Device for installing geophone in seismic wave method advanced geological forecast hole

Abstract

The utility model discloses a geophone mounting device in a seismic wave method advanced geological forecast hole, which comprises a pipe fitting I and a pipe fitting II made of PVC (polyvinyl chloride) materials, the length of the pipe fitting I and the length of the pipe fitting II are both larger than the depth of a drill hole, the pipe fitting I is longer than the pipe fitting II, the outer diameter of the pipe fitting I is smaller than that of the pipe fitting II, the outer diameter of the pipe fitting II is smaller than the diameter of the drill hole, and the front end of the pipe fitting I is provided with a loading groove for placing an object to be pushed. The second pipe fitting is provided with scale marks, and the zero scale marks are aligned to the front end of the carrying groove. The second pipe fitting is used for being integrally inserted into the drill hole together with the first pipe fitting inserted into the second pipe fitting and the to-be-pushed object placed in the object carrying groove till the second pipe fitting cannot continue to be pushed. The first pipe fitting is used for abutting against the to-be-pushed object to the bottom of the hole till the second pipe fitting is drawn back to be separated from the to-be-pushed object. When the to-be-pushed object is a detector, the front end of the object carrying groove abuts against the protruding shoulder of the detector, and the second pipe fitting is further used for measuring the hole entering depth of the detector when the second pipe fitting cannot be pushed continuously. The device is light in weight and portable, simplifies the installation of in-hole detectors, and can measure the in-hole depth of the detectors and the distance between the detectors.

Description

Technical Field

[0001] The utility model relates to the technical field of advanced geological prediction, in particular to a hole-in-hole detector installation device for advanced geological prediction by seismic wave method. Background Technique

[0002] With the rapid development of China's transportation construction industry and the continuous improvement of technical level, the number of long mountain tunnels (holes) is increasing. During the excavation of tunnels (holes), threats such as karst, mud and water inrush, faults, and collapses are faced, seriously affecting the safety of people's lives and equipment. Advanced geological prediction is an effective way to solve this problem, and advanced geological prediction has also become an indispensable process in the construction of tunnels (holes).

[0003] At present, common advanced geological prediction methods include seismic wave method, ground penetrating radar method, electrical method, transient electromagnetic method, etc. Among them, the most widely used is the seismic wave reflection method. The means of using the seismic wave reflection method for advanced geological prediction are usually as follows: At a certain height position from the ground (such as 1.5 m above the ground) on the side walls on both sides of the tunnel (hole), the required number of drill holes are pre-drilled according to the designed hole spacing, the hole depth is about 2 m, and the drill holes on both sides are symmetrically distributed; detectors are installed in each drill hole; seismic waves are artificially excited, and the hole-in-hole detectors are used to receive the seismic reflection waves, and the reflection waves are analyzed by a seismograph.

[0004] However, due to the limited tunnel site, cross-operation, and complex on-site conditions, the hole depth and hole position (hole spacing) of the actually formed drill holes often deviate from the designed observation system, resulting in errors between the final detector hole depth and the distance between detectors (that is, the hole spacing between the corresponding two drill holes) and the design. If these errors are ignored, it will affect the accuracy of advanced geological prediction. Most of the existing devices for installing hole-in-hole detectors are relatively bulky, not convenient to operate, low in efficiency, high in cost, and cannot measure the depth and distance. It is necessary to use a tape measure and a straight ruler to measure the detector hole depth and the distance between detectors, so further improvement is needed. Content of the Utility Model

[0005] In view of the above-mentioned defects and deficiencies in the prior art, the utility model provides a hole-in-hole detector installation device for advanced geological prediction by seismic wave method to solve the problems that most of the existing devices for installing hole-in-hole detectors are relatively bulky, not convenient to operate, low in efficiency, high in cost, and cannot measure the depth and distance.

[0006] The above object of the utility model is achieved by the following technical solutions:

[0007] An in-hole detector installation device for advanced geological prediction by seismic wave method, comprising a first pipe fitting and a second pipe fitting made of PVC material. The lengths of the first pipe fitting and the second pipe fitting are both greater than the depth of a pre-drilled hole, and the first pipe fitting is longer than the second pipe fitting. The outer diameter of the first pipe fitting is smaller than that of the second pipe fitting, and the outer diameter of the second pipe fitting is smaller than the diameter of the drilled hole. An arc-shaped loading groove for placing the object to be pushed is opened at the front end. A scale line is axially arranged on the outer surface of the pipe wall of the second pipe fitting, and its zero scale is aligned with the front end of the loading groove. Among them,

[0008] The second pipe fitting is used to insert the whole of the first pipe fitting inserted therein and the object to be pushed placed in the loading groove into the drilled hole until the second pipe fitting can no longer be pushed forward. The first pipe fitting is used to stop the object to be pushed in the loading groove at the bottom of the hole when the second pipe fitting can no longer be pushed forward until the second pipe fitting is withdrawn in the hole until the front end of its loading groove is separated from the object to be pushed at the bottom of the hole, and then the first pipe fitting and the second pipe fitting are withdrawn from the drilled hole together.

