Wall hole plugging thickness detection device
By designing a device for wall hole sealing thickness detection, the use of adjustable measuring parts to detect the sealing thickness and wall thickness, the problem of complex operation in the prior art and inability to detect the wall thickness simultaneously is solved, and fast and accurate detection is achieved, which is suitable for on-site construction.
Patent Information
- Application Number
- CN202422225663.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-11
- Publication Date
- 2025-06-24
- Estimated Expiration
- 2034-09-11
AI Technical Summary
When detecting the thickness of wall hole sealing, the prior art is complicated to operate and is inconvenient for on-site construction. It is also impossible to detect the thickness of the wall at the same time, and the applicability is limited.
A wall hole sealing thickness detection device is designed. By setting perforations on the wall and using an adjustable measuring piece, the measuring piece has a first position and a second position, which is used to detect the sealing thickness and the wall thickness respectively, and the device operates simple and fast.
It realizes rapid and accurate detection of wall hole sealing thickness and wall thickness, simplifies the operation process, is suitable for on-site construction, and expands the versatility of the detection device.
Smart Images
Figure CN223021152U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of building construction, and particularly relates to a detection device for the thickness of wall hole plugging. Background Art
[0002] During the building construction process, formworks, scaffolds or decorative materials are firmly fixed to the outer wall of a building through screws. These screws will leave holes on the outer wall during the fixing process. To prevent moisture from seeping into the wall through the holes, ensure the heat preservation performance of the building and ensure the aesthetics of the building, the holes on the outer wall are now mostly plugged with cement mortar after the construction of the outer wall is completed.
[0003] After plugging the holes on the outer wall with the existing technology, the staff will detect parameters such as the diameter and depth of the plugged holes by visual observation or using instruments to ensure the plugging effect of the holes. However, the results of visual observation are less accurate and cannot guarantee the reliability of the detection results. Moreover, when using instruments such as ultrasonic detectors and thickness gauges to detect the density and thickness of the plugging material, the operation process of the instruments is complex, which increases the detection time and cost and is not conducive to use during on-site construction. In addition, the existing detection devices cannot detect the thickness of the building outer wall while detecting the thickness of the wall hole plugging, and the applicability is general.
[0004] Therefore, there is an urgent need for a detection device for the thickness of wall hole plugging to solve the above problems. Summary of the Utility Model
[0005] Aiming at the deficiencies of the existing technology, the purpose of the utility model is to provide a detection device for the thickness of wall hole plugging, which can detect the plugging thickness of the wall hole and the thickness of the wall, and the detection process is simple and fast, which is convenient for on-site construction use.
[0006] To achieve this purpose, the utility model adopts the following technical solutions:
[0007] A detection device for the thickness of wall hole plugging is provided. A perforation penetrating along the thickness direction of the wall is provided on the wall. The first end of the perforation is filled with a plugging member, and the plugging member can plug the perforation. The detection device for the thickness of wall hole plugging includes a measuring member that can extend into the perforation through the second end of the perforation. The measuring member extends along the extending direction of the perforation, and the length of the measuring member extending into the perforation is adjustable. The measuring member has a first position and a second position. In the first position, the measuring member abuts against the plugging member. In the second position, the measuring member passes through the plugging member and the first end of the perforation. A scale portion is provided on the measuring member. When the measuring member is in different positions, the first end and the second end of the perforation can indicate different scale values on the scale portion.
[0008] Optionally, the wall hole plugging thickness detection device further includes a limiting member disposed on the measuring member. The limiting member is located at an end of the measuring member away from the perforation. In the second position, the limiting member can contact the wall to limit the measuring member in the second position.
[0009] Optionally, the wall hole plugging thickness detection device further includes an adjusting member and a fastening member. A screw portion is provided on the measuring member, and a connection hole is provided on the limiting member. The screw portion passes through the connection hole, and both the fastening member and the adjusting member are in threaded cooperation with the screw portion and are respectively disposed on both sides of the limiting member. The fastening member and the adjusting member can cooperate to fix the limiting member to the screw portion.
