A shield tunnel differential stratum detection device

Abstract

The application discloses a shield tunnel differential stratum detection equipment, which comprises an outer pipe, a drill bit installed at the lower end of the outer pipe, an inner pipe rotatably installed in the outer pipe, the central axis of the inner pipe coinciding with the central axis of the outer pipe, a sampling pipe threadedly connected to the lower end of the inner pipe, a rubber sleeve wound on the sampling pipe, a tightening belt inwardly gathered at the lower end of the rubber sleeve, and an expander arranged at the lower end of the pipe body to release the rubber sleeve. The outer pipe and the inner pipe are synchronously lowered, the sampling column protrudes into the pipe body, the disc always protects the upper end of the sampling column, the rubber sleeve is gradually unfolded outside the sampling column on the upper side of the disc, the rubber sleeve is wrapped outside the sampling column and does not compress and vertically rub the sampling column, so that the disturbance influence on the sampling of soft soil is smaller.

Description

Technical Field

[0001] The present invention relates to the technical field of geological sampling, and in particular to a shield tunnel differentiated stratum detection device. Background Art

[0002] In the process of geological exploration, tunnel excavation and oil field exploration, rock and soil layer samples are the basis of geological structure analysis. By observing and studying the rock and soil layer samples, we can directly understand the rock type of the mountain, so as to evaluate the strength of the mountain and the subsequent possible geological disasters. The coring device is a kind of equipment used in geological exploration and geotechnical engineering. The coring device can obtain rock and soil layer samples from underground or inside the mountain.

[0003] The single-action double-tube coring device with patent publication number CN117646611B, when encountering a situation where the rock formations are alternating between hard and soft, the harder and softer rock cores are both wrapped and pulled by an annular flexible telescopic net. Differentiated strata include not only harder and softer rock cores, but also softer clay and underground cave soil. This type of soil is wrapped and squeezed by the annular flexible telescopic net, which will affect the performance of the soft soil removed, cause too much disturbance to the sample, and affect subsequent analysis. Summary of the Invention

[0004] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a shield tunnel differentiated stratum detection device.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A shield tunnel differentiated stratum detection device comprises an outer tube, the outer tube being a hollow cylindrical tubular structure, and a drill bit being installed at the lower end of the outer tube;

[0007] A driving device, the driving device is used to drive the outer tube to rotate along its central axis;

[0008] an inner tube rotatably mounted in the outer tube, wherein the central axis of the inner tube coincides with the central axis of the outer tube;

[0009] The lower end of the inner tube is threadedly connected to the sampling tube;

[0010] The sampling tube includes a tube body, a baffle fixedly connected to the upper end of the inner wall of the tube body, a disc slidably connected to the tube body, a tension spring fixedly connected between the disc and the baffle, an annular groove is provided on the outer wall of the tube body, at least two limiting posts are slidably connected in an annular array in the annular groove, limiting holes are provided on the outer side of the disc, the limiting holes are adapted to the limiting posts, a supporting spring is provided between the limiting posts and the side wall of the annular groove, and a limiting belt is provided in an annular manner inside the annular groove;

[0011] A rolled-up rubber sleeve is arranged at the bottom of the disc, a tightening belt that gathers inwards is arranged at the lower end of the rubber sleeve, and an unfolder for releasing the rubber sleeve is arranged at the lower end of the tube body.

[0012] Preferably, the deployer includes a support ring, the lower end of the tube body is fixedly connected to the support ring, the inner wall of the tube body is fixedly connected to the retaining ring, a recessed ring groove is provided on the outer side of the support ring, the retaining ring extends into the recessed ring groove and forms an annular channel.

[0013] Preferably, a protruding ring is provided on the upper outer side of the support ring.

[0014] Preferably, the protruding ring is provided with an annular pressing groove, and a plurality of pressing spring pieces are fixedly connected in an annular row on the upper side of the retaining ring, and the pressing spring pieces are in a downwardly concave arc shape;

[0015] The disc is provided with a plurality of sliding holes, each of which is slidably connected to a breaking rod, bosses are provided at both ends of the breaking rod, the bosses at the lower end of the breaking rod extend into the concave annular groove, and the upper end of the concave annular groove forms a truncated end face.

[0016] Preferably, the limiting tape is a water-soluble paper tape, the drill bit is provided with a water-permeable hole, and the lower end of the tube body is provided with a through hole, which is connected to the annular groove and the water-permeable hole.

