JP2014234864A - Load meter mounting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent deformation of a shaft by enlarging load resistance of a connection of the shaft and an embedded bolt, and to accurately measure a fixation load of the embedded bolt.SOLUTION: An attachment 1 couples a bolt 10 for connection and a screw hole 31S of a shaft 31 and couples a screw hole 11S for connection and an embedded bolt B, thereby connecting the embedded bolt and the shaft. A combination frame 2 includes a stage base 21 that is penetrated by the shaft, and a plurality of legs 22 and is provided so as to dispose the attachment 1 between the stage base 21 and an installation surface and provided to install a load meter L on the stage base 21 in such a manner that the shaft 31 is loosely inserted into a loose insertion hole provided in the center of the load meter L. A nut 33 is threaded with an outer screw of the shaft 31 and coupled to one terminal side of the shaft 31 so as to be fastened while holding the load meter L between the shaft and the stage base 21.

Description

  The present invention relates to a load measuring instrument mounting apparatus, for example, a load measuring instrument mounting for mounting an annular load measuring instrument for measuring a fixing load of a buried bolt partially embedded in an installation surface along the axis of the buried bolt. Relates to the device.

  Buried bolts are widely used for applying prestressed concrete with prestressed concrete in advance and for damming earth and sand on sloping ground. The buried bolt is installed on the installation surface so that a part thereof is buried in the installation surface such as the ground. The buried bolt is also called a buried anchor.

  However, if the tension force in the installation ground is loosened due to secular change, the buried bolt cannot obtain a predetermined support strength and does not make sense for installation. Moreover, if the tension | tensile_strength in an installation ground increases excessively when the load more than assumption is added to a burying bolt, burying bolt itself will be damaged, it may jump out to the ground surface, and safety | security may be impaired. For this reason, it is necessary to measure a change in tension of the buried bolt buried in the installation surface such as the ground using a load measuring meter.

  In Patent Document 1, as a technique of a tensile testing machine, a projecting portion of an anchor (buried bolt) buried in an installation surface and a center shaft are coupled by a coupling, and a shaft nut is tightened from the distal end side of the center shaft. Discloses a technique for measuring the tensile load (fixing load of the buried bolt) and the amount of displacement generated in the above. The center shaft is inserted through a cylindrical tension member. On the installation surface of the buried bolt, a base supported by a plurality of columns is provided. A through hole is formed at the center of the base, and the tension member is inserted through the through hole of the base.

Japanese Patent No. 3604107

  However, in the technique described in Patent Document 1, the center shaft is inserted into the tension member so that a gap is formed between the center shaft and the inner wall of the tension member. Accordingly, when the shaft nut is tightened from the tip end side of the center shaft, the center shaft may be inclined in the inner cylinder of the pulling member.

  In addition, since the technology described in Patent Document 1 employs a configuration in which the center shaft and the buried bolt are simply coupled by coupling, when a large bending load is applied to the connection portion between the center shaft and the buried bolt, Or the buried bolt may come off the coupling.

  As described above, there is a problem that the fixing load of the buried bolt cannot be accurately measured as a result of the center shaft being inclined in the inner cylinder of the tension member or the center shaft or the buried bolt being detached from the coupling. .

  The present invention has been made in view of such circumstances, and increases the load resistance of the connecting portion between the shaft and the buried bolt, suppresses the deformation of the shaft, and allows the fixing load of the buried bolt to be accurately measured. A meter mounting device is provided.

  The load measuring instrument mounting apparatus of the present invention is a load measuring instrument mounting apparatus for mounting an annular load measuring instrument for measuring a fixing load of a buried bolt partially buried in an installation surface along the axis of the buried bolt. A shaft having an outer screw formed on the outer peripheral surface including the one end side, and a screw hole formed on the other end side, and disposed substantially parallel to the axis of the buried bolt; A connecting screw hole screwed into the buried bolt, and a connecting bolt screwed into the screw hole of the shaft along the same central axis as the central axis of the connecting screw hole. An attachment that connects the tip of the buried bolt and the other end of the shaft by fastening the bolt and the screw hole of the shaft, and fastening the connecting screw hole and the buried bolt; The shaft A stage base having a through-hole to be passed therethrough and a plurality of legs that support the stage base on the installation surface, and the attachment is disposed between the stage base and the installation surface. An assembly base provided so that the load measurement meter can be installed on the stage base so that the shaft is loosely inserted into a loose insertion hole provided in a central portion of the load measurement meter, and the external screw of the shaft And a nut that is fastened to the one end side of the shaft so that the load measuring meter is clamped between the stage base and tightened.

