CN210922500U - Tunnel lining thickness detection device - Google Patents

Tunnel lining thickness detection device Download PDF

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Publication number
CN210922500U
CN210922500U CN201921803360.XU CN201921803360U CN210922500U CN 210922500 U CN210922500 U CN 210922500U CN 201921803360 U CN201921803360 U CN 201921803360U CN 210922500 U CN210922500 U CN 210922500U
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CN
China
Prior art keywords
support
flexible pipe
antenna
fixedly connected
connecting rod
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Expired - Fee Related
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CN201921803360.XU
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Chinese (zh)
Inventor
田珍明
赵昱丞
李峰
余宜洋
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Chongqing Yucai Engineering Consulting And Supervision Co Ltd
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Chongqing Yucai Engineering Consulting And Supervision Co Ltd
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Priority to CN201921803360.XU priority Critical patent/CN210922500U/en
Application granted granted Critical
Publication of CN210922500U publication Critical patent/CN210922500U/en
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Abstract

The utility model discloses a tunnel lining thickness detection device relates to thickness detection device, aims at solving the comparatively inconvenient problem of current lining cutting thickness geological radar detection device operation its technical scheme main points are: including the support, gather host computer, antenna and be used for connecting the connecting cable who gathers host computer and antenna, gather host computer fixed connection in support, the lower extreme fixedly connected with butt of support is in the universal wheel on ground, the upper end fixedly connected with buffer gear of support, buffer gear is including a plurality of flexible pipe one that are the level setting, insert flexible pipe two and the overcoat that locates flexible pipe one and flexible pipe two buffer spring, the tip fixed connection in support that flexible pipe two was kept away from to flexible pipe one, flexible pipe two is kept away from the tip connection in antenna of flexible pipe one, buffer spring's both ends difference fixed connection in flexible pipe one and flexible pipe two. The utility model discloses the operation is comparatively convenient when using.

