JP2024004112A - Bolt inclination inspection device - Google Patents

Abstract

To be possible to accurately and easily confirm that an inclination of a placed bolt is within an allowable range regardless of a condition of a placed surface of the bolt.SOLUTION: A bolt inclination inspection device 10 includes an annular body 11 in which a contact surface 13 is positioned to mimic a placed surface 52 of a bolt 61 and a projection portion 14 that projects in a reverse direction to the contact surface 13 of the annular body 11. The inclination surface 13 that inclines outward to a projection direction of the projection portion 14 from an edge of a center hole 12 of the annular body 11 is formed on the projection portion 14, and an inclination angle of the inclination surface 13 is set at an allowable inclination angle of the bolt 61.SELECTED DRAWING: Figure 1

Description

The present invention relates to a bolt inclination inspection device used for inspecting the inclination of bolts cast into earth, concrete, etc.

BACKGROUND ART Conventionally, at civil engineering and construction sites, the axial force in the axial direction of a bolt that has been driven has been measured using a load meter, an axial force meter, etc., as disclosed in Patent Document 1. When measuring this axial force, for example, as shown in FIG. A load cell 105 is extrapolated to the bolt 102 by placing it between the two. Then, the nut 106 screwed onto the bolt 102 on the outside of the washer 104 is tightened, and the strain caused by screwing the nut 106 is measured with a load meter 105 between the washer 103 and the washer 104. Obtain the axial force of 102.

JP 2021-75903 Publication

By the way, when measuring the axial force of the bolt 102 driven into the earth 101, if the bolt 102 is installed in the earth 101 with an excessive inclination, the axial force cannot be measured accurately (Fig. 3 (see (b)). Therefore, as shown in FIG. 4, by applying an L-shaped curved scale 107, which is a general tool, to the part of the bolt 102 that protrudes from the ground 101, the inclination of the driven bolt 102 is within the permissible range. I am checking whether If the driving surface on which the bolt 102 is driven is a vertical or horizontal surface, it is possible to confirm the inclination with a certain degree of accuracy using the curved scale 107.

However, when the inner peripheral surface or slope of the tunnel is the driving surface of the bolt 102, the driving surface becomes a curved surface or an inclined surface. In this case, the device must be placed in an inclined position, or it may easily be placed in an inclined position. If the L-shaped curved length 107 cannot be arranged horizontally and at right angles to the driving surface, for example, even if the bolt axis X1 is tilted with respect to the bolt axis X or the driving surface as it should be, It is mistakenly assumed to be perpendicular to the pouring surface. Therefore, there is a need for an instrument that can accurately confirm that the inclination of the bolt 102 that has been driven is within an allowable range, regardless of the condition of the surface on which the bolt 102 is driven.

The present invention is proposed in view of the above-mentioned problems, and is a bolt that can accurately and easily confirm that the inclination of a bolt that has been driven is within an allowable range, regardless of the condition of the bolt driving surface. The purpose of this invention is to provide a tilt inspection device.

The bolt inclination inspection instrument of the present invention includes an annular body having a contact surface arranged to follow the driving surface of the bolt, and a protrusion projecting in a direction opposite to the contact surface of the annular body, An inclined surface is formed on the protrusion that slopes outward from the edge of the center hole of the annular body toward the direction in which the protrusion protrudes, and the inclination angle of the inclined surface is set to an allowable inclination angle for the inclination of the bolt. It is characterized by the presence of
According to this, since the contact surface of the annular body is arranged to follow the driving surface of the bolt, it is possible to accurately confirm the inclination of the axis of the driven bolt. Additionally, the inclination of the bolt axis can be easily checked by simply extrapolating the center hole of the annular body to the driven bolt and arranging the contact surface of the annular body to follow the bolt driving surface. . In other words, regardless of the condition of the bolt driving surface, the contact surface of the annular body makes surface contact with the bolt driving surface, so that it is possible to accurately and accurately confirm that the inclination of the driven bolt is within the allowable range. It can be easily checked.

