Foundation radar fixing device for tunnel surrounding rock micro-deformation monitoring

Abstract

The invention relates to the technical field of ground-based radar fixing, and discloses a ground-based radar fixing device for tunnel surrounding rock micro-deformation monitoring, the ground-based radar fixing device comprises a mounting table and a radar body, the mounting table is provided with a groove, the groove is provided with a placement table, and the width of the radar body is greater than that of the placement table; sliding grooves are formed in the positions, located on the two sides of the containing table, of the bottom of the groove. A protection box with the side wall open is slidably connected into the sliding grooves. Side grooves are formed in the two sides of the side wall of the protection box, and clamping arms are slidably connected into the side grooves. The adjusting mechanism is used for adjusting the distance between the two protection boxes, and the linkage mechanism moves along with the protection boxes to adjust the distance between the two clamping arms in the protection boxes. The scheme mainly solves the problem that an existing radar host is inconvenient to install.

Description

Technical Field

[0001] The invention relates to the technical field of ground-based radar fixing, and in particular to a ground-based radar fixing device used for monitoring micro-deformation of tunnel surrounding rocks. Background Art

[0002] Tunnel construction has the characteristics of harsh construction environment, complex and changeable geological conditions, many potential sources of danger, large construction volume and strong comprehensiveness, so safety accidents are very likely to occur. The ground-based radar technology for monitoring micro-deformation of tunnel surrounding rocks has the advantages of working around the clock, non-contact, large observation area, and no light restrictions. It has been successfully applied in slope monitoring of open-pit mine dumps, mining sites, tailings ponds, etc., dam body and slope deformation monitoring of water conservancy and hydropower, and monitoring of landslides, subsidence, mudslides and other geological disasters. At present, the environment inside the tunnel is relatively complex, the light signal is relatively weak, and the installation location of the radar may have poor transmission and reception effects on electromagnetic waves, resulting in poor monitoring effects.

[0003] To solve the above problems, a Chinese patent with publication number CN216770463U discloses a fixing device for a tunnel foundation micro-deformation radar that is easy to adjust, including a radar body, a fixed steel frame and a base, wherein a fixed steel frame mechanism and a rotating mechanism are arranged on the base of the device, and the radar body is arranged on the adjusting mechanism through a mounting structure; by arranging the fixed steel frame, the rotating seat and the adjusting seat, etc., it is convenient to adjust the monitoring range, angle and direction of the radar, so that the radar has better emission and reception effects of electromagnetic waves and improves the monitoring accuracy.

[0004] The following problems exist during the actual use of the above-mentioned fixing device: the radar host is set on the radar platform. The conventional setting method is usually to manually install the radar host on the radar platform with bolts. However, due to the complex environment in the tunnel, if the installation position of the radar host is relatively narrow, then manual installation will inevitably lead to installation inconveniences. In addition, in order to ensure the stability of the radar host installation, there will be multiple connection positions between the radar host and the radar platform, which will inevitably increase the difficulty of installation. Summary of the invention

[0005] The present invention aims to provide a ground-based radar fixing device for monitoring micro-deformation of tunnel surrounding rocks, so as to solve the problem of inconvenient installation of existing radar host.

[0006] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a ground-based radar fixing device for monitoring micro-deformation of tunnel surrounding rock, comprising a mounting platform and a radar body, the mounting platform is provided with a groove, the groove is provided with a placing platform, the width of the radar body is greater than the width of the placing platform; the bottom of the groove is located on both sides of the placing platform and is provided with slide grooves, and a protection box with side wall openings is slidably connected in the slide grooves; side grooves are provided on both sides of the side walls of the protection box, and a clamping arm is slidably connected in the side grooves; it also includes an adjustment mechanism for adjusting the distance between the two protection boxes, and a linkage mechanism for adjusting the distance between the two clamping arms in the protection box as the protection box moves.

[0007] The principles and advantages of this solution are:

[0008] 1. This solution places the radar body on the mounting table. The width of the radar body is greater than the width of the mounting table, so that the staff can take and place the radar body.

[0009] 2. This solution uses an adjustment mechanism to drive the two protection boxes closer together, so that the two sides of the radar body enter the two protection boxes respectively, thereby protecting the radar body.