[0017] Preferably, the inner wall of the tube body is fixedly connected to a buffer friction sleeve.

[0018] Preferably, the inner hole of the buffer friction sleeve is narrow at the bottom and wide at the top.

[0019] The advantages of the present invention are: a shield tunnel differentiated stratum detection equipment provided by the present invention is lowered to the sampling section through the outer tube and the inner tube, the limit belt is torn off by the pull rope, the limit column slides outward and loses the limiting effect on the disc, and the disc gradually moves toward the upper end of the tube body through the tension spring. During this process, the outer tube and the inner tube are synchronously lowered, the sampling column advances into the tube body, and the disc always protects the upper end of the sampling column. As the upper side of the disc gradually unfolds the rubber sleeve outside the sampling column, the rubber sleeve wraps around the outside of the sampling column and does not generate compression and vertical friction on the sampling column (the unfolded rubber sleeve is straight cylindrical and has no cohesive force), thereby reducing the sampling disturbance effect on soft soil.

[0020] The present invention can stretch the rubber sleeve outwards and make it larger by bulging outwards, gradually putting it on the sampling column, minimizing the friction effect of the sampling column, and the upper end of the concave ring groove forms a truncated end face, and the lower end boss of the breaking rod extends into the concave ring groove and is limited. The disc rises while the breaking rod is relatively stationary. The disc encounters the upper end boss of the breaking rod, and the disc and the breaking rod rise further, and the lower end of the breaking rod pulls the protruding ring off the truncated end face. After being pulled off, the rubber sleeve loses the support function of the concave ring groove, and the gathering effect of the lower end of the rubber sleeve plays a role. When the lower end of the rubber sleeve is gathered by the elastic band, if the rubber sleeve that has passed the pressing groove is stretched downwards, it will be blocked by the pressing spring sheet. During the closing process, the rubber sleeve on the outer wall of the lower end of the sampling column will not be stretched in the opposite direction, and the separated protruding ring plays a supporting role, preventing the lower end of the sampling column from shrinking into a semi-sphere, thereby finally taking a longer effective sample section from the middle of the sampling column. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a basic structural diagram of the present invention;

[0022] Figure 2 It is a schematic diagram of the local structure of the lower end of the outer tube;

[0023] Figure 3 It is a schematic diagram of the internal structure of the tube;

[0024] Figure 4 yes Figure 3 A partial enlarged view of point E in the middle;

[0025] Figure 5 It is a schematic diagram of the structure of the rubber sleeve for covering the sampling column of the present invention. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0027] Example 1

[0028] like Figures 1 to 5 As shown, the present invention provides a shield tunnel differential stratum detection device, comprising an outer tube 1, the outer tube 1 is a hollow cylindrical tubular structure, and a drill bit is installed at the lower end of the outer tube 1;

[0029] A driving device, which is used to drive the outer tube 1 to rotate along its central axis;

[0030] The inner tube 2 is rotatably mounted in the outer tube 1, and the central axis of the inner tube 2 coincides with the central axis of the outer tube 1. The drive device, the outer tube 1, and the inner tube 2 are of the prior art, such as the structure disclosed in the single-action double-tube coring device with patent publication number CN117646611B;

[0031] The lower end of the inner tube 2 is threadedly connected to the sampling tube. The sampling tube thread can be disassembled to install the structure of the existing technology or the special sampling tube of the present invention. Conventional sampling tubes sample hard soil, harder rock cores and softer rock cores at different depths in differentiated strata. The special sampling tube of the present invention samples underground caves and soft soil at alternate positions, thereby jointly realizing differentiated stratum detection. Hard soil, harder rock cores and softer rock cores, underground caves and soft soil are alternately pre-detected by ground geological radar to obtain a predetermined depth;

[0032] The sampling tube of the present invention includes a tube body 3, the upper end of the inner wall of the tube body 3 is fixedly connected to a baffle 31, a disc 32 is slidably connected to the tube body 3, a tension spring 321 is fixedly connected between the disc 32 and the baffle 31, an annular groove 33 is provided on the outer wall of the tube body 3, at least two limiting posts 34 are slidably connected in an annular array in the annular groove 33, limiting holes 341 are provided on the outer side of the disc 32, the limiting holes 341 are adapted to the limiting posts 34, a supporting spring 35 is provided between the limiting posts 34 and the side wall of the annular groove 33, and a limiting band 36 is provided in an annular manner inside the annular groove 33;

[0033] A rolled-up rubber sleeve 37 is provided at the bottom of the disc 32 , and a tightening belt that gathers inwards is provided at the lower end of the rubber sleeve 37 . An expander 4 for releasing the rubber sleeve 37 is provided at the lower end of the tube body 3 .

