Hole bottom sediment thickness measuring device

Abstract

The utility model provides a hole bottom sediment thickness measuring device. The hole bottom sediment thickness measuring device comprises a supporting arm, a measuring rope, a measuring needle and a measuring cake. A positioning hole is formed in the supporting arm; the measuring rope is inserted into the positioning hole, and the lower end of the measuring rope is connected with an n-shaped butt joint piece which is provided with a connecting rod; the measuring needle is provided with a strip-shaped hole, and the connecting rod is inserted into the strip-shaped hole, so that the measuring needle can rotate to a horizontal state or a vertical state by taking the connecting rod as an axis; the measuring cake is arranged on the lower side of the supporting arm and provided with an alignment hole, and the lower side face of the measuring cake is provided with a containing groove used for embedding the measuring needle in the horizontal state. Furthermore, an anti-falling structure is arranged between the measuring cake and the supporting arm, so that the measuring cake can be fixed on the lower side surface of the supporting arm. When the probe is replaced, the probe does not need to be detached, and only needs to be rotated to a horizontal state and embedded into the accommodating groove. According to the hole bottom sediment thickness measuring device provided by the invention, the measuring needle and the measuring cake can be quickly replaced at the measuring point position, and the stability of the hole bottom sediment thickness measuring operation efficiency is ensured.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of cast-in-place pile construction, and particularly relates to a hole bottom sediment thickness measuring device. BACKGROUND

[0002] The hole bottom sediment thickness refers to the layer height of the drilling bottom sediments, which usually refers to the particles left by sedimentation or hole collapse during drilling and hole cleaning and not taken away by the circulating mud. In the actual construction process, the size of the hole bottom sediment thickness not only affects the bearing capacity of the pile foundation, but also may have an adverse effect on the stability of the pile body. Therefore, accurately measuring the hole bottom sediment thickness is crucial to ensure the quality of the pile foundation and improve the construction effect of the cast-in-place pile.

[0003] In the prior art, there are various methods for measuring the hole bottom sediment thickness, including the measuring rope method, the measuring hammer method, the measuring needle and measuring cake method, and the resistivity method. Among them, the measuring needle and measuring cake method is relatively simple and commonly used, and the steps are as follows:

[0004] (1) Preparation: soak the measuring rope, and select a position close to the center of the pile as the measuring point;

[0005] (2) Measure the hole bottom depth: install a measuring needle at the end of the measuring rope, then lower the measuring rope from the measuring point to the measuring needle until the measuring needle inserts into the sediment and contacts the hole bottom, during which the measuring rope is kept vertical, and finally the depth mark on the measuring rope is observed and recorded to obtain the hole bottom depth;

[0006] (3) Measure the depth of the top surface of the sediment: replace the measuring needle with a measuring cake, then lower the measuring rope from the measuring point to the measuring cake until the measuring cake touches the top surface of the sediment, during which the measuring rope is kept vertical, and finally the depth mark on the measuring rope is observed and recorded to obtain the depth of the top surface of the sediment;

[0007] (4) Calculate the sediment thickness: according to the records, calculate the sediment thickness; wherein the sediment thickness is equal to the difference between the hole bottom depth and the depth of the top surface of the sediment.

[0008] The inventor finds that this process of replacing the measuring needle with the measuring cake will consume a lot of time, and after replacing the measuring needle with the measuring cake, the measuring rope also needs to be re-aligned with the measuring point, which reduces the efficiency of the hole bottom sediment thickness measuring operation. CONTENT OF THE UTILITY MODEL

[0009] The embodiment of the application provides a hole bottom sediment thickness measuring device, which aims to quickly replace the measuring needle and the measuring cake at the measuring point position, and ensure the stability of the efficiency of the hole bottom sediment thickness measuring operation.

[0010] To achieve the above-mentioned purpose, the technical solution adopted by the application is:

[0011] A hole bottom sediment thickness measuring device is provided, comprising:

[0012] a support arm for being fixed above a drill hole and having a positioning hole formed thereon and extending in a vertical direction for being coaxially arranged with the drill hole;

[0013] a measuring rope for being inserted into the positioning hole so as to be coaxially arranged with the drill hole; the lower end of the measuring rope has a door-shaped adapter, and the adapter has a connecting rod arranged perpendicularly to the measuring rope;

