A rapid dry coupling device for the bottom of a borehole in a seismic detector

Abstract

This invention discloses a rapid dry coupling device for the bottom of a seismic detector borehole. The device includes an upper spring sleeve, a lower spring sleeve, a detector sleeve, a spring, an air pump, and an air guide tube. The upper spring sleeve has a push rod groove, a mating groove, a spring groove, an air bladder, and a traction steel wire. The lower spring sleeve has a retaining ring and a spring groove. The detector sleeve has a fixing groove, a detector groove, and a detector cable outlet. The air pump is connected to the air bladder through the air guide tube. The detector sleeve is connected to the upper spring sleeve through the lower spring sleeve. The two ends of the spring are located inside the spring grooves of the upper spring sleeve and the lower spring sleeve, respectively. This device is simple to operate, low in cost, and reusable. It enables the detector to be in a strong coupling and hard contact state with the surrounding rock, optimizing the signal-to-noise ratio of seismic wave acquisition, reducing the difficulty of data analysis, and improving interpretation accuracy. It is suitable for borehole detector coupling work such as tunnel advance prediction and microseismic monitoring.

Description

Technical Field

[0001] This invention relates to the field of geophysical exploration technology for engineering projects such as water conservancy, railways, and transportation, and specifically to a rapid dry coupling device for the bottom of a seismic wave detector. Background Technology

[0002] In recent years, TBMs have been increasingly widely used in the construction of deep-buried long tunnels in engineering fields such as water conservancy, railways, and transportation, greatly improving tunnel excavation efficiency. However, while efficiency has increased, it has also brought many risks, with major engineering accidents occurring frequently. Adverse geological conditions ahead of the tunnel face are the main cause of these accidents. Therefore, advanced geological prediction is particularly important during construction. During construction, because the TBM cutterhead is in close contact with the tunnel face, most advanced geological prediction methods used at the tunnel face cannot be implemented. Therefore, in the construction of deep-buried long tunnels using TBMs, advanced geological prediction based on seismic wave methods and microseismic monitoring are mainly used to determine the condition of the surrounding rock ahead, and to predict the location of adverse geological conditions such as faults, weak rock zones, karst, goaf areas, and rock bursts in a timely manner.

[0003] When using seismic wave-based advanced geological prediction and microseismic monitoring for forecasting, seismic wave detectors need to be placed at the bottom of the borehole on the tunnel sidewall. Simultaneously, the detectors must be coupled with the rock mass at the bottom of the borehole. The coupling effect of the detectors has a significant impact on the intensity of the reflected seismic wave signal and the signal-to-noise ratio, thus affecting the interpretation accuracy of adverse geological conditions ahead of the tunnel face. Conventional detector coupling methods often involve pushing the detector into the borehole using a push rod and performing indirect wet coupling using materials such as grease or red mud. The coupling effect inevitably has a certain impact on seismic wave acquisition.

[0004] Therefore, how to improve the coupling tightness between the detector and the surrounding rock at the bottom of the borehole, and to achieve direct dry coupling between the detector and the surrounding rock at the bottom of the borehole, is a key technical issue for those skilled in the art to improve interpretation accuracy. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a simple and low-cost borehole bottom rapid dry coupling device for seismic wave detectors, which is suitable for realizing direct dry coupling between the detector and the surrounding rock at the bottom of the borehole for advanced geological prediction and microseismic monitoring based on seismic wave method. This improves the tight coupling between the detector and the surrounding rock at the bottom of the borehole and realizes direct dry coupling between the detector and the surrounding rock at the bottom of the borehole, thereby improving the accuracy of advanced geological prediction and microseismic monitoring interpretation.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a rapid dry coupling device for the bottom of a seismic wave detector hole, comprising an upper spring sleeve, a lower spring sleeve, a detector sleeve, a spring, an air bladder, an air pump, and a retaining ring. The detector sleeve is cylindrical, with an internal thread at the top and an axially penetrating sidewall groove at the bottom. The upper end of the upper spring sleeve, which is closed at the top, has a recessed push rod groove on its outer side, and the lower end of the cylinder wall has an upward-facing groove... The lower end of the closed lower spring sleeve has external threads, allowing it to be screwed onto the top of the detector sleeve. The upper end of the lower spring sleeve slides into the annular slot of the upper spring sleeve, and is slidably fixed to the upper spring sleeve by a retaining ring fitted on the outer wall of the lower spring sleeve. The spring is installed in the internal cavity formed by the upper spring sleeve and the lower spring sleeve. The air bladder is fitted on the outer wall of the upper spring sleeve, and the air pump is connected to the air bladder through an air guide tube.

[0007] The lower end of the outer wall of the annular slot has an internal thread, and the retaining ring has an external thread. The retaining ring is screwed onto the outer wall of the annular slot.

[0008] A partition is provided below the internal thread at the top of the detector sleeve, dividing the detector sleeve into upper and lower parts.

[0009] A traction steel wire is connected to the outer wall of the detector sleeve located at the top of the airbag.

[0010] The beneficial effects of this invention are: the device is simple to operate, low in cost, reusable, and allows the geophone to be in a strong coupling and hard contact state with the surrounding rock, greatly optimizing the signal-to-noise ratio of seismic wave acquisition, reducing the difficulty of subsequent data analysis, and improving the accuracy of result interpretation. It is suitable for coupling seismic wave geophones in tunnel boreholes for purposes such as advanced geological prediction and microseismic monitoring. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the borehole bottom rapid dry coupling device for seismic wave detectors according to the present invention.