The bolt inclination inspection instrument of the present invention is characterized in that the protrusion is formed in a cylindrical shape that stands up from the periphery of the center hole, and the inclined surface is provided on the inner peripheral surface of the cylindrical protrusion. do.
According to this, by simply extrapolating the center hole of the annular body to the driven bolt and arranging the contact surface of the annular body to follow the driving surface of the bolt, the entire circumference of the driven bolt can be covered. It is possible to check whether the inclination of the bolt is within the permissible range by checking the inclination of the bolt, and it is possible to efficiently check the inclination of the bolt over the entire circumference.

The bolt inclination inspection instrument of the present invention is characterized in that the protrusion is formed in a plate shape extending in the radial direction of the annular body, and the inclined surface is provided on the center hole side of the plate-shaped protrusion. shall be.
According to this, in addition to being able to confirm that the inclination of the bolt that has been driven is within the permissible range, it is also possible to easily check the details of the inclination angle of the bolt from right next to the bolt that has been driven. It is possible to improve the visibility of the inclined state of the bolt.

According to the bolt inclination inspection instrument of the present invention, it is possible to accurately and easily confirm that the inclination of a driven bolt is within an allowable range, regardless of the condition of the bolt driving surface.

(a) is a perspective view of a bolt inclination inspection instrument according to a first embodiment of the present invention, and (b) is an explanatory cross-sectional view of the device in use. (a) is a perspective view of a bolt inclination inspection instrument according to a second embodiment of the present invention, and (b) is an explanatory cross-sectional view of the device in use. (a) is a cross-sectional explanatory diagram illustrating conventional bolt axial force measurement, and (b) is a cross-sectional explanatory diagram illustrating a state where the bolt is excessively tilted in conventional bolt axial force measurement. FIG. 3 is a perspective explanatory diagram illustrating a conventional method of confirming the inclination of a driven bolt using a curved scale.

[Bolt inclination inspection device of the first embodiment]
As shown in FIG. 1, a bolt inclination inspection instrument 10 according to a first embodiment of the present invention includes a flange-like annular body 11 and a cylindrical shape that is formed to stand up from the periphery of a center hole 12 of the annular body 11. The protrusion 14 is provided. The annular body 11 is different from the bolt 61, which is a rock bolt that is partially buried in the ground 51 and is driven so that the remaining part protrudes from the driving surface 52 to the outside of the ground 51. A contact surface 13 is placed over the protruding portion and arranged to follow the driving surface 52 of the bolt 61 . The contact surface 13 is flat and flush as a whole, and comes into surface contact with the driving surface 52 when the driving surface 52 is flat.

The cylindrical protrusion 14 is provided so as to protrude in the opposite direction to the contact surface 13 of the annular body 11 . Further, the protrusion 14 is formed with an inclined surface 15 that slopes outward from the edge of the center hole 12 of the annular body 11 toward the protrusion direction of the protrusion 14. In the first embodiment, the cylindrical protrusion A tapered inclined surface 15 is circumferentially provided on the inner peripheral surface of the portion 14. Furthermore, in the first embodiment, the peripheral surface of the center hole 12 is also an inclined surface having the same inclination angle as the inclined surface 15, and is formed continuously with the inclined surface 15 of the protrusion 14.

The angle of inclination of the inclined surface 15 of the protrusion 14 and the inclined surface of the circumferential surface of the center hole 12 that is continuous therewith with respect to the normal line of the contact surface 13 is set to an allowable inclination angle of the inclination of the bolt 61. In the first embodiment, the inclination angle of the inclined surface 15 of the protrusion 14 and the inclined surface of the peripheral surface of the center hole 12 that is continuous with the inclined surface 15 is set to an allowable inclination angle of the inclination of the bolt 61 over the entire circumference. .