[0014] a measuring needle arranged at the lower end of the measuring rope for being inserted into a sediment; the measuring needle has a strip-shaped hole extending along the length of the measuring needle, and the connecting rod is inserted into the strip-shaped hole so that the measuring needle can be rotated to a horizontal state or a vertical state with the connecting rod as an axis; and

[0015] a measuring disc arranged at the lower side of the support arm and having an alignment hole formed thereon and extending in a vertical direction for being passed through by the measuring rope; and the lower side of the measuring disc has a receiving groove in communication with the alignment hole and adapted for embedding the measuring needle in the horizontal state;

[0016] wherein the measuring disc and the support arm have an anti-disengagement structure for connecting the measuring disc and the support arm so that the measuring disc is fixed at the lower side of the support arm and the alignment hole and the positioning hole are coaxially arranged.

[0017] In a possible implementation, both ends of the support arm are fixedly connected with a mounting base for being supported on the ground, and each mounting base has a limiting member for abutting against the inner wall of the drill hole so as to limit the movement of the mounting base away from the drill hole.

[0018] In a possible implementation, the limiting member comprises:

[0019] a lifting plate arranged at the side of the mounting base facing the drill hole and slidingly connected with the mounting base in a vertical direction; the lifting plate and the mounting base have a distance adjusting structure for adjusting and fixing the lifting plate; and

[0020] a rotating roller slidingly arranged at the lower side of the lifting plate so as to be moved towards or away from the mounting base; and the rotating roller and the lifting plate have a locking structure for limiting the movement of the rotating roller relative to the lifting plate;

[0021] wherein the rotating roller can be inserted into the drill hole by moving the lifting plate downwardly, and the rotating roller can abut against the inner wall of the drill hole by moving the rotating roller towards the mounting base.

[0022] In a possible implementation, the distance adjusting structure comprises:

[0023] A fixing nut is fixedly arranged on the mounting base and has an axial direction parallel to the up-down direction; and

[0024] An adjusting screw is threadedly connected to the fixing nut, and a protruding portion extending radially outward is arranged at a lower end of the adjusting screw to support the lifting plate.

[0025] In a possible implementation, the lifting plate has a reserved hole penetrating in the up-down direction, and the adjusting screw is inserted into the reserved hole so that the protruding portion abuts against the lower side of the lifting plate.

[0026] In a possible implementation, the locking structure comprises:

[0027] A guide hole is arranged on the lifting plate and penetrates in the up-down direction; and

[0028] A connecting bolt is fixedly connected to an upper end of the rotating roller and is inserted into the guide hole to move the rotating roller towards or away from the mounting base; an upper end of the connecting bolt extends to an upper side of the lifting plate, and an anti-slip nut is threadedly connected to the upper side of the lifting plate.

[0029] In a possible implementation, the anti-falling structure comprises:

[0030] A slot is arranged on an outer peripheral wall of the measuring disc; and

[0031] A sliding block is slidingly connected to a lower side of the supporting arm, and an insertion rod is arranged on the sliding block and adapted to be inserted into the slot.

[0032] In a possible implementation, a protruding block connected to the supporting arm is arranged on a side of the sliding block away from the measuring disc, and a spring is arranged between the protruding block and the sliding block.

[0033] Both ends of the spring are connected to the protruding block and the sliding block, respectively; when the insertion rod is withdrawn from the slot, the spring is in an elastic compression state to drive the sliding block to move away from the protruding block.

[0034] In a possible implementation, an anti-bending rod extending towards the protruding block is arranged on the sliding block, the anti-bending rod is inserted into the spring, and the anti-bending rod is slidingly connected to the protruding block.

[0035] In a possible implementation, the positioning hole has a ring-shaped filler arranged around an outer periphery of the measuring rope to fill a gap between the measuring rope and an inner wall of the positioning hole.

[0036] In the embodiment of the present application, the measuring needle is inserted into the inside of the sediment and contacts the hole bottom by lowering the measuring rope, so that the hole bottom depth measurement is completed. Based on this, when the measuring rope is pulled to the drilling opening, the measuring needle is embedded into the accommodating groove by rotating the measuring needle to the horizontal state with the connecting rod as the shaft, and then the anti-disengagement structure is released and the measuring rope is lowered until the measuring pellet contacts the top surface of the sediment, so that the top surface depth measurement of the sediment is completed.

[0037] In the above process, the operation of replacing the measuring needle with the measuring pellet only needs two steps (i.e. rotating the measuring needle and releasing the anti-disengagement structure), without the need to disassemble the measuring needle and repeat the positioning of the measuring rope, thereby improving the efficiency and accuracy of the hole bottom sediment thickness measurement.

