Bridge construction waterproof layer thickness detection device and detection method

Abstract

The present invention relates to the technical field of highway bridge detection, specifically to a bridge construction waterproof layer thickness detection device and detection method, comprising a reference box buried under the waterproof layer and a handheld detection tube, wherein a reference magnet is arranged in the reference box. The bridge construction waterproof layer thickness detection device and detection method measures the thickness of the waterproof layer according to the downward movement degree of the identification ring. Compared with the traditional method of measuring the thickness by nailing through the waterproof layer, the magnetic induction is used, and the detection personnel do not need to drill the nails, thus avoiding physical operation. The device can be automatically detected by putting it down, which improves the convenience of detection, and will not cause damage to the waterproof layer, thus avoiding the subsequent impact of the nail penetration of the waterproof layer.

Description

Technical Field

[0001] The invention relates to the technical field of highway bridge detection, and in particular to a device and method for detecting the thickness of a waterproof layer during bridge construction. Background Art

[0002] During the construction of highway bridges, waterproof layers need to be laid on the road surface and bridge deck. The thickness of the waterproof layer needs to be strictly controlled. If the thickness of the waterproof layer is too small, the waterproof ability of the bridge deck will be insufficient, which will seriously endanger the service life of the bridge. Therefore, the waterproof layer needs to be tested to avoid safety hazards caused by it being too thin.

[0003] Utility model patent CN215810583U discloses a bridge deck waterproofing layer laying thickness detection device for railway bridge construction, including a short tube and a chassis, the short tube is fixed to the middle of the top of the chassis, and the bottom of the chassis is provided with a perforation, and the perforation is connected to the short tube, the interior of the short tube is provided with a horizontal bar, the bottom of the horizontal bar is fixed with a connecting rod, the bottom end of the connecting rod is fixed with a thin rod, the inner wall of the short tube is provided with a scale mark, the front of the short tube is provided with an observation window, and the inner side of the observation window is provided with a magnifying glass, the thin rod is specifically a steel needle made of stainless steel material, and the bottom end of the thin rod is provided with a spike, the diameter of the thin rod is adapted to the inner diameter of the perforation, and when the thin rod is at the highest point, the bottom end of the thin rod is flush with the bottom surface of the chassis. This type of detection equipment mainly relies on nailing through the waterproof layer to measure its thickness. On the one hand, the operation is time-consuming and labor-intensive, and it is inconvenient to use. On the other hand, it will cause damage to the waterproof layer, which is not suitable for practical use.

[0004] In view of this, we propose a device and method for detecting the thickness of the waterproof layer in bridge construction. Summary of the invention

[0005] The purpose of the present invention is to provide a device and method for detecting the thickness of a waterproof layer in bridge construction, so as to solve the problem in the above background technology that the prior art mainly relies on nailing through the waterproof layer to measure its thickness, which is time-consuming and labor-intensive to operate and inconvenient to use, and which will cause damage to the waterproof layer and is not suitable for practical use.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A device for detecting the thickness of a waterproof layer for bridge construction, comprising a reference box buried under the waterproof layer and a handheld detection tube, characterized in that: a reference magnet is arranged in the reference box, and a detector matched with the reference magnet is arranged in the detection tube;

[0008] The detector includes a top cover installed on the inner top of the detection cylinder, and a handle is provided on the top cover;

[0009] A floating magnet is movably arranged in the detection cylinder, and the floating magnet is composed of a ring frame and a magnet whose outer ring forms a ring array, and a tension spring is arranged between the floating magnet and the top cover, and the two ends of the tension spring are respectively connected to the floating magnet and the top cover;

[0010] The outer part of the detection cylinder is movably sleeved with an identification ring, and the inner ring of the identification ring is fixedly provided with a plurality of circular magnetic heads. The outer surface of the detection cylinder is vertically provided with a plurality of vertical grooves, and the circular magnetic heads can be slidably extended into the corresponding vertical grooves. The outer surface of the detection cylinder is provided with a scale used in conjunction with the identification ring.

[0011] The identification ring is magnetically limited by a circular magnetic head and a floating magnet, and keeps synchronous movement;

[0012] The detection tube, the top cover, the reference box and the reference magnet are provided with a magnetizer.

