Building underground pipeline engineering detection device

Abstract

The invention discloses a building underground pipeline engineering detection device, and relates to the technical field of pipeline detection. The device comprises a mounting column, advancing assemblies are arranged on the peripheries of the left side and the right side of the mounting column, the advancing assemblies are used for driving the mounting column to move in the underground pipeline, a motor is fixedly mounted on the right side of the mounting column, the right end of the motor is in transmission connection with a vortex tooth disc, and a cleaning assembly is arranged at the right end of the vortex tooth disc. And the cleaning assembly is used for cleaning the inner wall of the front side of the underground pipeline during moving, and a blowing assembly is arranged on the periphery of the middle of the mounting column. The device can be suitable for pipelines with different inner hole sizes, more intelligent detection is effectively achieved, manual handheld detection is not needed, more labor is saved, meanwhile, omission of manual detection is avoided, detection errors caused by judgment from the appearance are avoided, leakage of the pipelines can be displayed more visually, and the detection efficiency is improved. And meanwhile, the leakage part is marked, so that subsequent maintenance is facilitated.

Description

Technical Field

[0001] The invention relates to the technical field of pipeline detection, and in particular to a detection device for underground pipeline engineering in buildings. Background Art

[0002] In building design, in order to facilitate the transportation of gas and water, as well as the centralized layout and monitoring of lines, underground corridors are set up, and the transportation pipelines and line protection pipelines are centrally laid in the corridors. Before these underground pipelines are used, in order to avoid pipeline leakage, engineering inspections are also required to ensure the normal use of underground pipelines.

[0003] However, the existing building underground pipeline engineering detection device still has the following defects during use: 1. The existing detection device is implemented by manually moving the detection device along the pipeline during use, which is not only laborious but also prone to omissions. During the detection process, it can only be judged from the appearance whether there is a leak in the pipeline, which is prone to detection errors.

[0004] 2. Most existing intelligent detection devices use cameras to capture images of the appearance for detection, so manual observation is still required for judgment. In addition, pipeline leakage cannot be intuitively displayed and relies on the experience of the detection personnel. The leakage cannot be marked, which is not conducive to subsequent maintenance. Summary of the invention

[0005] The purpose of the present invention is to solve the problems that the above-mentioned manual handheld detection device is not only laborious, but also prone to omissions, and visual judgment is prone to detection errors, and video detection still requires manual observation for judgment, and pipeline leakage cannot be intuitively displayed, and the leakage cannot be marked, which is not conducive to subsequent maintenance. The present invention provides a building underground pipeline engineering detection device.

[0006] In order to achieve the above-mentioned purpose, the present invention specifically adopts the following technical solutions: A device for detecting underground pipeline engineering in a building comprises a mounting column, wherein travel components are arranged on the periphery of the left and right sides of the mounting column, and the travel components are used to drive the mounting column to move in the underground pipeline, a motor is fixedly installed on the right side of the mounting column, and the right end of the motor is transmission-connected to a vortex disk, and the right end of the vortex disk is provided with a cleaning component, and the cleaning component is used to clean the inner wall of the front side of the underground pipeline when moving, and a blowing component is arranged on the periphery of the middle part of the mounting column, and the blowing component is used to blow air outward from the inner wall of the underground pipeline.

[0007] Furthermore, the traveling assembly includes a mounting ring, mounting rings are fixedly installed on the periphery of the left and right sides of the mounting column, three fixing seats are evenly fixedly installed on the periphery of the mounting ring, support columns are hinged on the inner sides of the fixing seats, rollers are symmetrically connected to the two sides of the support column away from one end of the fixing seat, a slider is slidably connected to the left side of the mounting ring inside the mounting column, a transmission rod is transmission-connected between the slider and the support column, a support block is slidably connected to the left side of the slider inside the mounting column, a spring is fixedly connected between the support block and the slider, and the spring is used to enable the support block to elastically support the slider.

[0008] Furthermore, one end of the transmission rod is hinged to the middle part of the support column close to the mounting column, and the other end is tilted to the left and hinged to the outer periphery of the inner slider, so that when the slider moves left and right, the transmission rod can be used to drive the support column to shrink or expand.

