Rock-soil wave velocity tester

Abstract

The utility model discloses a rock-soil wave velocity tester, which relates to the technical field of rock-soil engineering survey, and comprises a host, the host is connected with a seismic source and a first detector through a connecting line, the upper part of the first detector is a detection assembly, and the lower part of the first detector is a support assembly; the supporting assembly comprises a base, a supporting cylinder, a shell, a first connecting rod, a second connecting rod, a sleeve and a linear electric cylinder. The sleeve is fixedly connected to the base and fixedly provided with a linear electric cylinder, the upper portion of the linear guide rod is fixedly connected with the sleeve, the sleeve is connected to the supporting cylinder in a sleeving mode, the sleeve is hinged to a first connecting rod, the supporting cylinder is hinged to a second connecting rod, and a supporting plate is hinged to the other end of the first connecting rod and the other end of the second connecting rod. A movable groove is formed in the shell, the sleeve and the supporting cylinder are arranged in the shell, the linear electric cylinder drives the sleeve, and the sleeve drives the supporting plate to stretch out of or retract into the shell through the first connecting rod; the arrangement of the supporting part enables the first detector to be tightly attached to the wall of the drill hole, and detection errors are avoided.

Description

Technical Field

[0001] This utility model relates to the field of geotechnical engineering surveying technology, and in particular to a geotechnical wave velocity tester. Background Technology

[0002] Soil and rock wave velocity testing measures the wave velocities of compression waves, shear waves, or Rayleigh waves in soil, and uses these velocities to calculate the dynamic elastic modulus, dynamic shear modulus, and dynamic Poisson's ratio of soil and rock under varying conditions. When a solid medium is subjected to an external force, it experiences stress and strain. After the stress dissipates, the strain and stress become unbalanced, and the strain propagates in the medium as elastic waves. These elastic waves include surface waves and volume waves, with volume waves further divided into compression waves (P-waves) and shear waves (S-waves). In geotechnical engineering investigations, the propagation velocity of shear waves (S-waves) is the primary focus, as it is closely related to the dynamic characteristics of soil and rock masses. The single-hole method for soil and rock wave velocity testing, also known as the single-hole layer inspection method or single-hole wave velocity method, is a method of wave velocity testing conducted within a vertical borehole. By applying a horizontal impact force to the surface near the borehole opening and measuring the arrival time of the impact signal at different depths within the borehole, the propagation velocity of the shear wave within the soil and rock layer is determined.

[0003] The single-hole method for testing rock and soil wave velocity typically includes the following steps: drilling, installing the first geophone, vibration, signal reception and recording, and data processing. During the installation of the first geophone, it needs to be placed in the borehole and kept close to the borehole wall to facilitate signal reception. Patent publication number CN218938202U discloses a rock and soil wave velocity tester, including a main unit connected to a vibration source and a first geophone. A support rod is installed on the right side of the first geophone, and the support rod is vertical with its top end touching the first geophone. The detector is hinged, with its bottom end connected to a crossbar to the left. The crossbar is engaged by a first electromagnetic pull rod inside the first detector. A vertical slide rail is installed on the right side of the first detector, slidably connecting to a slider. A gas spring connects the support rod and the slider, with the connection end between the gas spring and the support rod higher than the connection end between the gas spring and the slider. The hinge axis between the support rod and the first detector is located to the left of the gas spring axis. The slider is engaged by a second electromagnetic pull rod inside the first detector. The length of the slide rail below the slider is greater than the retracted length of the gas spring. The main unit controls the connection between the first and second electromagnetic pull rods. While this structure facilitates the retrieval of the first detector, the point contact between the support rod and the borehole wall prevents the first detector from being tightly fitted against the borehole wall, leading to inaccurate monitoring results. Utility Model Content

[0004] To address the above shortcomings, this utility model provides a rock and soil wave velocity tester that enables the first detector to be in close contact with the borehole wall, thus avoiding monitoring errors.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A rock and soil wave velocity tester includes a main unit, which is connected to a seismic source and a first detector via a connecting cable. The first detector includes a detector assembly and a support assembly, with the support assembly disposed at the lower part of the detector assembly.