[0038] The hole bottom sediment thickness measurement device provided by the embodiment can quickly replace the measuring needle and the measuring pellet at the measurement point position, and ensure the stability of the hole bottom sediment thickness measurement operation efficiency compared with the prior art. BRIEF DESCRIPTION OF DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0040] Figure 1 The hole bottom sediment thickness measurement device provided by the embodiment of the present application is a three-dimensional structure schematic diagram;

[0041] Figure 2 The hole bottom sediment thickness measurement device provided by the embodiment of the present application is a front view structure schematic diagram;

[0042] Figure 3 The structure schematic diagram of the measuring needle and the measuring pellet in the explosion view angle adopted by the embodiment of the present application;

[0043] Figure 4 The structure schematic diagram of the measuring rope and the measuring needle in the explosion view angle adopted by the embodiment of the present application;

[0044] Figure 5 The sectional structure schematic diagram of the measuring rope and the measuring needle in the combined state adopted by the embodiment of the present application;

[0045] Figure 6 The local schematic diagram of the supporting arm and the limiting member in the combined state adopted by the embodiment of the present application;

[0046] Figure 7 The structure schematic diagram of the lifting plate and the adjusting screw in the explosion view angle adopted by the embodiment of the present application;

[0047] Figure 8 A structure schematic view of the limiting member employed by the embodiment of the present application in an explosion perspective;

[0048] Figure 9 A partial enlarged schematic view of the support arm and the measuring rope employed by the embodiment of the present application in an explosion perspective;

[0049] Figure 10 A partial enlarged schematic view of the support arm and the measuring rope employed by the embodiment of the present application in an explosion perspective;

[0050] Reference signs: 1, support arm; 11, positioning hole; 12, mounting seat; 13, protruding block; 14, spring; 2, measuring rope; 21, butt joint; 22, connecting rod; 3, measuring needle; 31, strip-shaped hole; 4, measuring disc; 41, alignment hole; 42, accommodating groove; 5, anti-dropping structure; 51, insertion slot; 52, sliding block; 521, insertion rod; 522, anti-bending rod; 6, limiting member; 61, lifting plate; 611, reserved hole; 62, rotating roller; 7, distance adjusting structure; 71, fixed nut; 72, adjusting screw rod; 721, protruding part; 8, locking structure; 81, guide hole; 82, connecting bolt; 821, anti-slip nut; 9, filling piece. DETAILED DESCRIPTION

[0051] In order to make the technical problems, technical solutions and beneficial effects of the present application clearer, further detailed description will be made to the present application in combination with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, and are not used to limit the present application.

[0052] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0053] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0054] In addition, the terms "first", "second", etc. are used only for descriptive purposes and are not to be construed as indicating or implying relative importance or an indicated number of technical features. Thus, features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0055] Please refer to Figures 1 to 10 , now the hole bottom sediment thickness measuring device provided by the present application will be described. The hole bottom sediment thickness measuring device provided by the present application comprises a support arm 1, a measuring rope 2, a measuring needle 3 and a measuring cake 4.

[0056] The support arm 1 is used to be fixed on the ground and is coaxially arranged above the drilling hole. The support arm 1 has a positioning hole 11 penetrating through the thickness direction thereof; in actual arrangement, the thickness direction of the support arm 1 is parallel to the up-down direction, and the support arm 1 is used to be coaxially arranged with the drilling hole.

[0057] The measuring rope 2 is inserted into the positioning hole 11 so as to be coaxially arranged with the drilling hole. The lower end of the measuring rope 2 has a door-shaped adapter 21, and the opening of the adapter 21 faces downward when the measuring rope 2 is in a vertical state; and the adapter 21 has a connecting rod 22 arranged perpendicularly to the measuring rope 2, so that the connecting rod 22 is in a horizontal state when the measuring rope 2 is in a vertical state.

[0058] It should be noted that in the present embodiment, the connecting rod 22 is arranged on the inner side of the adapter 21, and both ends of the connecting rod 22 are connected with the adapter 21.

[0059] The measuring needle 3 is arranged at the lower end of the measuring rope 2, and the measuring needle 3 can be inserted into the inside of the sediment along with the lowering of the measuring rope 2 when it is in a vertical state. In the present embodiment, the measuring needle 3 has a strip-shaped hole 31 penetrating through the radial direction thereof and extending along the length thereof; based on this, the aforementioned connecting rod 22 is inserted into the strip-shaped hole 31, so that the measuring needle 3 can be rotated to a horizontal state or a vertical state with the connecting rod 22 as the axis, and the measuring needle 3 in a horizontal state can move along the axial direction thereof.