Description

Tunnel lining thickness detection device
Technical Field
The utility model relates to a thickness detection device, more specifically say, it relates to a tunnel lining thickness detection device.
Background
The tunnel concrete lining is the most important and last line of defense in tunnel waterproof engineering. The quality of the tunnel concrete lining is important to the stability and safety of the tunnel use. The quality detection of the tunnel concrete lining is an important link of quality control and quality acceptance. At present, one of main contents of detecting the tunnel concrete lining quality is the detection of the tunnel concrete lining thickness, and a ground penetrating radar detection method is mainly adopted when the tunnel concrete lining thickness is carried out, and the tunnel lining thickness is detected through the ground penetrating radar.
The ground penetrating radar is equipment which utilizes ultra-high frequency narrow pulse electromagnetic waves (106-109 HZ) emitted to the underground, collects information returned by the waves according to the characteristics of reflection, refraction, transmission, decay and the like followed by the waves propagating in the underground, and displays an underground medium spectrum characteristic image through mathematical calculation and fitting. Compared with the conventional seismic waves, the ultrahigh frequency electromagnetic waves adopted by the ground penetrating radar have very high resolution.
The main components of the existing ground penetrating radar detection device comprise an acquisition host, a transmitting antenna, a receiving antenna, a connecting cable, a communication optical cable, analysis software and a computer system; the antenna and the acquisition host are mostly in rectangular structures. Meanwhile, when the tunnel lining thickness is detected, the transmission and receiving antennas and the connecting cable are relatively heavy and inconvenient to carry due to the collection host; many people need to carry respectively transmission, receiving antenna laminating tunnel wall and other people carry the collection host computer and connecting cable to follow simultaneously and measure, and the operation is comparatively inconvenient.
SUMMERY OF THE UTILITY MODEL
Not enough to prior art exists, the utility model aims to provide a tunnel lining thickness detection device, its operation is comparatively convenient.
The above technical purpose of the present invention can be achieved by the following technical solutions: the utility model provides a tunnel lining thickness detection device, includes the support, gathers host computer, antenna and is used for connecting the connecting cable who gathers host computer and antenna, gather host computer fixed connection in the support, a plurality of butt of the lower extreme fixedly connected with of support are in the lower extreme of universal wheel and a plurality of universal wheel equipartition in the support on ground, the upper end fixedly connected with buffer gear of support, buffer gear is including being a plurality of flexible pipe one that the level set up, insert the buffer spring who locates flexible pipe two and flexible pipe two of locating with the overcoat of flexible pipe one, the tip fixed connection in the support that flexible pipe two was kept away from to flexible pipe one, flexible pipe two is kept away from the tip connection in antenna of flexible pipe one, buffer spring's both ends difference fixed connection in flexible pipe one and flexible pipe two.
By adopting the technical scheme, the acquisition host is fixedly connected to the support, the lower end of the support is fixedly connected with a plurality of universal wheels, and the antenna for detecting the lining thickness is fixedly connected to the buffer mechanism, so that in the using process, the support can play a supporting role for the antenna, the acquisition host and the connecting cable, when the tunnel lining thickness is required to be detected, the support is only required to be pushed, the antenna is abutted against the lining surface of the tunnel, the support can slide along the ground through the universal wheels, meanwhile, the flatness of the lining surface is relatively poor because the tunnel lining surface is formed by pouring concrete, when the detection end surface of the antenna slides by the lining surface, the first telescopic pipe and the second telescopic pipe can slide axially relative to each other under the action of the buffer spring, and the buffer spring can stretch to adapt to the lining surface, make the antenna can be comparatively inseparable laminating in the lining face relatively, the measuring accuracy is better relatively, only needs alone can operate when testing lining thickness simultaneously, and it is more convenient relatively to operate.
The utility model discloses further set up to: the universal wheel is a self-locking universal wheel.
Through adopting above-mentioned technical scheme for do not need the support to remove or need will the utility model discloses when placing temporarily, only need through the probability that the auto-lock universal wheel auto-lock removed in order to reduce the relative ground of support at will.
The utility model discloses further set up to: the antenna is cuboid, two vertical edges of the antenna far away from the support are fixedly connected with guide plates in arc surface structures respectively, the arc surfaces of the two guide plates are opened oppositely, and the central axis of the arc surfaces of the two guide plates is arranged vertically.