[0007] The support assembly includes a base, a support cylinder, a first connecting rod, a second connecting rod, a housing, a support plate, a sleeve, and a linear electric cylinder. The support cylinder is fixedly mounted on the base, and the linear electric cylinder is fixedly mounted inside the support cylinder. The sleeve is a cylindrical structure with one end closed, and the sleeve is fitted onto the upper end of the support cylinder through the open end of the other end. The inner side of the closed end of the sleeve is fixedly connected to the linear guide rod of the linear electric cylinder. The housing covers the support cylinder and the sleeve. The lower part of the housing is connected to the base, and the upper part is connected to the detector assembly. Multiple movable slots are provided on the housing body, arranged along the axial direction of the housing body. The number of support plates is consistent with the number of movable slots and is located on the periphery of the housing. The first connecting rod and the second connecting rod pass through the movable slots. One end of the first connecting rod is hinged to the sleeve, and the other end is hinged to the support plate. One end of the second connecting rod is rotatably connected to the support cylinder, and the other end is rotatably connected to the support plate.

[0008] In a preferred rock and soil wave velocity tester, there are two movable grooves, two first connecting rods, and two sets of second connecting rods, with multiple second connecting rods in each set arranged axially along the support cylinder.

[0009] In a preferred rock and soil wave velocity tester, a storage groove is provided at the lower part of the movable groove of the outer shell, and the size of the storage groove is larger than the size of the support rod.

[0010] In a preferred rock and soil wave velocity tester, the upper part of the outer shell is provided with an external thread, and the lower part of the detector assembly is provided with an internal thread. The outer shell is correspondingly mounted on the lower part of the detector assembly through the threads.

[0011] In a preferred rock and soil wave velocity tester, the included angle formed by the two first connecting rods, the two sets of second connecting rods, and the two movable grooves in the transverse plane of the support cylinder is 120 degrees.

[0012] In a preferred rock and soil wave velocity tester, the main unit is electrically connected to a linear electric cylinder.

[0013] In a preferred rock and soil wave velocity tester, the first and second connecting rods are connected to the other components by hinges.

[0014] In a preferred rock and soil wave velocity tester, a connection hole is also provided at the bottom of the base, and a second detector is connected to the connection hole.

[0015] In a preferred geotechnical wave velocity tester, the second detector is electrically connected to the main unit.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows: The first detector in this wave velocity tester is divided into two parts: the upper part is the detector assembly, and the lower part is the support assembly. The support assembly includes a base, a support cylinder, a housing, a first connecting rod, a second connecting rod, a sleeve, and a linear electric cylinder. The sleeve is fixedly connected to the base, and a linear electric cylinder is fixedly installed on it. A sleeve is fixedly connected to the upper part of the linear guide rod, and the sleeve is sleeved on the support cylinder. The first connecting rod is hinged on the sleeve, and the second connecting rod is hinged on the support cylinder. A support plate is hinged to the other end of the first and second connecting rods. A movable groove is opened on the housing, and the sleeve and support cylinder are set inside the housing. The linear electric cylinder drives the sleeve, and the sleeve drives the support plate to extend or retract from the housing through the first connecting rod. The setting of the support component allows the first detector to fit tightly against the borehole wall, avoiding detection errors. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the structure of the first detector of this utility model;

[0020] Figure 3 This is a schematic diagram of the overall structure of the support component in this utility model;

[0021] Figure 4 This is a schematic diagram of the structure of the outer shell of the support component in this utility model;

[0022] Figure 5 This is a schematic diagram of the internal structure of the support component of this utility model;

[0023] Figure 6 This is a schematic diagram of the internal structure of the support cylinder of this utility model.

