Anchor bolt tensile testing machine

Abstract

To provide a tensile tester for an anchor bolt that can be transported easily and installed relatively easily, and simply tests fixing force by performing a tensile test by jack-up.SOLUTION: A tensile tester for an anchor bolt is composed of a combination of: a manual handle type mechanical cylinder (21), a straight displacement gauge (30), and a main body frame that penetrates through those on a hollow position frame table (10). At a lower part of the frame table, a cylinder lower part of the mechanical cylinder is caused to penetrate from a first attachment hole (102) in the center of the table and to protrude downward. On a tip side of that, a shaft extension socket, a plate base of a displacement plate, and a load cell are connected in order on one axis, and a displacement plate (43) is vertically sandwiched between a shaft extension socket (444) on an upper side and a load cell (40) on a lower side.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] This invention relates to a tensile testing machine for anchor bolts, which is used to test anchor bolts that are embedded and fixed in a base material such as concrete by post-installed anchors or when the base material is cast, and which is used to easily check the anchoring strength of the anchor bolts to be tested.In particular, this invention relates to a handy tensile testing machine that checks the anchoring strength of anchors by conducting a tensile test on anchor bolts that are fixed in an existing anchoring base material such as cast concrete by post-installed anchors. [Background technology]

[0002] Conventionally, desk anchors, steel pipe cotters, etc. have been used as anchor materials to be installed on the surface part or joint boundary (joint surface) of a base material structure (joint base material) in which anchor bars are embedded in a base material such as concrete.

[0003] Anchor bolts (anchors) fixed into an anchoring base material such as concrete must be periodically subjected to tensile tests after being fixed to confirm that they have a fixed force equal to or greater than a specified level. Examples of conventional tensile testing machines include those disclosed in JP 2003-139673 (Anchor Testing Device and Method) and JP 2001-050877 (Tool for Inspecting Anchor Bolt Tensile Strength in Earthquake-Resistant Reinforcement Work). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2004-139673 [Patent Document 2] Patent Publication No. 2001-050877 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in all of the above-mentioned conventional tensile testing machines, the test device is installed around the anchor bolt (anchor) via a stand or the like and jacked up, and the transportation and installation of the jacking power is time-consuming, making it impossible to perform a tensile test easily.

[0006] Therefore, an object of the present invention is to provide a handy anchor bolt tensile testing machine that is easy to transport, can be installed relatively easily, and can easily test anchorage strength by performing a manual tensile test without using any power such as a jack-up. [Means for solving the problem]

[0007] The anchor bolt tensile tester of the present invention employs the following features. Note that the numbers or alphabetical characters written following the component names are symbols for convenience in order to refer to the symbols in the drawings shown as examples, and do not limit the names or concepts of the components.

[0008] The anchor bolt tensile testing machine of the present invention has at least the following features [1] [2] [3].

[0009] [1] A hand-operated mechanical cylinder (21, 22, 23), A straight displacement meter (30), A tensile testing machine comprising: a main body stand (10) that is placed on a measurement surface on which anchor bolts are fixed, and that holds the mechanical cylinder and the straight displacement gauge in parallel with each other on a stand table (10) in a hollow position above the measurement surface; The lower part of the stand table (10) has a cylinder lower part (21) of a mechanical cylinder that penetrates through a first mounting hole (102) provided in the center of the table, and a measurement pin (31) of a straight displacement meter that penetrates through a second mounting hole (103) provided in the vicinity of the first mounting hole (102) and protrudes downward. At least an axial extension socket, a plate base of a displacement plate, and a load cell are connected in this order on a single axis at the bottom of the cylinder, and the displacement plate (43) is sandwiched between the upper axial extension socket (444) and the lower load cell (40). Furthermore, the load cell is connected so that a loading portion faces a fixing portion of the anchor bolt, and the loading portion is connected to the anchor bolt via a box-shaped coupler.

[0010] [2] 2. The anchor bolt tensile testing machine according to claim 1, wherein the main stand is composed of a rigid stand table (10) having a first central mounting hole and a second mounting hole nearby, and a plurality of leg bars (11A, 11B, 11C) provided on the symmetry axis of the stand table surface or at left-right symmetrical positions about the symmetry axis, with the axis passing through the centers of the first mounting hole and the second mounting hole as the symmetry axis, and the plurality of leg bars (11A, 11B, 11C) support the stand table and the equipment on the stand table in midair from left-right symmetrical support positions about the symmetry axis of the stand table.