[0012] Figure 2 This is a longitudinal cross-sectional schematic diagram of the borehole bottom rapid dry coupling device for seismic wave detectors according to the present invention. Detailed Implementation

[0013] The technical solution of the present invention will now be clearly and completely described in conjunction with the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0014] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0015] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0016] like Figure 1 , 2 As shown, this invention relates to a rapid dry coupling device for the bottom of a seismic detector aperture, comprising an upper spring sleeve 1, a lower spring sleeve 12, a detector sleeve 17, a spring 22, an air bladder 6, an air pump 7, and a retaining ring 10. The detector sleeve 17 is cylindrical, with an internal thread at its top and an axially penetrating sidewall groove 18 at its bottom. The upper end of the upper spring sleeve 1, which is closed at the top, has a recessed push rod groove 2 on its outer side, and an annular slot 4 extending upwards from the bottom of the lower cylinder wall. The lower end of the spring sleeve 1, which is closed at the bottom, has a spring sleeve 12. The lower end of the lower sleeve 12 has an external thread, so that the lower spring sleeve 12 is screwed onto the top of the detector sleeve 17. The upper end of the lower spring sleeve 12 is slidably inserted into the annular slot 4 of the upper spring sleeve 1, and the lower spring sleeve 12 is slidably fixed onto the upper spring sleeve 1 by the retaining ring 10 fitted on the outer wall of the lower spring sleeve 12. The spring 22 is installed in the internal cavity formed by the upper spring sleeve 1 and the lower spring sleeve 12. The air bag 6 is fitted on the outer wall of the upper spring sleeve 1, and the air pump 7 is connected to the air bag 6 through the air guide tube 8.

[0017] The lower end of the outer wall of the annular slot 4 has an internal thread, and the retaining ring 10 has an external thread. The retaining ring 10 is screwed onto the outer wall of the annular slot 4.

[0018] A partition 19 is provided below the internal thread at the top of the detector sleeve 17, dividing the detector sleeve 17 into upper and lower parts.

[0019] A traction steel wire 9 is connected to the outer wall of the detector sleeve 17 located on the upper part of the airbag 6.

[0020] In use, first place the detector into the detector sleeve of the device, and lead the detector cable out along the groove 18 on the side wall. Insert one end of the push rod into the push rod groove 2, and then use the push rod to push the device and the detector together to the bottom of the borehole. After the detector reaches the bottom of the hole, use a certain force to push the device so that the detector is dry coupled with the rock mass at the bottom of the hole. At this time, the spring 22 is in a contracted state, maintaining the pushing force of the push rod while using the air pump 7 to inflate the air bag 6 until the air bag 6 expands and makes tight contact with the hole wall. Release the push rod and use the traction steel wire 9 to check whether the device is in a fixed state. The friction between the air bag 4 and the rock mass at the bottom of the hole maintains the contracted state of the spring 22. In the contracted state, the spring 22 will maintain the dry coupling state between the detector and the rock mass at the bottom of the hole through the reaction force. At this time, the test can be carried out. After the test is completed, first expel the gas in the air bag 6 through the air guide tube 8, and then use the traction steel wire 9 to pull the device out of the borehole.

[0021] The embodiments described above are only used to illustrate the technical ideas and features of the present invention. Their purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly. The patent scope of the present invention should not be limited by these embodiments. That is, any equivalent changes or modifications made in accordance with the spirit disclosed in the present invention still fall within the patent scope of the present invention.

Claims

1. A rapid dry coupling device for the bottom of a seismic detector borehole, characterized in that, The device includes an upper spring sleeve (1), a lower spring sleeve (12), a detector sleeve (17), a spring (22), an air bladder (6), an air pump (7), and a retaining ring (10). The detector sleeve (17) is cylindrical, with an internal thread at the top and an axially penetrating sidewall groove (18) at the bottom. The upper end of the closed upper spring sleeve (1) has a recessed push rod groove (2) on its outer side, and an annular slot (4) extending upward from the bottom in the lower cylinder wall. The lower end of the closed lower spring sleeve (12) has an external thread at its lower end, allowing for... The lower spring sleeve (12) is screwed to the top of the detector sleeve (17). The upper end of the lower spring sleeve (12) is slidably inserted into the annular slot (4) of the upper spring sleeve (1). The lower spring sleeve (12) is slidably fixed to the upper spring sleeve (1) by the retaining ring (10) on the outer wall of the lower spring sleeve (12). The spring (22) is installed in the internal cavity formed by the upper spring sleeve (1) and the lower spring sleeve (12). The air bag (6) is fitted on the outer wall of the upper spring sleeve (1). The air pump (7) is connected to the air bag (6) through the air guide tube (8).

2. The rapid dry coupling device for the bottom of a seismic detector borehole according to claim 1, characterized in that, The lower end of the outer wall of the annular slot (4) has an internal thread, and the retaining ring (10) has an external thread. The retaining ring (10) is screwed onto the outer wall of the annular slot (4).

3. The rapid dry coupling device for the bottom of a seismic detector borehole according to claim 1, characterized in that, A partition (19) is provided below the internal thread at the top of the detector sleeve (17), dividing the detector sleeve (17) into upper and lower parts.

4. The rapid dry coupling device for the bottom of a seismic detector borehole according to claim 1, characterized in that, A traction wire (9) is connected to the outer wall of the detector sleeve (17) located on the upper part of the airbag (6).

Images