阅读说明：本技术 一种跨孔超声波法探测地下管道埋深的方法 (Method for detecting buried depth of underground pipeline by cross-hole ultrasonic method ) 是由 楼国长 孙红心 沈晓武 张秉政 刘敏 胡臻荣 张鹏 张鑫 郑慧华 吴斌 陈春飞 于 2020-05-29 设计创作，主要内容包括：本发明涉及一种跨孔超声波法探测地下管道埋深的方法,涉及岩土工程的技术领域,其包括：S1,初步探测地下管道位置和埋深；S2,钻机成孔,在地下管道的两侧钻孔；S3,埋设声测管,将两个声测管一一对应埋设于地下管道两侧的钻孔中,声测管互相平行；S4,测点,沿声测管的轴向选取若干声测点,将超声波检测分析仪的接收换能器与发射换能器分别放置于两个声测管内,测量若干声测点的超声波声速和波幅；S5,地下管道深度计算,以声测点为纵轴,以声测点对应的声速和波幅为横轴生成超声波波列图,根据超声波波列图计算出地下管道的埋深。本发明具有适用范围较广,能够探测较大埋深的地下管道的埋设深度的效果。(The invention relates to a method for detecting the buried depth of an underground pipeline by a cross-hole ultrasonic method, which relates to the technical field of geotechnical engineering and comprises the following steps: s1, primarily detecting the position and the buried depth of the underground pipeline; s2, drilling holes by a drilling machine, and drilling holes on two sides of the underground pipeline; s3, embedding the sound measuring tubes, and embedding the two sound measuring tubes in the drill holes on the two sides of the underground pipeline in a one-to-one correspondence mode, wherein the sound measuring tubes are parallel to each other; s4, measuring points, namely selecting a plurality of sound measuring points along the axial direction of the sound measuring tubes, respectively placing a receiving transducer and a transmitting transducer of an ultrasonic detection analyzer in the two sound measuring tubes, and measuring the ultrasonic sound velocity and the amplitude of the sound measuring points; and S5, calculating the depth of the underground pipeline, generating an ultrasonic wave train diagram by taking the acoustic measurement point as a vertical axis and taking the sound velocity and the wave amplitude corresponding to the acoustic measurement point as a horizontal axis, and calculating the burial depth of the underground pipeline according to the ultrasonic wave train diagram. The invention has the advantages of wide application range and capability of detecting the embedding depth of the underground pipeline with larger embedding depth.)

1. A method for detecting the buried depth of an underground pipeline by a cross-hole ultrasonic method is characterized by comprising the following steps:

s1, primarily detecting the position and the buried depth of the underground pipeline (1);

s2, drilling holes by a drilling machine, and drilling holes (2) on two sides of the underground pipeline;

s3, embedding the sounding pipes (3), and embedding the two sounding pipes (3) in the drill holes (2) on the two sides of the underground pipeline one by one, wherein the sounding pipes (3) are parallel to each other;

s4, measuring points, namely selecting a plurality of sound measuring points along the axial direction of the sound measuring tubes (3), respectively placing a receiving transducer (41) and a transmitting transducer (42) of an ultrasonic detection analyzer (4) in the two sound measuring tubes (3), and measuring the ultrasonic sound velocity and the amplitude of the sound measuring points;

and S5, calculating the depth of the underground pipeline, generating an ultrasonic wave train diagram by taking the acoustic measurement point as a vertical axis and taking the sound velocity and the wave amplitude corresponding to the acoustic measurement point as a horizontal axis, and calculating the burial depth of the underground pipeline according to the ultrasonic wave train diagram.

2. The method for detecting the buried depth of the underground pipeline by the cross-hole ultrasonic method according to claim 1, wherein the method comprises the following steps: in S3, the sounding pipe (3) is made of a PVC pipe or an iron pipe.

3. The method for detecting the buried depth of the underground pipeline by the cross-hole ultrasonic method according to claim 1, wherein the method comprises the following steps: in S3, the outer diameter of the sound measuring tube (3) is 50mm-76mm, and the inner diameter of the sound measuring tube (3) is 40mm-55 mm.