[0011] [3] The mechanical cylinder is composed of a cylinder shaft 21 held in the vertical extension direction at the center position of the base table 10, a cylinder frame 22 cylindrically surrounding the upper periphery of the cylinder shaft 21 excluding the lower part of the cylinder and regulating the vertical axial movement of the cylinder, and a cylinder box 23 that is in gear contact with the side of the cylinder shaft 21 and converts the axis to a horizontal axis rod 230, 3. The anchor bolt tensile testing machine according to claim 1 or 2, wherein the cylinder box (23) is disposed symmetrically about the axis of symmetry of the stand table (10) in plan view, and horizontal shaft rods (230) perpendicular to the axis of symmetry protrude outward from the left and right sides of the cylinder box (23), and a rotation handle (24) can be connected and attached to at least one of the left and right horizontal shaft rods (230). [Effects of the Invention]

[0012] This tool allows accurate tensile testing to be easily performed by vertically pulling up anchor bolts (including those connected via post-installed anchors) that have been embedded and fixed in base materials such as concrete, and it also has a compact form and excellent operability thanks to the manual rotating handle.It can be used to test the anchor strength of ceilings, walls, etc. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a perspective view showing a configuration example of an anchor bolt tensile testing machine according to a first embodiment of the present invention. FIG. [Figure 2] FIG. 2 is an exploded perspective view showing the component configuration of the anchor bolt tensile testing machine of Example 1. [Figure 3] FIG. 2 is a side view of the anchor bolt tensile testing machine of Example 1 shown in FIG. 1. [Figure 4] FIG. 2 is a plan view of the anchor bolt tensile tester and head cover of the first embodiment shown in FIG. 1. [Figure 5] Cross section AA of Figure 3. [Figure 6] FIG. 2 is a perspective view showing an example of a state in which a head cover is attached to the anchor bolt tensile testing machine of Example 1. [Figure 7] FIG. 2 is a cross-sectional side view of a main part of the anchor bolt tensile testing machine of Example 1 with the head cover attached. [Figure 8] FIG. 4 is a side view of a tensile testing machine for anchor bolts according to a second embodiment of the present invention. [Figure 9] FIG. 10 is a cross-sectional side view of a main part of the anchor bolt tensile testing machine of Example 2. DETAILED DESCRIPTION OF THE INVENTION

[0014] Hereinafter, an example of an embodiment of the present invention will be described with reference to the drawings.

[0015] The present invention is a measuring device for easily measuring the anchorage strength of an anchor bolt embedded in various board materials such as wall and ceiling boards, or in a base material such as concrete.

[0016] Examples of board materials include wooden boards, calcium silicate boards, and resin boards. Examples of base materials include solidified high-compression strength materials such as concrete, brick, stone, and asphalt surfaces, as well as pre-solidified concrete members. Examples of anchor bolts include board anchors that penetrate the board and are fixed in place.

[0017] The anchor bolt tensile tester of the present invention basically has the following configuration. <Configuration> ·Hand-operated mechanical cylinders (21, 22, 23) and Straight displacement gauge (30), These are combined with the main body stand that is held through the stand table (10) in the hollow position. will be done.

[0018] The lower part (21) of the mechanical cylinder extends downward from the lower part of the stand table (10) through a first mounting hole (102) provided in the center of the table, and the measurement pin (31) of the straight displacement meter extends downward from a second mounting hole (103) provided near the first mounting hole (102).

[0019] A co-fastening nut (42), a shaft extension socket (44), a plate base of a displacement plate (43), a load cell (40), and a coupler (50) are connected and screwed together in this order on a single axis in the cylinder lower part (21), and the displacement plate (43) is sandwiched between the upper shaft extension socket (444) and the lower load cell (40). The tip of the displacement plate (43) protrudes toward the straight displacement meter (3), and the top surface of the tip of the plate is set in contact with the spherical tip (31S) of the measuring pin (31).

[0020] (Symmetric support of leg bars) The main stand is composed of a circular stand table (10) having a first central mounting hole and a second mounting hole nearby, and a plurality of leg rods (11A, 11B, 11C) provided on the symmetry axis of the stand table surface or at symmetrical positions about the symmetry axis, with the axis passing through the centers of the first and second mounting holes as the axis of symmetry. The plurality of leg rods (11A, 11B, 11C) support the stand table and the equipment on the stand table in midair from symmetrical support positions about the symmetry axis of the stand table.

[0021] (Selection handles in symmetrical positions) The mechanical cylinder is composed of a cylinder shaft 21 held in the vertical extension direction at the center position of the base table 10, a cylinder frame 22 that cylindrically surrounds the upper periphery of the cylinder shaft 21 excluding the lower part of the cylinder and regulates the vertical axial movement of the cylinder, and a cylinder box 23 that is in gear contact with the side of the cylinder shaft 21 and converts the axis to a horizontal axis rod 230.