[0010] Optionally, a screw portion is provided on the measuring member, and a threaded hole is provided on the limiting member. The screw portion passes through the threaded hole and is in threaded cooperation with the threaded hole.
[0011] Optionally, a first buffer pad is provided on a side of the limiting member facing the wall. The first buffer pad is made of a flexible material.
[0012] Optionally, the scale portion extends from an end of the measuring member in contact with the plugging member to the limiting member. The scale portion includes a first scale segment and a second scale segment that are spaced apart along the circumferential direction of the measuring member. The scale values on the first scale segment increase from the end of the measuring member in contact with the plugging member to the end of the measuring member connected to the limiting member, and the scale values on the second scale segment decrease from the end of the measuring member in contact with the plugging member to the end of the measuring member connected to the limiting member.
[0013] Optionally, the wall hole plugging thickness detection device further includes a holding member disposed on the measuring member. The holding member is located at an end of the measuring member away from the perforation and is used to drive the measuring member to move.
[0014] Optionally, a plurality of holding members are provided, and the plurality of holding members are spaced apart along the extending direction of the measuring member.
[0015] Optionally, the wall hole plugging thickness detection device further includes an anti-slip sleeve, and the anti-slip sleeve is sleeved outside the holding member.
[0016] Optionally, a second buffer pad is provided at an end of the measuring member extending into the perforation. The second buffer pad is made of a flexible material.
[0017] Compared with the prior art, the beneficial effects of the present utility model are:
[0018] The utility model provides a detection device for the plugging thickness of a wall hole. The measuring member extends into the through hole through the second end of the through hole, and the length of the measuring member extending into the through hole is adjusted to move the measuring member to the first position, where the measuring member abuts against the plugging member. At this time, the length of the measuring member extending into the through hole can be obtained by reading the scale value indicated at the first end of the through hole; when the measuring member moves to the second position, the measuring member passes through the plugging member and the first end of the through hole. At this time, the thickness of the wall can be obtained by reading the scale values at the first end and the second end of the through hole. The staff can obtain the plugging thickness of the plugging member based on the length of the measuring member extending into the through hole at the first position and the thickness of the wall, so as to detect the plugging thickness of the hole, and the detection process is simple and fast, which is convenient for on-site construction use. In addition, the detection device for the plugging thickness of the wall hole provided by the utility model can also detect the thickness of the wall while detecting the plugging thickness of the hole, which expands the versatility of the detection device for the plugging thickness of the wall hole. Description of the Drawings
[0019] Figure 1 It is a schematic structural diagram of the detection device for the plugging thickness of the wall hole provided by the utility model;
[0020] Figure 2 It is a schematic diagram when the measuring member of the detection device for the plugging thickness of the wall hole provided by the utility model is in the first position;
[0021] Figure 3 It is a schematic diagram when the measuring member of the detection device for the plugging thickness of the wall hole provided by the utility model is in the second position.
[0022] Wherein:
[0023] 100, wall; 101, through hole; 200, plugging member;
[0024] 1, measuring member; 11, first scale section; 12, second scale section;
[0025] 2, limiting member;
[0026] 3, holding member. Detailed Embodiments
[0027] It should be understood that in the description of the present utility model, the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.
[0028] It should be noted that in the description of the present utility model, unless otherwise clearly defined and limited, the terms "set", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood through specific situations.
[0029] The technical solution of the present utility model will be further described below with reference to the accompanying drawings and through specific embodiments.
[0030] As Figures 1 to 3 shown, this embodiment provides a device for detecting the plugging thickness of a wall hole, which can detect the plugging thickness of the hole in the wall 100 and the thickness of the wall 100, and the detection process is simple and fast, facilitating on-site construction use.
[0031] Referring to Figure 1 、 Figure 2 and Figure 3 , a perforation 101 penetrating along the thickness direction of the wall 100 is provided on the wall 100. The first end of the perforation 101 is filled with a plugging member 200, and the plugging member 200 can plug the perforation 101. The device for detecting the plugging thickness of the wall hole includes a measuring member 1 that can extend into the perforation 101 through the second end of the perforation 101. The measuring member 1 extends along the extending direction of the perforation 101, and the length of the measuring member 1 extending into the perforation 101 is adjustable. The measuring member 1 has a first position and a second position. In the first position, the measuring member 1 abuts against the plugging member 200. In the second position, the measuring member 1 passes through the plugging member 200 and the first end of the perforation 101. A scale portion is provided on the measuring member 1. When the measuring member 1 is in different positions, the first end and the second end of the perforation 101 can indicate different scale values on the scale portion.