In the load measuring instrument mounting device of the present invention, the shaft, the attachment, the assembly base, and the nut are provided so as to be separable from each other.
In the load measuring instrument mounting device of the present invention, the plurality of legs are provided so as to be separable from the stage base.

  In the load measuring instrument mounting device according to the present invention, the connecting bolt and the buried bolt are formed to have the same diameter and have a thread of the same pitch, and the buried bolt and the screw of the shaft are not connected to the attachment. The buried bolt and the shaft are connected by fastening a hole.

  In the load measuring instrument mounting device according to the present invention, the connecting bolt is provided so as to be freely rotatable around the central axis of the connecting screw hole in the attachment, and is fastened to the connecting bolt. A stopper is provided to hold the shaft on the stage base so that the shaft does not rotate around the central axis of the shaft.

  The load measuring instrument mounting device according to the present invention includes a pair of recesses formed on an outer peripheral surface of the shaft, and the stopper is engaged with the fitting unit that engages with the recess and the stage base. And have a joint.

  In the load measuring instrument mounting device according to the present invention, the connection bolt includes a cylindrical shaft portion in which a screw thread is formed, and a flange portion provided at one end portion of the shaft portion, and the attachment includes: The cap further includes a cap that exposes the tip of the cylindrical shaft and covers the flange, and the cap supports the flange so that the connecting bolt does not fall out of the cap. It has a support part.

  According to the load measuring instrument mounting device according to the present invention, it is possible to increase the load resistance of the connecting portion between the shaft and the buried bolt, suppress the deformation of the shaft, and accurately measure the fixing load of the buried bolt.

It is a disassembled perspective view which shows the structure of the load measuring meter attachment apparatus in embodiment of this invention. It is a perspective view which shows the structure of the load measuring meter attachment apparatus in embodiment of this invention. It is sectional drawing which shows the structure of the load measuring meter attachment apparatus in embodiment of this invention. It is a disassembled perspective view which shows the structure of the attachment contained in the load measuring meter attachment apparatus in embodiment of this invention. It is a figure which shows the structure of the attachment contained in the load measuring meter attachment apparatus in embodiment of this invention. FIG. 5A is a top view of the attachment. FIG.5 (b) is front sectional drawing of an attachment, Comprising: It is sectional drawing in the AA cut surface of Fig.5 (a). It is sectional drawing which shows the modification of the structure of the load measuring meter attachment apparatus in embodiment of this invention.

<Embodiment>
The structure of the load measuring instrument mounting apparatus in embodiment of this invention is demonstrated based on figures. FIG. 1 is an exploded perspective view showing a configuration of a load measuring instrument mounting device according to an embodiment of the present invention. FIG. 2 is a perspective view showing a configuration of the load measuring instrument mounting device according to the embodiment of the present invention. FIG. 3 is a cross-sectional view showing the configuration of the load measuring instrument mounting device according to the embodiment of the present invention.

  As shown in FIGS. 1 to 3, the load measuring device mounting apparatus according to the present invention includes an annular load measuring device L for measuring the fixing load of the embedded bolt B partially embedded in the installation surface. A device for mounting along an axis.

  As shown in FIGS. 1 to 3, the load measuring instrument mounting device of the present invention is configured to include an attachment 1, an assembly base 2, a shaft unit 3, and a stopper 4. The attachment 1, the gantry 2, the shaft unit 3, and the stopper 4 are provided so as to be separable from each other.

  As shown in FIGS. 1 to 3, the buried bolt B and the shaft unit 3 are connected by an attachment 1. The shaft unit 3 passes through the through hole 21 </ b> H of the assembly base 2. Further, the stopper 4, the washer 3 W, the load measuring meter L, and the shaft unit 3 are sequentially stacked on the stage base 21 of the mounting base 2 along the extending direction of the buried bolt B.

