly connected to the inner wall of the connecting cavity 301 .

[0025] After sampling is completed, by injecting gas into the interior of the connecting cavity 301, the pressure plate 308 can be pushed to slide along the inner wall of the storage cavity 302. During this process, the blocking rod 305 can serve as a guide for the pressure plate 308 and the insertion block 303, so that the insertion block 303 is inserted into the soft soil on the inner side of the ring knife 102 and the spring 307 is stretched at the same time. At this time, the blocking rod 305 no longer blocks the through hole, so that subsequent gas can be injected into the interior of the soft soil through the through hole. The injection of gas is used to separate the soft soil above and below the insertion point of the insertion block 303, thereby achieving a cutting effect on the sample, avoiding the situation in which, after sampling in the traditional way, the sample inside the sampling tube 101 is not separated from the external soft soil, and part of the sample will be pulled out of the sampling tube 101 when the sampling tube 101 is pulled out due to the viscosity of the soft soil itself, thereby causing the sample to be incomplete and affecting subsequent tests.

[0026] like Figure 1-Figure 7 As shown, the separation structure 3 also includes a socket 309 opened on the inner top wall of the connecting tube 1, and a guide tube 310 connected to the socket 309 is arranged inside the connecting tube 1. The other end of the guide tube 310 passes through the connecting tube 1, the sampling tube 101 and the ring knife 102 in sequence and is connected to the connecting cavity 301.

[0027] By injecting gas into the inside of the insertion hole 309 , the gas can be injected into the inside of the connecting cavity 301 through the outlet tube 310 , and the sample can be cut in cooperation with the insertion block 303 .

[0028] like Figure 1-Figure 7 As shown, the sampling mechanism 2 includes a blocking block 201 slidably connected to the inside of the sampling tube 101, a connecting rod 203 is fixedly connected to the top of the blocking block 201, the upper end of the connecting rod 203 passes through the sampling tube 101 and the connecting tube 1 in sequence and is fixedly connected to a slider 205 slidably connected to the inner wall of the connecting tube 1, an adjustment area is formed between the bottom of the slider 205 and the inner wall of the connecting tube 1, a connecting channel 207 connected to the adjustment area is opened inside the connecting tube 1, and an introduction tube 208 connected to the connecting channel 207 is provided on the surface of the connecting tube 1.

[0029] A shrinkage bag 204 is embedded in the surface of the sampling tube 101, and an inert gas is filled between the top of the sealing block 201 and the interior of the sampling tube 101. The interior of the sampling tube 101 is provided with uniformly distributed conduits 206, one end of the conduit 206 is connected to the interior of the sampling tube 101, and the other end of the conduit 206 is connected to the shrinkage bag 204.

[0030] Water is injected into the interior of the connecting channel 207 through the inlet pipe 208, so that water can be injected into the interior of the adjustment area, so that the lifting slider 205 slides along the inner wall of the connecting pipe 1. In this process, the blocking block 201 can be driven to move synchronously through the connecting rod 203, and then the inert gas is squeezed through the conduit 206 to be injected into the shrinkage bag 204. At this time, the shrinkage bag 204 bulges to protect the hole wall after the drilling is completed, so as to avoid collapse and produce a large amount of waste soil affecting the subsequent sampling operation.

[0031] like Figure 1-Figure 7 As shown, an adjusting block 209 is provided on the top of the slider 205, an adjusting screw 212 is fixedly connected to the bottom of the adjusting block 209, an adjusting cavity is provided inside the connecting rod 203, the lower end of the adjusting screw 212 passes through the slider 205 and the connecting rod 203 in sequence and is fixedly connected to a sealing plate 210 slidably connected to the inner wall of the adjusting cavity, a guide outlet 211 connected to the adjusting cavity is provided on the surface of the slider 205, and a mounting tube 213 connected to the guide outlet 211 and matched with the socket 309 is fixedly connected to the top of the slider 205.

[0032] A cavity communicating with the regulating cavity is formed at the bottom of the blocking block 201 , and a diaphragm 202 is fixedly connected to the inner wall of the cavity.