[0009] Furthermore, a threaded rod is rotatably connected to the middle part of the mounting column, the threaded rod passes through the support blocks and sliders on the left and right sides, and the threaded rod is threadedly connected to the support blocks on the left and right sides. The threaded rod passes through the middle parts of the sliders on the left and right sides and does not contact the sliders. Therefore, during the rotation of the threaded rod, the support blocks on the left and right sides can be driven to move left and right at the same time. The threaded rod extends to the left to the left side of the mounting column, and a knob is fixedly installed on the left end of the threaded rod to facilitate driving the threaded rod to rotate.

[0010] Furthermore, a driving assembly is provided on the inner side of the support column in the traveling assembly on the right side, and the driving assembly is used to drive the roller on the right side to rotate. The driving assembly includes a gear connected to the middle part of the hinge between the support column on the right side and the fixed seat for limited rotation, and a belt is connected to the roller on both sides of the gear for transmission, so when the gear rotates, the roller can be driven to rotate by the belt.

[0011] Furthermore, a volute tooth is provided at the left end of the volute disk, and the volute tooth and the gear are meshed with each other, so when the volute disk rotates, all the gears can be driven to rotate synchronously.

[0012] Furthermore, the cleaning component includes a liquid storage bin, a liquid storage bin is fixedly installed on the right end of the vortex disk, cleaning liquid is stored in the liquid storage bin, a pressure pump is fixedly installed on the right end of the liquid storage bin for pressurizing the liquid storage bin, a sleeve is evenly fixedly installed on the periphery of the liquid storage bin, the internal limiting sliding connection of the sleeve is connected with a connecting rod, the connecting rod can be telescopically moved and fixed in the sleeve, and thus the outward extension length of the cleaning brush can be adjusted according to the inner hole diameter of the pipe, a connecting hose is fixedly connected between the end of the connecting rod close to the liquid storage bin and the liquid storage bin for connecting the liquid storage bin with the connecting rod, a cleaning brush is fixedly installed on the end of the connecting rod away from the liquid storage bin, and the cleaning brushes are all designed to be inclined in the same direction to facilitate the cleaning of debris on the inner wall of the pipe, and water outlet holes are provided between the brush heads of the cleaning brushes.

[0013] Furthermore, the water outlet is connected to the hollow inside of the connecting rod, and then connected to the liquid storage tank through a connecting hose, so that the cleaning liquid inside the liquid storage tank can be sprayed out from the water outlet and coated on the inner wall of the pipe through the rotating cleaning brush.

[0014] Furthermore, the blowing assembly includes a cavity, the cavity is fixedly installed on the periphery of the middle part of the mounting column, and the periphery of the cavity is evenly limited and elastically slidably connected with a jet pipe, so that the jet pipe can be telescopically adjusted according to the diameter of the inner hole of the pipe, and blowers are fixedly installed on the left and right sides of the cavity for generating air pressure inside the cavity and spraying it out from the jet pipe.

[0015] Furthermore, the jet tubes are of flat design and there are two groups of them. The two groups of jet tubes are staggered on the left and right sides of the periphery of the cavity, so that when the jet tubes move on the inner wall of the pipe, the dislocated jet tubes can fully cover the inner wall of the pipe to avoid areas where air is missed.

[0016] The beneficial effects of the present invention are as follows: 1. The present invention, through the coordinated design of the traveling component and the cleaning component, can first clean the inner wall of the pipeline to ensure the stability of movement in the pipeline and perform detection. At the same time, with the elastic support of the support column and the roller and the adjustment of the initial opening angle of the roller, it can be well applied to pipelines with different inner hole sizes, thereby effectively realizing more intelligent detection, without the need for manual hand-held detection, which is more labor-saving and avoids omissions in manual detection.

[0017] 2. The present invention, through the coordinated design of the cleaning component and the blowing component, and the movement of the installation column inside the pipeline driven by the traveling component, can detect whether the pipeline is leaking from the inside of the pipeline, avoiding detection errors caused by judging from the appearance.

