JP2005283194A - Inclination anchor hole inclination discriminating jig - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an anchor hole inclination discriminating jig, capable of discriminating whether the inclination of the anchor hole arranged on the installation surface is being within allowable range. <P>SOLUTION: THe shaft part 12 to be inserted into the anchor hole 3 bored on the structure 1 for the insert 2, and the holder part 14 holding the shaft part 12 along the anchor hole 3, while parallel abutting on the installation surface are connected freely rotatably through a spherical bearing. The scale means 16, indicating an allowable inclination value of the anchor hole 3, is provided in the holder part 14 internally facing to the other end of the shaft 12. The inclination of the anchor hole 3 is discriminated by inserting the shaft part 12 into the anchor hole 3, and reading the inclination of the shaft part 12. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an anchor hole inclination determination jig, and more particularly to an anchor hole inclination determination jig that easily determines the inclination of an anchor hole installed in a structure.

  Anchor structures are often embedded in concrete structures such as buildings, floor foundations, and bridge girders for the purpose of attaching parts, fixing installations, and fastening anchor bolts to prevent overturning. For the same reason, tapping is also performed on a steel structure. As a typical example of a structure having such anchor holes, a monorail track girder will be described below.

  Monorail track girders are mainly made of steel (RC) girders that are sturdy and can have a long column span, and concrete (PC) girders that are inexpensive and have high production efficiency. The track girder itself acts as a monorail rail. The track girder is provided with a trolley wire for supplying high-voltage electricity as a power source for the monorail and an insulator for insulating and supporting the wire from the track girder. Furthermore, radio equipment necessary for the operation of the monorail and electric wire racks for laying signals and power supply wiring are attached to the track girders.

  In order to attach these incidental facilities to the girder track, a bag-like anchor hole called an insert is embedded in the PC girder, and a tapped hole is formed in the RC girder. The burial operation of the insert in the PC girder is arranged at a predetermined position on the inner wall surface of a mold-shaped molding machine into which concrete is poured using a reinforcing bar or a wire. After that, the concrete is poured and, when solidified, is fixed and held by the concrete. In the process of pouring concrete, a vibrating rod called a vibrator is inserted to give vibration to the concrete. Thereby, the fluidity | liquidity of concrete is improved and the bubble which exists in concrete inside is removed. In some cases, the vibrator is accidentally applied to the insert that has been temporarily placed at the stage of this work, or the insert is fixed in an inclined state due to vibration. In addition, in the RC girder, the operator may accidentally insert a drill in tapping a hole, resulting in a tilted anchor hole.

  If an anchor hole inclined with respect to the track girder is constructed, the bolt head and the washer seating surface do not sufficiently come into contact with the attachment when fastening the bolt, so that the necessary frictional force cannot be obtained and it is easily loosened. Further, if it is tightened forcibly, deformation or breakage of the bolt is caused, which is not preferable in construction. In this example, in order to obtain a prescribed screw fastening torque, the inclination of the anchor hole must be set within 5 °.

  Therefore, in order to prevent this from occurring at the stage of component installation, immediately after manufacturing the track girder, check whether the mounting position of the insert and screw hole and the inclination of the anchor hole center axis are within the allowable range. It is carried out. At this time, if necessary, correction work is performed immediately.

  As shown in FIG. 3 (1), the operation of determining whether the anchor hole is inclined is performed by inserting about half of the bolt 4 into the anchor hole 3 of the insert 2 installed in the concrete structure 1, and The protractor 5 reads the inclination of the central axis of the bolt 4 in the uninserted portion. Further, as shown in FIG. 3 (2), a commercially available angle meter 6 is applied to the upper surface of the bolt 4 head, and the angular difference of the central axis of the bolt 4 with respect to the mounting surface is read and measured. In the method of reading with the protractor 5, if the anchor hole has a thread before it is discriminated, the bolt must be screwed. Further, in order to determine in which direction in which the insert 2 is inclined, the protractor must be checked by turning it at least half a turn, making the determination work difficult.