[0034] The inner wall of the tube body 3 is fixedly connected to the buffer friction sleeve 311, which slows down the sliding speed of the disc 32. The inner hole of the buffer friction sleeve 311 is narrow at the bottom and wide at the top, which is used to adapt to the linear attenuation of the elastic force of the tension spring 321. The descending speed of the tube body 3 and the rising speed of the disc 32 in the buffer friction sleeve 311 are obtained through ground tests to adapt to the speed of the rubber sleeve 37 on the sampling column 20, avoid relative speed mismatch, and avoid vertical friction of the rubber sleeve 37 on the sampling column 20.

[0035] The limiting belt 36 is broken by a conventional structure, such as a pull rope, so that when sampling at a predetermined depth, Figure 5 As shown (in the drilled hole, the inner tube 2 rotates downward to form a drilled surface 30, the middle part of the drilled surface 30 is the sampling column 20, and the rubber sleeve 37 is gradually sleeved on the sampling column 20), as the outer tube 1 and the inner tube 2 descend, the rubber sleeve 37 is gradually released by the winding part at the lower end of the unfolder 4 and sleeved on the sampling column 20. Compared with the prior art in which a sleeve is sleeved on the sampling column 20, the upper end of the sampling column 20 will not slide upward from the bottom of the sleeve to the top of the sleeve due to friction, thereby being more suitable for soft soil and having less disturbance to the soft soil.

[0036] In the present invention, the outer tube 1 and the inner tube 2 are lowered to the sampling section, and the limiting belt 36 is torn off by the pull rope. The limiting column 34 slides outward and loses its limiting effect on the disc 32. The disc 32 gradually moves toward the upper end of the tube body 3 through the tension spring 321. During this process, the outer tube 1 and the inner tube 2 are synchronously lowered, and the sampling column 20 advances into the tube body 3. The disc 32 always protects the upper end of the sampling column 20. As the upper side of the disc 32 gradually unfolds the rubber sleeve 37 outside the sampling column 20, the rubber sleeve 37 wraps around the outside of the sampling column 20 and does not generate compression and vertical friction on the sampling column 20 (the unfolded rubber sleeve 37 is straight and has no cohesive force), thereby reducing the sampling disturbance effect on soft soil.

[0037] Example 2

[0038] like Figures 1 to 5 As shown, the expander 4 includes a supporting ring 41, the lower end of the tube body 3 is fixedly connected to the supporting ring 41 by a thread, which is convenient for disassembly, and the inner wall of the tube body 3 is fixedly connected to the retaining ring 42. A recessed ring groove 43 is provided on the outer side of the supporting ring 41, and the retaining ring 42 extends into the recessed ring groove 43 to form an annular channel. A protruding ring 44 is provided on the upper part of the outer side of the supporting ring 41, and the protruding ring 44 is provided with an annular pressing groove 45. A plurality of pressing spring pieces 46 are fixedly connected in an annular row on the upper side of the retaining ring 42. The pressing spring pieces 46 are in a downwardly concave arc shape, so that the rubber sleeve 37 can pass upward conveniently. When the rubber sleeve 37 is pulled back, the pressing spring pieces 46 are pressed tightly and immovably. A plurality of sliding holes are provided on the disc 32, and a breaking rod 47 is slidably connected in each sliding hole. Bosses are provided at both ends of the breaking rod 47. The boss at the lower end of the breaking rod 47 extends into the recessed ring groove 43, and the upper end of the recessed ring groove 43 forms a truncated end face.

[0039] The protruding ring 44 protrudes outwards, stretching the rubber sleeve 37 outwards and making it larger, gradually putting it on the sampling column 10 to minimize the friction effect on the sampling column 10, and the upper end of the recessed ring groove 43 forms a truncated end face. The lower end boss of the breaking rod 47 extends into the recessed ring groove 43 and is limited. The disc 32 rises while the breaking rod 47 is relatively stationary. The disc 32 encounters the upper end boss of the breaking rod 47, and the disc 32 and the breaking rod 47 rise further. The lower end of the breaking rod 47 breaks the protruding ring 44 from the truncated end face. After breaking, the rubber sleeve 37 is lost due to loss of Without the supporting function of the recessed annular groove 43, the gathering effect of the lower end of the rubber sleeve 37 comes into play. When the lower end of the rubber sleeve 37 is gathered by the elastic band, if the rubber sleeve 37 that has passed through the pressing groove 45 is stretched downward, it will be blocked by the pressing spring piece 46. During the closing process, the rubber sleeve 37 on the outer wall of the lower end of the sampling column 10 will not be stretched in the opposite direction, and the separated protruding ring 44 plays a supporting role, preventing the lower end of the sampling column 10 from shrinking into a semi-sphere, so that the effective sample section intercepted in the middle of the sampling column 10 is finally longer.