[0013] Furthermore, the magnetizer includes a vertical shaft mounted on the top cover, and the top cover and the detection cylinder can rotate relative to each other;

[0014] The handle is composed of a grip, a bottom bar and a side bar therebetween, and both ends of the side bar are respectively connected to the ends on the same side of the grip and the bottom bar, and the bottom bar is fixedly connected to the top end of the vertical axis;

[0015] The bottom end of the vertical shaft passes through the top cover and extends to the inside of the detection cylinder, and a plurality of slide grooves are vertically opened on the surface of the vertical shaft, a bracket is sleeved on the outer ring of the vertical shaft, and the bracket is slidably connected along the slide groove in the up and down directions, and the bracket is fixedly connected to the floating magnet;

[0016] A ring rail is fixedly embedded on the inner side wall of the reference box, and a plurality of bottom brackets are fixedly installed on the bottom of the reference magnet, and the bottom brackets are slidably connected to the ring rail;

[0017] The top of the reference magnet is fixedly connected with an isolation disk, and a magnetic coupling block is fixedly embedded on the isolation disk;

[0018] An armature is fixedly arranged in the reference box, and the armature is located inside the reference magnet;

[0019] A conductive bar is arranged inside the reference box, and the two ends of the conductive bar are respectively connected to the armature and the ring rail for mutual conduction, and the conductive bar and the armature can rotate relative to each other;

[0020] A conductive coil is wound around the reference magnet, and the terminal of the conductive coil passes through the bottom bracket and extends into the ring rail for fitting and conduction.

[0021] Furthermore, the bracket includes a sliding sleeve movably sleeved on the surface of the vertical shaft, and the surface of the sliding sleeve is fixedly connected to a plurality of support plates corresponding to the arc groove, and the inner end of the support plate extends into the sliding groove;

[0022] The inner ring of the floating magnet is fixedly mounted with a plurality of buckles corresponding to the support plate, and the buckle surface is cut into a concave spherical surface on the side opposite to the support plate, and the support plate surface is cut into a convex spherical surface on the side opposite to the buckle, and the buckle is rollingly connected with the convex spherical surface on the support plate through the concave spherical surface.

[0023] Furthermore, the top cover is detachably connected to the detection cylinder via fixing bolts.

[0024] Furthermore, a circular sleeve is rotatably sleeved on the surface of the side rod.

[0025] Furthermore, a limiting groove is provided on the convex spherical surface, a limiting block is provided on the concave spherical surface, and the limiting block is located in the limiting groove.

[0026] A detection method for the above-mentioned bridge construction waterproof layer thickness detection device comprises the following steps:

[0027] S1. During the construction of highway bridges, the benchmark box is buried under the waterproof layer and recording points are set;

[0028] S2, place the detection tube on the waterproof layer by the handle, align the detection tube with the reference box, and the reference magnet in the box magnetically attracts and pulls the floating magnet in the detection tube, so that the floating magnet stretches the tension spring and moves downward. In this process, the floating magnet synchronously pulls the identification ring along the circular magnetic head to move downward, and the identification ring is compared with the scale to determine the thickness of the waterproof layer. Repeat step S2 to detect the thickness of each position of the waterproof layer;

[0029] S3. When the waterproof layer is laid, the road below it deforms, and the reference box and the reference magnet inside it deflect accordingly. At this time, when the waterproof layer thickness is detected by the detection tube, the floating magnet inside is pulled by different magnetic forces, that is, the magnetic attraction force is large at the position with small spacing, and the magnetic attraction force is small at the position with large spacing, so that the floating magnet deflects along the support plate through the block and pulls the identification ring to deflect, so that the detection personnel can know the deformation under the waterproof layer;

[0030] S4. After the test is completed, the reference box is left in the road body. In the future, the user can determine whether the road body thickness is qualified by locating the position of the reference box. After long-term use, the user can grasp the side rod to push the top cover and the vertical axis to rotate, and drive the floating magnet to rotate through the bracket. In this process, the reference magnet is driven to rotate along the ring track through the cooperation of the magnetic coupling block and the floating magnet, so as to cooperate with the armature to cut the magnetic flux lines. The generated current is transmitted to the conductive coil along the ring track through the conductive strip, so that the conductive coil generates a magnetic field around the reference magnet to supplement its magnetism.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] In the present invention, the floating magnet in the detection tube is magnetically attracted and pulled by the reference magnet in the reference box, so that the floating magnet stretches the tension spring to move downward. In this process, the floating magnet synchronously pulls the identification ring along the circular magnetic head to move downward, and the identification ring is compared with the scale to determine the thickness of the waterproof layer. The thickness of the waterproof layer is measured according to the downward movement of the identification ring. Compared with the traditional method of measuring the thickness by nailing through the waterproof layer, the use of magnetic induction does not require the detection personnel to drill nails, thus avoiding physical operation. The test can be automatically performed after it is put down, thereby improving the convenience of detection, and will not cause damage to the waterproof layer, thus avoiding subsequent impact on the nail-pierced part of the waterproof layer.

