CN214096679U

CN214096679U - Multiple pipe geotome

Info

Publication number: CN214096679U
Application number: CN202023350261.6U
Authority: CN
Inventors: 张春; 廖友清; 王万里; 沈鹏; 董万里
Original assignee: Jiangsu Provincial Institute Of Hydrogeology And Engineering Geology
Current assignee: Jiangsu Provincial Institute Of Hydrogeology And Engineering Geology
Priority date: 2020-12-31
Filing date: 2020-12-31
Publication date: 2021-08-31
Anticipated expiration: 2030-12-31

Abstract

The utility model relates to a multiple pipe geotome, including tube head subassembly, body subassembly and drill bit subassembly, the tube head unit mount is served at one of body subassembly, and drill bit unit mount is on the other end of body subassembly, the body subassembly include outside pipe and wear to establish the intraductal inside pipe in outside, the interval has the space between outside pipe and the inside pipe, the inside pipe includes the unit body that a plurality of connect gradually, every unit body all includes a single tube and a coupling, coupling fixed mounting is in one side that the single tube is close to the tube head subassembly. This application has and can install the suitable outside pipe of length and inside pipe according to actual need to the length of reasonable adjustment sampling tube has improved the effect of sample quality.

Description

Multiple pipe geotome

Technical Field

The application relates to the field of geotomes, in particular to a multi-pipe geotome.

Background

At present, domestic marine navigation drilling is developed from offshore to open sea, and open sea engineering geological exploration is the first army to collect first-hand data to the ocean. For the offshore exploration, the exploration is mainly carried out by using a drilling ship or a drilling platform, and the aspects of drilling technology, drilling method and the like are also insufficient during the exploration. Especially, there are still more problems in drilling sampling technology, especially drilling sampling of harder soil layers, have the sampling problem such as full-weathered layer, and receive wave, weather, the depth of water influence greatly.

At present, the multi-tube soil sampler in China is used for sampling, and in order to guarantee sampling accuracy, the sampling tube is often longer, so that a large number of samples can be taken out at one time, and research is facilitated for researchers. However, because the sampling tube is long, for some experiments requiring at least a small amount of samples to be extracted, the phenomena of large sample disturbance and inconvenience in transportation easily occur. It is very inconvenient to use.

In view of the above-mentioned related art, the inventor believes that the current multi-tube soil sampler has a problem that the length of the sampling tube cannot be adjusted reasonably according to the amount of the sample to be extracted.

SUMMERY OF THE UTILITY MODEL

In order to improve present multiple pipe geotome and to have the problem that can not come reasonable adjustment sampling tube's length according to the sample size that needs extracted, this application provides a multiple pipe geotome.

The application provides a multiple pipe geotome adopts following technical scheme:

the utility model provides a multiple pipe geotome, includes tube head subassembly, body subassembly and drill bit subassembly, and the tube head unit mount is served at one of body subassembly, and drill bit unit mount is on the other end of body subassembly, the body subassembly include outside pipe and wear to establish the intraductal inside pipe of outside, there is the space at the interval between outside pipe and the inside pipe, the inside pipe includes the unit body that a plurality of roots connect gradually, every unit body all includes a single tube and a coupling, coupling fixed mounting is in one side that the single tube is close to the tube head subassembly.

Through adopting above-mentioned technical scheme, the inside pipe comprises the unit body that a plurality of connect gradually, according to the quantity of the unit body of connecting to the length of adjustment inside pipe. And the outer pipe can be conveniently disassembled and replaced because the outer pipe is arranged on the outer side of the inner pipe. The outer tube and the inner tube with proper lengths can be arranged according to actual requirements, so that the length of the sampling tube can be adjusted reasonably. The phenomenon that the sample is disturbed greatly and is not beneficial to carrying because the difference between the collection depth and the length of the sampling tube is large is not easy to appear in the sampling process, and the use is more convenient.

Optionally, the inner pipe further comprises a waste soil pipe, and the waste soil pipe is arranged on one side of the unit pipe body close to the pipe head assembly.

Through adopting above-mentioned technical scheme, when the sampling, it is great that the partial soil difference that is located on the soil layer top surface is not tried as the sample. Through being provided with the waste soil pipe, can take out the partial soil of soil layer top surface department in the lump in the time of the sampling, later take off the waste soil pipe, only detect the sample in the inner tube, improved the precision that detects the structure.