[0033] Specifically, the adjusting screw 212 is threadedly connected to the inner wall of the slider 205 .

[0034] When the slider 205 moves to the highest point, the mounting tube 213 is inserted into the inside of the socket 309, and the adjusting block 209 passes through the connecting tube 1. The adjusting screw 212 is driven to extend from the inside of the connecting rod 203 by rotating the adjusting block 209. In this process, the sealing plate 210 is driven to slide along the inner wall of the adjusting cavity. At this time, the space below the sealing plate 210 gradually increases to form a negative pressure. Since the cavity is connected to the adjusting cavity, a negative pressure can also be formed inside the cavity, and then the diaphragm 202 is driven to deform toward the cavity under the action of the negative pressure, and the sample inside the sampling tube 101 is adsorbed by the negative pressure to reduce the possibility of its falling off. At the same time, in the process of the sealing plate 210 moving up, the air inside the adjusting cavity can be injected into the inside of the socket 309 through the outlet 211 and the mounting tube 213, and then injected into the connecting cavity 301 to cooperate with the insertion block 303 to achieve cutting of the sample. At the same time, the negative pressure adsorption with the insertion block 303 can improve the cutting effect.

[0035] Working principle: The setting of the spiral conveying plate 103 can connect the connecting pipe 1 to the drill rod through connecting flanges, bolts, etc., and use the drill rod to drive the connecting pipe 1 to rotate. In this process, the sampling tube 101 and the ring cutter 102 can be driven to rotate synchronously, and then the waste soil generated during the drilling process is lifted to the outside under the action of the spiral conveying plate 103, reducing the impact of the waste soil on the quality of the soil sample during the sampling process; after drilling to the soft soil layer, the static pressure method is used to drive the connecting pipe 1, the sampling tube 101 and the ring cutter 102 to be inserted into the soft soil foundation to realize the sampling operation of the soft soil foundation, and water is injected into the interior of the connecting channel 207 through the introduction pipe 208, which can make the water injected into the interior of the adjustment area, so that the lifting slider 205 slides along the inner wall of the connecting pipe 1. In this process, the sealing block 201 can be driven to move synchronously through the connecting rod 203, and then the inert gas is squeezed through the conduit 206 to be injected into the interior of the shrinkage bag 204. At this time, the shrinkage bag 204 bulges to perform wall protection operations on the hole wall after the drilling is completed. In order to avoid a large amount of waste soil from collapsing and affecting subsequent sampling operations, when the slider 205 moves to the highest point, the installation tube 213 is inserted into the inside of the socket 309, and the adjustment block 209 passes through the connecting tube 1. By rotating the adjustment block 209, the adjustment screw 212 is driven to extend from the inside of the connecting rod 203. In this process, the sealing plate 210 is driven to slide along the inner wall of the adjustment cavity. At this time, the space below the sealing plate 210 gradually increases to form a negative pressure, and because the cavity is connected to the adjustment cavity, a negative pressure can be formed inside the cavity, and then the diaphragm 202 is driven to deform toward the cavity under the action of the negative pressure, and the negative pressure is used to adsorb the sample inside the sampling tube 101 to reduce the possibility of its falling off. At the same time, in the process of the sealing plate 210 moving up, the air inside the adjustment cavity can be injected into the inside of the socket 309 through the outlet 211 and the installation tube 213, and then injected into the connecting cavity 301 to cooperate with the insertion block 303 to achieve cutting of the sample. At the same time, the negative pressure adsorption with the insertion block 303 can improve the cutting effect.

[0036] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions only describe the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention. The scope of protection claimed by the present invention is defined by the attached claims and their equivalents.