[0060] It should be noted that, as shown in Figure 4 , a rubber pad capable of being elastically deformed is fixedly connected to the inner top surface of the adapter 21; when the measuring needle 3 swings to a vertical state, the main body of the measuring needle 3 will fall to one end of the strip-shaped hole 31 and contact the connecting rod 22 due to the influence of its own gravity; in this state, the upper end of the measuring needle 3 abuts against the rubber pad and causes the rubber pad to be deformed correspondingly, so as to avoid the measuring needle 3 from shaking during the process of being inserted into the sediment.

[0061] The measuring cake 4 is arranged at the lower side of the support arm 1, has an idle state fixed on the support arm 1, and a use state connected to the lower end of the measuring rope 2. The measuring cake 4 is provided with a positioning hole 41 penetrating in the up-down direction and suitable for the measuring rope 2 to pass through, and when the measuring cake 4 is in the idle state, the positioning hole 41 is coaxially communicated with the positioning hole 11. In addition, the surface of the measuring cake 4 is also provided with a receiving groove 42 communicated with the positioning hole 41 and suitable for the measuring needle 3 in the horizontal state to be embedded. When the measuring cake 4 is in the idle state, the positioning hole 41 is at the lower side of the measuring cake 4, so that the opening of the positioning hole 41 is arranged downward.

[0062] The measuring cake 4 and the support arm 1 have an anti-disengagement structure 5. In actual use, the anti-disengagement structure 5 is used to connect the measuring cake 4 and the support arm 1, so that the measuring cake 4 is fixed at the lower side of the support arm 1, and the positioning hole 41 and the positioning hole 11 are coaxially arranged, thereby on the one hand, the measuring rope 2 can pass through the positioning hole 11 and the positioning hole 41 in sequence and keep the vertical state, and on the other hand, the lowering step of the measuring rope 2 is avoided to be intervened.

[0063] In the embodiment of the present application, by lowering the measuring rope 2, the measuring needle 3 is inserted into the inside of the sediment and contacts the hole bottom, so that the measurement of the hole bottom depth is completed. Based on this, when the measuring rope 2 is pulled up to the drilling opening, the measuring needle 3 is rotated to the horizontal state by taking the connecting rod 22 as the shaft, so that the measuring needle 3 is embedded into the receiving groove 42, and then the anti-disengagement structure 5 is released and the measuring rope 2 is lowered until the measuring cake 4 contacts the top surface of the sediment, so that the measurement of the top surface depth of the sediment is completed.

[0064] In the above process, the operation of replacing the measuring needle 3 with the measuring cake 4 only needs two steps (i.e. rotating the measuring needle 3 and releasing the anti-disengagement structure 5), without the need of disassembling the measuring needle 3 and repeatedly positioning the measuring rope 2, so that the efficiency and accuracy of the hole bottom sediment thickness measurement can be improved.

[0065] Compared with the prior art, the hole bottom sediment thickness measurement device provided by the embodiment can quickly replace the measuring needle 3 and the measuring cake 4 at the measurement point position, and ensure the stability of the hole bottom sediment thickness measurement operation efficiency.

[0066] In some embodiments, as shown in Figure 1 and Figure 2 The two ends of the support arm 1 are fixedly connected with mounting seats 12 for supporting on the ground, and each mounting seat 12 is provided with a limiting member 6 for abutting against the inner wall of the drilling hole to limit the movement of the mounting seat 12 away from the drilling hole.

[0067] In some embodiments, as shown in Figures 6 to 8 The limiting member 6 includes a lifting plate 61 and a rotating roller 62.

[0068] The lifting plate 61 is arranged on the side of the mounting base 12 facing the drill hole, and is slidably connected with the mounting base 12 in the up-down direction. In actual use, the lifting plate 61 and the mounting base 12 have a distance adjusting structure 7 for adjusting the height of the lifting plate 61 and fixing the position of the lifting plate 61.

[0069] The rotating roller 62 is slidably arranged on the lower side of the lifting plate 61, and is adapted to move towards or away from the mounting base 12; and the rotating roller 62 and the lifting plate 61 have a locking structure 8 for limiting the movement of the rotating roller 62 relative to the lifting plate 61.