  Here, before describing the configuration of the load measuring instrument mounting device of the present invention, first, the configuration of the buried bolt B and the load measuring meter L will be described.

  The buried bolt B is a bolt partially buried in an installation surface such as concrete. By utilizing the tensile force of the bolt, it is possible to prevent the installation surface such as the ground from collapsing. Bolts are used to prestress concrete with prestressed concrete, to block landslides on slopes, to stabilize slopes such as cliffs, to prevent the structure from falling or floating, It is mainly used in the civil engineering and construction field for the construction of retaining dams. The buried bolt B is also called a buried anchor or a ground anchor.

  A specific configuration of the buried bolt B will be described. The buried bolt B has a fixing portion that is buried in the installation surface and fixed on the installation surface, and a protruding portion that is exposed to protrude on the installation surface. In the circumferential direction of the buried bolt B, a screw thread is formed.

  Installation of the buried bolt B is performed as follows. First, after inserting one end of the bolt into the installation surface, the fixing unit is filled with grout, and the fixing unit of the bolt is fixed in the installation surface.

  The load measuring meter L is comprised from the cyclic | annular measuring meter main body, the indicator (not shown), and the cable which connects a measuring meter main body and a display as FIG. 1-3 shows. The annular measurement main body is formed of a cylindrical body, and a plurality of strain gauges (not shown) are provided on the upper surface of the circular annular portion on the upper surface. However, the shape of the measurement main body is not limited to the cylindrical body. A loose insertion hole is formed at the center of the annular measuring instrument main body. A shaft 31 of the shaft unit 3 described later is loosely inserted into the loose insertion hole.

  The configuration of the buried bolt B and the load measuring meter L has been described above.

  Next, specific configurations of the attachment 1, the gantry 2, the shaft unit 3, and the stopper 4 will be described as components of the load measuring instrument mounting device of the present invention. First, the configuration of the attachment 1 will be described. As shown in FIG. 3, the attachment 1 connects the tip of the buried bolt B and the lower end of the shaft 31 of the shaft unit.

  FIG. 4 is an exploded perspective view showing the configuration of the attachment 1. FIG. 5 is a diagram illustrating a configuration of the attachment 1. FIG. 5A is a top view of the attachment. FIG.5 (b) is front sectional drawing of an attachment, Comprising: It is sectional drawing in the AA cut surface of Fig.5 (a).

  As shown in FIGS. 1 to 5, the attachment 1 includes a connecting bolt 10, a connecting screw hole 11 </ b> S, a first cap 11, and a second cap 12. In addition, the structure which combined the 1st cap 11 and the 2nd cap 12 respond | corresponds to the cap of this invention. Since the attachment bolt 10 is extended by attaching the attachment 1 to the immersion bolt B, the connecting bolt 10 is also called an extension bolt.

  As shown in FIGS. 1 to 3, the connecting bolt 10 is screwed into the screw hole 31 </ b> S of the shaft 31 of the shaft unit 3 along the same central axis as the connecting screw hole 11 </ b> S. The connecting bolt 10 and the screw hole 31S of the shaft 31 are fastened by screwing. Thereby, the attachment 1 and the shaft 31 are connected. At this time, the shaft 31 is disposed substantially in parallel along the axis of the buried bolt B. The connection bolt 10 is provided in the attachment 1 so as to be freely rotatable around the central axis of the connection screw hole 11S.

  More specifically, as shown in FIG. 4, FIG. 5A and FIG. 5B, the connecting bolt 10 includes a cylindrical shaft portion 10S in which a thread is formed, and the shaft portion. And a flange portion 10T provided at one end portion. Of the connecting bolt 10, the flange portion side end portion of the shaft portion 10 </ b> H and the flange portion 10 </ b> T are accommodated in the first cap 11 and the second cap 12. At this time, the flange portion side end portion of the shaft portion 10 </ b> S and the flange portion 10 </ b> T of the connecting bolt 10 are not fixed to the first cap 11 and the second cap 12. As shown in FIG. 5B, the first cap 11 and the second cap 12 have a slight clearance between the shaft portion 10S and the outer peripheral surface of the flange portion side end portion of the shaft portion 10S. It is formed. Similarly, the 1st cap 11 and the 2nd cap 12 are formed so that a slight clearance may be provided between the flange part 10T along the outer peripheral surface of the flange part 10T. Further, as shown in FIGS. 5A and 5B, the central axis of the connecting bolt 10 is set to overlap the central axis of the connecting screw hole 11S. Thereby, the connecting bolt 10 can freely rotate around the central axis of the connecting screw hole 11 </ b> S in the attachment 1.