[0033] In the present invention, the top cover and the vertical axis are pushed to rotate by grasping the side rod, and the floating magnet is driven to rotate through the bracket. During this process, the reference magnet that is magnetically connected to the floating magnet through the magnetic coupling block is driven to rotate along the circular track, so as to cooperate with the armature to cut the magnetic flux lines. The generated current is transmitted to the conductive coil along the circular track through the conductive strip, so that the conductive coil generates a magnetic field around the reference magnet to supplement the magnetism thereof, thereby avoiding demagnetization of the reference magnet due to long-term use and high temperature conditions that affects the detection effect, and can extend the service life of related detection equipment. In addition, the above-mentioned supplementary magnetization does not require breaking the waterproof layer or taking out the reference box, which is more in line with actual use.

[0034] In the present invention, when the inside of the road body under the waterproof layer is deformed, the reference box and the reference magnet inside are deflected accordingly. At this time, when the detection tube is used to detect the thickness of the waterproof layer, the floating magnet inside it is pulled by different magnetic forces, that is, the magnetic attraction force is large at the position with small spacing, and the magnetic attraction force is small at the position with large spacing, so that the floating magnet is deflected along the support plate through the block, and pulls the identification ring to tilt. The inspection personnel can learn that there is deformation under the waterproof layer, which is convenient for subsequent reporting and early repair work, and avoids the expansion of internal hidden damage below the road surface to cause safety hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0036] Figure 2 It is a three-dimensional structural cross-sectional view of the detection tube of the present invention;

[0037] Figure 3 It is a front cross-sectional view of the detection tube of the present invention;

[0038] Figure 4 It is a schematic diagram of the structure of the vertical axis, bracket and floating magnet in the present invention;

[0039] Figure 5 An exploded view of the bracket in the present invention;

[0040] Figure 6 It is a schematic diagram of the structure of the handle, side bar and bottom bar of the present invention;

[0041] Figure 7 It is a three-dimensional structural schematic diagram of the reference box of the present invention;

[0042] Figure 8 An exploded view of the reference box and the reference magnet in the present invention;

[0043] Fig. 9 A bottom view of the floating magnet and the conductive coil in the present invention;

[0044] Fig.10 It is a structural schematic diagram of the floating magnet and the corresponding magnetic coupling block in the present invention.

[0045] In the figure: 1. reference box; 2. detection tube; 3. reference magnet; 4. detector; 41. top cover; 42. carrying handle; 421. grip; 422. bottom rod; 423. side rod; 43. floating magnet; 44. tension spring; 45. identification ring; 46. round magnetic head; 47. vertical slot; 48. scale; 49. magnetizer; 491. vertical axis; 492. slide slot; 493. bracket; 4931. sliding sleeve; 4932. support plate; 4933. buckle; 4934. concave spherical surface; 4935. convex spherical surface; 494. ring rail; 495. bottom support; 496. armature; 497. conductive strip; 498. conductive coil; 499. magnetic coupling block; 4910. isolation disk. DETAILED DESCRIPTION

[0046] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technical staff in this field without creative work are within the scope of protection of the present invention.

[0047] See also Figures 1 to 10 The present invention provides a technical solution: a device for detecting the thickness of a waterproof layer during bridge construction, comprising a reference box 1 buried under the waterproof layer and a handheld detection tube 2, wherein a reference magnet 3 is arranged in the reference box 1, and a detector 4 matched with the reference magnet 3 is arranged in the detection tube 2. When in use, the reference box 1 needs to be buried under the waterproof layer during the construction of a highway bridge, and a recording point is set, and then the thickness of the waterproof layer is detected by the detector 4.