[0010] 3. In this scheme, when the two protection boxes are close to each other, the protection boxes move laterally, and the two clamping arms are driven to approach each other through the linkage mechanism, so that the two clamping arms are respectively against the upper and lower sides of the radar body, that is, the radar body is clamped and positioned by the two clamping arms. Compared with the existing technology, this scheme does not require the staff to position the radar host in a relatively narrow space, nor does it require changing positions to position the radar host at different positions. Therefore, this scheme is simpler to position the radar host.

[0011] Furthermore, an elastic block is provided between the two clamping arms in the protection box. The elastic block is arc-shaped, and the protruding directions of the elastic blocks in the two protection boxes are arranged relatively in the horizontal direction.

[0012] Through the above arrangement, when the two clamping arms are close to each other, the distance between the two ends of the elastic block is reduced, and the convex amplitude of the elastic block is larger. When the two clamping arms clamp the radar body, the convex position of the elastic block abuts against the radar body, so that the elastic blocks on the left and right sides abut against the left and right sides of the radar body, that is, the radar body is clamped and positioned using the two elastic blocks. Therefore, this solution can position the radar body in the horizontal and vertical directions, and the positioning effect is better.

[0013] Furthermore, the linkage mechanism includes a fixed block fixed to the mounting platform, a wedge block fixed to the clamping arm, and a first spring fixed between the clamping arm and the side groove. Through holes are provided on both sides of the side wall of the fixed block, and the side walls of the through holes are provided with wedge surfaces for squeezing the wedge block; the wedge block can move vertically in the side groove, and the wedge block passes through the through hole, and the wedge block can move horizontally and vertically in the through hole.

[0014] Through the above arrangement, when the two protection boxes are close to each other, the protection boxes move laterally, and the protection boxes drive the wedge blocks to move laterally through the clamping arms, so that the wedge blocks move laterally in the through holes; the protection boxes continue to move laterally, so that the wedge blocks are squeezed by the wedge surfaces to move vertically, so that the two wedge blocks are close to each other, and then the two clamping arms are respectively against the upper and lower sides of the radar body, that is, the radar body is clamped and positioned using the two clamping arms.

[0015] Furthermore, the adjustment mechanism includes a chamber opened inside the mounting platform, a bidirectional screw rotatably connected to the chamber, and a driving member for driving the bidirectional screw to rotate. The chamber is communicated with the slide groove, and the two protection boxes are respectively threadedly connected to the two ends of the bidirectional screw.

[0016] Through the above arrangement, the bidirectional screw is driven to rotate by the driving member, so that the two protection boxes are brought closer; therefore, there is no need for workers to operate in a narrow space or change multiple positions, and this solution is easier to operate.

[0017] Furthermore, an extension block is provided on the wedge block, and an elastic layer is provided on the extension block; vertical plates are provided on both sides of the mounting platform located on the placing platform, the spacing between the two vertical plates is greater than the spacing between the two fixed blocks, vertical holes are provided on both sides of the side walls of the vertical plates, the extension block and the elastic layer both pass through the vertical holes, the extension block can move vertically and laterally in the vertical holes, the vertical holes are located on the movement trajectory of the elastic layer, and the width of the vertical holes is less than the width of the elastic layer.

[0018] Through the above arrangement, during the lateral and vertical movement of the wedge block, the wedge block drives the extension block to move synchronously, and the extension block drives the elastic layer to move synchronously, so that the elastic layer extends into the vertical hole, and the elastic layer is deformed and stuck in the vertical hole, thereby hindering the movement of the extension block, and then the extension block limits the clamping arm through the wedge block, further strengthening the clamping effect of the two clamping arms on the radar body.

[0019] Furthermore, the width of the vertical hole gradually decreases from one end of the vertical hole close to the end of the vertical plate to one end of the vertical hole close to the adjacent vertical hole, and the extension block can frictionally contact with the smallest width of the vertical hole.

[0020] Through the above arrangement, during the lateral movement of the wedge block, the wedge block drives the extension block to move laterally, so that the extension block moves lateraly in the vertical hole; during the vertical movement of the wedge block, the wedge block drives the extension block to move vertically, so that the extension block moves vertically to the position where the width of the vertical hole is minimum, so that the extension block is in frictional contact with the position where the width of the vertical hole is minimum, and the friction force is used to hinder the movement of the extension block, and then the extension block limits the clamping arm through the wedge block, further strengthening the clamping effect of the two clamping arms on the radar body.