[0070] In actual use, the rotating roller 62 can be inserted into the drill hole by moving the lifting plate 61 downward, and the rotating roller 62 can abut against the inner wall of the drill hole by moving the rotating roller 62 towards the mounting base 12.

[0071] In some embodiments, as shown in Figures 6 to 8 The distance adjusting structure 7 includes a fixing nut 71 and an adjusting screw 72.

[0072] The fixing nut 71 is fixedly arranged on the mounting base 12, and the axis thereof is parallel to the up-down direction.

[0073] The adjusting screw 72 is threadedly connected to the fixing nut 71, and the lower end of the adjusting screw 72 has a protruding portion 721 extending radially outward for supporting the lifting plate 61 (to limit the downward movement of the lifting plate 61).

[0074] In some embodiments, as shown in Figure 7 The lifting plate 61 has a reserved hole 611 extending in the up-down direction, and the adjusting screw 72 is inserted into the reserved hole 611 to achieve hidden installation of the adjusting screw 72, and the protruding portion 721 abuts against the lower side of the lifting plate 61.

[0075] In some embodiments, as shown in Figure 8 The locking structure 8 includes a guide hole 81 and a connecting bolt 82.

[0076] The guide hole 81 is formed in the lifting plate 61 and extends in the up-down direction, and the guide hole 81 extends towards the mounting base 12.

[0077] The connecting bolt 82 is fixedly connected to the upper end of the rotating roller 62, and the connecting bolt 82 is inserted into the guide hole 81 from bottom to top to achieve the sliding connection of the rotating roller 62 and the lifting plate 61, and is adapted to move the rotating roller 62 towards or away from the mounting base 12.

[0078] After assembly, the upper end of the connecting bolt 82 extends to the upper side of the lifting plate 61; the extending part of the connecting bolt 82 is threadedly connected with an anti-skid nut 821, which is used to abut against the upper side of the lifting plate 61 to limit the sliding of the rotating roller 62 relative to the lifting plate 61.

[0079] In some embodiments, as shown in Figure 10 The anti-disengagement structure 5 includes a slot 51 and a sliding block 52.

[0080] The slot 51 is formed on the outer peripheral wall of the measuring cake 4; when the measuring cake 4 is fixed to the support arm 1 through the anti-disengagement structure 5, the axial direction of the slot 51 is parallel to the length direction of the support arm 1.

[0081] The sliding block 52 is slidingly connected to the lower side of the support arm 1, and the sliding direction thereof is parallel to the length direction of the support arm 1; based on this, the sliding block 52 has a plug rod 521 extending toward the measuring cake 4 and adapted to be inserted into the slot 51.

[0082] In actual use, by inserting the plug rod 521 into the slot 51, the downward movement of the measuring cake 4 relative to the support arm 1 can be limited.

[0083] It needs to be supplemented that in the embodiment, the anti-disengagement structure 5 has two groups and is symmetrically arranged on both sides of the measuring cake 4 along the length direction of the support arm 1.

[0084] In some embodiments, as shown in Figure 10 The side of the sliding block 52 away from the measuring cake 4 has a protruding block 13 connected with the support arm 1, and the protruding block 13 and the sliding block 52 have a spring 14 therebetween.

[0085] In actual use, the two ends of the spring 14 are respectively connected with the protruding block 13 and the sliding block 52; when the plug rod 521 exits the slot 51, the spring 14 is in an elastic compression state to drive the sliding block 52 to move away from the protruding block 13.

[0086] In some embodiments, as shown in Figure 10 The sliding block 52 has an anti-bending rod 522 extending toward the protruding block 13; in actual assembly, the anti-bending rod 522 is inserted into the spring 14 and in sliding connection with the protruding block 13, so as to on the one hand prevent the spring 14 from being bent and deformed along the radial direction thereof, and on the other hand further limit the sliding direction of the sliding block 52.

[0087] In some embodiments, as shown in Figure 9 The positioning hole 11 has an annular filler 9 therein, which wraps around the outer periphery of the measuring rope 2 to fill the gap between the measuring rope 2 and the inner wall of the positioning hole 11, so as to prevent the measuring rope 2 from shaking on the inner side of the positioning hole 11.