[0022] The cylinder box 23 is arranged symmetrically about the axis of symmetry of the pedestal table 10 in a plan view. Horizontal shafts 230, perpendicular to the axis of symmetry, protrude outward from the left and right sides of the cylinder box 23. A rotary handle 24 is connected to and attached to at least one of the left and right horizontal shafts 230. By manually rotating the rotary handle 24 attached to at least one of the left and right horizontal shafts 230, the rotational torque, which has been changed in direction and torque by multiple gears within the cylinder box 23, is transmitted to the cylinder 21, causing the cylinder 21 to move upward along the cylinder axis. The horizontal shafts 230 are laid out so that they protrude symmetrically, and the rotary handle can be attached to either the left or right side, allowing rotation operation from either side. This allows for maneuverability according to the operating space and improves operability.

[0023] (Displacement plate clamping structure at the bottom of the cylinder 21) The lower part of the cylinder 21 penetrates through the first mounting hole (102) in the center of the pedestal table 10 and protrudes downward, where an axis extension socket (43) is attached via a connecting nut 42, and the cylinder 21 and axis extension socket (43) form a coaxial, integrated structure. Furthermore, the axis extension socket (43) is coaxially connected to the upper fixed surface of the lower load cell via a center pin (not shown) inserted in the center of the lower half and left and right connecting pins. In the present invention, the three-point perforated base of the displacement plate (43) is sandwiched between the upper fixed surface of the load cell and the axis extension socket (43). This forms an integrated sandwich structure between the axis extension socket (43) and the load cell detection surface.

[0024] On the other hand, the mechanical cylinder and the straight displacement meter 30 are fixed through a thick base plate to form an integrated rigid structure together with the base plate, and are maintained in a parallel positional relationship with each other. As a result, the axial movement of the cylinder, which is exactly perpendicular to the base plate, is accurately measured via the displacement plate (43) by a measurement pin that is also exactly perpendicular to the base plate.

[0025] (Load cell and coupler connection structure) Furthermore, at the bottom of the clamping structure, a load cell 40 (tension load cell) with its fixed surface facing upward and its load portion 41C facing downward is connected in a tensile tension state to the bolt cap AC of the anchor bolt via a box-shaped coupler 50 with an internal storage space. From the bottom of the cylinder to the load cell, an integrated connection structure is formed by shaft connections and pin connections, and the coupler and anchor bolt form a substantially integrated structure.

[0026] Meanwhile, by connecting the rod part of the load cell to the anchor bolt via a coupler, any misalignment between the anchor bolt direction and the cylinder axial direction is adjusted at the coupler connection point. This minimizes the deviation in the detection direction even if there is a misalignment between the direction of the load part of the load cell and the axial direction of the anchor bolt, and ensures accurate inspection conditions by pulling the anchor bolt straight in the bolt axial direction by the coupler.

[0027] (Integrated with anchor bolts using coupler structure) The box-shaped coupler 50 having a locking slit at the bottom locks the bolt cap AC of the anchor bolt from both sides in the symmetrical direction, and the coupler 50 is pulled up while being integrated with the bolt cap AC by the two opposing locking pieces.

[0028] In the first embodiment, the bolt cap has both sides of its lower surface sandwiched between two coupler tips 50E facing each other across a box-shaped coupler 50, forming an integral structure of the bolt cap and coupler (see FIG. 3).

[0029] (Intermediate connection of ball joint) On the other hand, in Example 2, a ball joint 45 is interposed between the load portion 41C of the load cell and the box-shaped coupler 50 for connection (see FIG. 8). That is, a spherical recess 451, which is the upper joint portion of the ball joint 45, is integral with the lower portion of the cylinder, the shaft extension socket, the displacement plate, and the load cell. On the other hand, a spherical portion 452, which is the lower joint portion of the ball joint 45, is integral with the box-shaped coupler 50 and the anchor bolt A, and misalignment in each axial direction is adjusted by the ball joint 45. At the same time, misalignment including the offset direction of each axial position and the pulling direction of the anchor bolt are adjusted by the coupler 50.

[0030] In particular, Example 2 is used when the bolt axis of the anchor bolt is extremely misaligned with the normal to fixed surface B, and the tension in each axial direction is maintained by the spherical connection while maintaining the tension of each axial force.