[0009] The object to be pushed includes strip-shaped yellow mud and a detector to be successively pushed to the bottom of the inner hole of the drilled hole. When the object to be pushed is the detector, the front end of the loading groove abuts against the shoulder of the detector. The second pipe fitting is also used to measure the depth of the detector inserted into the hole when it cannot be pushed forward in the hole.

[0010] Preferably, the scale line is axially arranged throughout on the outer surface of the pipe wall of the second pipe fitting.

[0011] Preferably, the accuracy of the scale line is mm.

[0012] Preferably, the outer diameter of the first pipe fitting is 30 mm, the outer diameter of the second pipe fitting is 40 mm, and the diameter of the drilled hole is 50 mm.

[0013] Preferably, the first pipe fitting is 2.5 m long and the second pipe fitting is 2.2 m long.

[0014] Compared with the prior art, the beneficial effects of the technical solution of the present utility model are as follows:

[0015] The present utility model forms an in-hole detector installation device by the cooperation of the first pipe fitting and the second pipe fitting made of PVC material, and the second pipe fitting has a scale. It can not only conveniently push the yellow mud and the detector to the bottom position of the inner hole of the drilled hole, but also conveniently measure the depth of the detector in the hole and the distance between the detectors, making the detection result more accurate and conducive to improving the accuracy of advanced geological prediction; the operation is convenient, which is conducive to improving the on-site work efficiency; the device is light in weight, portable, the materials are easy to obtain, the production is simple, and the cost is low, having certain engineering practical significance.

[0016] Other advantages, objectives and features of the present utility model will be partially reflected by the following description, and partially will also be understood by those skilled in the art through the research and practice of the present utility model. Description of the Drawings

[0017] Figure 1 Schematic diagram before combination of the geophone installation device in the seismic wave method advanced geological prediction hole of the exemplary embodiment of the present utility model;

[0018] Figure 2 Schematic diagram before pushing the geophone into the hole of the geophone installation device in the seismic wave method advanced geological prediction hole of the exemplary embodiment of the present utility model;

[0019] Figure 3 Schematic diagram when the geophone installation device in the seismic wave method advanced geological prediction hole of the exemplary embodiment of the present utility model pushes the geophone to the bottom of the hole;

[0020] Figure 4 Schematic diagram when the geophone installation device in the seismic wave method advanced geological prediction hole of the exemplary embodiment of the present utility model extracts the drill hole;

[0021] In the figure: pipe fitting one 1, pipe fitting two 2, load-bearing groove 21, scale line 22, geophone 3, shoulder 31, yellow mud 4, surrounding rock 5. Detailed implementation manners

[0022] The attached drawings are only for illustrative purposes and cannot be construed as a limitation of this patent;

[0023] For better illustration of this embodiment, some components in the attached drawings are omitted, enlarged or reduced, and do not represent the dimensions of the actual product;

[0024] For those skilled in the art, it is understandable that some well-known structures and their descriptions in the attached drawings may be omitted;

[0025] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "set" and "connect" should be understood in a broad sense. For example, it 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 directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations. The orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "front", "rear", etc. is based on the orientation or positional relationship shown in the attached drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present utility model.

[0026] The technical solutions of the present utility model will be further described below with reference to the attached drawings and embodiments.

[0027] AsFigure 1 As shown, the geophone installation device in the seismic wave method advanced geological prediction hole of the exemplary embodiment of the present utility model includes a pipe fitting 1 and a pipe fitting 2 made of PVC material. The lengths of the pipe fitting 1 and the pipe fitting 2 are both greater than the hole depth of the pre-drilled hole, and the pipe fitting 1 is longer than the pipe fitting 2. The outer diameter of the pipe fitting 1 is smaller than that of the pipe fitting 2, and the outer diameter of the pipe fitting 2 is smaller than the hole diameter of the drill hole. An arc-shaped loading groove 21 for placing the object to be pushed is opened at the front end. A scale line 22 is provided on the outer surface of the pipe wall of the pipe fitting 2 along the axial direction, and its zero scale is aligned with the front end of the loading groove 21.