[0024] Reference numerals: 1. Main unit; 2. Vibration source; 3. First detector; 4. Connecting line; 5. Detector assembly; 6. Support assembly; 61. Base; 62. Housing; 621. Movable slot; 622. Storage slot; 63. Support plate; 64. First connecting rod; 65. Second connecting rod; 66. Sleeve; 67. Support cylinder; 68. Linear electric cylinder; 69. Connecting hole; 7. Second detector. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0026] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0027] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0028] like Figures 1-6As shown, a rock and soil wave velocity tester includes a main unit 1. The main unit 1 is connected to a seismic source 2 and a first detector 3 via a connecting cable 4. The first detector 3 has a detector assembly 5 on its upper part and a support assembly 6 on its lower part. The support assembly 6 includes a base 61, a support cylinder 67, a shell 62, a first connecting rod 64, a second connecting rod 65, a sleeve 66, and a linear electric cylinder 68. The sleeve 66 is a hollow cylindrical shape and is fixedly connected to the base 61. A linear electric cylinder 68 is fixedly installed in the upper part of the sleeve 66. The cylinder 66 has two sets of hinge holes on its body, with an included angle of 120 degrees between them. Each set consists of two hinge holes axially positioned on the cylinder body. The linear electric cylinder 68 is electrically connected to the main unit 1, which controls the extension or retraction of the linear guide rod of the linear electric cylinder 68. A sleeve 66 is fixedly connected to the upper part of the linear guide rod. The sleeve 66 is a hollow cylinder with one end closed. The inner diameter of the sleeve 66 is larger than the outer diameter of the support cylinder 67. The sleeve 66 fits onto... On the support cylinder 67, two hinge holes are provided on the cylinder wall of the sleeve 66 at the end away from the sealing end. The included angle between the two hinge holes on the sleeve 66 is 120 degrees. A first connecting rod 64 is hinged to the hinge hole of the sleeve 66, and a second connecting rod 65 is hinged to the hinge hole of the support cylinder 67. A support plate 63 is hinged to the other end of the first connecting rod 64 and the second connecting rod 65. The outer shell 62 is provided with two movable grooves 621, which are opened along the axial direction of the outer shell 62. The included angle of the movable slot 621 on the outer shell 62 is 120 degrees; the sleeve 66 and the support cylinder 67 are set inside the outer shell 62; the first connecting rod 64 and the second connecting rod 65 extend out of the outer shell 62 and are hinged to the support plate 63; the linear electric cylinder 68 drives the sleeve 66; the sleeve 66 drives the support plate 63 to extend or retract from the outer shell 62 through the first connecting rod 64; the outer shell 62 is provided with a storage slot 622; when the support plate 63 is retracted, the storage slot 622 can accommodate the support plate 63, reducing the space occupied by the first detector 3.

[0029] The upper part of the housing 62 is provided with external threads, and the lower part of the housing 62 of the detector assembly 5 is provided with internal threads. The support assembly 6 is connected to the detector assembly 5 through threads. This arrangement facilitates the disassembly and maintenance of the support assembly 6.

[0030] The support component 6 can be directly controlled by the host 1. When wave velocity detection is required, the host 1 controls the linear electric cylinder 68 to extend, driving the sleeve 66 away from the support cylinder 67. The support cylinder 67 drives the support plate 63 to extend out of the outer shell 62 through the first connecting rod 64. The two support plates 63 press against the hole wall and make the first detector 3 stick tightly to the hole wall, preventing the detector component 5 from failing to stick tightly to the hole wall, which would cause errors in the detection results.

[0031] A rock and soil wave velocity tester, the usage steps are as follows:

[0032] S1. Place the main unit 1 of the rock and soil wave velocity tester next to the borehole, put the connecting line 4, which connects the source 2 and the first detector 3, into the borehole, adjust the length of the connecting line 4 so that the first detector 3 reaches the height to be measured, the main unit 1 controls the linear guide rod of the linear electric cylinder 68 to extend, the sleeve 66 fixed on the guide rod slides away from the support cylinder 67, the sleeve 66 drives the support plate 63 to extend through the first connecting rod 64 so that the first detector 3 is tightly attached to the borehole wall.