[0032] The wall hole plugging thickness detection device provided in this embodiment has a measuring member 1 extending into the perforation 101 through the second end of the perforation 101. The length of the measuring member 1 extending into the perforation 101 is adjusted to move the measuring member 1 to the first position, where the measuring member 1 abuts against the plugging member 200. At this time, the length of the measuring member 1 extending into the perforation 101 can be obtained by reading the scale value indicated at the first end of the perforation 101; when the measuring member 1 moves to the second position, the measuring member 1 passes through the plugging member 200 and the first end of the perforation 101. At this time, the thickness of the wall 100 can be obtained by reading the scale values at the first end and the second end of the perforation 101. The staff can obtain the thickness of the plugging by the plugging member 200 based on the length of the measuring member 1 extending into the perforation 101 at the first position and the thickness of the wall 100, so as to detect the plugging thickness of the hole, and the detection process is simple and fast, facilitating on-site construction use. In addition, the wall hole plugging thickness detection device provided by the present utility model can also detect the thickness of the wall 100 while detecting the plugging thickness of the hole, expanding the versatility of the wall hole plugging thickness detection device.
[0033] Specifically, the first end of the perforation 101 communicates with the outside of the wall 100, and the second end of the perforation 101 communicates with the inside of the wall 100. The measuring member 1 extends into the perforation 101 from the inside of the wall 100. After the measuring member 1 moves to the first position, the staff reads the first scale value H1 indicated at the second end of the perforation 101, that is, the inner wall of the wall 100. By adding the first scale value H1 to the distance from the end of the scale portion to the end where the measuring member 1 abuts against the plugging member 200, the length L of the measuring member 1 extending into the perforation 101 can be obtained; after the measuring member 1 moves to the second position, the staff reads the second scale value H2 indicated at the second end of the perforation 101, that is, the inner wall of the wall 100, and the third scale value H3 indicated at the first end of the perforation 101, that is, the outer wall of the wall 100. Subsequently, by calculating the difference between the third scale value H3 and the second scale value H2, the thickness T of the wall 100 can be obtained. By calculating the difference between the thickness T of the wall 100 and the length L of the measuring member 1 extending into the perforation 101, the thickness of the plugging by the plugging member 200 can be obtained. The obtained plugging thickness is one of the parameters for evaluating the plugging performance of the hole in the wall 100.
[0034] Exemplarily, the measuring member 1 is selected as a solid bar, such as square steel or round steel, and the cross-sectional dimension of the measuring member 1 is smaller than the cross-sectional dimension of the perforation 101 to ensure that the measuring member 1 can extend into the perforation 101. In this embodiment, the measuring member 1 is selected as an A12 solid round steel pipe.
[0035] In this embodiment, the plugging member 200 is formed of cement mortar, and its shape is determined according to the size of the perforation 101.
[0036] In some embodiments, a plurality of perforations 101 are provided on the wall 100. While detecting the plugging thickness of each perforation 101, a plurality of thickness values of the wall 100 can also be obtained. By comparing the plurality of thickness values, it is possible to detect whether there is a deviation in the thickness of the wall 100, which expands the versatility of the detection device.
[0037] Optionally, referring to Figure 1 , the wall hole plugging thickness detection device further includes a limiting member 2 provided on the measuring member 1. The limiting member 2 is located at one end of the measuring member 1 away from the perforation 101. In the second position, the limiting member 2 can contact the wall 100 to limit the measuring member 1 in the second position. With this setting, no matter whether the measuring member 1 is in the first position or the second position, when the staff reads the scale values indicated by the first end and the second end of the perforation 101, the measuring member 1 can remain stationary, ensuring the accuracy of the reading.