[0028] In this way, the pipe fitting 1 can be inserted into the pipe fitting 2 and the pipe fitting 1 can be pulled back and forth as needed. The pipe fitting 2 together with the pipe fitting 1 inserted therein and the object to be pushed placed in the loading groove 21 can be integrally inserted into the drill hole until the pipe fitting 2 can no longer be advanced (the object to be pushed has reached the bottom of the hole). The above length settings ensure that the tails of the pipe fitting 1 and the pipe fitting 2 are always outside the hole, facilitating the operator to hold the tail of the pipe fitting 2 with one hand and the tail end of the pipe fitting 1 with the other hand for pushing operation. Since the PVC pipe is light in weight, the pushing operation is convenient and the labor intensity is small.

[0029] Among them, when the pipe fitting 2 cannot be advanced further in the hole, the pipe fitting 1 is used to push the object to be pushed in the loading groove 21 to the bottom of the hole until the pipe fitting 2 is withdrawn in the hole until the front end of its loading groove is separated from the object to be pushed at the bottom of the hole. At this time, the pipe fitting 1 and the pipe fitting 2 can be slowly withdrawn from the drill hole together.

[0030] Since the geophone 3 needs to be coupled with the surrounding rock 5 at the bottom of the hole through yellow mud 4 (the yellow mud acts as a coupling agent), the object to be pushed includes strip-shaped yellow mud and a geophone to be pushed to the bottom of the drill hole in sequence.

[0031] As Figure 2 shown, the head of the used geophone 3 radially protrudes from the cylindrical tail to form a shoulder 31. When the object to be pushed is a geophone, the geophone 3 is placed in the loading groove 21 through its tail, and the head extends forward beyond the loading groove 21. The front end of the loading groove abuts against the shoulder 31. As Figure 3 shown, when the pipe fitting 2 cannot be advanced further in the hole (the head of the geophone has reached the bottom of the hole), the front end of its loading groove abuts against the shoulder 31 of the geophone 3. In this way, since the size of the geophone is determined and the position of the front end (zero scale) of the loading groove relative to the geophone is determined, the depth of the geophone inserted into the hole can be measured through the pipe fitting 2 at this time, which is convenient and fast.

[0032] It should be noted that one geophone is installed in each drill hole.

[0033] It should be understood that the pipe fitting 2 can also be used alone as a measuring scale to measure the distance between two drill holes, that is, to measure the distance between the geophones of the two drill holes.

[0034] In specific implementation, the borehole size for installing the detector is usually 50mm in diameter and 2m in depth. Based on this, pipe 1 can use a PVC pipe with a length of 2.5m and an outer diameter of 30mm; pipe 2 can use a PVC pipe with a length of 2.2m and an outer diameter of 40mm. It should be understood that the size of the detector is smaller than the borehole size, and its tail radial direction is slightly larger than the radial direction of pipe 1.

[0035] It should be noted that since the borehole diameter for installing the detector is usually small, both Pipe Fitting 2 and Pipe Fitting 1 are relatively thin pipe fittings. In practice, when Pipe Fitting 1 pushes the yellow mud, its front end pipe opening will quickly be blocked by a small amount of yellow mud.

[0036] In some embodiments, the scale lines 22 are arranged along the axial length on the outer surface of the tube wall of the tube 2 to provide a measuring range that can meet the measurement requirements.

[0037] To ensure the accuracy of the measurement, the accuracy of the scale lines can be set to mm level.

[0038] The steps for installing the detector using this device are as follows:

[0039] S1. Push the yellow mud 4 to the bottom of the borehole to act as a coupling agent between the detector 3 and the surrounding rock 5 at the bottom of the hole. Insert the pipe 1 into the pipe 2, knead the yellow mud into strips and place them in the loading groove 21 at the front end of the pipe 2, and then insert the whole into the borehole through the pipe 2 until the pipe 2 can no longer be pushed forward. Use the pipe 1 to stop the yellow mud 4 at the bottom of the hole and couple it with the surrounding rock 5, and then slowly withdraw the pipe 2 out of the hole until the front end of its loading groove is separated from the yellow mud at the bottom of the hole (when the pipe 2 is withdrawn until its tail end is aligned with the tail end of the pipe 1, the front end of the loading groove has been separated from the yellow mud at the bottom of the hole). At this time, the pipe 1 and the pipe 2 can be slowly withdrawn from the borehole together (the pipe 1 is still inserted in the pipe 2).