Optionally, the tube head assembly includes an outer tube bag and an inner tube bag, the outer tube is fixedly mounted on the outer tube bag, an axis of the outer tube is a reference axis, the inner tube bag is rotatably mounted on the outer tube bag and located inside the outer tube, the inner tube is fixedly mounted on one side of the inner tube bag far away from the outer tube bag, and both the rotation axis of the inner tube bag and the axis of the inner tube are collinear with the reference axis; drill bit subassembly fixed mounting is on outside pipe, and the pipe boot is installed to the one end that the tube head subassembly was kept away from to inside pipe, and the one end that the outer tube brain bag was kept away from to the pipe boot is located the one end that the outer tube brain bag was kept away from to the drill bit subassembly.

By adopting the technical scheme, when the motor drives the outer tube cerebral bag to rotate, the motor drives the outer tube to rotate together. When one needs to drill, the inner pipe is firstly contacted with the soil layer because the pipe boot is far away from the outer pipe head bag compared with the drill bit assembly. At the moment, the inner tube cerebral sack is rotatably arranged on the outer tube cerebral sack, the outer tube cerebral sack rotates, and the inner tube cerebral sack does not rotate because of being contacted with the ground. The outer pipe rotates and moves axially, the inner pipe only moves axially, the resistance of the outer pipe entering the soil is reduced, the disturbance of the sample is reduced by the inner pipe, and the quality of the soil sample is effectively improved.

Optionally, a transmission guide hole is formed in the side surface, close to the inner tube brain bag, of the outer tube brain bag, a transmission guide shaft penetrates through the transmission guide hole, the axis of the transmission guide shaft is collinear with the reference line, one end of the transmission guide shaft is located outside the transmission guide hole, and the inner tube brain bag is rotatably mounted at the other end of the transmission guide shaft; the pressure regulating slide groove is formed in the inner side wall of the transmission guide hole and is parallel to the reference shaft, the pressure regulating slide block is fixedly mounted on the transmission guide shaft and is slidably mounted in the pressure regulating slide groove, the pressure regulating spring is mounted on the pressure regulating slide block, and the other end of the pressure regulating spring is connected with one end, far away from the inner tube brain bag, of the pressure regulating slide groove.

Through adopting above-mentioned technical scheme, when boring the soil layer of getting, the pressure regulating spring that sets up in the pressure regulating spout can play the effect of buffering. When the soil-entering resistance of the inner pipe is large, the soil-entering resistance is buffered by the pressure regulating spring, so that the purpose of taking a high-quality soil sample is achieved.

Optionally, the pressure regulating spout one end department of keeping away from the inner tube brain bag install the pressure regulating screw, the one end that the pressure regulating screw is close to the inner tube brain bag is held for adjusting, the regulation end of pressure regulating screw can remove along the pressure regulating spout to keep the rigidity when the stop motion, when the pressure regulating slider removed to the one side of keeping away from the inner tube brain bag along the pressure regulating spout, the regulation end butt of pressure regulating slider and pressure regulating screw.

Through adopting above-mentioned technical scheme, the pressure regulating screw is installed in the pressure regulating spout, and can remove, and the pressure regulating slider only can remove between the one end that the pressure regulating spout is close to the inner tube head bag and the regulation end when removing. The maximum thrust of the pressure regulating slide block is regulated by the pressure regulating spring by regulating the position of the pressure regulating screw. Can adjust according to the soft or hard degree of soil layer, when boring the soil layer of getting, be difficult for appearing the pressure regulating spring and excessively promote the inner tube and remove, reduce sampling quality's phenomenon.

Optionally, a mounting groove is formed in the side surface of the inner tube brain bag, which is close to the outer tube brain bag, a positioning shaft sleeve is detachably mounted on the inner side wall of the mounting groove, one end of the transmission guide shaft penetrates through the positioning shaft sleeve, and planar thrust bearings are fixedly mounted on both the side surface of the positioning shaft sleeve, which is close to the outer tube brain bag, and the side surface of the positioning shaft sleeve, which is far away from the outer tube brain bag, and are fixedly connected with the transmission guide shaft; the opening part at the mounting groove is installed skeleton water seal circle, and the transmission guiding axle wears to establish in skeleton water seal circle and with the inside wall butt of skeleton water seal circle.

Through adopting above-mentioned technical scheme, the transmission guiding axle wears to be established at location axle sleeve inboard to connect through two plane thrust bearing, in the sample, plane thrust bearing can bear bigger thrust, is difficult to damage, and the structure is more stable. And the framework water seal ring can seal the opening of the mounting groove to protect the plane thrust bearing arranged in the mounting groove.