[0021] Furthermore, an inner chamber is provided inside the fixed block, and wall grooves are provided on both sides of the inner chamber, which are communicated with the through hole; a rotating shaft is rotatably connected in the inner chamber, and an elliptical block is coaxially connected to the rotating shaft, and the two long axis ends of the elliptical block can respectively pass through the two wall grooves and abut against the two wedge blocks; and it also includes a power mechanism that drives the rotating shaft to rotate as the spacing between the two wedge blocks on the fixed block changes.

[0022] Through the above arrangement, when the two wedge blocks are close to each other, the power mechanism drives the rotating shaft to rotate, so that the two long axis ends of the elliptical block are respectively against the upper and lower wedge blocks, which can limit the wedge blocks and then limit the clamping arms, further strengthening the clamping effect of the two clamping arms on the radar body.

[0023] Furthermore, the power mechanism includes a gear coaxially connected to the rotating shaft, a guide plate fixed in the inner chamber and located on both sides of the gear, a rack is vertically connected to the guide plate, a second spring is provided between the rack and the guide plate, the rack can move vertically in the wall groove and the through hole, and the rack is located on the movement trajectory of the wedge block; the two racks are respectively located on both sides of the gear, and the rack is meshed with the gear.

[0024] Through the above arrangement, when the two clamping arms are close to each other, the clamping arms squeeze the rack to move vertically, the rack meshes with the gear to drive the rotating shaft to rotate, and the rotating shaft drives the elliptical block to rotate.

[0025] Furthermore, a push block is laterally slidably connected to the fixed block, the push block extends into the inner chamber, and a third spring is provided between the push block and the inner chamber; a guide hole is provided on the side wall of the protection box, the guide hole is located between the two side grooves, the push block passes through the through hole and abuts against the raised position of the elastic block, and the push block can move laterally in the guide hole; a cam is coaxially connected to the rotating shaft, and the cam abuts against the push block.

[0026] Through the above arrangement, during the rotation of the shaft, the shaft drives the cam to rotate synchronously, and the raised portion of the cam is used to squeeze the push block to move laterally, so that the end of the push block away from the cam is against the raised position of the elastic block, thereby limiting the elastic block and further enhancing the clamping effect of the two elastic blocks on the radar body. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 The present invention is a front view of an embodiment of a ground-based radar fixing device for monitoring micro-deformation of tunnel surrounding rocks.

[0028] Figure 2 for Figure 1 Sectional view from the front direction.

[0029] Figure 3 for Figure 2 Enlarged view of point A in the middle. DETAILED DESCRIPTION

[0030] The following is further described in detail through specific implementation methods:

[0031] The figure marks in the drawings of the specification include: mounting table 10, radar body 11, groove 20, placement table 21, slide groove 22, protection box 23, side groove 24, clamping arm 25, elastic block 26, chamber 30, bidirectional screw 31, motor 32, fixing block 40, wedge block 41, first spring 42, through hole 43, wedge surface 44, extension block 50, elastic layer 51, vertical plate 52, vertical hole 53, inner chamber 60, wall groove 61, rotating shaft 62, elliptical block 63, gear 70, guide plate 71, rack 72, second spring 73, push block 80, third spring 81, cam 82.

[0032] Example

[0033] Basically as attached Figure 1 , Attachment Figure 2 , Attachment Figure 3 As shown: a ground-based radar fixing device for monitoring micro-deformation of tunnel surrounding rock, comprising a mounting platform 10 and a radar body 11; a groove 20 is provided on the mounting platform 10, a placement platform 21 is fixedly connected to the middle position of the groove 20, the radar body 11 is placed on the placement platform 21, and the width of the radar body 11 is greater than the width of the placement platform 21; the bottom of the groove 20 is located on both sides of the placement platform 21 and has slide grooves 22 transversely provided, a protection box 23 with side wall openings is slidably connected in the slide grooves 22, and the opening ends of the two protection boxes 23 in the groove 20 are transversely arranged opposite to each other; after the radar body 11 is placed on the placement platform 21, the radar body 11 can enter the protection box 23; side grooves 24 are provided on both sides of the side walls of the protection box 23, and a clamping arm 25 is slidably connected in the side grooves 24. An elastic block 26 is fixedly connected between the two clamping arms 25 in the protection box 23. The elastic block 26 is an elastic iron sheet and is arc-shaped. The protruding directions of the elastic blocks 26 in the two protection boxes 23 are arranged relatively horizontally, and the protruding positions of the elastic blocks 26 can be against the radar body 11.