[0038] Furthermore, the cross-sectional dimension of the limiting member 2 is larger than the cross-sectional dimension of the perforation 101, that is, the limiting member 2 cannot enter the perforation 101 to ensure that the limiting member 2 can limit the measuring member 1 in the second position. Specifically, in the first position, the measuring member 1 can abut against the plugging member 200, and the plugging member 200 enables the measuring member 1 to move only in the direction from the first end to the second end of the perforation 101 ( Figure 2 in the positive X direction in Figure 2 ), and cannot move in the direction from the second end to the first end of the perforation 101 (
[0039] in the negative X direction in
[0040] ), thereby limiting the measuring member 1 in the first position; in the second position, the limiting member 2 contacts the wall 100, making the measuring member 1 can only move in the direction from the first end to the second end of the perforation 101 and cannot move in the direction from the second end to the first end of the perforation 101, thereby limiting the measuring member 1 in the second position.
[0041] Exemplarily, the limiting member 2 is a limiting plate or a limiting rod, and both the fastening member and the adjusting member are nuts.
[0042] Further, the cross-sectional dimension of the fastener is smaller than that of the through hole 101, so that when in the second position, the fastener can enter the through hole 101 to prevent the fastener from affecting the contact between the limiting member 2 and the wall body 100.
[0043] In another alternative embodiment, a screw part is provided on the measuring member 1, and a threaded hole is provided on the limiting member 2. The screw part passes through the threaded hole and is in threaded cooperation with the threaded hole to fix the limiting member 2 to the screw part. Moreover, the threaded connection enables the position of the limiting member 2 on the screw part to be adjusted to adapt to different thicknesses of the wall body 100.
[0044] Optionally, a first buffer pad is provided on the side of the limiting member 2 facing the wall body 100. The first buffer pad is made of a flexible material and can reduce the mutual acting force between the limiting member 2 and the wall body 100 when they are in contact, so as to prevent hard contact between the limiting member 2 and the wall body 100, reduce the wear between the limiting member 2 and the wall body 100, and extend the service life.
[0045] Exemplarily, the flexible material is rubber or silica gel, etc., which has good buffering effect and long service life.
[0046] Optionally, referring to Figure 2 , the scale part extends from the end of the measuring member 1 in contact with the plugging member 200 to the limiting member 2. The scale part includes a first scale segment 11 and a second scale segment 12 arranged at intervals along the circumferential direction of the measuring member 1. The scale values on the first scale segment 11 increase from the end of the measuring member 1 in contact with the plugging member 200 to the end of the measuring member 1 connected to the limiting member 2, and the scale values on the second scale segment 12 decrease from the end of the measuring member 1 in contact with the plugging member 200 to the end of the measuring member 1 connected to the limiting member 2. With such a setting, the staff can quickly obtain the length L of the measuring member 1 extending into the through hole 101 through the first scale segment 11, and can quickly obtain the thickness T of the wall body 100 through the second scale segment 12, which is more convenient for the staff to use, improves the measuring speed and the adaptability of the detection device.
[0047] Referring to Figure 1, the thickness of the outer walls of common concrete buildings is mostly in the range of 180 mm to 300 mm. In this embodiment, the size of the first buffer pad itself can be ignored. The scale value of the first scale segment 11 at the end where the measuring member 1 abuts against the plugging member 200 is 0, and the scale value of the first scale segment 11 at the end where the measuring member 1 is connected to the limiting member 2 is 350. The scale value of the second scale segment 12 at the end where the measuring member 1 abuts against the plugging member 200 is 350, and the scale value of the second scale segment 12 at the end where the measuring member 1 is connected to the limiting member 2 is 0. In the first position, the staff can obtain the first scale value H1 by reading the scale value of the first scale segment 11 at the second end of the through hole 101. At this time, the first scale value H1 is the length L of the measuring member 1 extending into the through hole 101. In the second position, the staff can obtain the third scale value H3 by reading the scale value of the second scale segment 12 at the first end of the through hole 101, that is, the outer wall of the wall 100. At this time, the third scale value H3 is the thickness T of the wall 100. Therefore, the settings of the first scale segment 11 and the second scale segment 12 enable the staff to obtain the thickness of the plugging by the plugging member 200 by reading the scale only twice during the detection process, significantly improving the measurement speed.