[0031] (Rotation amount display) On the side of the mechanical cylinder, around the protruding portion of the horizontal shaft 230, a scale indication 231M for indicating the amount of rotation is provided to visually confirm the amount of rotation of the horizontal shaft, i.e., the phase amount of the rotation operation of the rotary handle attached to it (Figures 1 and 2). In addition, around the handle insertion holes provided on the left and right sides of the head cover 6, a scale indicator 61M for the amount of rotation is provided to visually check the amount of rotation of the horizontal shaft, i.e., the phase amount of rotation of the rotary handle attached to it (Fig. 6). The scale indicator for the amount of rotation may be provided on at least one of the head cover and the mechanical joint.

[0032] By providing a scale display of the amount of rotation, tension testing using a cylinder can be performed while checking the amount of anchor bolt lift required for measurement, enabling accurate measurement and preventing accidents caused by excessive tension.

[0033] (Head cover 6) A cylindrical head cover with an open bottom may be attached to the stand table. The head cover 6 can prevent distortion of the holding state due to external contact interference.

[0034] <Features and effects> The load cell and displacement plate are coaxially connected (directly connected) near the anchor bolt head. The coaxially connected cylinders are mechanically raised by simply operating the manual handle of the mechanical cylinder.

[0035] This allows for lifting without using hydraulics or electric motors, making transportation and installation easy. It will be excellent for turning.

[0036] Furthermore, because the coupler, load cell, and displacement plate are directly connected to the anchor bolt head, there is no need to consider the elongation of the tensioning device configuration itself, and highly accurate measurement values ​​can be obtained.

[0037] <How to use> (Set state S1) The main frame is placed on a concrete surface, and the protruding ends of the anchor bolts are connected with couplers to establish a set state S1.

[0038] (Salvage state S2) From the set state S1, the hand-operated handle is inserted into the handle hole of the mechanical cylinder, and the handle is rotated by hand to raise the "cylinder assembly" consisting of the cylinder and its connecting device as a unit, to the raised state S2.

[0039] (measurement) The displacement of the displacement plate in this pulled-up state S2 and the tensile load are read by the load cell.

[0040] Furthermore, the present invention is not limited to the embodiments described above or shown in the drawings, and it is possible to make appropriate changes to the shape, configuration, adjust the number of parts, replace with known structures or other parts, extract some components, integrate parts, or combine configurations between embodiments, within the scope of the spirit of the present invention.

Claims

1. A hand-operated mechanical cylinder, a straight displacement meter equipped with a measuring pin; a main body stand that is placed on a measurement surface on which anchor bolts are fixed, and that holds the mechanical cylinder and the straight displacement meter parallel to each other and penetrating the main body stand on a stand table in a hollow position above the measurement surface, The lower part of the mechanical cylinder is inserted through a first mounting hole provided in the center of the table, and the measurement pin of the straight displacement meter is inserted through a second mounting hole provided in the vicinity of the first mounting hole, and protrudes downward from the lower part of the pedestal table. At least an axial extension socket, a plate base of a displacement plate, and a load cell are connected in this order on a single axis at the bottom of the cylinder, and the displacement plate is sandwiched between the upper axial extension socket and the lower load cell from above and below; Furthermore, the load cell is connected so that a loading portion faces a fixing portion of the anchor bolt, and the loading portion is connected to the anchor bolt via a box-shaped coupler.

2. 2. The anchor bolt tensile testing machine according to claim 1, wherein the main body stand is composed of a rigid stand table having a first central mounting hole and a second mounting hole nearby, and a plurality of leg bars provided on the axis of symmetry of the stand table surface or at left-right symmetrical positions about the axis of symmetry, with an axis passing through the centers of the first mounting hole and the second mounting hole as the axis of symmetry, and the plurality of leg bars support the stand table and the equipment on the stand table in midair from support positions that are left-right symmetrical about the axis of symmetry of the stand table.

3. The mechanical cylinder is composed of a cylinder shaft held in the vertical extension direction at the center position of the base table, a cylinder frame that cylindrically surrounds the upper periphery of the cylinder shaft excluding the lower part of the cylinder and regulates the vertical axial movement of the cylinder, and a cylinder box that is in contact with a gear on the side of the cylinder shaft and converts the axis to a horizontal axis rod, 3. The anchor bolt tensile testing machine according to claim 1 or 2, wherein the cylinder box is disposed symmetrically about the axis of symmetry of the stand table in plan view, and horizontal shaft rods perpendicular to the axis of symmetry protrude outward from left and right side parts of the cylinder box, respectively, and a rotation handle can be connected to and attached to at least one of the left and right horizontal shaft rods.

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