  As shown in FIGS. 1 to 3, the connecting screw hole 11 </ b> S is screwed into the buried bolt B. The connecting screw hole 11S and the buried bolt B are fastened by screwing. Thereby, the buried bolt B and the attachment 1 are connected. As shown in FIGS. 4 and 5B, the connecting screw hole 11 </ b> S is formed in the first cap 11.

  As shown in FIG. 5B, the combined structure of the first cap 11 and the second cap 12 exposes the tip end portion of the shaft portion 10S of the connecting bolt 10 and covers the flange portion 10T.

  As shown in FIGS. 4, 5 (a), and 5 (b), the first cap 11 and the second cap 12 are formed in a semi-cylindrical shape. The first cap 11 and the second cap 12 are combined by two attachment bolts 1B so as to sandwich the flange portion side end of the shaft portion 10S and the flange portion 10T of the connecting bolt 10.

  As shown in FIG. 5, the first cap 11 includes a flange housing wall 11H and a flange housing base 11T. The second cap 12 has a flange housing wall 12H. The flange housing wall 11H, the flange housing base 11T, and the flange housing wall 12H correspond to the support portion of the present invention.

  As shown in FIG. 4, the flange accommodating wall 11 </ b> H, the flange accommodating base 11 </ b> T, and the flange accommodating wall 12 </ b> H accommodate the flange portion 10 </ b> T of the connecting bolt 10. The flange accommodating wall 11H, the flange accommodating base 11T, and the flange accommodating wall 12H are provided on the flange portion of the connecting bolt 10 so that the connecting bolt 10 does not fall out of the combined structure of the first cap 11 and the second cap 12. Support 10T.

  The structure of the attachment 1 has been described above.

  Next, the structure of the mounting base 2 will be described. As shown in FIGS. 1 to 3, the assembly base 2 includes a stage base 21, a plurality of legs 22, a leg attachment hole 23, a stopper support portion 24 </ b> D, and a stopper fixing hole 24 </ b> H. Has been. The assembly base 2 has at least three legs 22 or more. Here, it is assumed that the mount base 2 has three legs 22.

  As shown in FIGS. 1 and 2, the stage base 21 is formed of a triangular plate material. The stage base 21 has a through hole 21H. The stage base 21 is not limited to a triangular shape, and may be a circular shape or a polygonal shape that is equal to or greater than a square shape.

  As shown in FIGS. 1 and 3, the through-hole 21 </ b> H is formed in a substantially central portion of the stage base 21. The through hole 21H allows the shaft 31 of the shaft unit 3 to pass through. As shown in FIG. 3, the inner diameter of the through hole 21 </ b> H corresponds to the outer diameter of the shaft 31. Specifically, the inner diameter of the through hole 21 </ b> H is set slightly smaller than the outer diameter of the shaft 31.

  As shown in FIGS. 1 to 3, the plurality of legs 22 support the stage base 21 on the installation surface. A screw thread is formed on the end of each leg 22 on the table side. Thereby, the plurality of legs 22 are attached to the leg attachment holes 23 of the stage base 21 by screwing the screws of the legs 22 and the leg attachment holes 23. On the other hand, a curved surface is formed at the end of each leg 22 on the installation surface side. Thereby, the front-end | tip part of each leg 22 can be made to contact | abut with respect to an installation surface by point contact. As a result, the stage base 21 can be easily adjusted so as to be arranged parallel to the installation surface. The plurality of legs 22 are provided so as to be separable from the stage base 21.

