JPH0213957Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to an anchor installation tester, particularly an anchor installation tester used to check the pull-out strength of anchor bolts installed by the retrofit anchor method. be.

[Prior art] Instead of using a hydraulic gauge as a test device to check whether anchor bolts installed using the retrofitting anchor method can withstand the allowable load, a method of measuring electrical resistance using strain applied to a thin resistance wire has been used instead. One that uses a strain gauge that utilizes changes is widely known.

As shown in FIG. 4, this anchor construction tester is constructed by attaching a measuring ring 8a containing a strain gauge 7a to a peripheral wall 6a of a sleeve 5a disposed inside the protruding end 2a of an anchor bolt 1a installed on a reaction table 4a.
At the same time, a nut 10a is attached to the protruding end 9a of the anchor bolt 1a from the measuring ring 8a using a box wrench 11a.
At this time, the strain applied to the strain gauge 7a is electrically displayed to measure the pull-out strength of the installed anchor bolt 1a. This anchor bolt construction tester has many advantages such as being lightweight, easy to measure, and excellent in durability.

[Problem to be solved by the invention] However, the conventional anchor construction tester has the following problems:
A flat plate-shaped reaction force table 4a is installed on the construction surface 3a, and if the construction surface 3a is smooth, accurate measurement is possible, but if the construction surface 3a is rough, the reaction force table 4a is installed. It is difficult to make accurate measurements because it cannot be installed on the construction surface 3a so that the central axis of the anchor bolt 1a is perpendicular to the central axis of the anchor bolt 1a, as shown in Fig. 5. There was a problem that measurement could not be performed when the construction was performed in an inclined state with respect to the construction surface 3a.

The present invention was developed in consideration of the actual situation, and it is possible to accurately measure the pull-out strength even when the construction surface is rough and the anchor bolt is installed at an angle to the construction surface. The purpose of the present invention is to provide an anchor bolt construction tester that can perform the following tests.

[Means for Solving the Problems] The present invention includes mounting a measuring ring containing a strain gauge on the circumferential wall of the protruding end of the installed anchor bolt via a reaction force table installed on the construction surface, and In an anchor construction tester that measures the pull-out strength of the anchor bolt by screwing a nut onto the end of the anchor bolt protruding from the measuring ring and measuring the strain applied to the strain gauge, the reaction force table is centered. A plate-shaped base having an insertion hole for the anchor bolt, and removable protrusions on the surface of the base at positions equidistant from each other around the insertion hole, the length of which can be finely adjusted by a screw mechanism. In order to solve the above problem, the present invention has a structure consisting of at least three legs.

[Operation] When the construction surface is rough, the length of each leg of the reaction force table is adjusted by a screw mechanism, and the reaction force table is installed perpendicular to the central axis of the anchor bolt. Also,
If the anchor bolt is installed at an angle to the construction surface, select appropriate lengths for each leg and attach them to the base so that the reaction force base can be aligned with the center axis of the anchor bolt. Install at right angles.

[Example] Figures 1 and 2 show an example of the present invention used when the protruding end 31 of the installed anchor bolt 3 is short, and a strain gauge 11 is mainly housed inside. Measure the electrical resistance of the measuring ring 1, the reaction force table 2, the tension bolt 4 connected to the protruding end 31 of the installed anchor bolt 3, the screw nut 5 screwed onto the tip 41 of this tension bolt 4, and the strain gauge 11. and a measuring section 6.

The measuring ring 1 has a sleeve 13 in the center thereof, in which an insertion hole 12 for the tension bolt 4 is vertically formed. The sleeve 13 has a flange 14 larger than the nut 5 at its upper end, and a strain gauge 11 is housed in the circumferential wall 15. Further, the base end surface of the peripheral wall 15 is supported by a pressure support link 17 placed on a pedestal 16 via a spherical abutment surface.

The reaction force stand 2 includes a disk-shaped stand part 21 having an insertion hole 23 for a tension bolt 4 connected to an anchor bolt 3 in the center, and three legs protruding from one surface 24 of this stand part 21. It consists of part 22. These leg portions 22 can be removed by fitting convex portions 26 provided at their base ends into recesses 25 formed on the surface 24 of the base portion 21 at equal positions and equally spaced positions around the insertion hole 23. It is considered possible. Further, each leg 22 is provided with a screw mechanism 27 at its tip for finely adjusting its length. In addition, the legs 22 are made up of three legs of the same length,
Furthermore, it is preferable to prepare a plurality of sets having leg portions 22 of different lengths.

The measuring section 6 is entirely box-shaped and connected to the strain gauge 11 by a cord 61, and has a digital display section 62, a power switch 63, an indicator light 64, a zero adjustment switch 65, a battery checker 66, An inspection load setting dial 67 and a buzzer 68 that sounds when the inspection load is exceeded are arranged.