[0040] S2, push the detector 3 to the bottom of the borehole. Pull and adjust the position of the pipe 1 relative to the pipe 2 to avoid the loading groove 21, place the tail of the detector 3 in the loading groove 21 (the detector signal line is located outside the pipe 2), and extend the head forward outside the loading groove 21. The front end of the loading groove abuts against the convex shoulder 31 of the detector 3 (such as Figure 2 Then, the whole is inserted into the borehole through the pipe 2 until the pipe 2 can no longer be pushed forward (as shown in FIG. Figure 3 As shown in the figure, the detector is inserted into the yellow mud and the head has reached the bottom of the hole). Use pipe 1 to stop the detector 3 at the bottom of the hole. The detector 3 is coupled with the surrounding rock 5 at the bottom of the hole through the yellow mud 4. Use pipe 2 to record the depth of the detector entering the hole at this time, and then slowly withdraw pipe 2 out of the hole until the front end of its carrier groove is separated from the detector and the yellow mud at the bottom of the hole (when the pipe 2 is withdrawn until its tail end is aligned with the tail end of pipe 1, the front end of the carrier groove has been separated from the detector and the yellow mud at the bottom of the hole, please refer to Figure 4) At this time, the pipe fitting 1 and the pipe fitting 2 can be slowly withdrawn together from the drill hole.

[0041] S3. Use another piece of yellow mud to seal the orifice of the drill hole, and the installation of the geophone for this drill hole is completed.

[0042] It should be noted that after repeating the above steps to complete the installation of the geophones in each drill hole one by one, the pipe fitting 1 is separated from the pipe fitting 2, and the distance between two adjacent drill holes is measured by using the pipe fitting 2, that is, the distance between the geophones in these two drill holes is measured. After all the measurements are completed, the geophones in each hole can be connected to the seismic large line (which is connected to the seismograph), and blasting is carried out to collect data.

[0043] As mentioned above, only the preferred specific embodiments of the present invention are described, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and concept of the present invention, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. An installation device for downhole geophones in advance geological prediction by seismic wave method, characterized in that, It includes pipe fitting one and pipe fitting two made of PVC material. The lengths of pipe fitting one and pipe fitting two are both greater than the hole depth of the pre-drilled hole, and pipe fitting one is longer than pipe fitting two. The outer diameter of pipe fitting one is smaller than that of pipe fitting two, and the outer diameter of pipe fitting two is smaller than the aperture of the drilled hole. An arc-shaped loading groove for placing the object to be pushed is opened at the front end. A scale line is axially provided on the outer surface of the pipe wall of pipe fitting two, and its zero scale is aligned with the front end of the loading groove. Among them, Pipe fitting two is used to insert the whole of pipe fitting one inserted into it and the object to be pushed placed in the loading groove into the drilled hole until pipe fitting two can no longer be pushed forward. Pipe fitting one is used to stop the object to be pushed in the loading groove at the bottom of the hole when pipe fitting two can no longer be pushed forward until pipe fitting two is withdrawn in the hole until the front end of its loading groove is separated from the object to be pushed at the bottom of the hole, and then pipe fitting one and pipe fitting two are withdrawn from the drilled hole together. The object to be pushed includes strip-shaped yellow mud and a geophone to be successively pushed to the bottom of the inner hole of the drilled hole. When the object to be pushed is a geophone, the front end of the loading groove abuts against the shoulder of the geophone, and pipe fitting two is also used to measure the depth of the geophone inserted into the hole when it can no longer be pushed forward in the hole.

2. The geophone installation device in the advanced geological prediction borehole by the seismic wave method according to claim 1, characterized in that The scale line is axially provided throughout the outer surface of the pipe wall of pipe fitting two.

3. The geophone installation device in the advanced geological prediction borehole by the seismic wave method according to claim 1, characterized in that, The precision of the scale line is mm.

4. The geophone installation device in the advance geological prediction borehole by the seismic wave method according to claim 1, characterized in that, The outer diameter of pipe fitting one is 30 mm, the outer diameter of pipe fitting two is 40 mm, and the aperture of the drilled hole is 50 mm.

5. The geophone installation device in the advanced geological prediction borehole by the seismic wave method according to claim 1, characterized in that, Pipe fitting one is 2.5 m long, and pipe fitting two is 2.2 m long.

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