[0034] It also includes an adjustment mechanism for adjusting the distance between the two protection boxes 23, the adjustment mechanism includes a chamber 30 opened inside the mounting platform 10, a bidirectional screw 31 rotatably connected to the chamber 30, and a driving member for driving the bidirectional screw 31 to rotate, the chamber 30 is communicated with the slide groove 22, the two protection boxes 23 are respectively threadedly connected to the two ends of the bidirectional screw 31, the driving member is a motor 32, the motor 32 is fixed to the mounting platform 10, and the output shaft of the motor 32 is coaxially connected to the bidirectional screw 31.

[0035] It also includes a linkage mechanism that adjusts the distance between the two clamping arms 25 in the protection box 23 as the protection box 23 moves. The linkage mechanism includes a fixed block 40 fixed to the mounting table 10, a wedge block 41 fixed to the clamping arm 25, and a first spring 42 fixed between the clamping arm 25 and the side groove 24. Through holes 43 are provided on both sides of the side wall of the fixed block 40, and the side wall of the through hole 43 is provided with a wedge surface 44 for squeezing the wedge block 41; the wedge block 41 can move vertically in the side groove 24, and the wedge block 41 passes through the through hole 43, and the wedge block 41 can move horizontally and vertically in the through hole 43.

[0036] An extension block 50 is fixedly connected to the wedge block 41, and an elastic layer 51 is fixedly connected to one end of the extension block 50 away from the wedge block 41, and the elastic layer 51 is a rubber layer; vertical plates 52 are fixedly connected to both sides of the mounting platform 10 located on the placing platform 21, and the spacing between the two vertical plates 52 is greater than the spacing between the two fixed blocks 40. Vertical holes 53 are opened on both sides of the side walls of the vertical plates 52, that is, the two vertical holes 53 are respectively arranged at the upper and lower positions of the vertical plates 52, and the extension block 50 and the elastic layer 51 both pass through the vertical holes 53. The extension block 50 can move vertically and horizontally in the vertical holes 53. The vertical holes 53 are located on the movement trajectory of the elastic layer 51, and the width of the vertical holes 53 is less than the width of the elastic layer 51. The width of the vertical hole 53 gradually decreases from one end of the vertical hole 53 close to the end of the vertical plate 52 to the end of the vertical hole 53 close to the adjacent vertical hole 53, that is, the width of the upper vertical hole 53 on the vertical plate 52 gradually decreases from top to bottom, and the width of the lower vertical hole 53 on the vertical plate 52 gradually decreases from bottom to top; the extension block 50 can frictionally contact with the vertical hole 53 at the point where the width is the smallest.

[0037] The fixed block 40 has an inner chamber 60, and the inner chamber 60 has wall grooves 61 on both the upper and lower sides, and the wall grooves 61 are connected to the through hole 43; a rotating shaft 62 is rotatably connected to the inner chamber 60, and an elliptical block 63 is coaxially connected to the rotating shaft 62, and the two long axis ends of the elliptical block 63 can respectively pass through the two wall grooves 61 and abut against the two wedge blocks 41; it also includes a power mechanism that drives the rotating shaft 62 to rotate as the spacing between the two wedge blocks 41 on the fixed block 40 changes, and the power mechanism includes a gear 70 coaxially connected to the rotating shaft 62, and a gear 70 fixedly connected to the inner chamber 60 and located at the gear 70 The guide plates 71 on the upper and lower sides are vertically connected with racks 72, and a second spring 73 is fixed between the rack 72 and the guide plate 71. The rack 72 can move vertically in the wall groove 61 and the through hole 43, and the rack 72 is located on the movement trajectory of the wedge block 41; the two racks 72 are respectively located on the left and right sides of the gear 70, and the movement directions of the two racks 72 are opposite, and the rack 72 is meshed with the gear 70; on the rotating shaft 62, from the back side of the fixed block 40 to the front side of the fixed block 40, there are cam 82, elliptical block 63, and gear 70 in sequence.

[0038] A push block 80 is laterally slidably connected to the fixed block 40, and the push block 80 extends into the inner chamber 60. A third spring 81 is fixedly connected between the push block 80 and the inner chamber 60. A guide hole is opened on the side wall of the protection box 23, and the guide hole is located between the two side grooves 24. The push block 80 passes through the through hole 43 and abuts against the raised position of the elastic block 26. The push block 80 can move laterally in the guide hole. A cam 82 is coaxially connected to the rotating shaft 62, and the cam 82 abuts against the push block 80.

