JP5370789B2 - Tensile testing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a very simple tension testing machine that eliminates the need for fastening work and removing work of a nut to solve the problem in which work of fastening and removing the nut to and from a bolt is complicated and inefficient, in a method proposed to perform a strength test for the bolt fixed to a structure by welding with all screw bolts and embedding with anchor bolts, for installing heavy goods and pipelines in the structure, in which a hexagon nut is attached to the provided bolt, and the nut is fastened by a torque wrench and tension strength is measured. <P>SOLUTION: In a tension testing machine, a holding stand 3 of a square cylinder provided with a through hole 4 through which a bolt can pass, in a top face and a bottom face is laterally arranged in a housing 2 of a pipe tower stand 1, a bolt is passed through the through hole 4 of the holding stand 3, an angle of inclination of the holding stand 3 is displaced by a cam shaft 7 to sandwich the bolt by edges of the through hole 4, and tension strength is measured by a value of a torque wrench when the displacement of the holding stand 3 applies torgue to a rotary shaft. <P>COPYRIGHT: (C)2013,JPO&amp;INPIT

Description

  The present invention relates to a tensile tester for measuring the fixing strength of all screw bolts fixed to a structure, and provides a tensile tester that can be easily, quickly and easily performed.

At construction sites, equipment installation sites, etc., for installation of heavy objects and pipes in the building, fixing the hanging suspension to the fixing bolts by means such as welding with all screw bolts or embedding with anchor bolts to the structure Then, a heavy object is hung with the suspended hanging tool, and the heavy object is arranged at a predetermined position.
In this case, for the purpose of ensuring safety and protecting structures and equipment, it is necessary to conduct a strength test of the fixing bolts and confirm in advance whether or not the strength can withstand the load of heavy objects to be suspended. is there.

Conventionally, as a method for performing a strength test of a fixing bolt at a facility installation work site or the like, a method using a torque wrench in addition to a hydraulic device has been proposed.
For example, on the foundation embedded with anchor bolts, a base that is formed in a U shape with an opening at the bottom is placed, and a nut is screwed into the threaded portion of the anchor bolt protruding from the hole in the base, and this nut is tightened to the specified torque Tighten with a torque wrench set to the value. This is a method of diagnosing the pullout strength of the anchor bolt from this tightening torque.

  In addition, this is a device for testing the fixing strength of the anchor bolt by rotating a torque wrench with a torque applied to the screw shaft screwed into the screw bearing via a swivel joint independent of the anchor bolt. This method makes it possible to accurately test the axial overload resistance without being affected by torsional loads.

  Japanese Patent Laid-Open No. 10-48112   JP 2004-93315 A

  All of the conventional methods and apparatuses described above require a nut to be screwed into the bolt, and the operation of attaching and removing the nut after the test is extremely inefficient and inefficient.

  The present invention is intended to solve the conventional problem of attaching and detaching nuts, and it is possible to easily and easily measure the fixing strength of a bolt fixed to a structure without using a nut. An object of the present invention is to provide a tensile tester capable of performing

  In order to achieve the above-described object, the present invention has a rectangular cylindrical body holding base disposed horizontally in a housing portion in a tube tower, and a bolt penetrates the top and bottom surfaces near the center of the holding base. A through hole is provided, and a fulcrum hole is provided on a side surface of one end of the clamping table and supported via a pin, and a cam shaft is disposed on an upper surface portion of the opposite end. A rotating lever and a torque wrench connecting portion are provided on the outer sides of the cylindrical tower base at both ends connected to the main shaft, respectively, and a cam shaft on the upper surface portion of the other end facing the spring and the bottom surface for preventing reverse rotation of the cam shaft This is to provide a tensile tester having a structure supported by a spring for pushing up the clamping table.

  Furthermore, another object of the present invention is to provide a tensile testing machine characterized in that through holes provided in the upper surface and the bottom surface of the clamping table are provided at positions that are displaced from the vertical axis.

  The operation of the above means for solving the problem is as follows. That is, the camshaft that is connected to the shaft of the rotation lever by directly inserting the cylindrical tower mount of the present invention into the bolt fixed to the structure and rotating the rotation lever lightly while pressing the mount against the structure surface. Is rotated to displace the inclination of the holding table provided in the housing portion, and the bolt is lightly held by the edge of the through hole in the upper surface and the bottom surface provided in the holding table. Next, the tension tester is capable of measuring the fixing strength of the bolt by setting the torque wrench in the torque wrench connecting portion, rotating the camshaft linked to the shaft, and reading the applied torque with the torque wrench. Furthermore, the through-hole formed in the clamping table is provided at a position where the axis is displaced from the vertical, so that the bolt can be held more securely.

  As described above, the tensile testing machine according to the present invention does not require troublesome work such as attaching and removing nuts. This is a tensile tester with a very simple means that the tensile strength of the fixing bolt can be measured by tightening. Then, the inclination of the clamping base is displaced by means of camshaft rotation, the bolt is clamped at the edge of the through hole provided in the clamping base, and the torque applied to the further displacement of the clamping base is tightened with the torque wrench. Thus, the fixing strength can be easily measured by reading the tensile strength of the bolt as a torque value.