Further, as a method for simplifying such work, as shown in FIG. 3 (3), a straight portion of the angle ruler 7 called a protractor is cut to about the anchor hole depth and inserted into the anchor hole 3. A method of measuring an angle is performed. Further, a screw hole shape or a tapped hole is inspected by a measuring device as shown in Patent Document 1 and Patent Document 2.
Japanese Patent Laid-Open No. 2001-82952 Japanese Patent Laid-Open No. 2003-248813

However, in the above-described method for determining the inclination of the anchor hole using the angle ruler, an accurate measurement value cannot be obtained unless the side of the inserted ruler is in contact with the inner wall of the anchor hole without a gap. In addition, since the PC girder insert is resinous, when a steel angle ruler is inserted into the anchor hole and measured, if the anchor hole is threaded, the thread may be damaged. there were. Furthermore, in order to confirm in which direction the anchor hole is inclined, the inclination angle cannot be confirmed unless it is rotated at least half a turn with respect to the mounting surface of the anchor hole as described above, and the work is difficult. It was an operation with errors depending on the level of proficiency of the workers. Further, the operation devices shown in Patent Document 1 and Patent Document 2 are large-scale devices, and the devices themselves are expensive. Therefore, it is not suitable for the operation of easily discriminating the inclination degree at the anchor hole installation site.
Therefore, in order to solve the above-described problems of the prior art, an object of the present invention is to provide a jig that can easily determine whether or not an inclination of an anchor hole installed on a mounting surface is within an allowable range.

In order to achieve the above object, an anchor hole inclination determination jig according to the present invention is installed so as to be rotatable through a shaft part that can be inserted into an anchor hole installed in a structure, and the shaft part and spherical bearing means. It is characterized by comprising a holder part for holding this, and scale means for displaying an allowable range of an inclination angle indicated by the shaft part on the holder part.
In this case, the scale means may display a scale corresponding to the inclination angle.

  The anchor hole inclination determination jig according to the present invention is a scale in which a shaft having a diameter slightly smaller than the anchor hole diameter is inserted into the anchor hole, and a scale or a reference line is written at a position parallel to the surface to which the anchor hole is attached. The means is installed in the holder portion, and the scale indicated by the shaft is read to determine whether or not the inclination of the shaft indicates an allowable range.

  As a result, the shaft direction of the anchor hole is simply inserted into the anchor hole and fixed to the mounting surface, and the tilt direction and angle of the anchor hole, and whether or not the tilt is within an allowable range, are instantly determined. It becomes possible.

  Embodiments of an anchor hole inclination discrimination jig according to the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a diagram showing a schematic configuration of an anchor hole inclination discrimination jig according to this embodiment. FIG. 1A is a cross-sectional side view of the anchor hole inclination determination jig. FIG. 1 (2) shows an AA arrow diagram in (1). FIG. 1 (3) shows a BB arrow diagram in (1). FIG. 2 is an explanatory view showing a method of determining the anchor hole inclination according to the present embodiment.

  As shown in FIG. 1, the anchor hole inclination determination jig 10 is connected to a shaft portion 12 inserted into an anchor hole 3 of an insert 2 installed in a concrete structure 1 and the shaft portion 12 so as to be rotatable. The shaft portion 12 is fixedly held along the anchor hole 3 and is in contact with the other end portion of the shaft portion 12 on the side surface of the holder portion 14 and in contact with the mounting surface of the anchor hole 3 in parallel. The scale means 16 displays the allowable tilt value of the anchor hole.

  The shaft portion 12 has an end portion slightly smaller in diameter than the diameter of the anchor hole 3 and has an anchor hole insertion portion 18 that can be inserted into the anchor hole 3. Further, the other end portion of the shaft portion 12 is formed with a needle-shaped pointer portion 20 that is thinner than the anchor hole insertion portion 18 and has a tip end portion. The shaft portion 12 is rotatably connected to the holder portion 14 by connecting means. In the present embodiment, description will be made using spherical bearing means as the connecting means. In the central part of the shaft part 12, a holder part 14 and a rotatable spherical part 22 are formed. The shaft portion 12 is preferably made of, for example, resin or the like so that the screw thread is not damaged when inserted into the anchor hole 3.

  The holder portion 14 is formed in a cylindrical shape including the above-described pointer portion 20 and is connected to the shaft portion 12 via a bearing portion 24 formed at one end portion. The bearing portion 24 is rotatable with the spherical portion 22 formed on the shaft portion 12. As shown in FIG. 1 (2), the shaft centers of the shaft portion 12 and the holder portion 14 are formed coaxially. A pressing leg 26 is formed on the side surface of the one end portion of the holder portion 14. A plurality of pressing legs 26 are formed on the same plane perpendicular to the central axis of the shaft portion 12. Accordingly, the pressing leg 26 can fix the side surface of the holder portion 14 in parallel with the mounting surface of the anchor hole 3.