Through adopting above-mentioned technical scheme for when meeting the barrier that lug etc. can hinder the antenna to slide for the antenna, the guide plate that is cambered surface structure can play the guide effect to the antenna, makes the antenna can cross partial barrier, reduces the probability that the antenna is hindered in the test procedure, makes the result of use better relatively.
The utility model discloses further set up to: the utility model discloses a flexible pipe, including flexible pipe two, mounting panel, the horizontal part of support is kept away from to the horizontal part of the L type of flexible pipe two and mounting panel, the vertical portion fixed connection of the L type of mounting panel is kept away from the mode level of support and is extended towards, the mounting panel slides and is connected with the grip block that can vertically slide, the grip block is U form and its U form opening down, the antenna joint is in the U form opening of grip block and the antenna is located the horizontal part top of the L shape of mounting panel.
Through adopting above-mentioned technical scheme, when carrying out lining cutting thickness and examining, make the antenna joint in the U form opening of grip block and the antenna be located the L shape's of mounting panel horizontal part top, can detect, when needs are maintained or are overhauld the antenna simultaneously, only need make the grip block slide up, in order to break away from the U form opening of grip block with the antenna, can take off the antenna.
The utility model discloses further set up to: the upper end of the support is fixedly connected with a plurality of sliding plates parallel to the first telescopic pipe, the cross section of each sliding plate is a U-shaped horizontal opening, a damping slide rail is fixedly connected in the U-shaped opening of each sliding plate, one end, far away from the antenna, of the first telescopic pipe is fixedly connected to the sliding plate of the damping slide rail, the upper portion of the support is rotatably connected with a worm parallel to the first telescopic pipe, and one end, far away from the antenna, of the first telescopic pipe is fixedly connected with a worm rod meshed with the worm.
Through adopting above-mentioned technical scheme, make flexible pipe a fixed connection in damping slide rail for buffer gear can be through the relative support shrinkage of slide rail and arrange buffer gear in the upper portion of support, at the distance that needs adjust antenna and support, make antenna extension length increase, only need rotate the worm and make buffer gear pass through damping slide rail roll-off, with the distance of stretching out that increases the relative support of antenna, make the antenna can detect the position farther relatively apart from the support, make the utility model discloses an excellent relatively of result of use.
The utility model discloses further set up to: the damping slide rail is a fully-extended slide rail.
Through adopting above-mentioned technical scheme, the relative ordinary slide rail of full extension formula slide rail, the full extension formula slide rail can make the slide rail roll-off completely, can further increase the protrusion distance of the relative support of antenna, further optimizes the result of use.
The utility model discloses further set up to: the support includes the bracing piece of two sets of vertical settings, connects the connecting rod one and a plurality of connecting rod two of two sets of bracing pieces, every group the bracing piece includes a plurality of bracing pieces that are parallel to each other and universal wheel fixed connection in bracing piece lower extreme, the both ends of connecting rod two respectively fixed connection in two adjacent bracing pieces of same group, connecting rod one is located the upper end of bracing piece and connecting rod one is the level setting, slide fixed connection is in connecting rod one, the both ends of connecting rod one articulate respectively in the upper portion of the bracing piece of different groups, the bracing piece articulates there is the tip that adjusts the pole and adjust the pole and keep away from the bracing piece and slides and connect.
Through adopting the technical scheme, when lining cutting thickness detects in needs, only need to make the regulation pole slide and connect in the tip of connecting rod one towards the bracing piece at regulation pole place and slide to make bracing piece and connecting rod mutually perpendicular, can detect, when not needing to carry out lining cutting thickness to detect simultaneously, only need to make the lock bar slide and connect in the tip of connecting rod one and slide towards the direction of another set of bracing piece, so that bracing piece and connecting rod one can fold, so as to carry, and reduce the utility model discloses an occupation space.
The utility model discloses it is further set up to, a plurality of the board is placed to the top fixedly connected with of slide, gather host computer fixed connection in placing the board.
Through adopting above-mentioned technical scheme, gather host computer fixed connection in placing the board, can make when folding the support, reduce the probability that the host computer of gathering interferes adjusting sliding of pole.
To sum up, the utility model discloses following beneficial effect has:
1. when lining thickness detection is carried out, an antenna is fixedly connected to a second telescopic pipe, the first telescopic pipe can axially slide relative to the second telescopic pipe, when the antenna slides to a position with relatively poor flatness, the antenna can be relatively more closely attached to a lining surface under the action of a buffer spring, the first telescopic pipe is fixedly connected to a damping slide rail, the damping slide rail is a fully-extended slide rail, when the antenna is required to test the lining thickness of a position farther from a support or a position unchanged, a worm rod fixedly connected to the first telescopic pipe only needs to be rotated to enable a worm rod to slide along the axial direction of the worm rod, so that the distance from the antenna to the support is changed, and the antenna can extend farther relative to the support;
2. when need not examining, make the locking pole slide and connect in the tip of connecting rod one and slide towards the direction of another set of bracing piece, so that the contained angle between bracing piece and the connecting rod one reduces, so that bracing piece and connecting rod one can fold, so that carry, and reduce the utility model discloses an occupation space, carry out lining cutting thickness simultaneously and examine time measuring, only need make to adjust the pole slide and connect in the tip of connecting rod one and slide towards the bracing piece at regulation pole place, so that bracing piece and connecting rod mutually perpendicular, make the support expand and to detect, the result of use is better relatively.
Drawings
Fig. 1 is a schematic structural view of the present invention;
fig. 2 is a schematic diagram of a partial explosion of the present invention, which is mainly used for showing the structure of the worm and the damping slide rail;
FIG. 3 is an enlarged view of the portion A of FIG. 2, which is mainly used to show the structure of the buffer mechanism;
fig. 4 is a schematic view of a part of the structure of the present invention, which is mainly used for showing the structures of the first connecting rod and the locking hole.
In the figure: 1. a support; 11. a universal wheel; 12. a slide plate; 121. placing the plate; 13. damping the slide rail; 14. a worm; 141. a handle; 15. a support bar; 16. a first connecting rod; 161. a locking hole; 17. a second connecting rod; 18. adjusting a rod; 181. a sleeve; 182. a lock lever; 183. a handle is rotated; 2. collecting a host; 21. an antenna; 211. a guide plate; 22. connecting a cable; 3. a buffer mechanism; 31. a first telescopic pipe; 311. a snail mother strip; 312. a third connecting rod; 32. a second telescopic pipe; 321. mounting a plate; 322. a clamping plate; 323. a first sliding chute; 324. a first sliding block; 325. a tension spring; 33. a buffer spring.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and examples.
Tunnel lining thickness detection device, refer to fig. 1 and fig. 2, including support 1, the upper portion fixedly connected with of support 1 gathers host computer 2, gathers host computer 2 fixedly connected with and is used for transmission signal's connecting cable 22, and connecting cable 22 keeps away from the one end fixedly connected with who gathers host computer 2 and is used for receiving and the antenna 21 of transmission. The lower end of the bracket 1 is fixedly connected with a universal wheel 11 used for moving, wherein the universal wheel 11 is a self-locking universal wheel, and the antenna 21 is cuboid.
Referring to fig. 2 and 3, a buffer mechanism 3 for extending the antenna 21 out of the bracket 1 and allowing the antenna 21 to be contracted adaptively is fixedly connected to an upper portion of the bracket 1. The buffer mechanism 3 comprises a first telescopic pipe 31 arranged horizontally, a second telescopic pipe 32 inserted in the first telescopic pipe 31, and a buffer spring 33 sleeved with the first telescopic pipe 31 and the second telescopic pipe 32, and the antenna 21 is connected to the end part of the second telescopic pipe 32 far away from the first telescopic pipe 31. The detection end face of the antenna 21 faces a direction departing from the support 1, the first telescopic pipe 31 and the second telescopic pipe 32 are the same as the central axis, and two ends of the buffer spring 33 are fixedly connected to the first telescopic pipe 31 and the second telescopic pipe 32 respectively.
Two vertical edges of the antenna 21 far away from the bracket 1 are respectively and fixedly connected with guide plates 211 in an arc surface structure, the arc surfaces of the two guide plates 211 are oppositely opened, and the central axes of the arc surfaces are vertically arranged.
In order to enable the antenna 21 to be connected with the second extension tube 32 relatively more stably, the end part of the second extension tube 32 far away from the first extension tube 31 is fixedly connected with a mounting plate 321 for placing the antenna 21. The plate surface of the mounting plate 321 is perpendicular to the second telescopic tube 32, and the lower side edge of the mounting plate 321 extends horizontally towards the direction far away from the second telescopic tube 32, so that the mounting plate 321 is in an L-shaped structure. The antenna 21 is placed above the horizontal plane of the mounting board 321.