[0018] 3. The present invention, through the coordinated design of the cleaning component and the blowing component, can first clean the inner wall of the pipeline and apply the cleaning liquid, and then use the blowing component to spray the cleaning liquid outward from the pipeline leakage, thereby avoiding judgment through manual observation and being able to more intuitively display the pipeline leakage. At the same time, bubbles and water marks are generated at the leakage site, which is convenient for timely marking and is conducive to subsequent maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The three-dimensional structure of the present invention is shown in FIG. Figure 1 ; Figure 2 The three-dimensional structure of the present invention is shown in FIG. Figure 2 ; Figure 3 It is a schematic diagram of a partial three-dimensional structure of the present invention; Figure 4 It is a schematic diagram of a partially cutaway three-dimensional structure of the present invention; Figure 5 It is a schematic diagram of the three-dimensional structure of the right side of the mounting column of the present invention; Figure 6 It is a schematic diagram of the three-dimensional structure of the traveling assembly and the driving assembly of the present invention; Figure 7 It is a schematic diagram of the structure of a part of the traveling component and the driving component of the present invention; Figure 8 It is a schematic diagram of the three-dimensional structure of the driving component of the present invention; Fig. 9 It is a schematic diagram of the three-dimensional structure of the right side of the mounting column and the cleaning component of the present invention; Fig.10 It is a schematic diagram of the three-dimensional structure of the volute disk and the cleaning assembly of the present invention; Fig.11 It is a schematic diagram of a partially cutaway three-dimensional structure of a volute disk and a cleaning assembly of the present invention; Fig.12 It is a schematic diagram of the three-dimensional structure of the blowing assembly of the present invention.

[0020] Figure numerals: 1. Mounting column; 2. Traveling assembly; 21. Mounting ring; 22. Fixed seat; 23. Support column; 24. Roller; 25. Slider; 26. Transmission rod; 27. Support block; 28. Spring; 29. ​​Drive assembly; 291. Gear; 292. Belt; 3. Motor; 4. Vortex disc; 5. Cleaning assembly; 51. Liquid storage tank; 52. Pressure pump; 53. Sleeve; 54. Connecting rod; 55. Connecting hose; 56. Cleaning brush; 57. Water outlet; 6. Blowing assembly; 61. Cavity; 62. Jet pipe; 63. Blower; 7. Threaded rod; 71. Knob. DETAILED DESCRIPTION

[0021] To make the purpose, technical solution and advantages of the embodiments of the present invention more clear, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0022] A building underground pipeline engineering detection device according to a preferred embodiment of the present invention will be described in detail below. Figure 1-Figure 6 As shown, a building underground pipeline engineering detection device includes a mounting column 1, and a traveling component 2 is arranged on the periphery of the left and right sides of the mounting column 1. The traveling component 2 is used to drive the mounting column 1 to move in the underground pipeline. A motor 3 is fixedly installed on the right side of the mounting column 1, and a vortex plate 4 is transmission-connected to the right end of the motor 3. A cleaning component 5 is arranged on the right end of the vortex plate 4. The cleaning component 5 is used to clean the inner wall of the front side of the underground pipeline when moving. A blowing component 6 is arranged on the periphery of the middle part of the mounting column 1, and the blowing component 6 is used to blow air outward from the inner wall of the underground pipeline.

[0023] The traveling assembly 2 includes a mounting ring 21, and mounting rings 21 are fixedly installed on the periphery of the left and right sides of the mounting column 1, and three fixing seats 22 are evenly fixedly installed on the periphery of the mounting ring 21, and the inner sides of the fixing seats 22 are limited and hinged with support columns 23, and the two sides of the support column 23 away from one end of the fixing seat 22 are symmetrically limited and rotatably connected with rollers 24, and the left side of the mounting ring 21 inside the mounting column 1 is limited and slidably connected with a slider 25, and a transmission rod 26 is transmission-connected between the slider 25 and the support column 23, and one end of the transmission rod 26 is hinged to the middle part of the support column 23 close to the mounting column 1, and the other end is tilted to the left and then hinged to the periphery of the inner slider 25, so that in the process of the slider 25 moving left and right, the transmission rod 26 can be used to drive the support column 23 to shrink or expand.

[0024] The left side of the slider 25 inside the mounting column 1 is limitedly slidably connected with a support block 27 , and a spring 28 is fixedly connected between the support block 27 and the slider 25 , so that the support block 27 elastically supports the slider 25 by means of the spring 28 .