Optionally, a circulating water injection groove is formed in the end face, away from the inner tube brain bag, of the transmission guide shaft, a circulating water through hole is formed in the inner side wall of the circulating water injection groove, and the circulating water through hole is located on one side, close to the outer tube brain bag, of the inner tube brain bag.

By adopting the technical scheme, when the multi-pipe soil sampler is vertically placed downwards and cannot go deep into a preset sampling point, hole cleaning operation is required. Water is pumped by the water pump to be injected into the circulating water tank, then flows into the annular gap between the inner pipe and the outer pipe through the circulating water through hole, and finally is discharged to the drill bit assembly, so that the drill bit assembly is cleaned. When the cleaning is finished, the pump is stopped, and the sampling can be carried out again.

Optionally, a drainage groove is formed in the side face, close to the inner pipe, of the inner pipe head bag, the opening size of the drainage groove is smaller than the size of the cross section, away from the opening end, of the drainage groove, a drainage block is installed in the drainage groove and smaller than the drainage groove, the cross section of the drainage block is larger than the size of the opening of the drainage groove, a drainage through hole is formed in the inner side wall of the drainage groove, and when the drainage block moves to a position where a gap is formed between the drainage block and the opening of the drainage groove, a gap is formed between the drainage block and the drainage through hole.

Through adopting above-mentioned technical scheme, when taking a sample, during soil sample gets into the inner tube, the liquid level in the inner tube risees gradually, when rising to the water drainage tank in, can jack-up drainage piece to expose the drainage through-hole, make water discharge in the drainage through-hole. After the soil sample is well sampled, the drainage block falls down and seals the drainage groove, and the soil sample is not easy to slide down from the inner pipe when the drill is lifted under the action of the atmospheric pressure, so that the sampling quality is improved.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the outer pipe and the inner pipe with proper lengths can be installed according to actual needs, so that the length of the sampling pipe is reasonably adjusted, and the sampling quality is improved;

2. after the soil sample is well taken, the drainage block falls down and seals the drainage groove, and the soil sample is not easy to slide down from the inner pipe when the drill is lifted under the action of the atmospheric pressure.

Drawings

Fig. 1 is a schematic structural diagram of the present embodiment.

Fig. 2 is a cross-sectional view of the entire multi-tube geotome.

Fig. 3 is a schematic structural view of a portion a in fig. 2.

Description of reference numerals: 1. a tube head assembly; 2. an outer cerebral bag; 21. a drive guide shaft; 211. a pressure regulating slider; 22. a drive guide hole; 221. a pressure regulating chute; 222. a threaded chute; 23. a pressure regulating screw; 231. a screw through hole; 24. a pressure regulating spring; 3. an inner tube brain bag; 31. mounting grooves; 311. positioning holes; 312. positioning the shaft sleeve; 313. positioning pins; 32. a planar thrust bearing; 33. a ball bearing; 34. a framework water seal ring; 4. a circulating water injection tank; 41. a circulating water through hole; 5. a water discharge tank; 51. a gland; 52. pressing the hole; 53. a valve ball; 54. a drain through hole; 6. a tube body assembly; 61. an outer tube; 62. an inner tube; 621. a waste soil pipe; 622. a single tube; 623. a coupling; 7. a drill bit assembly; 71. an auxiliary drill bit; 8. a pipe boot.

Detailed Description

The present application is described in further detail below with reference to figures 1-3.

The embodiment of the application discloses multiple pipe geotome. Referring to fig. 1, the multi-pipe soil sampler is sequentially divided into a pipe head assembly 1, a pipe body assembly 6 and a drill bit assembly 7 from one end to the other end.

Referring to fig. 2 and 3, the tube head assembly 1 includes an outer tube head 2, an inner tube head 3, and a transmission guide shaft 21. Wherein, one side of the outer tube brain bag 2 close to the inner tube brain bag 3 is provided with a transmission guide hole 22. The pressure regulating chute 221 and the threaded chute 222 are arranged on the inner side wall of the transmission guide hole 22, the cross sections of the pressure regulating chute 221 and the threaded chute 222 are both in a circular ring shape, the pressure regulating chute 221 is located in the middle of the transmission guide hole 22, the threaded chute 222 is adjacent to the pressure regulating chute 221 in position and located on one side, away from the inner tube brain bag 3, of the pressure regulating chute 221, and the outer diameter of the threaded chute 222 is smaller than that of the pressure regulating chute 221. The pressure regulating screw 23 is installed in the threaded sliding groove 222 through threads, the pressure regulating screw 23 comprises a cylindrical rod body part and a head body part, the rod body part is in threaded fit with the threaded sliding groove 222, and the diameter of the head body part is larger than that of the rod body part and is embedded in the pressure regulating sliding groove 221.