[0039] The specific implementation process is as follows:

[0040] When in use, the radar body 11 is placed on the mounting platform 10 . The width of the radar body 11 is greater than the width of the mounting platform 10 , so that workers can take and place the radar body 11 .

[0041] The motor 32 is started, and the output shaft of the motor 32 drives the bidirectional screw 31 to rotate, so that the two protection boxes 23 are brought closer, and then the two sides of the radar body 11 enter the two protection boxes 23 respectively.

[0042] During the approach of the two protection boxes 23, the protection box 23 moves laterally, and the protection box 23 drives the wedge block 41 to move laterally through the clamping arm 25, so that the wedge block 41 moves laterally in the through hole 43; the protection box 23 continues to move laterally, so that the wedge block 41 is squeezed by the wedge surface 44 to move vertically, so that the two wedge blocks 41 are close to each other; during the vertical movement of the wedge block 41, the wedge block 41 drives the clamping arm 25 to move vertically, that is, the two clamping arms 25 are close to each other, so that the two clamping arms 25 are respectively against the upper and lower sides of the radar body 11, and the first spring 42 is stretched; the motor 32 is turned off to achieve the positioning of the protection box 23, and then the positioning of the clamping arm 25 is achieved, that is, the radar body 11 is clamped and positioned using the two clamping arms 25.

[0043] When the two clamping arms 25 are close to each other, the distance between the two ends of the elastic block 26 is reduced, and the convex amplitude of the elastic block 26 is larger. When the two clamping arms 25 clamp the radar body 11, the convex position of the elastic block 26 abuts against the radar body 11, so that the elastic blocks 26 on the left and right sides abut against the left and right sides of the radar body 11, that is, the radar body 11 is clamped and positioned by the two elastic blocks 26. Therefore, this solution can position the radar body 11 in the horizontal direction and the vertical direction, and the positioning effect is better.

[0044] During the lateral movement of the wedge block 41, the wedge block 41 drives the extension block 50 to move lateral, so that the extension block 50 moves lateral in the vertical hole 53; during the vertical movement of the wedge block 41, the wedge block 41 drives the extension block 50 to move vertically, so that the extension block 50 moves vertically to the minimum width position of the vertical hole 53, so that the extension block 50 is in frictional contact with the minimum width position of the vertical hole 53, and the movement of the extension block 50 is hindered by friction force, and then the extension block 50 limits the clamping arm 25 through the wedge block 41, further strengthening the clamping effect of the two clamping arms 25 on the radar body 11; during the movement of the extension block 50, the extension block 50 drives the elastic layer 51 to move synchronously, so that the elastic layer 51 extends into the vertical hole 53, and the elastic layer 51 is deformed and stuck in the vertical hole 53, so as to hinder the movement of the extension block 50, and then the extension block 50 limits the clamping arm 25 through the wedge block 41, further strengthening the clamping effect of the two clamping arms 25 on the radar body 11.

[0045] When the two clamping arms 25 approach each other, the clamping arms 25 squeeze the rack 72 to move vertically, and the second spring 73 is compressed; when the rack 72 moves, the rack 72 meshes with the gear 70 to drive the rotating shaft 62 to rotate, and the rotating shaft 62 drives the elliptical block 63 to rotate, so that the two long axis ends of the elliptical block 63 respectively abut against the upper and lower wedge blocks 41, which can limit the wedge blocks 41, and then limit the clamping arms 25, further strengthening the clamping effect of the two clamping arms 25 on the radar body 11.

[0046] During the rotation of the rotating shaft 62, the rotating shaft 62 drives the cam 82 to rotate synchronously, and the raised portion of the cam 82 is used to squeeze the push block 80 to move laterally, and the third spring 81 is compressed; during the lateral movement of the push block 80, the end of the push block 80 away from the cam 82 is against the raised position of the elastic block 26, thereby limiting the elastic block 26 and further strengthening the clamping effect of the two elastic blocks 26 on the radar body 11.