Referring to fig. 2 and 3, the vertical portion of the mounting plate 321 is provided with a first sliding groove 323 extending vertically, the first sliding groove 323 is horizontally opened and the opening of the first sliding groove 323 faces a direction away from the bracket 1, wherein the first sliding groove 323 is a T-shaped groove. The first sliding groove 323 is connected with a first sliding block 324 matched with the first sliding groove in a sliding mode, one end, far away from the support 1, of the first sliding block 324 penetrates through the first sliding groove 323, and the end, far away from the support 1, of the first sliding block 324 is fixedly connected with a clamping plate 322 used for clamping the antenna 21. An extension spring 325 is vertically arranged above the first sliding block 324, and two ends of the extension spring 325 are respectively and fixedly connected to the first sliding block 324 and the side wall of the first sliding groove 323.
The holding plate 322 is U-shaped with its U-shaped opening facing downward, and the antenna 21 is held between the holding plate 322 and the horizontal portion of the mounting plate 321, wherein part or all of the antenna 21 is clipped in the U-shaped opening of the holding plate 322.
Two mutually parallel sliding plates 12 are fixedly connected to the upper end of the bracket 1, and the sliding plates 12 are parallel to the first telescopic pipe 31. The slides 12 are U-shaped in cross-section and the U-shapes of the two slides 12 open towards each other. A damping slide rail 13 is arranged in the U-shaped opening of the slide plate 12. The fixed rail of the damping slide rail 13 is fixedly connected to the sliding plate 12, the movable rail of the damping slide rail 13 is fixedly connected to the first telescopic tube 31, and the sliding direction of the damping slide rail 13 is parallel to the first telescopic tube 31. Wherein the damping slide rail 13 is a fully extended slide rail.
When damping slide rail 13 contracts completely, buffer gear 3 can be accomodate in the upper portion of support 1, and the up end fixedly connected with of two slides 12 is the board 121 that places of level setting, and collection host computer 2 fixed connection is in the upper portion face of placing board 121.
The end parts of the two extension tubes one 31 fixedly connected to the damping slide rail 13 are fixedly connected with a connecting rod three 312, and two ends of the connecting rod three 312 are respectively and fixedly connected to the end parts of the extension tubes one 31 far away from the antenna 21. The upper part of the bracket 1 is rotatably connected with a worm 14 parallel to the first telescopic pipe 31, and the middle part of the third connecting rod 312 is fixedly connected with a worm bar 311 meshed with the worm 14.
The support 1 comprises two groups of vertically arranged support rods 15, two first connecting rods 16 for connecting the two groups of support rods 15 and a plurality of second connecting rods 17. Each group of supporting rods 15 comprises two supporting rods 15 which are parallel to each other, two ends of the second connecting rod 17 are fixedly connected to the two supporting rods 15 in the same group respectively, and the second connecting rod 17 is arranged horizontally. Two ends of the first connecting rods 16 are hinged to the upper ends of the supporting rods 15 of different groups respectively, the two first connecting rods 16 are parallel to each other and are arranged horizontally, and the rotating planes of the first connecting rods 16 and the supporting rods 15 are overlapped with the plane where the central axes of the first connecting rods 16 and the supporting rods 15 are located. The sliding plate 12 is fixedly connected to the first connecting rod 16, the worm 14 is rotatably connected to the first connecting rod 16, and the end of the worm 14 far away from the collection host 2 is fixedly connected with a handle 141 for assisting rotation.
Referring to fig. 2 and 4, the upper portion of the support rod 15 is hinged with an adjusting rod 18, and the rotation plane of the adjusting rod 18 is coincident with the plane of the central axes of the first connecting rod 16 and the support rod 15. The end of the adjusting rod 18 away from the supporting rod 15 is fixedly connected with a sleeve 181, the sleeve 181 is sleeved on the first connecting rod 16, and the sleeve 181 can slide along the axial direction of the first connecting rod 16. The first connecting rod 16 is provided with two locking holes 161 which are distributed along the axial direction of the first connecting rod, and the locking holes 161 are counter bores with openings facing upwards. The sleeve 181 is connected with a locking rod 182 which is vertically arranged in a threaded manner, one end of the locking rod 182 can be inserted into or separated from the locking hole 161, and the other end of the locking rod 182 penetrates out of the locking hole 161 and the sleeve 181 and is fixedly connected with a rotating handle 183.
Wherein the support rod 15 and the first connecting rod 16 are perpendicular to each other when the locking rod 182 is inserted into the locking hole 161. The sum of the lengths of the two locking rods 182 and the two times of the distance from the hinged part of the locking rod 182 and the supporting rod 15 to the hinged end of the supporting rod 15 and the connecting rod one 16 is less than the length of the connecting rod one 16.
It is above only the utility model discloses a preferred embodiment, the utility model discloses a scope of protection does not only confine above-mentioned embodiment, the all belongs to the utility model discloses a technical scheme under the thinking all belongs to the utility model discloses a scope of protection. It should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims (8)