Claims

1. A soft soil foundation drilling sampling device, comprising a connecting pipe (1), a sampling pipe (101) and a ring cutter (102), characterized in that: The connecting tube (1), the sampling tube (101) and the circular knife (102) are connected end to end from top to bottom; a spiral conveying plate (103) is fixedly connected to the surface of the sampling tube (101); a separation structure (3) for separating soil samples is provided on the inner side of the circular knife (102); and a sampling mechanism (2) is provided inside the sampling tube (101); The separation structure (3) comprises a connecting cavity (301) provided inside the ring knife (102), the inner wall of the connecting cavity (301) is provided with a ring-shaped receiving cavity (302), the inner side of the ring knife (102) is provided with a through hole connected to the receiving cavity (302), the inner wall of the receiving cavity (302) is slidably connected with a pressure plate (308), one side of the pressure plate (308) is fixedly connected with an integrally formed insertion block (303), the other end of the insertion block (303) extends to the interior of the through hole and is slidably connected with the inner wall of the through hole, and the diameter of the insertion block (303) is smaller than the diameter of the pressure plate (308).

2. A soft soil foundation drilling sampling device according to claim 1, characterized in that: A connecting cavity (304) extending into the interior of the insert block (303) is provided on the side of the pressure plate (308) away from the insert block (303); a through hole connected to the inner side of the ring knife (102) is provided inside the connecting cavity (304); a blocking rod (305) is provided on the inner wall of the through hole; the other end of the blocking rod (305) is fixedly connected to the inner wall of the connecting cavity (301).

3. A soft soil foundation drilling sampling device according to claim 2, characterized in that: The diameter of the blocking rod (305) is smaller than the diameter of the communicating cavity (304), and a through groove (306) located inside the communicating cavity (304) is provided on the surface of the blocking rod (305).

4. A soft soil foundation drilling sampling device according to claim 3, characterized in that: A spring (307) is fixedly connected to the inner wall of the connecting cavity (304), and the other end of the spring (307) is fixedly connected to the inner wall of the connecting cavity (301).

5. The soft soil foundation drilling sampling device according to claim 1, characterized in that: The separation structure (3) further comprises a socket (309) formed on the inner top wall of the connecting tube (1); a guide tube (310) connected to the socket (309) is provided inside the connecting tube (1); the other end of the guide tube (310) passes through the connecting tube (1), the sampling tube (101) and the ring knife (102) in sequence and is connected to the connecting cavity (301).

6. A soft soil foundation drilling sampling device according to claim 5, characterized in that: The sampling mechanism (2) comprises a blocking block (201) slidably connected to the inside of the sampling tube (101); a connecting rod (203) is fixedly connected to the top of the blocking block (201); the upper end of the connecting rod (203) passes through the sampling tube (101) and the connecting tube (1) in sequence and is fixedly connected to a sliding block (205) slidably connected to the inner wall of the connecting tube (1); an adjustment zone is formed between the bottom of the sliding block (205) and the inner wall of the connecting tube (1); a connecting channel (207) connected to the adjustment zone is provided inside the connecting tube (1); and an introduction tube (208) connected to the connecting channel (207) is provided on the surface of the connecting tube (1).

7. A soft soil foundation drilling sampling device according to claim 6, characterized in that: A shrinkage capsule (204) is embedded and installed on the surface of the sampling tube (101); an inert gas is filled between the top of the blocking block (201) and the interior of the sampling tube (101); uniformly distributed conduits (206) are arranged inside the sampling tube (101); one end of the conduit (206) is connected to the interior of the sampling tube (101); and the other end of the conduit (206) is connected to the shrinkage capsule (204).

8. The soft soil foundation drilling sampling device according to claim 6, characterized in that: An adjusting block (209) is arranged on the top of the slider (205), an adjusting screw (212) is fixedly connected to the bottom of the adjusting block (209), an adjusting cavity is provided inside the connecting rod (203), the lower end of the adjusting screw (212) passes through the slider (205) and the connecting rod (203) in sequence and is fixedly connected to a sealing plate (210) slidably connected to the inner wall of the adjusting cavity, a guide outlet (211) connected to the adjusting cavity is provided on the surface of the slider (205), and a mounting tube (213) connected to the guide outlet (211) and matched with the socket (309) is fixedly connected to the top of the slider (205).

9. The soft soil foundation drilling sampling device according to claim 6, characterized in that: A cavity communicating with the regulating cavity is provided at the bottom of the blocking block (201), and a diaphragm (202) is fixedly connected to the inner wall of the cavity.

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