4. The method for detecting the buried depth of the underground pipeline by the cross-hole ultrasonic method according to claim 1, wherein the method comprises the following steps: in S3, a sealing plate (31) is integrally arranged at the lower end of the sounding pipe (3), and a cover plate (32) is arranged at the upper end of the sounding pipe (3).

5. The method for detecting the buried depth of the underground pipeline by the cross-hole ultrasonic method according to claim 1, wherein the method comprises the following steps: in S4, the distance between adjacent acoustic measurement points is not more than 10 cm.

6. The method for detecting the buried depth of the underground pipeline by the cross-hole ultrasonic method according to claim 1, wherein the method comprises the following steps: in S4, a guide fixed pulley (5) is arranged on the ground close to the pipe orifice of the sounding pipe (3), an electronic meter counter (6) is further arranged on one side, far away from the sounding pipe (3), of the guide fixed pulley (5), and a connecting wire (43) of a receiving transducer (41) and a transmitting transducer (42) of the ultrasonic detection analyzer (4) sequentially extends into the sounding pipe (3) through the electronic meter counter (6) and the guide fixed pulley (5);

and a spool of the ultrasonic detection analyzer (4) is wound and unwound by an electronic meter counter (6).

7. The method for detecting the buried depth of the underground pipeline by the cross-hole ultrasonic method according to claim 1, wherein the method comprises the following steps: in S3, a clamping assembly (7) is connected to the inside of the sound measuring tube (3) in a sliding manner;

the clamping assembly (7) comprises a base plate (71) connected in the sounding pipe (3) in a sliding mode, a supporting plate (72) integrally arranged at one end of the base plate (71), a clamping plate (73) connected on the base plate (71) in a sliding mode and matched with the supporting plate (72) to clamp the receiving transducer (41) or the transmitting transducer (42), and an elastic piece (74) arranged between the supporting plate (72) and the clamping plate (73).

8. The method for detecting the buried depth of the underground pipeline by the cross-hole ultrasonic method according to claim 7, wherein the method comprises the following steps: a sliding block (712) is arranged on one side, away from the supporting plate (72), of the base plate (71), a guide rail (33) is integrally arranged on the inner side wall of the sounding pipe (3), and the sliding block (712) is connected to the guide rail (33) in a sliding manner;

the supporting plates (72) on the two base plates (71) are oppositely arranged.

9. The method for detecting the buried depth of the underground pipeline by the cross-hole ultrasonic method according to claim 7, wherein the method comprises the following steps: the clamping device is characterized in that a sliding rail (711) is arranged on one side, close to the clamping plate (73), of the base plate (71), a sliding groove (731) is formed in the clamping plate (73), and the sliding rail (711) penetrates through the sliding groove (731) and is connected with the sliding groove (731) in a sliding mode.

10. The method for detecting the buried depth of the underground pipeline by the cross-hole ultrasonic method according to claim 7, wherein the method comprises the following steps: the utility model discloses a supporting plate, including backup pad (72), supporting plate (72) are close to the one side of grip block (73) and are seted up the one end that supplies receiving transducer (41) or transmitting transducer (42) and inlay constant head tank (721) of establishing, grip block (73) are close to one side of backup pad (72) and are seted up the other end that supplies receiving transducer (41) or transmitting transducer (42) and inlay groove (732) of establishing.

Technical Field

The invention relates to the technical field of geotechnical engineering, in particular to a method for detecting the buried depth of an underground pipeline by a cross-hole ultrasonic method.

Background

Underground pipelines are regarded as life lines of cities, are important infrastructures of the cities, and are used for transmitting information, conveying energy and discharging waste liquid. The cities are developed towards functional cities basically nowadays, and the density of underground pipelines can reflect the functionality of one city from one side. For historical reasons, underground pipe networks of many cities in China are not distributed clearly, the file data management is not standard enough, and underground pipe networks of some factory and mine enterprises are laid even without completion drawings. These all bring many difficulties to the construction and reconstruction of towns and industrial and mining enterprises and the use and maintenance of pipelines. With the development of reform and open and economic construction in China, serious accidents such as casualties, water cut-off, power failure and the like caused by pipeline damage in the construction process are frequent. In order to prevent the underground pipeline facilities from being damaged in the construction process, the detection of the underground pipeline becomes an indispensable precondition for construction, and the detection of the underground pipeline has very important significance for normal operation, transformation and extension of cities.