Referring to fig. 2 and 3, a screw through hole 231 is formed on an end surface of the pressure adjusting screw 23, and one end of the transmission guide shaft 21 is inserted into the transmission guide hole 22 and also inserted through the screw through hole 231. An annular pressure regulating slider 211 is integrally formed on the outer side surface of the transmission guide shaft 21, and the pressure regulating slider 211 slides and is embedded in the pressure regulating chute 221. A pressure regulating spring 24 is installed in the transmission guide hole 22, one end of the pressure regulating spring 24 is abutted against the pressure regulating slider 211, and the other end of the pressure regulating spring 24 is fixedly installed on one side of the threaded chute 222, which is far away from the pressure regulating chute 221. And sealing rings are arranged on the outer side surfaces of the transmission guide shaft 21 and the pressure regulating slide block 211, and the sealing rings on the transmission guide shaft 21 are positioned on one side of the regulating screw far away from the pressure regulating slide block 211.

Referring to fig. 2 and 3, an installation groove 31 is formed in the end surface of the inner tube bag 3 close to the outer tube bag 2, a circle of positioning holes 311 is formed in the inner side wall of the installation groove 31, and six positioning holes 311 are arranged at equal intervals. An annular positioning sleeve 312 is mounted in the mounting groove 31, and the positioning sleeve 312 is adjacent to the positioning hole 311. The positioning hole 311 is provided with a positioning pin 313 in a penetrating way, and the positioning pin 313 is fixedly connected with the positioning shaft sleeve 312. The side of the positioning shaft sleeve 312 far away from the outer tube head bag 2 and the side close to the outer tube head bag 2 are both provided with a plane thrust bearing 32, a ball bearing 33 is fixedly arranged at the notch of the mounting groove 31, and a skeleton water seal ring 34 made of rubber is further adhered to the side of the ball bearing 33 far away from the positioning shaft sleeve 312. The transmission guide shaft 21 simultaneously penetrates through the framework water seal ring 34, the ball bearing 33, the plane thrust bearing 32 and the positioning shaft sleeve 312, and the transmission guide shaft 21 is fixedly connected with the ball bearing 33 and the plane thrust bearing 32.

Referring to fig. 2 and 3, a circulating water injection groove 4 is formed in the end face of the transmission guide shaft 21 away from the inner tube brain bag 3, the bottom end of the circulating water injection groove 4 is located at a position between the outer tube brain bag 2 and the inner tube brain bag 3, and a circulating water through hole 41 is formed in the inner side wall of the circulating water injection groove 4. The side surface of the inner tube head bag 3, which is far away from the outer tube head bag 2, is provided with a drainage groove 5, the opening of the drainage groove 5 is fixedly provided with a gland 51, and the edge of the gland 51 is hermetically connected with the inner side wall of the drainage groove 5. The center of the pressing cover 51 is provided with a pressing hole 52, the pressing hole 52 is an actual opening of the drainage channel 5, the side surface of the pressing cover 51 close to the drainage channel 5 is an inward concave conical surface, and the position where the pressing hole 52 is arranged is at the tip of the conical surface. A valve ball 53 as a drainage block is installed in the drainage channel 5, the valve ball 53 is smaller than the drainage channel 5 and larger than the diameter of the pressure hole 52, a drainage through hole 54 is formed in the inner side wall of the drainage channel 5, the drainage through hole 54 is obliquely arranged, and one end of the drainage through hole 54, which is far away from the valve ball 53, is inclined toward one side of the outer tube head bag 2. When the valve ball 53 moves to a position where it does not cover the pressure hole 52, the valve ball 53 is also spaced apart from the drain through hole 54, and the valve ball 53 can stably move to a position where it covers the pressure hole 52 by gravity.