In the drawings, reference numeral 43 is a connecting nut for connecting the anchor bolt 3 and tension bolt 4, and reference numeral 69 is a measurement value unit changeover switch arranged on the surface of the measuring section 6.

To use such an embodiment, first, the construction surface 7
The tension bolt 4 is connected to the protruding end 31 of the anchor bolt 3 which has been installed using a connecting nut 43. Then, as shown in Fig. 1, the anchor bolt 3
If the construction is performed almost at right angles to the construction surface 7, the legs 2 of the same length are placed in each recess 25 of the base 21.
The reaction force table 2 with the fitting and protruding parts 2 is inserted through the insertion hole 23 into the tension bolt 4 and placed on the construction surface 7. Next, the measurement ring 1 is inserted through the insertion hole 12 into the tension bolt 4 and placed over the reaction force table 2. And measuring ring 1 of tension bolt 4
The nut 5 is screwed onto the tip 41 which is the protruding end from the. At this time, if the construction surface 7 is smooth, the reaction force table 2 can be placed at right angles to the central axis of the anchor bolt 3, that is, parallel to the construction surface 7, but if the construction surface 7 is rough In some cases, the reaction force table 2 is arranged parallel to the construction surface 7 by finely adjusting the length of each leg 22 by operating the screw mechanism 27 provided at the tip of each leg 22.

Next, the power switch 63 of the measuring section 6 is operated to operate the measuring section 6, the zero point is adjusted using the zero adjustment switch 65, and the test load value is set using the setting dial 67. Then, the nut 5 is tightened using, for example, a box wrench 8. Then, Natsuto 5
By tightening, a pullout load is applied to the anchor bolt 3 via the tension bolt 4. At the same time, a reaction force acts on the strain gauge 11 via the sleeve 13, and this reaction force is sent to the measurement section 6 as a change in electrical resistance value and displayed on the display section 62, so that the value becomes the test load value. By reading it, it is confirmed that the anchor bolt 3 has a predetermined pulling strength. In particular, in this embodiment, the buzzer 68 is set in advance to operate when the test load value is reached, so there is no need to constantly watch the display 62. Breaking of the bolt 4 can be prevented.

Figure 2 shows the tester shown in the above embodiment on the construction surface 7.
This shows an example of use in the case where the anchor bolt 3 is installed in an inclined state.The overall method of use is the same as that shown in Fig. By using legs 22 of different lengths, the reaction force table 2 can be placed perpendicular to the central axis of the anchor bolt 3, that is, parallel to the construction surface 7, thereby making it possible to measure.

In addition, in the embodiment, the protruding end 31 from the construction surface 7
Although the case where the anchor bolt 3 is used in a relatively short state is shown, if the protruding end 31 from the construction surface 7 of the installed anchor bolt 3 is sufficiently long, the anchor bolt 3 can be used without using the tension bolt 4. The nut 5 may be screwed directly onto the protruding end of the measuring ring 1 of 3. Further, in the embodiment described above, the reaction force table 2 has three legs 22, but it may have more legs.

[Effects of the invention] According to the invention having the above configuration, even if the construction surface is not smooth but rough, the length of each leg itself can be adjusted by operating the screw mechanism provided at the tip of the reaction table. By finely adjusting the angle, the reaction force table can be placed perpendicular to the center axis of the installed anchor bolt, allowing for accurate measurements. If the reaction force table is placed perpendicular to the center axis of the installed anchor bolt, measurements can be made very easily by using appropriate lengths for each leg of the reaction force table. It is something that can be done.

[Brief explanation of the drawing]

1 and 3 show an embodiment of the present invention, and FIG. 1 is a front view showing the state of use;
Figure 2 is a bottom view of the reaction table, Figure 3 is a front view showing usage conditions in different usage examples, Figure 4 is a front view showing usage conditions in a conventional example, and Figure 5 is an example of anchor bolt construction. FIG. 1... Measuring ring, 2... Reaction force table, 3... Anchor bolt, 5... Nut, 7... Construction surface, 11
... Strain gauge, 15 ... Circumferential wall, 21 ... Base part, 22 ... Leg part, 23 ... Insertion hole, 27 ... Screw mechanism, 31 ... Projection end.

Claims (1)

[Scope of utility model registration request] A measuring ring containing a strain gauge is attached to the circumferential wall of the protruding end of the anchor bolt through a reaction table installed on the construction surface, and a nut is attached to the protruding end of the anchor bolt from the measuring ring. In an anchor construction tester that measures the pull-out strength of the anchor bolt by screwing it in and measuring the strain applied to the strain gauge, the reaction force table is a plate-shaped platform having an insertion hole for the anchor bolt in the center. and at least three legs removably protruding from the surface of the base part at equal intervals from each other around the insertion hole, the length of which can be finely adjusted by a screw mechanism. Anchor construction tester.