At present, in China, geophysical prospecting methods for the plane position and the buried depth of underground pipelines mainly comprise a ground penetrating radar method, a high-density resistivity method, a sound wave transmission method, an electromagnetic method, an inertial gyroscope measuring method, a tracing electromagnetic method, a shallow seismic wave method, an infrared radiation method, a high-pressure water gun flushing method and the like.

The pipeline is made of concrete, the resistivity of the pipeline is far higher than that of surrounding rocks, and high-resistance abnormity is easily formed, so that the pipe top of the sewer pipeline is discovered by a high-density electrical method; however, the high-density electrical method is a volume detection method, and if the burial depth of the target body is too large or the diameter of the pipeline is too small, the detection effect is affected, and even the detection cannot be realized.

When the underground pipeline is detected by adopting an electromagnetic method, the detection error of the underground pipeline is increased or even cannot be detected under the condition that the buried depth is increased due to the limitation of site conditions, pipeline materials and pipeline buried depth; the electromagnetic method is only suitable for detecting the underground pipeline with an access, and the probe can freely pass through the underground pipeline in the pipeline

The ground penetrating radar can well detect a shallow buried underground pipeline, has the characteristics of rapidness, high efficiency, no damage, real-time display of underground images and the like when detecting a nonmetal pipeline, but has small detection depth and large investment when the formation resistivity is low, and meanwhile, the setting parameters and the like must be reasonably selected; however, the method is greatly influenced by environment and underground media, and requires specific operators to have stronger theoretical level and practical experience, and meanwhile, the method is difficult to accurately detect the plane position and the burial depth of the pipeline with larger burial depth, and a plurality of places worth knocking exist in theoretical and practical operation.

The method is suitable for detecting pipelines with shallow buried depth and large pipe diameter, and is greatly limited by site conditions, pipe diameter and pipeline buried depth.

The above prior art solutions have the following drawbacks: the above geophysical prospecting methods all have certain effect, but each method has certain limitation in application, and especially for correctly detecting various pipeline buried depths with the buried depth being more than 5m, an effective geophysical prospecting method technology is lacked.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a method for detecting the buried depth of an underground pipeline by a cross-hole ultrasonic method, which has a wider application range and can detect the buried depth of the underground pipeline with larger buried depth.

The above object of the present invention is achieved by the following technical solutions:

a method for detecting the buried depth of an underground pipeline by a cross-hole ultrasonic method comprises the following steps:

s1, primarily detecting the position and the buried depth of the underground pipeline;

s2, drilling holes by a drilling machine, and drilling holes on two sides of the underground pipeline;

s3, embedding the sound measuring tubes, and embedding the two sound measuring tubes in the drill holes on the two sides of the underground pipeline in a one-to-one correspondence mode, wherein the sound measuring tubes are parallel to each other;

s4, measuring points, namely selecting a plurality of sound measuring points along the axial direction of the sound measuring tubes, respectively placing a receiving transducer and a transmitting transducer of an ultrasonic detection analyzer in the two sound measuring tubes, and measuring the ultrasonic sound velocity and the amplitude of the sound measuring points;

and S5, calculating the depth of the underground pipeline, generating an ultrasonic wave train diagram by taking the acoustic measurement point as a vertical axis and taking the sound velocity and the wave amplitude corresponding to the acoustic measurement point as a horizontal axis, and calculating the burial depth of the underground pipeline according to the ultrasonic wave train diagram.

By adopting the technical scheme, the buried depth of the underground pipeline under different conditions can be measured, the application range is wider, and meanwhile, the buried depth of the underground pipeline with larger buried depth, namely the buried depth larger than 5m, can be detected.

The present invention in a preferred example may be further configured to: and S3, the sounding pipe is made of a PVC pipe or an iron pipe.