[0048] In this embodiment, Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figures 5 to 10As shown, the detector 4 includes a top cover 41 installed on the inner top of the detection cylinder 2, and a handle 42 is provided on the top cover 41. The detection cylinder 2 is placed on the waterproof layer through the handle 42 to align the detection cylinder 2 with the reference box 1.

[0049] A floating magnet 43 is movably arranged in the detection tube 2. The floating magnet 43 consists of a ring frame and a magnet in a ring array on the outer ring. The magnets in the array can be exposed or buried in the ring frame. The ring frame is made of non-magnetic material, such as hard plastic, and a tension spring 44 is arranged between the floating magnet 43 and the top cover 41. The two ends of the tension spring 44 are respectively connected to the floating magnet 43 and the top cover 41.

[0050] An identification ring 45 is movably sleeved on the outside of the detection cylinder 2, and a plurality of circular magnetic heads 46 are fixedly provided on the inner ring of the identification ring 45. A plurality of vertical grooves 47 are vertically provided on the outer surface of the detection cylinder 2. The circular magnetic heads 46 correspond to the vertical grooves 47 one by one. The circular magnetic heads 46 on the identification ring 45 can be slidably inserted into the corresponding vertical grooves 47. The identification ring 45 slides vertically in the up and down directions through the circular magnetic heads 46. A scale 48 used in conjunction with the identification ring 45 is provided on the outer surface of the detection cylinder 2.

[0051] The identification ring 45 is magnetically limited by the circular magnetic head 46 and the magnets of the array of the floating magnet 43. The reference magnet 3 in the reference box 1 magnetically pulls the floating magnet 43 in the detection tube 2, so that the floating magnet 43 stretches the tension spring 44 to move downward. In this process, the floating magnet 43 synchronously pulls the identification ring 45 downward through the circular magnetic head 46, and the identification ring 45 is compared with the scale 48 to determine the maximum thickness of the waterproof layer.

[0052] A magnetizer 49 is provided on the detection tube 2 , the top cover 41 , the reference box 1 and the reference magnet 3 .

[0053] In this embodiment, Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figures 5 to 10 As shown, the magnetizer 49 includes a vertical shaft 491 installed on the top cover 41, and the top cover 41 and the detection cylinder 2 can rotate relative to each other.

[0054] The handle 42 is composed of a grip 421 , a bottom rod 422 and a side rod 423 therebetween, and both ends of the side rod 423 are respectively connected to the ends of the grip 421 and the bottom rod 422 on the same side, and the bottom rod 422 is fixedly connected to the top of the vertical axis 491 .

[0055] The bottom end of the vertical shaft 491 passes through the top cover 41 and extends to the inside of the detection tube 2, and a plurality of slide grooves 492 are vertically opened on the surface of the vertical shaft 491, and a plurality of brackets 493 are arranged around the outer ring of the vertical shaft 491. The inner end of each bracket 493 is provided with a guide portion that can slide into the corresponding slide groove 492. The bracket 493 is arranged in the floating magnet 43, and the outer end of the bracket 493 is connected to the bracket 493. The gripping side rod 423 pushes the top cover 41 and the vertical shaft 491 to rotate, and drives the floating magnet 43 to rotate through the bracket 493.

[0056] A ring rail 494 is fixedly embedded on the inner wall of the reference box 1, and a plurality of base supports 495 are fixedly installed on the bottom of the reference magnet 3. The outer ends of the base supports 495 are slidably connected to the ring rail 494, and the reference magnet 3 is connected along the ring rail 494 through the base supports 495. The reference magnet 3 magnetically connected to the floating magnet 43 is driven to rotate along the ring rail 494.

[0057] The top of the reference magnet 3 is fixedly connected to an isolation disk 4910, and the top surface of the isolation disk 4910 and the bottom surface of the floating magnet 43 are fixedly embedded with magnetic coupling blocks 499 that cooperate with each other. The magnetic coupling blocks 499 on the surfaces of both are in a ring array, and the specific number is freely selected according to actual coupling requirements. The number of magnetic coupling blocks 499 on the isolation disk 4910 is equal to the number of magnetic coupling blocks 499 on the floating magnet 43, and the magnetic coupling blocks 499 on the isolation disk 4910 and the magnetic coupling blocks 499 on the floating magnet 43 attract each other.

[0058] An armature 496 is disposed in the reference box 1 , and the armature 496 is located inside the reference magnet 3 .