[0025] The middle part of the mounting column 1 is rotationally connected with a threaded rod 7, which passes through the support blocks 27 and the slider 25 on the left and right sides, and the threaded rod 7 is threadedly connected with the support blocks 27 on the left and right sides. The threaded rod 7 passes through the middle parts of the sliders 25 on the left and right sides and does not contact the sliders 25. Therefore, during the rotation of the threaded rod 7, the support blocks 27 on the left and right sides can be driven to move left and right at the same time. The threaded rod 7 extends to the left to the left side of the mounting column 1, and a knob 71 is fixedly installed on the left end of the threaded rod 7 to facilitate driving the threaded rod 7 to rotate.

[0026] When it is necessary to inspect the pipeline, according to the size of the inner hole diameter of the pipeline, the threaded rod 7 is first driven to rotate by the left knob 71. During the rotation process, the threaded connection between the threaded rod 7 and the left and right support blocks 27 is utilized to drive the left and right support blocks 27 to move left and right at the same time. During the movement of the support blocks 27, the connection of the spring 28 can drive the slider 25 to move synchronously. When the slider 25 moves left and right, the connection of the transmission rod 26 can drive the support column 23 to shrink or expand around the fixed seat 22, thereby adjusting the size of the opening of the roller 24 to better meet the inner hole diameter of the pipeline, so that it can be suitable for pipelines with different inner hole sizes.

[0027] After the adjustment is completed, the right side of the installation column 1 is extended into the pipe toward the pipe port. During the extension process, when the roller 24 contacts the pipe port, it can drive the support column 23 to retract and rotate inward. During the rotation of the support column 23, the slider 25 can be pushed to compress the spring 28 through the action of the transmission rod 26. Under the action of the stress of the spring 28, the roller 24 can be better squeezed and attached to the inner wall of the pipe, which is beneficial to drive the installation column 1 to move inside when the roller 24 rotates, and is beneficial to stable movement in pipes with different inner hole sizes.

[0028] Furthermore, if Figure 6-Figure 8 As shown, a driving assembly 29 is provided on the inner side of the support column 23 in the right traveling assembly 2. The driving assembly 29 is used to drive the right roller 24 to rotate. The driving assembly 29 includes a gear 291 which is connected to the middle part of the hinge between the right support column 23 and the fixed seat 22 for limited rotation, and a belt 292 is connected between the two sides of the gear 291 and the roller 24 for transmission. Therefore, when the gear 291 rotates, the roller 24 can be driven to rotate through the belt 292.

[0029] A volute tooth is provided at the left end of the volute plate 4, and the volute tooth and the gear 291 are meshed with each other, so when the volute plate 4 rotates, all the gears 291 can be driven to rotate synchronously.

[0030] When it is necessary to drive the installation column 1 to move inside the pipeline, the motor 3 is started to drive the vortex plate 4 to rotate. During the rotation, the mutual engagement between the vortex teeth on the left side of the vortex plate 4 and the gear 291 can drive all the gears 291 to rotate synchronously. When the gear 291 rotates, the belt 292 connected between the two sides of the gear 291 and the roller 24 can drive the roller 24 on the right to rotate, thereby driving the installation column 1 to move right inside the pipeline.

[0031] like Figure 1 , Figure 9-11As shown, the cleaning component 5 includes a liquid storage tank 51, and the liquid storage tank 51 is fixedly installed on the right end of the spiral tooth plate 4. Cleaning liquid is stored in the liquid storage tank 51. A pressure pump 52 is fixedly installed on the right end of the liquid storage tank 51 for pressurizing the liquid storage tank 51. A sleeve 53 is evenly fixedly installed on the periphery of the liquid storage tank 51. The internal limiting sliding connection of the sleeve 53 is connected with a connecting rod 54. The connecting rod 54 can be telescopically moved in the sleeve 53 and fixed, so that the length of the cleaning brush 56 extending outward can be adjusted according to the inner hole diameter of the pipeline.

[0032] A connecting hose 55 is fixedly connected between the end of the connecting rod 54 close to the liquid storage bin 51 and the liquid storage bin 51, and is used to connect the liquid storage bin 51 with the connecting rod 54. A cleaning brush 56 is fixedly installed on the end of the connecting rod 54 away from the liquid storage bin 51. The cleaning brushes 56 are all designed to be inclined in the same direction to facilitate the cleaning of debris on the inner wall of the pipe. A water outlet hole 57 is opened between the brush heads of the cleaning brush 56. The water outlet hole 57 is connected to the hollow inside of the connecting rod 54, and then connected to the liquid storage bin 51 through the connecting hose 55, so that the cleaning liquid inside the liquid storage bin 51 can be sprayed out from the water outlet hole 57 and coated on the inner wall of the pipe through the rotating cleaning brush 56.