Referring to fig. 2 and 3, the pipe body assembly 6 includes an outer pipe 61 and an inner pipe 62. The outer tube 61 is detachably arranged on one side of the outer tube cerebral bag 2 close to the inner tube cerebral bag 3, and the inner tube cerebral bag 3 penetrates through the inner side of the outer tube 61. The inner tube 62 is detachably mounted on one side of the inner tube head 3 away from the outer tube head 2, and the outer diameter of the inner tube 62 is slightly smaller than the inner diameter of the outer tube 61. The axes of the outer tube 61, the inner tube 62 and the drive guide shaft 21 are collinear. The inner pipe 62 includes a waste pipe 621 and at least one unit pipe body including a single pipe 622 and a coupling 623. The waste soil pipe 621 is fixedly installed on the inner pipe head bag 3, and the coupling 623 of the unit pipe body is fixedly installed on one side of the single pipe 622 close to the pipe head assembly 1. The coupling 623 of the unit pipe body adjacent to the inner pipe brain bag 3 is fixedly connected with the waste soil pipe 621, and the couplings 623 of other unit pipe bodies are connected with the single pipe 622 of the previous unit pipe body.

Referring to fig. 2 and 3, the drill bit assembly 7 comprises an auxiliary drill bit 71, the auxiliary drill bit 71 is mounted on the end of the outer tube, a tube shoe 8 is further mounted on the end of the inner tube, and the end of the tube shoe 8 far away from the outer tube cerebral sack 2 is located at the end of the drill bit assembly 7 far away from the outer tube cerebral sack 2.

The implementation principle of the multiple-pipe soil sampler in the embodiment of the application is as follows: the inner pipe is composed of a waste soil pipe 621 and a plurality of unit pipe bodies connected in sequence, and the length of the inner pipe 62 is adjusted according to the number of the connected unit pipe bodies. The outer tube 61 is disposed outside the inner tube 62 and can be easily removed and replaced. The outer tube 61 and the inner tube 62 can be installed in proper lengths according to actual needs, so that the length of the sampling tube can be adjusted reasonably. When sampling, earlier with the one end and the soil layer butt of pipe boot 8, later drive outside pipe 61 rotates, outer tube rotation and axial motion, and the inner tube is only axial motion, and the outer tube reduces the resistance of ingressing, and the inner tube reduces the disturbance of sample. The pressure adjusting spring 24 provided in the pressure adjusting chute 221 can play a role of buffering. When the inner pipe resistance to soil is big, cushion the resistance to soil through pressure regulating spring 24 to effectively improved the quality of taking the soil sample. And through the position of adjusting pressure screw 23, can adjust the biggest thrust of pressure regulating spring 24 to pressure regulating slider 211, when boring the soil layer, be difficult for appearing pressure regulating spring 24 and excessively promote the inner tube and remove, reduce the phenomenon of sampling quality.

In the sampling process, if the multi-pipe soil sampler is hung downwards and cannot reach a preset sampling point, hole cleaning operation is required. The water is pumped into the circulation water tank by the water pump, then flows into the annular gap between the inner pipe 62 and the outer pipe 61 through the circulation water through holes 41, and finally is discharged to the drill bit assembly 7, thereby cleaning the drill bit assembly 7. When the cleaning is finished, the pump is stopped, and the sampling can be carried out again. When sampling is performed, the soil sample enters the inner pipe 62, the liquid level in the inner pipe 62 gradually rises, and when the soil sample rises into the drainage groove 5, the drainage block is pushed up, the drainage through hole 54 is exposed, and water is drained from the drainage through hole 54. After the soil sample is well taken, the drainage block falls down and seals the drainage groove 5, and the soil sample is not easy to slide from the inner pipe 62 during drilling under the action of atmospheric pressure, so that the sampling quality is improved.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. The utility model provides a multiple pipe geotome, includes tube head subassembly (1), body subassembly (6) and drill bit subassembly (7), and one of body subassembly (6) is installed in tube head subassembly (1) is served, and install on the other end of body subassembly (6) drill bit subassembly (7), its characterized in that: body subassembly (6) including outside pipe (61) and wear to establish inside pipe (62) in outside pipe (61), the interval has the space between outside pipe (61) and inside pipe (62), inside pipe (62) include the unit body that a plurality of connect gradually, every unit body all includes a single tube (622) and a coupling (623), coupling (623) fixed mounting is in one side that single tube (622) are close to tube head subassembly (1).

2. The multi-tube geotome of claim 1 wherein: the inner pipe (62) further comprises a waste soil pipe (621), and the waste soil pipe (621) is arranged on one side, close to the pipe head assembly (1), of the unit pipe body.