[0059] The inside of the reference box 1 is provided with a conductive strip 497, and the two ends of the conductive strip 497 are respectively connected to the armature 496 and the ring rail 494 for mutual conduction. In this embodiment, a commutator is provided on the armature 496, and brushes are installed on the conductive strips 497 on both sides. The brushes and the commutator ensure the conduction between the armature 496 and the two conductive strips 497, and ensure that the conductive coil 498 generates direct current.

[0060] A conductive coil 498 is wound around the reference magnet 3, and the terminal of the conductive coil 498 extends through the base 495 into the ring track 494 and is in contact with the ring track 494. The reference magnet 3 rotates and cooperates with the armature 496 to cut the magnetic flux lines. The generated current is transmitted to the conductive coil 498 along the ring track 494 via the conductive strip 497, so that the conductive coil 498 generates a magnetic field around the reference magnet 3 to supplement its magnetism.

[0061] In this embodiment, Figure 1 , Figure 2 , Figure 3 , Figure 4, Figures 5 to 10 As shown, the bracket 493 includes a sliding sleeve 4931 movably sleeved on the surface of the vertical shaft 491, and the surface of the sliding sleeve 4931 is fixedly connected to a plurality of support plates 4932 corresponding to the arc groove to form a guide portion, and the inner end of the support plate 4932 extends into the slide groove 492, and the sliding sleeve 4931 is slidably connected along the slide groove 492 through the support plate 4932 and can maintain synchronous rotation.

[0062] The inner ring of the floating magnet 43 is fixedly mounted with a plurality of buckles 4933 corresponding to the support plate 4932, and the surface of the buckle 4933 is cut into a concave spherical surface 4934 on the side of the support plate 4932, and the surface of the support plate 4932 is cut into a convex spherical surface 4935 on the side of the buckle 4933. The inner side of the floating magnet 43 is fixedly connected to each buckle 4933, and each buckle 4933 is slidably connected to the corresponding convex spherical surface 4935 of the support plate 4932 through the concave spherical surface 4934. 4933 can form a rolling connection along the vertical axis 491 as the base point through the concave spherical surface 4934 and the convex spherical surface 4935 on the support plate 4932. When the reference box 1 and the internal reference magnet 3 are deflected, when the detection tube 2 is detecting, the floating magnet 43 inside it is pulled by different magnetic forces, that is, the magnetic attraction force is large at the position with a small spacing, and the magnetic attraction force is small at the position with a large spacing, so that the floating magnet 43 is deflected along the support plate 4932 through the buckle 4933, and pulls the identification ring 45 to be skewed.

[0063] In this embodiment, Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figures 5 to 10 As shown, the top cover 41 is connected to the detection tube 2 by a fixing bolt. The fixing bolt is rotated downward to connect the detection tube 2 to the top cover 41, thereby locking the top cover 41, the handle 42, and the vertical axis 491 to prevent the floating magnet 43 from rotating and affecting the detection.

[0064] In this embodiment, Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figures 5 to 10 As shown, a round sleeve is rotatably sleeved on the surface of the side rod 423. When the user operates the side rod 423, he grasps the round sleeve to avoid friction between the rotation of the side rod 423 and the palm, making it easy to use.

[0065] In this embodiment, Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figures 5 to 10As shown, a limiting groove is opened on the convex spherical surface 4935, and a limiting block is set on the concave spherical surface 4934, and the limiting block is located in the limiting groove. The limiting block limits the rolling of the buckle 4933 and the floating magnet 43 along the limiting groove, so that they will not rotate laterally or fall off, thereby ensuring the stability of operation.

[0066] The detection method of the bridge construction waterproof layer thickness detection device comprises the following steps:

[0067] S1. During the construction of the highway bridge, the reference box 1 is buried under the waterproof layer and recording points are set;

[0068] S2. When the waterproof layer needs to be inspected after laying, the inspection tube 2 is placed on the waterproof layer through the handle 421, so that the inspection tube 2 is aligned with the reference box 1, and the reference magnet 3 in the box magnetically attracts and pulls the floating magnet 43 in the inspection tube 2, so that the floating magnet 43 stretches the tension spring 44 to move downward. In this process, the floating magnet 43 synchronously pulls the identification ring 45 downward along the circular magnetic head 46, and the identification ring 45 is compared with the scale 48 to determine the thickness of the waterproof layer. Repeat step S2 to detect the thickness of each position of the waterproof layer;