  A transparent plate 28 serving as the scale means 16 is fixed to the side surface of the other end portion of the holder portion 14 by a presser lid 30. The transparent plate 28 is formed of a transparent and disk shape such as an acrylic plate so that the pointer portion 20 inside the holder portion 14 can be visually observed. As shown in FIG. 1 (3), the center of the transparent plate 28 and the axial center of the holder portion 14 are formed coaxially. Further, on the outer surface of the transparent plate 28, a reference circle 32 representing a tilt allowable range of the anchor hole is displayed on a concentric circle with the center. The reference circle 32 may be a circle that serves as a reference pointed by the pointer portion 20 when the anchor hole center axis is inclined at 5 °, which is an allowable range of the anchor hole construction standard, for example.

  The anchor hole inclination discriminating jig 10 having the above configuration acts as described below. The anchor hole insertion portion 18 of the anchor hole inclination determination jig 10 is inserted along the inner wall of the anchor hole 3 of the insert 2 installed in a concrete structure or the like. Next, the pressing leg 26 of the determination jig 10 is brought into contact with the mounting surface of the insert 2. When the anchor hole 3 is inclined as shown by the dotted line in FIG. 1, the pivotally formed anchor hole insertion portion 18 is inclined following the inclined inner wall of the anchor hole 3. Furthermore, the determination jig 10 can be fixed to the mounting surface of the anchor hole 3 while maintaining the inclination of the shaft portion 12 by contacting the pressing leg 26 to the mounting surface. The transparent plate 28 formed at the other end together with the determination jig 10 can be fixed in parallel with the mounting surface.

  Next, on the surface of the transparent plate 28, a reference circle 32 to which the tip of the pointer portion 20 is pointed when the central axis is inclined within the allowable range of inclination of the anchor hole 3 is displayed. Therefore, by reading the position where the distal end of the pointer portion 20 points to the transparent plate 28, it is possible to instantaneously determine whether or not the inclination of the anchor hole 3 is within the allowable range. The transparent plate 28 can measure the inclination angle by drawing a scale corresponding to the inclination angle of the shaft portion 12.

  In addition, it is desirable that the spherical bearing portion formed between the shaft portion 12 and the holder portion 14 has a certain appropriate frictional resistance so as not to be inclined due to a gap between the anchor hole 3 and the anchor hole insertion portion 18. . Further, in this embodiment, the description has been made using the rotatable spherical bearing means. However, the rotation is not limited to this as long as the rotation is possible. For example, the shaft is fixed so as to be centered by the pressing force of the spring member. The shaft can also be formed so as to be able to swing along the wall surface of the anchor hole when the anchor hole is inserted. Moreover, although this embodiment demonstrated the insert which does not have threading in an anchor hole, it cannot be overemphasized that it is applicable even when it has a screw hole in an insert.

  Thus, the anchor hole inclination determination jig according to the present invention inserts the shaft into the anchor hole and reads the position of the scale plate indicated by the shaft end, so that the inclination of the anchor hole is within an allowable range. Or the inclination direction can be easily determined. Therefore, the burden of the anchor hole inclination inspection and measurement at the construction site can be greatly reduced.

It is a figure which shows the structure outline of the anchor hole inclination discrimination jig which concerns on this embodiment. It is explanatory drawing which shows anchor hole inclination discrimination | determination based on this embodiment. It is explanatory drawing which shows the measuring method of the conventional anchor hole inclination.

Explanation of symbols

1 ......... Concrete structure, 2 ......... Insert, 3 ......... Anchor hole, 4 ......... Bolt, 5 ...... Protractor, 6 ...... Angle meter, 7 ......... Angle ruler, 10 ... ... Anchor hole inclination determination jig, 12 ......... Shaft part, 14 ......... Holder part, 16 ......... Scale means, 18 ......... Anchor hole insertion part, 20 ......... Pointer part, 22 ......... Spherical surface , 24... Bearing portion, 26... Pressing leg, 28... Transparent plate, 30.

Claims (2)

  A shaft part that can be inserted into an anchor hole installed in the structure, a holder part that is rotatably installed via the shaft part and spherical bearing means, and an inclination angle indicated by the shaft part to the holder part An anchor hole inclination discriminating jig comprising a scale means for displaying a permissible range. 2. The anchor hole inclination discrimination jig according to claim 1, wherein the scale means displays a scale corresponding to an inclination angle.

Images