[0040] Example 3

[0041] like Figures 1 to 5As shown, the limiting tape 36 is a water-soluble paper tape, the drill bit is provided with a water-permeable hole 361, and a through hole 362 is provided at the lower end of the tube body 3. The through hole 362 is connected with the annular groove 33 and the water-permeable hole 361. It is preferably used in a water-rich geological environment. The water-soluble paper tape is a conventional material in the drill barrel field. It breaks when it encounters water. There is no need to set a pull rope in the tube, which is more flexible and convenient to use.

[0042] 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 shield tunnel differentiated stratum detection device, comprising an outer tube (1), the outer tube (1) being a hollow cylindrical tubular structure, and a drill bit being installed at the lower end of the outer tube (1); A driving device, the driving device is used to drive the outer tube (1) to rotate along its own central axis; An inner tube (2) is rotatably mounted in the outer tube (1), and a central axis of the inner tube (2) coincides with a central axis of the outer tube (1); The lower end of the inner tube (2) is threadedly connected to the sampling tube; Its characteristics are: The sampling tube comprises a tube body (3), the upper end of the inner wall of the tube body (3) is fixedly connected to a baffle (31), a disc (32) is slidably connected inside the tube body (3), a tension spring (321) is fixedly connected between the disc (32) and the baffle (31), an annular groove (33) is provided on the outer wall of the tube body (3), at least two limiting columns (34) are slidably connected in an annular array inside the annular groove (33), a limiting hole (341) is provided on the outer side of the disc (32), the limiting hole (341) is adapted to the limiting column (34), a supporting spring (35) is provided between the limiting column (34) and the side wall of the annular groove (33), and a limiting belt (36) is provided in an annular shape inside the annular groove (33); A rolled rubber sleeve (37) is provided at the bottom of the disc (32), a tightening belt that gathers inwards is provided at the lower end of the rubber sleeve (37), and an expander (4) for releasing the rubber sleeve (37) is provided at the lower end of the tube body (3).

2. The shield tunnel differentiated stratum detection device according to claim 1, characterized in that: The deployer (4) comprises a supporting ring (41), the lower end of the tube body (3) is fixedly connected to the supporting ring (41), the inner wall of the tube body (3) is fixedly connected to a retaining ring (42), a recessed annular groove (43) is provided on the outer side of the supporting ring (41), and the retaining ring (42) extends into the recessed annular groove (43) to form an annular channel.

3. The shield tunnel differentiated stratum detection device according to claim 2, characterized in that: A protruding ring (44) is provided on the upper outer side of the support ring (41).

4. The shield tunnel differentiated stratum detection device according to claim 3, characterized in that: The protruding ring (44) is provided with an annular pressing groove (45), and a plurality of pressing spring pieces (46) are fixedly connected in an annular arrangement on the upper side of the retaining ring (42), and the pressing spring pieces (46) are in a downwardly concave arc shape; The disc (32) is provided with a plurality of sliding holes, each of which is slidably connected to a breaking rod (47), and bosses are provided at both ends of the breaking rod (47). The bosses at the lower end of the breaking rod (47) extend into the recessed annular groove (43), and the upper end of the recessed annular groove (43) forms a truncated end face.

5. The shield tunnel differentiated stratum detection device according to claim 1, characterized in that: The limiting belt (36) is a water-soluble paper belt, the drill bit is provided with a water-permeable hole (361), and the lower end of the tube body (3) is provided with a through hole (362), which is communicated with the annular groove (33) and the water-permeable hole (361).

6. The shield tunnel differentiated stratum detection device according to claim 1, characterized in that: The inner wall of the tube body (3) is fixedly connected to a buffer friction sleeve (311).

7. The shield tunnel differentiated stratum detection device according to claim 6, characterized in that: The inner hole of the buffer friction sleeve (311) is narrow at the bottom and wide at the top.

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