[0069] S3. When the waterproof layer is laid and the lower road body is deformed, the reference box 1 and the reference magnet 3 inside are deflected accordingly. At this time, when the waterproof layer thickness is detected by the detection tube 2, the floating magnet 43 inside is pulled by different magnetic forces, that is, the magnetic attraction force is large at the position with small spacing, and the magnetic attraction force is small at the position with large spacing, so that the floating magnet 43 is deflected along the support plate 4932 through the block, and the identification ring 45 is pulled to be skewed, so that the detection personnel can know the deformation under the waterproof layer;

[0070] S4. After the detection is completed, the reference box 1 is left in the road body. In the future, the user can determine the thickness of the road body by locating the position of the reference box 1. After long-term use, the user can grasp the side rod 423 to push the top cover 41 and the vertical shaft 491 to rotate, and drive the floating magnet 43 to rotate through the bracket 493. In this process, the reference magnet 3 is driven to rotate along the ring track 494 through the cooperation of the magnetic coupling block 499 and the floating magnet 43, so as to cooperate with the armature 496 to cut the magnetic flux line. The generated current is transmitted to the conductive coil 498 along the ring track 494 through the conductive strip 497, so that the conductive coil 498 generates a magnetic field around the reference magnet 3 to supplement its magnetism. It should be noted here that the reference magnet 3 and the magnetic coupling block 499 on the isolation disk 4910 are attracted to the magnetic coupling block 499 of the floating magnet 43, and the existence of the magnetic coupling block 499 on the isolation disk 4910 can make the floating magnet 43 drive the reference magnet 3 to rotate.

[0071] The above shows and describes the basic principles, main features and advantages of the present invention. Technical personnel in this industry should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only preferred examples of the present invention and are not used to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A device for detecting the thickness of a waterproof layer for bridge construction, comprising a reference box (1) buried under the waterproof layer and a handheld detection tube (2), characterized in that: The reference box (1) is provided with a reference magnet (3), and the detection cylinder (2) is provided with a detector (4) that matches the reference magnet (3); The detector (4) comprises a top cover (41) mounted on the inner top of the detection tube (2), and a handle (42) is provided on the top cover (41); A floating magnet (43) is movably arranged in the detection cylinder (2), the floating magnet (43) is composed of a ring frame and a magnet in an annular array on its outer ring, and a tension spring (44) is arranged between the floating magnet (43) and the top cover (41), and the two ends of the tension spring (44) are respectively connected to the floating magnet (43) and the top cover (41); The outer part of the detection cylinder (2) is movably sleeved with an identification ring (45), and the inner ring of the identification ring (45) is fixedly provided with a plurality of circular magnetic heads (46); the outer surface of the detection cylinder (2) is vertically provided with a plurality of vertical grooves (47), and the circular magnetic heads (46) can be slidably inserted into corresponding vertical grooves (47); the outer surface of the detection cylinder (2) is provided with a scale (48) for use in conjunction with the identification ring (45); The identification ring (45) is magnetically limited by the circular magnetic head (46) and the floating magnet (43), and maintains synchronous movement; A magnetizer (49) is provided on the detection tube (2), the top cover (41), the reference box (1) and the reference magnet (3).

2. The device for detecting thickness of waterproof layer for bridge construction according to claim 1 is characterized in that: The magnetizer (49) comprises a vertical shaft (491) mounted on the top cover (41), and the top cover (41) and the detection cylinder (2) are relatively rotatable. The handle (42) is composed of a grip (421), a bottom rod (422) and a side rod (423) therebetween, and two ends of the side rod (423) are respectively connected to the ends of the grip (421) and the bottom rod (422) on the same side, and the bottom rod (422) is fixedly connected to the top end of the vertical axis (491); The bottom end of the vertical shaft (491) passes through the top cover (41) and extends into the interior of the detection tube (2), and a plurality of slide grooves (492) are vertically provided on the surface of the vertical shaft (491), and a bracket (493) is sleeved on the outer ring of the vertical shaft (491), and the bracket (493) is slidably connected along the slide groove (492) in an up-and-down direction, and the bracket (493) is fixedly connected to the floating magnet (43); A ring rail (494) is fixedly embedded on the inner side wall of the reference box (1), and a plurality of bottom brackets (495) are fixedly installed on the bottom of the reference magnet (3), and the bottom brackets (495) are slidably connected to the ring rail (494); The top of the reference magnet (3) is fixedly connected to an isolation disk (4910), and a magnetic coupling block (499) is fixedly embedded on the isolation disk (4910); An armature (496) is fixedly arranged inside the reference box (1), and the armature (496) is located inside the reference magnet (3); A conductive bar (497) is disposed inside the reference box (1), and two ends of the conductive bar (497) are respectively connected to the armature (496) and the ring rail (494) for mutual conduction, and the conductive bar (497) and the armature (496) can rotate relative to each other; A conductive coil (498) is wound around the reference magnet (3), and a terminal of the conductive coil (498) passes through the base (495) and extends into the ring rail (494) for bonding and conduction.