The present invention in a preferred example may be further configured to: in S3, the outer diameter of the sounding pipe is 50mm-76mm, and the inner diameter of the sounding pipe is 40mm-55 mm.

The present invention in a preferred example may be further configured to: and S3, a sealing plate is integrally arranged at the lower end of the sounding pipe, and a cover plate is arranged at the upper end of the sounding pipe.

By adopting the technical scheme.

The present invention in a preferred example may be further configured to: in S4, the distance between adjacent acoustic measurement points is not more than 10 cm. .

By adopting the technical scheme.

The present invention in a preferred example may be further configured to: in S4, a guide fixed pulley is arranged on the ground close to the mouth of the sounding pipe, an electronic meter counter is further arranged on one side of the guide fixed pulley far away from the sounding pipe, and a connecting lead of a receiving transducer and a transmitting transducer of the ultrasonic detection analyzer sequentially extends into the sounding pipe through the electronic meter counter and the guide fixed pulley;

and a spool of the ultrasonic detection analyzer receives and releases wires through an electronic meter counter.

By adopting the technical scheme, the electronic meter counter measures the length of the connecting lead extending into the sound measuring pipe so as to control the motor to drive the spool to take up and pay off, thereby improving the accuracy of the depth of the sound measuring point and the accuracy of underground pipeline buried depth measurement.

The present invention in a preferred example may be further configured to: in S3, a clamping assembly is connected in the acoustic pipe in a sliding manner;

the centre gripping subassembly including slide connect in the intraductal base plate of acoustic survey, integrative backup pad of locating base plate one end, slide connect on the base plate and cooperate the backup pad centre gripping to receive the grip block of transducer or transmission transducer and locate the elastic component between backup pad and the grip block.

By adopting the technical scheme, the receiving transducer and the transmitting transducer are not easy to collide and abrade with the sounding pipe when sliding in the sounding pipe, and the service lives of the receiving transducer and the transmitting transducer are prolonged; meanwhile, the receiving transducer and the transmitting transducer are not easy to shake in the acoustic pipe, the accuracy of the depth of an acoustic point is improved, and the accuracy of underground pipeline buried depth measurement is improved.

The present invention in a preferred example may be further configured to: a sliding block is arranged on one side of the substrate, which is far away from the supporting plate, a guide rail is integrally arranged on the inner side wall of the sounding pipe, and the sliding block is connected to the guide rail in a sliding manner;

the supporting plates on the two substrates are oppositely arranged.

Through adopting above-mentioned technical scheme, the slider is connected with sliding of guided way, makes the base plate only slide along vertical direction, and difficult the emergence is rocked, and then makes receiving transducer and transmitting transducer difficult the emergence when going up and down in the sounding pipe rock, has improved the accuracy nature of the degree of depth of sounding point, has improved underground pipeline buried depth measuring accuracy nature.

The present invention in a preferred example may be further configured to: one side of the base plate close to the clamping plate is provided with a sliding rail, a sliding groove is formed in the clamping plate, and the sliding rail penetrates through the sliding groove and is connected with the sliding groove in a sliding mode.

Through adopting above-mentioned technical scheme, the slide rail is worn to locate in the spout and is slided with the grip block and be connected, makes the grip block only slide in vertical direction, and difficult taking place rocking and the circumference wrench movement of horizontal direction, has improved the stability when the grip block slides, has improved the fastness that transducer or transmitting transducer were received to grip block and backup pad centre gripping simultaneously.

The present invention in a preferred example may be further configured to: the utility model discloses a support plate, including backup pad, transducer, transmission transducer, supporting plate, supporting.

Through adopting above-mentioned technical scheme, make receiving transducer and transmitting transducer both ends can insert the constant head tank respectively and inlay and establish the groove and fix a position, make receiving transducer and transmitting transducer be difficult for taking place relative slip with backup pad and grip block, improved the fastness that transducer and transmitting transducer were received in grip block and backup pad centre gripping.