  In particular, the present invention eliminates the complicated work of manually screwing and removing the nut from the tip of the bolt toward the structure for the embedded type bolt that cannot be removed. Therefore, it can be said that the fixing strength of the bolt can be measured easily, quickly and very easily.

The longitudinal cross-sectional view which showed each element of the tensile testing machine of this invention in the cross section. The perspective whole view of the tensile testing machine of this invention.

BEST MODE FOR CARRYING OUT THE INVENTION

Next, embodiments of the present invention will be described in detail with reference to the drawings.
1 to 2 show an embodiment of a tensile testing machine according to the present invention. Reference numeral 1 denotes a tube tower frame through which a bolt can pass, and a housing 2 in the tube tower frame 1 has a rectangular tube body. The holding table 3 is arranged horizontally. In the clamping table 3, through holes 4 through which bolts can pass are provided in the upper surface a and the bottom surface b near the center. And the fulcrum hole 5 is provided in the both sides | surfaces of the one end of this clamping base 3, and the one end is supported through the pin 6 of the axis | shaft. A camshaft 7 is arranged on the upper surface of the other end opposite to this, and a rotating lever 8 and a camshaft connecting portion 9 are arranged on the outer side of the column tower 1 at the shaft ends that are linked to the main shaft of the camshaft 7. It is provided. Further, at the other opposite end, it is supported by a spring 10 such as a push lot for preventing reverse rotation of the camshaft 7 disposed on the upper surface portion, and a spring 11 for pushing up the clamping table 3 from the bottom surface portion. It has a structured. Further, the bolt through holes 4 provided on the upper surface a and the bottom surface b of the clamping table 3 are provided at positions shifted from the vertical axis so that the bolts can be easily clamped at the edges of the through holes 4.

    Therefore, the present invention inserts the cylindrical tower mount 1 into the bolt with respect to the bolt fixed to the structure, and lightly turns the rotating lever 8 while pressing the mount 1 against the structure surface A, so that the shaft of the rotating lever 8 The camshaft 7 in the housing part 2 to be linked is rotated to displace the inclination of the clamping table 3 so that the bolt is clamped by the edge of the through hole 4 in the upper surface a and the bottom surface b provided on the clamping table 3. Next, the torque wrench is set in the torque wrench connecting portion 9, the camshaft 7 linked with the shaft is further rotated, and the applied torque is read with the torque wrench so that the fixing strength of the bolt can be measured. It is a tensile testing machine that the clamping of the bolt is released by returning it.

  Furthermore, by providing the through hole 4 provided in the holding table 3 at a position where the axis is displaced from the vertical, the bolt can be more securely held at the edge of the through hole 4. At this time, the fulcrum holes 5 provided on both side surfaces of the clamping table 3 are slightly larger than the pins 6 so that the movement of the clamping table 3 caused by the displacement of the inclination of the clamping table 3 is not hindered. Provided so that the fulcrum with the pin 6 can be moved.

  By the way, for the 200 mm long screw bolt embedded in the ceiling structure, insert the rotary lever of the tensile tester of the present invention into the screw bolt in the open position, and then turn the rotary lever to the fixed position to temporarily After stopping (both hands are released at this time), a display type torque wrench was set and tightened on the torque wrench connection, and the measured value of 150 kilograms was confirmed using the force with which the screw bolt is pulled as the torque value. Therefore, tightening of the torque wrench was stopped, the rotating lever was returned to the open position, and the tensile tester of the present invention was pulled out from the anchor bolt. The time required for this series of operations was approximately a few seconds with a set of tensile testers and several seconds with a measurement operation, and the bolt fixing strength could be measured quickly and easily.

DESCRIPTION OF SYMBOLS 1 ... Tube tower 2 ... Housing part 3 ... Holding stand a ... Upper surface b of a holding stand ... Lower surface 4 of a holding stand ... Through-hole 5 ... A fulcrum hole 6 .... Pin 7 ... Camshaft 8 ... Rotating lever 9 ... Torque wrench connection 10 ... Spring 11 ... Spring A ... Structure

Claims (2)

  A tensile testing machine for testing the strength against a bolt fixed to a structure, wherein a holding unit of a rectangular tube body is laterally arranged in a housing part in a tube tower frame, and the holding table is located near the center. A through-hole through which the bolt penetrates is provided on the top and bottom surfaces, a fulcrum hole is provided on the side surface of one end of the clamping base, and supported by a pin, and a camshaft is arranged on the top surface of the other end A rotating lever and a torque wrench connecting portion are provided on both ends of the camshaft connected to the main shaft on the outside of the cylindrical tower base, and the camshaft on the upper surface of the opposite end is connected to the camshaft of the camshaft. A tensile testing machine with a structure that is supported by a spring that prevents reverse rotation and a spring that pushes up the clamping table on the bottom.   2. The tensile testing machine according to claim 1, wherein the through holes formed in the upper surface and the bottom surface of the clamping table are provided at positions where the axes are displaced from the vertical.

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