  The leg attachment hole 23 is formed on the outer peripheral side of the stage base 21. The number of leg attachment holes 22 corresponds to the number of legs 22. A screw thread is formed on the inner wall of the leg attachment hole 22. The legs 22 are attached to the leg attachment holes 22.

  The pair of stopper support portions 24 </ b> D are formed in a slit shape on one side surface of the stage base 21. This stopper support portion 24 </ b> D is provided to support the stopper 4. An engaging portion 42 of the stopper 4 described later is inserted into the stopper support 24D.

  The stopper fixing hole 24 </ b> H is provided to fix a stopper 4 described later to the stage base 21. A screw thread is formed on the inner wall of the stopper fixing hole 24H. A stopper attaching screw 42S described later is attached to the stopper fixing hole 24H.

  As shown in FIGS. 1 to 3, the assembly base 2 is provided such that the attachment 1 is disposed between the stage base 21 and the installation surface. In addition, the gantry 2 is provided so that the load measuring meter L can be installed so that the shaft 31 of the shaft unit 3 is loosely inserted into the loose insertion hole provided in the central portion of the load measuring meter L.

  The configuration of the gantry 2 has been described above.

  Next, the configuration of the shaft unit 3 will be described. As shown in FIGS. 1 to 3, the shaft unit 3 includes a holding cover portion 30, a shaft 31, an annular bearing 32, a nut 33, a shaft cover 3 </ b> C, an annular plate 30 </ b> P, and a washer 3 </ b> W. It consists of The holding cover portion 30, the shaft 31, the annular bearing 32, the nut 33, the shaft cover 3C, the annular plate 30P, and the washer 3W are provided so as to be separable from each other. Note that the holding cover portion 30, the annular plate 30P, the annular bearing 32, and the nut 33 are assembled in advance to form one coupling member.

  As shown in FIGS. 1 to 3, the holding cover part 30 is provided so as to sandwich the flange part 33 </ b> H of the nut 33, the annular bearing 32, and the annular plate 30 </ b> P along the axis of the shaft 31. As shown in FIG. 3, a through hole for fixing the holding cover 30 to the annular plate 30 </ b> P is provided at the end of the holding cover 30 on the installation surface side. The positions of the through holes correspond to the positions of screw holes formed on the outer periphery of the annular plate 30P described later. Accordingly, as shown in FIGS. 1 to 3, the screw is attached to the through hole of the holding cover portion 30 and the screw hole of the annular plate 30 </ b> P. Thereby, the holding cover part 30 is attached to the annular plate 30P.

  As shown in FIGS. 1 to 3, the shaft 31 is formed in a cylindrical shape. As shown in FIG. 3, the shaft 31 includes an external screw formed on the outer peripheral surface including one end side to which the nut 33 is attached, and a screw hole formed on the other end side to which the connecting bolt 10 is connected. 31S.

  As shown in FIG. 3, a nut 33 is screwed onto the outer screw of the shaft 31. As a result, the nut 33 is fastened to one end of the shaft 31. The shaft portion 10S of the connecting bolt 10 is screwed into the screw hole 31S of the shaft 31. Thereby, the shaft 31 and the attachment 1 are connected. At this time, the shaft 31 is disposed substantially in parallel along the axis of the buried bolt B.

  The shaft 31 has a pair of recesses 31D. The pair of recesses 31D are formed in a concave shape on the outer peripheral surface of the shaft 31 so as to face each other. The distance between the recesses 31 </ b> D is set so as to correspond to the distance between a pair of shaft holding portions 41 of the stopper 4 described later. More specifically, the distance between the pair of recesses 31 </ b> D of the shaft 31 is set to be slightly smaller than the distance between the pair of shaft holding portions 41. Thereby, when the shaft 31 is accommodated in the shaft accommodating portion 4 </ b> D, the pair of recesses 31 </ b> D of the shaft 31 are fitted to the pair of shaft holding portions 41.

  Here, it has been described that the shaft 31 is formed in a cylindrical shape. However, the shaft 31 may be formed in a cylindrical shape. In this case, the screw hole 31 of the shaft 31 does not penetrate the shaft 31. At this time, the length of the screw hole 31S of the shaft 31 is set to such a length that at least the shaft portion 10S of the connecting bolt 10 can be accommodated.