[0048] Further, when considering the size of the first buffer pad itself, the scale value at the position where the second scale segment 12 intersects with the measuring member 1 on the side of the first buffer pad away from the limiting member 2 is set to 0.
[0049] In other embodiments, the scale ranges of the first scale segment 11 and the second scale segment 12 can also be in the range of 0 mm to 400 mm to detect the outer walls of other structures such as masonry.
[0050] Optionally, referring to Figure 3 , the device for detecting the plugging thickness of the wall hole further includes a holding member 3 provided on the measuring member 1. The holding member 3 is located at the end of the measuring member 1 away from the through hole 101 and is used to drive the measuring member 1 to move. During the detection process, the staff holds the holding member 3, and the staff applies a driving force to the holding member 3 to make the holding member 3 drive the measuring member 1 to move, which is more convenient for the staff to control the position of the measuring member 1 and improves the practicability of the detection device.
[0051] Exemplarily, the holding member 3 is a rod body, which is more convenient for the staff to hold.
[0052] Further, referring to Figure 2 , a plurality of holding members 3 are provided. The plurality of holding members 3 are arranged at intervals along the extending direction of the measuring member 1, which is more convenient for the staff to drive the measuring member 1 to move through the holding members 3. Moreover, because the length of the measuring member 1 is relatively long, the arrangement of the plurality of holding members 3 enables the staff to apply driving forces to different positions of the measuring member 1 when driving the measuring member 1 to move, thereby avoiding the measuring member 1 from being bent and ensuring the safety of the detection process.
[0053] In this embodiment, referring to Figure 2 , there are two holding members 3. When driving the measuring member 1 to move, the two hands of the staff respectively hold different holding members 3, which is convenient for the staff to apply force.
[0054] Optionally, the wall hole plugging thickness detection device further includes an anti-slip sleeve sleeved outside the holding member 3. The anti-slip sleeve can increase the friction between the staff's palm and the holding member 3, prevent the holding member 3 from slipping off the staff's palm when the staff applies force, improve the use feeling of the staff, and ensure the safety of the staff during the detection process.
[0055] Exemplarily, the anti-slip sleeve is made of materials such as rubber or silica gel, and has good elasticity, wear resistance and anti-slip performance.
[0056] Optionally, a second buffer pad is provided at the end of the measuring member 1 extending into the through hole 101. The second buffer pad is made of a flexible material, which can reduce the mutual acting force between the measuring member 1 and the plugging member 200 when the measuring member 1 contacts the plugging member 200, so as to prevent hard contact between the measuring member 1 and the plugging member 200, reduce the wear of the measuring member 1 and the plugging member 200, and extend the service life.
[0057] Exemplarily, the flexible material is rubber or silica gel, etc., which has good buffering effect and long service life.
[0058] Further, when the scale value at the end where the first scale segment 11 abuts against the plugging member 200 on the measuring member 1 is 0, if the thickness of the second buffer pad can be ignored, the staff can directly obtain the length L of the measuring member 1 extending into the through hole 101 by reading the scale value of the first scale segment 11 at the second end of the through hole 101; if the thickness of the second buffer pad needs to be considered, the length L of the measuring member 1 extending into the through hole 101 is obtained by adding the first scale value H1 and the thickness of the second buffer pad.
[0059] Using the wall hole plugging thickness detection device provided in this embodiment to detect the hole plugging thickness mainly includes the following steps:
[0060] Hold the holding member 3 and drive the measuring member 1 to extend into the through hole 101. After the measuring member 1 abuts against the plugging member 200, read the first scale value H1 of the first scale segment 11 indicated at the second end of the through hole 101; then, continue to drive the measuring member 1 to move towards the first end of the through hole 101 through the holding member 3. After the limiting member 2 contacts the inner wall of the wall 100, read the third scale value H3 of the second scale segment 12 indicated at the first end of the through hole 101, that is, the outer wall of the wall 100; finally, the thickness of the plugging member 200 can be obtained by calculating the difference between the third scale value H3 and the first scale value H1.