[0033] When it is necessary to clean the inner wall of the pipe, before placement, the connecting rod 54 is first connected by limited sliding in the sleeve 53 to adjust the length of the cleaning brush 56 extending outward according to the diameter of the inner hole of the pipe, so that the cleaning brush 56 is squeezed and contacted with the inner wall of the pipe. Therefore, when the motor 3 drives the volute 4 to rotate, it can also drive the liquid storage tank 51 to rotate, and then drive the outer cleaning brush 56 to rotate on the inner wall of the pipe. At the same time, through the action of the pressure pump 52, the liquid storage tank 51 can be pressurized, so that the cleaning liquid inside the liquid storage tank 51 can be sprayed outward from the water outlet 57 in the middle of the cleaning brush 56 through the connecting hose 55 and the connecting rod 54, and cooperate with the rotation of the cleaning brush 56 to clean the inner wall of the pipe, which is beneficial to the stable driving of the roller 24 for the mounting column 1, and the cleaning liquid can also be coated on the inner wall surface of the pipe.

[0034] Furthermore, if Figure 1 , Fig.12 As shown, the blowing assembly 6 includes a cavity 61, and the cavity 61 is fixedly installed on the periphery of the middle part of the mounting column 1. The periphery of the cavity 61 is evenly limited and elastically slidably connected with a jet pipe 62, so that the jet pipe 62 can be telescopically adjusted according to the diameter of the inner hole of the pipe. Blowers 63 are fixedly installed on the left and right sides of the cavity 61 for generating air pressure inside the cavity 61 and spraying it outward from the jet pipe 62.

[0035] The jet tubes 62 are flat in design and there are two groups of them. The two groups of jet tubes 62 are staggered on the left and right sides of the periphery of the cavity 61, so that when the jet tubes 62 move on the inner wall of the pipe, the displaced jet tubes 62 can fully cover the inner wall of the pipe to avoid areas where air is missed.

[0036] After the cleaning component 5 completes the cleaning of the inner wall on the right side of the pipeline and coats the inner wall of the pipeline with the cleaning liquid, during the movement of the mounting column 1 to the right, the blowing component 6 on the outer middle part of the mounting column 1 will pass through the cleaned area, and at the same time, the telescopic adjustment of the jet tube 62 can make the outer end of the jet tube 62 close to the inner wall of the pipeline, and then start the blower 63 to make the gas inside the cavity 61 spray outward through the jet tube 62. Therefore, during the movement to the right in the pipeline, when there is a leak in the pipeline, the jet tube 62 can spray the gas outward from the leaking part of the pipeline, and spray the cleaning liquid coated on the inner wall of the pipeline outward, so as to visually display the leakage of the pipeline. At the same time, the sprayed cleaning liquid can cause bubbles and water marks on the outer surface of the pipeline, so that the leakage can be marked in time for subsequent maintenance.

[0037] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A building underground pipeline engineering detection device, comprising a mounting column (1), characterized in that: Traveling components (2) are arranged on the periphery of the left and right sides of the installation column (1), and the traveling components (2) are used to drive the installation column (1) to move in the underground pipeline. A motor (3) is fixedly installed on the right side of the installation column (1), and the right end of the motor (3) is connected to a vortex disc (4) in a transmission manner. A cleaning component (5) is arranged on the right end of the vortex disc (4), and the cleaning component (5) is used to clean the inner wall of the front side of the underground pipeline when moving. A blowing component (6) is arranged on the periphery of the middle part of the installation column (1), and the blowing component (6) is used to blow air outward from the inner wall of the underground pipeline; The travel assembly (2) comprises a mounting ring (21), the mounting rings (21) are fixedly mounted on the periphery of the left and right sides of the mounting column (1), three fixing seats (22) are evenly fixedly mounted on the periphery of the mounting ring (21), the inner sides of the fixing seats (22) are all limitedly hinged with support columns (23), the two sides of the support columns (23) away from one end of the fixing seats (22) are symmetrically limitedly rotatably connected with rollers (24), the left side of the mounting ring (21) inside the mounting column (1) is limitedly slidably connected with a slider (25), the slider (25) and the support column (23) are both transmission-connected with a transmission rod (26), the left side of the slider (25) inside the mounting column (1) is limitedly slidably connected with a support block (27), and a spring (28) is fixedly connected between the support block (27) and the slider (25); A driving assembly (29) is provided on the inner side of the support column (23) in the right traveling assembly (2). The driving assembly (29) is used to drive the right roller (24) to rotate. The driving assembly (29) comprises a gear (291). The middle part of the hinge between the right supporting column (23) and the fixed seat (22) is connected to the gear (291) in a limited rotation manner. Belts (292) are connected between the two sides of the gear (291) and the roller (24).