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

1. the method has wide application range and can detect the embedding depth of the underground pipeline with larger embedding depth;

2. the receiving transducer and the transmitting transducer are not easy to shake and twist in the acoustic sounding pipe, and the accuracy of underground pipeline buried depth measurement is improved.

Drawings

Fig. 1 is a detection schematic diagram of a method for detecting the buried depth of an underground pipeline by a cross-hole ultrasonic method.

Fig. 2 is an ultrasonic wave oscillogram.

Fig. 3 is a schematic full-section view of a sonotrode.

Fig. 4 is a schematic partial exploded view of the cover plate and clamping assembly, sonic tube.

FIG. 5 is a schematic view of the substrate, the supporting plate and the clamping plate in full section.

FIG. 6 is an exploded view of the first tile and the second tile.

In the figure, 1, underground pipelines; 2. drilling; 3. a sound detection tube; 31. closing the plate; 32. a cover plate; 321. a first splice plate; 3211. a first plug-in block; 3212. a plug-in sheet; 322. a second splice plate; 3221. a second insertion block; 3222. inserting grooves; 33. a guide rail; 4. an ultrasonic detection analyzer; 41. a receiving transducer; 42. a transmitting transducer; 43. connecting a lead; 5. a guide fixed pulley; 6. an electronic meter counter; 7. a clamping assembly; 71. a substrate; 711. a slide rail; 712. a slider; 72. a support plate; 721. positioning a groove; 73. a clamping plate; 731. a chute; 732. embedding a groove; 74. an elastic member.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Referring to fig. 1, the method for detecting the buried depth of an underground pipeline 1 by a cross-hole ultrasonic method disclosed by the invention comprises the following steps:

s1, detecting the position of the underground pipeline 1, and determining the approximate plane position of the underground pipeline 1; the plane position is the vertical projection of the underground pipeline 1 on the ground, and the approximate plane position of the underground pipeline 1 can be determined according to the existing data, can be determined by means of an electromagnetic detection method and the like, and can also be determined by combining the existing data and the electromagnetic detection method.

S2, forming holes by a drilling machine, preliminarily estimating the diameter of the underground pipeline 1 according to existing data or an electromagnetic detection method, drilling holes 2 at two sides of the underground pipeline 1 by using the drilling machine, wherein the depth of each drilling hole 2 is larger than the buried depth of the underground pipeline 1 deduced according to the existing data, the two drilling holes 2 are vertically arranged, the diameter of each drilling hole 2 is 76mm-110mm, and the distance between the two drilling holes 2 is larger than the sum of the diameter of the underground pipeline 1 and the diameter of each drilling hole 2; when the holes 2 are drilled, the distance between the two drilled holes 2 is increased by a certain margin on the basis of the sum of the diameter of the underground pipeline 1 and the diameter of the drilled holes 2, and the margin is 5cm-60 cm.

S3, embedding the sounding pipes 3, embedding the two sounding pipes 3 in the drill holes 2 on two sides of the underground pipeline 1 in a one-to-one correspondence mode, enabling the two sounding pipes 3 to be parallel to each other, enabling the two sounding pipes 3 to be vertically arranged, enabling the outer diameter of each sounding pipe 3 to be 50-76 mm, enabling the inner diameter of each sounding pipe 3 to be 40-55 mm, enabling the sounding pipes 3 to be made of PVC pipes or iron pipes, and enabling foreign matters to be not in the sounding pipes 3.

S4, selecting a plurality of sound measuring points along the axial direction of the sound measuring tube 3, wherein the sound measuring points are vertically and uniformly distributed, and the distance L between every two adjacent sound measuring points is not more than 10 cm; the receiving transducer 41 and the transmitting transducer 42 of the ultrasonic detection analyzer 4 are respectively placed at the positions of corresponding acoustic measurement points in the two acoustic measurement tubes 3, and the sound velocity and the amplitude of the ultrasonic waves at the acoustic measurement points are measured.

And S5, calculating the depth of the underground pipeline 1, generating an ultrasonic wave train diagram by taking the depth corresponding to the acoustic measurement points as a longitudinal axis and taking the sound velocity and the wave amplitude corresponding to the acoustic measurement points as a transverse axis, and calculating the burial depth of the underground pipeline 1 according to the ultrasonic wave train diagram, wherein the diagram is shown in figure 2.