1. The utility model provides a tunnel lining thickness detection device which characterized in that: including support (1), collection host computer (2), antenna (21) and be used for connecting the connecting cable (22) of gathering host computer (2) and antenna (21), gather host computer (2) fixed connection in support (1), the lower extreme fixedly connected with butt of support (1) in universal wheel (11) on ground, the upper end fixedly connected with buffer gear (3) of support (1), buffer gear (3) are including being a plurality of flexible pipe one (31) that the level set up, insert and locate flexible pipe two (32) of flexible pipe one (31) and buffer spring (33) that flexible pipe one (31) and flexible pipe two (32) are located to the overcoat, the tip fixed connection in support (1) of flexible pipe two (32) is kept away from in flexible pipe one (31), the tip connection in antenna (21) that flexible pipe one (31) was kept away from in flexible pipe two (32) is kept away from in flexible pipe two (32) in flexible pipe one (31) respectively, the both ends of buffer spring (33) are fixed connection in flexible .
2. The tunnel lining thickness detection apparatus according to claim 1, wherein: the universal wheel (11) is a self-locking universal wheel.
3. The tunnel lining thickness detection apparatus according to claim 1, wherein: the antenna (21) is cuboid, two vertical edges of the antenna far away from the support (1) are fixedly connected with guide plates (211) in an arc surface structure respectively, the arc surfaces of the two guide plates (211) are opened oppositely, and the central axis of the arc surface is vertically arranged.
4. The tunnel lining thickness detection apparatus according to claim 1, wherein: the utility model discloses a support of telescopic pipe (31) is characterized in that the tip fixedly connected with cross-section that telescopic pipe (31) was kept away from to flexible pipe two (32) is mounting panel (321) that the L shape was the L shape, the vertical portion fixed connection of the L type of mounting panel (321) is in the horizontal part orientation of the L type of flexible pipe two (32) and mounting panel (321) and is kept away from the mode level extension of support (1), mounting panel (321) slide and are connected with grip block (322) that can vertically slide, grip block (322) are U shape and its U shape opening down, antenna (21) joint is in the U shape opening of grip block (322) and antenna (21) are located the horizontal part top of the L shape of mounting panel (321).
5. The tunnel lining thickness detection apparatus according to claim 4, wherein: the antenna is characterized in that a plurality of sliding plates (12) parallel to a first telescopic pipe (31) are fixedly connected to the upper end of the support (1), the cross section of each sliding plate (12) is U-shaped and U-shaped, a damping sliding rail (13) is fixedly connected to the inside of the U-shaped opening of each sliding plate (12), one end, far away from the antenna (21), of the first telescopic pipe (31) is fixedly connected to the sliding plate of the damping sliding rail (13), a worm (14) parallel to the first telescopic pipe (31) is rotatably connected to the upper portion of the support (1), and one end, far away from the antenna (21), of the first telescopic pipe (31) is fixedly connected to a worm mother bar (311) meshed with the worm (14.
6. The tunnel lining thickness detection apparatus of claim 5, wherein: the damping slide rail (13) is a fully-extended slide rail.
7. The tunnel lining thickness detection apparatus of claim 5, wherein: the support (1) comprises two groups of vertically arranged support rods (15), a first connecting rod (16) and a plurality of second connecting rods (17), wherein the first connecting rod (16) is used for connecting the two groups of support rods (15), each group of support rods (15) comprises a plurality of support rods (15) which are parallel to each other, universal wheels (11) are fixedly connected to the lower ends of the support rods (15), two ends of the second connecting rod (17) are respectively and fixedly connected with two adjacent supporting rods (15) in the same group, the first connecting rod (16) is positioned at the upper end of the supporting rod (15), the first connecting rod (16) is horizontally arranged, the sliding plate (12) is fixedly connected with a first connecting rod (16), two ends of the first connecting rod (16) are respectively hinged to the upper parts of the supporting rods (15) in different groups, the support rod (15) is hinged with an adjusting rod (18), and the end part, far away from the support rod (15), of the adjusting rod (18) is connected to the first connecting rod (16) in a sliding mode.
8. The tunnel lining thickness detection apparatus of claim 7, wherein: a placing plate (121) is fixedly connected above the sliding plates (12), and the collecting host (2) is fixedly connected to the placing plate (121).
CN201921803360.XU 2019-10-24 2019-10-24 Tunnel lining thickness detection device Expired - Fee Related CN210922500U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201921803360.XU CN210922500U (en) 2019-10-24 2019-10-24 Tunnel lining thickness detection device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201921803360.XU CN210922500U (en) 2019-10-24 2019-10-24 Tunnel lining thickness detection device

Publications (1)

Publication Number Publication Date
CN210922500U true CN210922500U (en) 2020-07-03

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CN201921803360.XU Expired - Fee Related CN210922500U (en) 2019-10-24 2019-10-24 Tunnel lining thickness detection device

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CN (1) CN210922500U (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113532310A (en) * 2021-07-08 2021-10-22 四川督信工程试验检测有限责任公司 Pavement structure depth measuring instrument and structure depth detection method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113532310A (en) * 2021-07-08 2021-10-22 四川督信工程试验检测有限责任公司 Pavement structure depth measuring instrument and structure depth detection method

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Granted publication date: 20200703