[0033] S2. The host 1 supplies pulse current to the source 2. The source 2 acts on the nearby soil layer, causing the soil layer to vibrate. The host 1 collects the signal from the first detector 3 and calculates the wave velocity V = S / ΔT based on the time ΔT between the return signal and the vibration and the distance S between the first detector 3 and the source 2.

[0034] S3. The linear guide rod of the linear electric cylinder 68 controlled by the host 1 retracts out, the sleeve 66 slides towards the support cylinder 67, driving the support plate 63 to retract into the storage groove 622, the support force disappears, and the connecting line 4 connecting the vibration source 2 and the first detector 3 is lifted and retracted.

[0035] Example 2:

[0036] like Figure 5 and Figure 1 As shown, the difference between this embodiment and embodiment one is that: a connection hole 69 is provided at the lower part of the base 61, and a second detector 7 with a certain height difference from the first detector is connected at the connection hole 69. The host 1 calculates the rock and soil wave velocity based on the height difference ΔH between the first detector 3 and the second detector 7 and the signal time difference Δt.

[0037] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A rock and soil wave velocity tester, comprising a main unit (1), wherein the main unit (1) is connected to a seismic source (2) and a first detector (3) via a connecting line (4), characterized in that: The first detector (3) includes a detector assembly (5) and a support assembly (6), wherein the support assembly (6) is disposed at the lower part of the detector assembly (5); The support assembly (6) includes a base (61), a support cylinder (67), a first connecting rod (64), a second connecting rod (65), a housing (62), a support plate (63), a sleeve (66), and a linear electric cylinder (68). The support cylinder (67) is fixedly mounted on the base (61), and the linear electric cylinder (68) is fixedly mounted inside the support cylinder (67). The sleeve (66) is a cylindrical structure with one end sealed. The sleeve (66) is fitted onto the upper end of the support cylinder (67) through the opening at the other end. The inner side of the sealed end of the sleeve (66) is fixedly connected to the linear guide rod of the linear electric cylinder (68). The housing (62) covers the support cylinder (67) and the sleeve (66). The lower part is connected to the base (61), and the upper part is connected to the detector assembly (5). The outer shell (62) is provided with a movable groove (621). There are multiple movable grooves (621) and they are arranged along the axial direction of the outer shell (62). The number of support plates (63) is the same as the number of movable grooves (621) and they are located on the periphery of the outer shell (62). The first connecting rod (64) and the second connecting rod (65) pass through the movable groove (621). One end of the first connecting rod (64) is hinged to the sleeve (66) and the other end is hinged to the support plate (63). One end of the second connecting rod (65) is rotatably connected to the support cylinder (67) and the other end is rotatably connected to the support plate (63).

2. The rock and soil wave velocity tester according to claim 1, characterized in that: There are two movable slots (621), two first connecting rods (64), and two sets of second connecting rods (65), with multiple second connecting rods (65) in each set.

3. The rock and soil wave velocity tester according to claim 1, characterized in that: The lower part of the movable slot (621) is provided with a storage slot (622), the size of which is larger than that of the support plate (63).

4. The rock and soil wave velocity tester according to claim 1, characterized in that: The upper part of the outer casing (62) is provided with an external thread, and the lower part of the detector assembly (5) is provided with an internal thread. The outer casing (62) is provided at the lower part of the detector assembly (5) by a threaded connection.

5. A rock and soil wave velocity tester according to claim 2, characterized in that: The two first connecting rods (64), the two sets of second connecting rods (65), and the two movable grooves (621) form an angle of 120 degrees in the transverse plane of the support cylinder (67).

6. The rock and soil wave velocity tester according to claim 1, characterized in that: The host (1) is electrically connected to the linear electric cylinder (68).

7. A rock and soil wave velocity tester according to claim 2, characterized in that: The first link (64) and the second link (65) are connected to the other components by hinges.

8. A rock and soil wave velocity tester according to claim 1, characterized in that: The base (61) is also provided with a connection hole at the bottom, and the connection hole is connected to a second detector (7).

9. A rock and soil wave velocity tester according to claim 8, characterized in that: The second detector (7) is electrically connected to the host.

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