Referring to fig. 1, a guide fixed pulley 5 is arranged on the ground close to the orifice of the sounding pipe 3, and the guide fixed pulley 5 is arranged on the upper room of the sounding pipe 3, so that a connecting wire 43 extending into the receiving transducer 41 and the transmitting transducer 42 in the sounding pipe 3 is vertically arranged; an electronic meter counter 6 is further arranged on the ground close to the pipe opening of the sounding pipe 3, the electronic meter counter 6 is arranged on one side, away from the sounding pipe 3, of the guide fixed pulley 5, the connecting wires 43 of the receiving transducer 41 and the transmitting transducer 42 are controlled to be stored and released through motors, the connecting wires 43 are controlled by the motors, the wire shafts of the connecting wires 43 are collinear with the electronic meter counter 6, the guide fixed pulley 5 and the sounding pipe 3, and the wire shafts of the connecting wires 43 are arranged on one side, away from the guide fixed pulley 5, of the electronic meter counter 6.

When the ultrasonic sound measuring device is used, the connecting conducting wire 43 sequentially passes through the electronic meter counter 6 and the guide fixed pulley 5 from the spool and finally extends into the sound measuring tube 3, the electronic meter counter 6 is used for measuring the length of the connecting conducting wire 43 extending into the sound measuring tube 3, and the motor is controlled according to a set value to drive the spool to receive and release the connecting conducting wire 43, so that the sound velocity and the amplitude of ultrasonic waves of each sound measuring point can be conveniently measured.

Referring to fig. 3, a sealing plate 31 is integrally provided at the lower end of the sounding pipe 3, so that groundwater is not likely to enter the sounding pipe 3; the acoustic pipe 3 is further internally provided with a clamping assembly 7, and the clamping assembly 7 is used for clamping and fixing the receiving transducer 41 or the transmitting transducer 42, so that the receiving transducer 41 and the transmitting transducer 42 are not easy to collide with the outer side wall of the acoustic pipe 3.

Referring to fig. 4, the clamping assembly 7 includes a base plate 71, a support plate 72, a clamping plate 73, and an elastic member 74; the base plate 71 is connected in the sounding pipe 3 in a sliding manner, and the base plate 71 is vertically arranged; the support plate 72 may be integrally formed on the upper end of the base plate 71 or integrally formed on the lower end of the base plate 71, where the support plate 72 is preferably integrally formed on the lower end of the base plate 71, and the support plate 72 is perpendicular to the base plate 71; the clamping plate 73 and the supporting plate 72 are located on the same side of the base plate 71, a sliding rail 711 is fixed on one side of the base plate 71 close to the clamping plate 73 through a screw, the sliding rail 711 is vertically arranged, a sliding groove 731 is formed in one side of the clamping plate 73 close to the base plate 71, the sliding rail 711 is arranged in the sliding groove 731 in a penetrating manner and is connected with the clamping plate 73 in a sliding manner, and the clamping plate 73 is matched with the supporting plate 72 to clamp and fix the receiving transducer 41 or the transmitting transducer 42; the elastic member 74 is used to drive the clamping plate 73 to slide along the sliding rail 711 to a side close to the supporting plate 72, so that the clamping plate 73 and the supporting plate 72 cooperate to clamp and fix the receiving transducer 41 or the transmitting transducer 42, where the elastic member 74 may be a stretch rope, a torsion spring, or a tension spring, where the elastic member 74 is preferably a tension spring, and one end of the tension spring is connected to the supporting plate 72 and the other end is connected to the clamping plate 73.