3. The device for detecting thickness of waterproof layer in bridge construction according to claim 2 is characterized in that: The support (493) comprises a sliding sleeve (4931) movably sleeved on the surface of the vertical shaft (491), and the surface of the sliding sleeve (4931) is fixedly connected to a plurality of support plates (4932) corresponding to the arc grooves, and the inner ends of the support plates (4932) extend into the sliding grooves (492); The inner ring of the floating magnet (43) is fixedly mounted with a plurality of buckles (4933) corresponding to the support plate (4932), and the side of the surface of the buckle (4933) relative to the support plate (4932) is cut into a concave spherical surface (4934), and the side of the surface of the support plate (4932) relative to the buckle (4933) is cut into a convex spherical surface (4935), and the buckle (4933) is rollingly connected to the convex spherical surface (4935) on the support plate (4932) via the concave spherical surface (4934).

4. The device for detecting thickness of waterproof layer in bridge construction according to claim 2 is characterized in that: The top cover (41) is detachably connected to the detection cylinder (2) via fixing bolts.

5. The device for detecting thickness of waterproof layer in bridge construction according to claim 2, characterized in that: A circular sleeve is rotatably sleeved on the surface of the side rod (423).

6. The device for detecting thickness of waterproof layer in bridge construction according to claim 3 is characterized in that: A limiting groove is provided on the convex spherical surface (4935), and a limiting block is provided on the concave spherical surface (4934), and the limiting block is located in the limiting groove.

7. A detection method for the bridge construction waterproof layer thickness detection device according to any one of claims 1 to 6, characterized in that: The steps include: S1. During the construction of a highway bridge, bury the reference box (1) under the waterproof layer and set up recording points; S2, placing the detection tube (2) on the waterproof layer by means of the handle (421), so that the detection tube (2) is aligned with the reference box (1), and the reference magnet (3) in the box magnetically attracts and pulls the floating magnet (43) in the detection tube (2), so that the floating magnet (43) stretches the tension spring (44) and moves downward. During this process, the floating magnet (43) synchronously pulls the identification ring (45) along the circular magnetic head (46) and moves downward. The identification ring (45) is compared with the scale (48) to determine the thickness of the waterproof layer, and step S2 is repeated to detect the thickness of each position of the waterproof layer; S3. When the waterproof layer is laid and the lower side of the road body is deformed, the reference box (1) and the reference magnet (3) inside are deflected accordingly. At this time, when the waterproof layer thickness is detected using the detection tube (2), the floating magnet (43) inside is pulled by different magnetic forces, that is, the magnetic attraction force is large at the position with a small spacing, and the magnetic attraction force is small at the position with a large spacing, so that the floating magnet (43) is deflected along the support plate (4932) through the block, and the identification ring (45) is pulled to be skewed, so that the detection personnel can know the deformation under the waterproof layer; S4. After the test is completed, the reference box (1) is left in the road body. In the future, the user can determine whether the thickness of the road body is qualified by locating the position of the reference box (1). After long-term use, the user can grasp the side rod (423) to push the top cover (41) and the vertical shaft (491) to rotate, and drive the floating magnet (43) to rotate through the bracket (493). In this process, the reference magnet (3) is driven to rotate along the ring track (494) through the cooperation of the magnetic coupling block (499) and the floating magnet (43), so as to cooperate with the armature (496) to cut the magnetic flux line. The generated current is transmitted to the conductive coil (498) along the ring track (494) via the conductive strip (497), so that the conductive coil (498) generates a magnetic field around the reference magnet (3) to supplement its magnetism.

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