[0047] The above is only an embodiment of the present invention, and the common knowledge such as the known specific technical solutions and / or characteristics in the solution is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the present invention, several modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A ground-based radar fixing device for monitoring micro-deformation of tunnel surrounding rock, comprising a mounting platform and a radar body, characterized in that: A groove is provided on the mounting platform, a placing platform is provided on the groove, and the width of the radar body is greater than the width of the placing platform; the bottom of the groove is located on both sides of the placing platform and slide grooves are provided, and a protection box with side wall openings is slidably connected in the slide grooves; side grooves are provided on both sides of the side walls of the protection box, and clamping arms are slidably connected in the side grooves; it also includes an adjustment mechanism for adjusting the distance between the two protection boxes and a linkage mechanism for adjusting the distance between the two clamping arms in the protection box as the protection box moves.

2. The ground-based radar fixing device for monitoring micro-deformation of tunnel surrounding rock according to claim 1 is characterized in that: An elastic block is arranged between two clamping arms in the protection box. The elastic block is arc-shaped. The protruding directions of the elastic blocks in the two protection boxes are arranged relatively in the horizontal direction.

3. The ground-based radar fixing device for monitoring micro-deformation of tunnel surrounding rock according to claim 2 is characterized in that: The linkage mechanism includes a fixed block fixed to the mounting platform, a wedge block fixed to the clamping arm, and a first spring fixed between the clamping arm and the side groove. Through holes are provided on both sides of the side wall of the fixed block, and the side walls of the through holes are provided with wedge surfaces for squeezing the wedge blocks; the wedge blocks can move vertically in the side grooves, and the wedge blocks pass through the through holes, and the wedge blocks can move horizontally and vertically in the through holes.

4. The ground-based radar fixing device for monitoring micro-deformation of tunnel surrounding rock according to claim 3 is characterized in that: The adjusting mechanism includes a chamber opened inside the mounting platform, a bidirectional screw rotatably connected to the chamber, and a driving member for driving the bidirectional screw to rotate. The chamber is communicated with the slide slot, and two protection boxes are respectively threadedly connected to the two ends of the bidirectional screw.

5. The ground-based radar fixing device for monitoring micro-deformation of tunnel surrounding rock according to claim 4 is characterized in that: An extension block is provided on the wedge block, and an elastic layer is provided on the extension block; vertical plates are provided on both sides of the mounting platform located on the placing platform, the spacing between the two vertical plates is greater than the spacing between the two fixed blocks, vertical holes are provided on both sides of the side walls of the vertical plates, the extension block and the elastic layer both pass through the vertical holes, the extension block can move vertically and horizontally in the vertical holes, the vertical holes are located on the movement trajectory of the elastic layer, and the width of the vertical holes is less than the width of the elastic layer.

6. The ground-based radar fixing device for monitoring micro-deformation of tunnel surrounding rock according to claim 5 is characterized in that: The width of the vertical hole gradually decreases from one end of the vertical hole close to the end of the vertical plate to one end of the vertical hole close to the adjacent vertical hole, and the extension block can frictionally contact with the smallest width of the vertical hole.

7. The ground-based radar fixing device for monitoring micro-deformation of tunnel surrounding rock according to claim 6 is characterized in that: An inner chamber is provided inside the fixed block, and wall grooves are provided on both sides of the inner chamber, which are communicated with the through hole; a rotating shaft is rotatably connected in the inner chamber, and an elliptical block is coaxially connected to the rotating shaft, and the two long axis ends of the elliptical block can respectively pass through the two wall grooves and abut against the two wedge blocks; it also includes a power mechanism that drives the rotating shaft to rotate as the spacing between the two wedge blocks on the fixed block changes.

8. The ground-based radar fixing device for monitoring micro-deformation of tunnel surrounding rock according to claim 7 is characterized in that: The power mechanism includes a gear coaxially connected to the rotating shaft, and a guide plate fixed in the inner chamber and located on both sides of the gear. A rack is vertically connected to the guide plate, and a second spring is provided between the rack and the guide plate. The rack can move vertically in the wall groove and the through hole, and the rack is located on the movement trajectory of the wedge block; the two racks are respectively located on both sides of the gear, and the rack is meshed with the gear.

9. The ground-based radar fixing device for monitoring micro-deformation of tunnel surrounding rock according to claim 8 is characterized in that: A push block is connected to the fixed block in a transverse sliding manner, the push block extends into the inner chamber, and a third spring is provided between the push block and the inner chamber; a guide hole is provided on the side wall of the protection box, the guide hole is located between the two side grooves, the push block passes through the through hole and abuts against the raised position of the elastic block, and the push block can move laterally in the guide hole; a cam is coaxially connected to the rotating shaft, and the cam abuts against the push block.

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