A slide block 712 is arranged on one side of the base plate 71 away from the clamping plate 73, the slide block 712 can be integrally arranged with the base plate 71 and can also be detachably connected with the base plate 71, and the slide block 712 is preferably detachably connected with the base plate 71 through a screw; the guide rail 33 is integrally arranged on the inner side wall of the sounding pipe 3, the guide rail 33 is vertically arranged, the cross section of the guide rail 33 can be in a T shape or an isosceles trapezoid shape, the sliding block 712 is connected to the guide rail 33 in a sliding manner, and the guide substrate 71 slides along the vertical direction, so that the receiving transducer 41 and the transmitting transducer 42 are not easy to shake or twist when lifting in the sounding pipe 3, and the accuracy of the ultrasonic detector in measuring the buried depth of the underground pipeline 1 is improved; when the sliding block 712 is slidably connected to the guide rail 33, the supporting plates 72 on the base plate 71 in the two sounding pipes 3 are oppositely arranged.

Referring to fig. 5, a positioning groove 721 is formed on the upper side of the supporting plate 72, the positioning groove 721 is concentric with the sounding pipe 3, and the positioning groove 721 is used for inserting and positioning the lower end of the receiving transducer 41 or the transmitting transducer 42; the clamping plate 73 is provided with an embedding groove 732 on the lower side thereof, the embedding groove 732 is used for inserting and positioning the upper end of the receiving transducer 41 or the transmitting transducer 42, the clamping plate 73 is further provided with a sliding groove, the sliding groove is communicated with the embedding groove 732, the sliding groove is arranged on one side of the clamping plate 73 far away from the substrate 71 and communicated with the side wall of the clamping plate 73 far away from the substrate 71, so that the connecting wire 43 of the receiving transducer 41 or the transmitting transducer 42 can penetrate through the sliding groove and is not easy to bend.

Referring to fig. 4 and 6, the upper end cover of the sounding pipe 3 is provided with a cover plate 32, the cover plate 32 can be made of plastic, rubber or metal, the cover plate 32 includes a first splice plate 321 and a second splice plate 322, the first splice plate 321 and the second splice plate 322 are both in semicircular arrangement, the first splice plate 321 and the second splice plate 322 are both in concentric arrangement with the sounding pipe 3, the radii of the first splice plate 321 and the second splice plate 322 are equal and larger than the inner diameter of the sounding pipe 3, a through groove for the connecting wire 43 to penetrate through is provided on one side of the first splice plate 321 close to the second splice plate 322 and one side of the second splice plate 322 close to the first splice plate 321, the radial cross section of the through groove is in semicircular arrangement, and the two through grooves are combined to form a round hole.

The downside of first splice plate 321 is integrative to be equipped with first grafting piece 3211, and the downside of second splice plate 322 is integrative to be equipped with second grafting piece 3221, and first grafting piece 3211 all is the internal diameter that half-disk-shaped set up and radius equals sounding pipe 3 with second grafting piece 3221, and first grafting piece 3211 all is concentric setting with sounding pipe 3 with second grafting piece 3221, pegs graft in sounding pipe 3 after first grafting piece 3211 splices with second grafting piece 3221.

One side of the first splicing plate 321 close to the second splicing plate 322 is integrally provided with at least one splicing piece 3212, the number of the splicing pieces 3212 is preferably two, the two splicing pieces 3212 are symmetrically arranged on two sides of the through groove, and one side of the second splicing plate 322 close to the first splicing plate 321 is provided with a splicing groove 3222 for the splicing of the splicing pieces 3212, so that the first splicing plate 321 and the second splicing plate 322 are spliced into a circle, and the first splicing plate 321 and the second splicing plate 322 are not easy to dislocate when being covered on the sounding pipe 3.

The implementation principle of the embodiment is as follows:

the sound wave is transmitted from one point to another point in the medium and can be transmitted along the optimal and most time-saving path; the propagation speeds of the ultrasonic waves in different media are different, and when the underground pipeline 1 is not at the height of the acoustic measurement point, the wave speed of the ultrasonic waves received by the receiving transducer 41 is kept fixed; when the underground pipeline 1 is at the height of the sound measurement point, the wave velocity of the ultrasonic wave received by the receiving transducer 41 changes, and the buried depth of the underground pipeline 1 can be obtained by calculating the depth corresponding to the sound measurement point where the wave velocity of the ultrasonic wave received by the receiving transducer 41 changes.

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