When using the bolt inclination inspection instrument 10 of the first embodiment, before measuring the axial force of the bolt 61 that has been driven, the annular body 11 and the protrusion 14 of the bolt inclination inspection instrument 10 are removed from the protrusion of the bolt 61. The contact surface 13 is placed so as to follow the driving surface 52 of the bolt 61. If it is confirmed that the bolt 61 is not pressed against the inclined surface 15, which is the inner circumferential surface of the protrusion 14, it can be seen that the inclination of the driven bolt 61 is within the allowable inclination angle.

According to the bolt inclination inspection instrument 10 of the first embodiment, since the contact surface 13 of the annular body 11 is arranged to follow the driving surface 52 of the bolt 61, the inclination of the axis of the bolt 61 that has been driven can be checked. You can check it accurately. In addition, by simply extrapolating the center hole 12 of the annular body 11 onto the driven bolt 61 and arranging the contact surface 13 of the annular body 11 so as to follow the driving surface 52 of the bolt 61, the bolt axis can be easily aligned. You can check the slope. That is, regardless of the state of the driving surface 52 of the bolt 61, the contact surface 13 of the annular body 11 is in surface contact with the driving surface 52 of the bolt 61, so that the inclination of the driven bolt 61 is within the permissible range. It is possible to accurately and easily confirm that the Furthermore, by simply arranging it in this way, it is possible to check whether the inclination of the bolt 61 is within the permissible range over the entire circumference of the bolt 61 that has been driven, and the inclination of the bolt 61 can be confirmed over the entire circumference. can be done efficiently.

[Second embodiment of bolt inclination inspection device]
As shown in FIG. 2, the bolt inclination inspection instrument 20 according to the second embodiment of the present invention includes an annular body 21 that is a plate-shaped ring, and a protrusion that is formed in a plate shape that extends in the radial direction of the annular body 21. 24. In the illustrated example, the lower part of the protrusion 24 on the annular body 21 side is formed to have the same length as the radius of the annular body 21, and the lower inner end of the protrusion 24 forms part of the periphery of the center hole 22. There is.

The annular body 21 is different from the bolt 61 which is a rock bolt that is partially buried in the earth 51 and is driven such that the remaining part protrudes from the driving surface 52 to the outside of the earth 51. A contact surface 23 is placed over the protruding portion and arranged to follow the driving surface 52 of the bolt 61 . The contact surface 23 is flat and flush as a whole, and comes into surface contact with the driving surface 52 when the driving surface 52 is flat.

The plate-shaped protrusion 24 is provided so as to protrude in the opposite direction to the contact surface 23 of the annular body 21 . Further, the protrusion 24 is formed with an inclined surface 25 that slopes outward from the edge of the center hole 22 of the annular body 21 in the direction in which the protrusion 24 protrudes. A slope-shaped inclined surface 25 is provided on the central hole 22 side of the portion 24. Furthermore, in the second embodiment, the circumferential surface of the center hole 22 at a position corresponding to the protrusion 24 is an inclined surface having the same inclination angle as the inclined surface 25. It is formed continuously.

The angle of inclination of the sloped surface 25 of the protrusion 24 and the part of the circumferential surface of the center hole 22 that is continuous with the sloped surface with respect to the normal line of the contact surface 23 is equal to the allowable inclination of the bolt 61. It is set at an angle.

When using the bolt inclination inspection instrument 20 of the second embodiment, before measuring the axial force of the bolt 61 that has been driven, the annular body 21 of the bolt inclination inspection instrument 10 is extrapolated onto the protruding portion of the bolt 61, and the bolt 61 is The contact surface 23 is arranged so as to follow the pouring surface 52 of. If it is confirmed that the bolt 61 is not pressed against the inner inclined surface 15 of the protrusion 24, it can be seen that the inclination of the driven bolt 61 is within the allowable inclination angle. Furthermore, the bolt inclination inspection tool 20 is sequentially rotated in the circumferential direction of the annular body 21, and if it is confirmed that the bolt 61 is not pressed against the inner slope 15 of the protrusion 24 over the entire circumference, the driving is completed. It can be seen that the inclination of the bolt 61 is within the allowable inclination angle over the entire circumference.