2. The building underground pipeline engineering detection device according to claim 1 is characterized in that: One end of the transmission rod (26) is hinged to the middle of the support column (23) on the side close to the mounting column (1), and the other end is tilted to the left and hinged to the outer periphery of the inner sliding block (25).

3. The building underground pipeline engineering detection device according to claim 1 is characterized in that: The middle part of the mounting column (1) is connected to a threaded rod (7) for limited rotation. The threaded rod (7) passes through the support blocks (27) and the slider (25) on the left and right sides, and the threaded rod (7) is threadedly connected to the support blocks (27) on the left and right sides. The threaded rod (7) passes through the middle parts of the sliders (25) on the left and right sides without contacting the sliders (25). The threaded rod (7) extends leftward to the left side of the mounting column (1), and a knob (71) is fixedly mounted on the left end of the threaded rod (7).

4. The building underground pipeline engineering detection device according to claim 1 is characterized in that: A volute tooth is provided at the left end of the volute tooth plate (4), and the volute tooth and the gear (291) are meshed with each other.

5. The building underground pipeline engineering detection device according to claim 1 is characterized in that: The cleaning component (5) comprises: A liquid storage bin (51), wherein the right end of the volute disc (4) is fixedly provided with the liquid storage bin (51), and cleaning liquid is stored in the liquid storage bin (51); A pressure pump (52), wherein a pressure pump (52) is fixedly mounted on the right end of the liquid storage bin (51) and is used to pressurize the liquid storage bin (51); A sleeve (53), the outer periphery of the liquid storage bin (51) being evenly and fixedly mounted with the sleeve (53); A connecting rod (54), the sleeve (53) is internally limited and slidably connected with the connecting rod (54), and the connecting rod (54) can be telescopically moved and fixed in the sleeve (53); A connecting hose (55), wherein the connecting rod (54) is fixedly connected between one end of the connecting rod (54) close to the liquid storage bin (51) and the liquid storage bin (51), and is used to connect the liquid storage bin (51) to the connecting rod (54); A cleaning brush (56), wherein a cleaning brush (56) is fixedly mounted on one end of the connecting rod (54) away from the liquid storage bin (51), and the cleaning brushes (56) are all designed to be inclined in the same direction; A water outlet hole (57) is provided between the brush heads of the cleaning brush (56).

6. The building underground pipeline engineering detection device according to claim 5, characterized in that: The water outlet hole (57) is in communication with the hollow interior of the connecting rod (54), and is then in communication with the liquid storage bin (51) via a connecting hose (55), so that the cleaning liquid in the liquid storage bin (51) can be sprayed out from the water outlet hole (57).

7. The building underground pipeline engineering detection device according to claim 5 is characterized in that: The blowing component (6) comprises: A cavity (61), the cavity (61) being fixedly mounted on the periphery of the middle portion of the mounting column (1); An air injection pipe (62), the periphery of the cavity (61) being uniformly limited and elastically slidably connected with the air injection pipe (62); A blower (63) is fixedly installed on the left and right sides of the cavity (61) and is used to generate air pressure inside the cavity (61) and spray it outward from the spray pipe (62).

8. The building underground pipeline engineering detection device according to claim 7 is characterized in that: The air jet pipes (62) are of flat design and there are two groups of them in total. The two groups of air jet pipes (62) are staggeredly distributed on the left and right sides of the periphery of the cavity (61).

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