[0088] The above merely provides preferred embodiments of the present application, and is not used to limit the present application. Any modification, equivalent replacement, and improvement made in the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A hole bottom sediment thickness measuring device, characterized by, The utility model relates to a kind of measuring device for the depth of drill hole, including: Supporting arm, for fixing above drill hole, and its upper side is provided with the positioning hole for being coaxially arranged with the drill hole along up-down direction; Measuring rope, inserted into the positioning hole, so that it is coaxially arranged with the drill hole;The lower end of the measuring rope has a door-shaped adapter, and the adapter has a connecting rod arranged perpendicular to the measuring rope; Measuring needle, arranged at the lower end of the measuring rope, for inserting into the sediment;The measuring needle has a strip hole extending along its length, and the connecting rod is inserted into the strip hole, so that the measuring needle can be rotated to horizontal state or vertical state with the connecting rod as the shaft;And Measuring cake, arranged on the lower side of the supporting arm, and the upper side of the measuring cake is provided with a positioning hole penetrating along up-down direction, suitable for the measuring rope;And, the lower side of the measuring cake is provided with a receiving groove communicated with the positioning hole, suitable for embedding the measuring needle in horizontal state; Wherein, the measuring cake and the supporting arm have anti-disengagement structure;The anti-disengagement structure is used to connect the measuring cake and the supporting arm, so that the measuring cake is fixed on the lower side of the supporting arm, and the positioning hole and the positioning hole are coaxially arranged.

2. The under-reamer gauge of claim 1, wherein, Both ends of the supporting arm are fixedly connected with mounting seat for supporting on the ground, and each mounting seat has a limiting member for abutting against the inner wall of the drill hole to limit the movement of the mounting seat away from the drill hole.

3. The under-reamer gauge of claim 2, wherein, The limiting member includes: Lifting plate, arranged on the side of the mounting seat facing the drill hole, and slidingly connected with the mounting seat along up-down direction;The lifting plate and the mounting seat have distance adjusting structure for adjusting and fixing the lifting plate;And Rotating roller, slidingly arranged on the lower side of the lifting plate, suitable for moving towards or away from the mounting seat;And, the rotating roller and the lifting plate have locking structure to limit the movement of the rotating roller relative to the lifting plate; Wherein, by moving the lifting plate downward, the rotating roller can be inserted into the drill hole, and by moving the rotating roller towards the mounting seat, the rotating roller can abut against the inner wall of the drill hole.

4. The under-reamer gauge of claim 3, wherein, The distance adjusting structure includes: Fixed nut, fixedly arranged on the mounting seat, and its axial direction is parallel to the up-down direction;And Adjusting screw, threadedly connected on the fixed nut, and the lower end of the adjusting screw has a protrusion extending radially outward for supporting the lifting plate.

5. The under-reamer apparatus of claim 4, wherein the under-reamer apparatus further comprises a second sensor positioned on the second arm and configured to measure a second distance between the second arm and the second reference point. The lifting plate has a reserved hole penetrating along up-down direction, and the adjusting screw is inserted into the reserved hole, so that the protrusion abuts against the lower side of the lifting plate.

6. The under-reamer apparatus of claim 3, wherein, The locking structure includes: Guide hole, provided on the lifting plate, penetrating along up-down direction;And Connecting bolt, fixedly connected on the upper end of the rotating roller, and inserted into the guide hole, suitable for moving the rotating roller towards or away from the mounting seat;The upper end of the connecting bolt protrudes to the upper side of the lifting plate, and a non-slip nut is threadedly connected on the upper side of the lifting plate.

7. The under-reamer gauge apparatus of claim 1, wherein, The anti-disengagement structure includes: Slot, provided on the outer peripheral wall of the measuring cake;And A slider is slidingly connected to the lower side of the support arm and has a plug rod adapted to be inserted into the slot.

8. The under-reamer gauge apparatus of claim 7, wherein, The side of the slider opposite to the measuring tape has a protrusion connected to the support arm, and the protrusion and the slider have a spring therebetween. The two ends of the spring are connected to the protrusion and the slider, respectively; when the plug rod is withdrawn from the slot, the spring is in an elastic compression state to drive the slider to move away from the protrusion.

9. The under-reamer apparatus of claim 8, wherein, The slider has an anti-bending rod extending towards the protrusion, the anti-bending rod is inserted into the spring and is slidingly connected to the protrusion.

10. The under-reamer gauge apparatus of claim 1, wherein, The positioning hole has an annular filler therein, the filler surrounds the outer periphery of the measuring rope to fill the gap between the measuring rope and the inner wall of the positioning hole.

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