According to the bolt inclination inspection instrument 20 of the second embodiment, since the contact surface 23 of the annular body 21 is arranged to follow the driving surface 52 of the bolt 61, the inclination of the axis of the bolt 61 that has been driven can be checked. You can check it accurately. In addition, by simply extrapolating the center hole 22 of the annular body 21 onto the driven bolt 61 and arranging the contact surface 23 of the annular body 21 so as to follow the driving surface 52 of the bolt 61, the bolt axis can be easily aligned. You can check the slope. That is, regardless of the state of the driving surface 52 of the bolt 61, the contact surface 23 of the annular body 21 is in surface contact with the driving surface 52 of the bolt 61, so that the inclination of the driven bolt 61 is within the allowable range. It is possible to accurately and easily confirm that the Furthermore, the details of the inclination angle of the bolt 61 can be easily confirmed from directly beside the bolt 61 that has been driven, and the visibility of the inclination state of the bolt 61 can be improved.

[Scope of coverage of the invention disclosed herein]
In addition to each invention and each embodiment listed as an invention, the invention disclosed in this specification is specified by changing the partial contents of these to other contents disclosed in this specification to the extent applicable. , or specified by adding other contents disclosed in this specification to these contents, or specified by deleting these partial contents to the extent that partial effects can be obtained and converting them into a general concept. includes. The invention disclosed in this specification also includes the following contents and modifications.

For example, in the above embodiment, the bolt 61 is driven into the ground 51 of a tunnel etc., and the bolt inclination inspection instruments 10 and 20 are used to check the inclination of the bolt 61. It is also suitable to use the bolt inclination inspection instruments 10 and 20 to check the inclination of bolts that have been installed, and it is also possible to use the bolt inclination inspection instruments 10 and 20 to confirm the inclination of bolts other than rock bolts. . Furthermore, the bolt inclination inspection instrument of the present invention can be used for appropriate bolts driven in the civil engineering and construction fields.

Further, the plate-shaped protrusions 24 in the bolt inclination inspection instrument 20 of the second embodiment can be provided at multiple locations in the circumferential direction of the annular body 21 at intervals. By providing the plate-shaped protrusions 24 at separate locations, the inclination of the bolt 61 can be inspected in multiple directions corresponding to multiple locations. When the plate-shaped protrusions 24 are provided at multiple locations in the circumferential direction of the annular body 21, they may be provided over the entire circumference of the annular body 21, or only in a local fan-shaped area in the circumferential direction of the annular body 21. It is possible to set it as the structure where it is provided.

INDUSTRIAL APPLICATION This invention can be utilized, for example when inspecting the inclination of the rock bolt or anchor bolt cast into the ground or concrete.

DESCRIPTION OF SYMBOLS 10, 20... Bolt inclination inspection instrument 11, 21... Annular body 12, 22... Center hole 13, 23... Contact surface 14, 24... Projection part 15, 25... Inclined surface 51... Earth 52... Casting surface 61... Bolt 101... Earth 102... Bolt 103, 104... Washer 105... Load cell 106... Nut 107... Curved length X... Original bolt axis X1... Bolt axis

Claims (3)

an annular body whose contact surface is arranged to follow the driving surface of the bolt;
a protrusion protruding in a direction opposite to the contact surface of the annular body;
The protruding portion is formed with an inclined surface that slopes outward from the edge of the center hole of the annular body toward the protruding direction of the protruding portion;
A bolt inclination inspection instrument characterized in that the inclination angle of the inclined surface is set to a permissible inclination angle of the inclination of the bolt. The protrusion is formed into a cylindrical shape that stands up from the periphery of the center hole,
The bolt inclination inspection instrument according to claim 1, wherein the inclined surface is provided on the inner peripheral surface of the cylindrical protrusion. The protruding portion is formed in a plate shape extending in the radial direction of the annular body,
The bolt inclination inspection instrument according to claim 1, wherein the inclined surface is provided on the center hole side of the plate-shaped protrusion.

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