3. The multi-tube geotome of claim 1 wherein: the pipe head assembly (1) comprises an outer pipe brain bag (2) and an inner pipe brain bag (3), an outer pipe (61) is fixedly installed on the outer pipe brain bag (2), the axis of the outer pipe (61) is a reference shaft, the inner pipe brain bag (3) is rotatably installed on the outer pipe brain bag (2) and is positioned on the inner side of the outer pipe (61), an inner pipe (62) is fixedly installed on one side, far away from the outer pipe brain bag (2), of the inner pipe brain bag (3), and the rotating axis of the inner pipe brain bag (3) and the axis of the inner pipe (62) are collinear with the reference shaft; drill bit subassembly (7) fixed mounting is on outside pipe (61), installs pipe shoe (8) in the one end that tube head subassembly (1) was kept away from in inside pipe (62), and pipe shoe (8) keep away from the one end of outer tube head (2) and be located drill bit subassembly (7) and keep away from the one end of outer tube head (2).

4. The multi-tube geotome of claim 3 wherein: a transmission guide hole (22) is formed in the side face, close to the inner tube brain bag (3), of the outer tube brain bag (2), a transmission guide shaft (21) penetrates through the transmission guide hole (22), the axis of the transmission guide shaft (21) is collinear with the reference line, one end of the transmission guide shaft (21) is located on the outer side of the transmission guide hole (22), and the inner tube brain bag (3) is rotatably installed at the other end of the transmission guide shaft (21); pressure regulating sliding grooves (221) are formed in the inner side wall of the transmission guide hole (22), the pressure regulating sliding grooves (221) are parallel to the reference shaft, pressure regulating sliding blocks (211) are fixedly mounted on the transmission guide shaft (21), the pressure regulating sliding blocks (211) are slidably mounted in the pressure regulating sliding grooves (221), pressure regulating springs (24) are mounted on the pressure regulating sliding blocks (211), and the other ends of the pressure regulating springs (24) are connected with one ends, far away from the inner tube brain bags (3), of the pressure regulating sliding grooves (221).

5. The multi-tube geotome of claim 4 wherein: pressure regulating spout (221) keep away from the one end department of inner tube brain bag (3) and install pressure regulating screw (23), the one end that pressure regulating screw (23) are close to inner tube brain bag (3) is held for adjusting, the regulation end of pressure regulating screw (23) can remove along pressure regulating spout (221), and keep the rigidity when stop moving, pressure regulating slider (211) remove to the one side of keeping away from inner tube brain bag (3) along pressure regulating spout (221) when, the regulation end butt of pressure regulating slider (211) and pressure regulating screw (23).

6. The multi-tube geotome of claim 4 wherein: the side, close to the outer tube head bag (2), of the inner tube head bag (3) is provided with a mounting groove (31), the inner side wall of the mounting groove (31) is detachably provided with a positioning shaft sleeve (312), one end of a transmission guide shaft (21) penetrates through the positioning shaft sleeve (312), the side, close to the outer tube head bag (2), of the positioning shaft sleeve (312) and the side, far away from the outer tube head bag (2) are fixedly provided with a plane thrust bearing (32), and the plane thrust bearing (32) is fixedly connected with the transmission guide shaft (21) at the same time; a framework water seal ring (34) is installed at the opening of the installation groove (31), and the transmission guide shaft (21) penetrates through the framework water seal ring (34) and is abutted to the inner side wall of the framework water seal ring (34).

7. The multi-tube geotome of claim 4 wherein: the end face, far away from the inner tube brain bag (3), of the transmission guide shaft (21) is provided with a circulating water injection groove (4), the inner side wall of the circulating water injection groove (4) is provided with a circulating water through hole (41), and the circulating water through hole (41) is located on one side, close to the outer tube brain bag (2), of the inner tube brain bag (3).

8. The multi-tube geotome of claim 3 wherein: inner tube brain bag (3) be close to on the side of inner tube (62) seted up water drainage tank (5), the opening size of water drainage tank (5) is less than the cross section size that water drainage tank (5) kept away from opening one end, install the drainage piece in water drainage tank (5), the drainage piece is less than water drainage tank (5), and the cross section of drainage piece is greater than water drainage tank (5) open-ended size, drainage through-hole (54) have been seted up on the inside wall of water drainage tank (5), when the drainage piece remove to and have the position of space between water drainage tank (5) the opening, also the space has at a distance between drainage piece and drainage through-hole (54).