[0061] During the above detection process, after the measured part 1 moves to the second position, the width of the plugging member 200 can also be measured, and the obtained width of the plugging member 200 is another parameter for evaluating the hole plugging performance of the wall 100.
[0062] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed by the present invention fall within the protection scope and the disclosure scope of the present invention.
Claims
1. A wall hole plugging thickness detection device, wherein a wall (100) is provided with a through hole (101) penetrating along the thickness direction thereof, a first end of the through hole (101) is filled with a plugging member (200), and the plugging member (200) can plug the through hole (101), characterized in that: The wall hole sealing thickness detection device comprises a measuring piece (1) capable of extending into the through-hole (101) via the second end of the through-hole (101); the measuring piece (1) extends along the extension direction of the through-hole (101); and the length of the measuring piece (1) extending into the through-hole (101) is adjustable; the measuring piece (1) has a first position and a second position; in the first position, the measuring piece (1) abuts against the sealing piece (200); in the second position, the measuring piece (1) passes through the sealing piece (200) and the first end of the through-hole (101); a scale portion is provided on the measuring piece (1); when the measuring piece (1) is in different positions, the first end and the second end of the through-hole (101) can indicate different scale values on the scale portion.
2. The wall hole sealing thickness detection device according to claim 1, characterized in that: The wall hole sealing thickness detection device further comprises a limiting member (2) arranged on the measuring member (1), wherein the limiting member (2) is located at an end of the measuring member (1) away from the through hole (101), and when in the second position, the limiting member (2) can contact the wall (100) to limit the measuring member (1) to the second position.
3. The wall hole sealing thickness detection device according to claim 2, characterized in that: The wall hole sealing thickness detection device also includes an adjusting member and a fastener. The measuring member (1) is provided with a screw portion, the limiting member (2) is provided with a connecting hole, the screw portion is passed through the connecting hole, the fastener and the adjusting member are both threadedly matched with the screw portion and are respectively arranged on both sides of the limiting member (2). The fastener and the adjusting member cooperate to fix the limiting member (2) to the screw portion.
4. The wall hole sealing thickness detection device according to claim 2, characterized in that: The measuring member (1) is provided with a screw rod portion, the limiting member (2) is provided with a threaded hole, the screw rod portion passes through the threaded hole and is threadably matched with the threaded hole.
5. The wall hole sealing thickness detection device according to claim 2, characterized in that: A first buffer pad is arranged on the side of the limiting member (2) facing the wall (100), and the first buffer pad is made of a flexible material.
6. The wall hole sealing thickness detection device according to claim 2, characterized in that: The scale portion extends from the end portion where the measuring piece (1) and the blocking piece (200) abut against each other to the position limiting piece (2), and the scale portion comprises a first scale segment (11) and a second scale segment (12) which are arranged at intervals along the circumference of the measuring piece (1), the scale values on the first scale segment (11) showing an increasing trend from the end where the measuring piece (1) and the blocking piece (200) abut against each other to the end where the measuring piece (1) and the blocking piece (200) are connected, and the scale values on the second scale segment (12) showing a decreasing trend from the end where the measuring piece (1) and the blocking piece (200) abut against each other to the end where the measuring piece (1) and the blocking piece (2) are connected.
7. The wall hole sealing thickness detection device according to claim 1, characterized in that: The wall hole sealing thickness detection device further comprises a holding member (3) arranged on the measuring member (1); the holding member (3) is located at an end of the measuring member (1) away from the through hole (101) and is used to drive the measuring member (1) to move.
8. The wall hole sealing thickness detection device according to claim 7, characterized in that: A plurality of the holding members (3) are provided, and the plurality of the holding members (3) are arranged at intervals along the extension direction of the measuring member (1).
9. The wall hole sealing thickness detection device according to claim 7, characterized in that: The wall hole blocking thickness detection device also includes an anti-slip sleeve, which is arranged outside the holding member (3).
10. The wall hole sealing thickness detection device according to any one of claims 1 to 9, characterized in that: A second buffer pad is provided at one end of the measuring piece (1) extending into the through hole (101), and the second buffer pad is made of a flexible material.