  As shown in FIG. 3, the annular bearing 32 is configured by a perforated annular body in which an upper frame 32P and a lower frame 32P are incorporated so as to face each other via a bearing mechanism 32B. The annular bearing 32 is disposed between the annular plate 30P and the flange portion 33H of the nut so as to surround the outer periphery of the shaft 31.

  The nut 33 is formed in a cylindrical shape. The nut 33 has a flange portion 33H. A screw thread is formed on the inner wall of the cylindrical portion of the nut 33. This thread is formed so as to correspond to the diameter and pitch of the thread formed on the outer thread of the shaft 31. The flange portion 33 </ b> H is formed so as to protrude along the outer periphery of the nut 33. The lower surface of the flange portion 33H is brought into contact with the upper surface of the upper frame 2P of the annular bearing 32 as shown in FIG.

  As shown in FIG. 3, the nut 33 is mounted on the annular bearing 32, and the tip end portion of the shaft 31 is clamped by sandwiching a load measuring meter L attached between the annular holding plate 30 </ b> P and the stage base 21. Fastened to the side.

  More specifically, the nut 33 is attached to the shaft 31 from the distal end side of the shaft 31 in a state of being attached on the annular bearing 2. Then, the nut 33 is screwed onto the shaft 31, and the load measuring meter L is sandwiched between the stage base 21 and tightened. Thereby, the nut 3 is fastened to the tip end side of the shaft 31.

  As shown in FIGS. 1 to 3, the shaft cover 3 </ b> C is attached to the tip portion of the shaft unit 3. The shaft cover 3C is formed in a circular dish shape. As shown in FIGS. 1 to 3, a through hole is formed in the central portion of the shaft cover 3 </ b> C. As shown in FIG. 3, a screw thread having the same diameter and pitch as the outer screw of the shaft 31 is formed on the inner wall of the side surface of the shaft cover 3 </ b> C. The screw on the inner wall of the side surface of the shaft cover 3 </ b> C is screwed into the outer screw of the shaft 31. Thereby, the shaft cover 3 </ b> C is attached to the tip portion of the shaft 31.

  The annular plate 30P is configured by a disc body. However, the shape of the annular plate 30P is not limited to the disc body. As shown in FIGS. 1 to 3, the annular plate 30 </ b> P is disposed between the annular bearing 32 and the load meter L. A through hole is formed at the center of the annular plate 30P. The inner diameter of the through hole of the annular plate 30 </ b> P is formed corresponding to the outer diameter of the shaft 31. Further, a screw thread having the same pitch and the same diameter as the outer screw of the shaft 31 is formed on the inner wall of the through hole of the annular plate 30P. The outer screw of the shaft 31 and the through hole of the annular plate 30P are screwed together. Thereby, the annular plate 30P is attached to the shaft 31. Further, as described above, screw holes are formed on the outer periphery of the annular plate 30P. The position of the screw hole corresponds to the position of the through hole of the holding cover part 30.

  As shown in FIGS. 1 to 3, the washer 3 </ b> W is formed in a disk shape having a through hole. As shown in FIGS. 1 and 3, the shaft 31 is inserted into the through hole of the washer 3W. As shown in FIG. 3, the washer 3 </ b> W is disposed on the stopper 4 provided on the stage base 21. A load meter L is provided on the washer 3W.

  The configuration of the shaft unit has been described above.

  Next, the structure of the stopper 4 will be described. As shown in FIGS. 1 to 3, the stopper 4 is formed in a flat plate shape in a fork manner. The stopper 4 includes a pair of shaft holding portions 41, a shaft accommodating portion 4D, and an engaging portion 42. In addition, a pair of shaft holding | maintenance part 41 and shaft accommodating part 4D respond | correspond to the fitting part of this invention.

  As shown in FIG. 3, the pair of shaft holding portions 41 is formed on one end portion side of the stopper 4 so as to sandwich the shaft housing portion 24D. The distance between the pair of shaft holding portions 41 is set so as to correspond to the distance between the pair of recesses 31 </ b> D of the shaft 31. More specifically, the distance between the pair of shaft holding portions 41 is set to be slightly larger than the distance between the pair of recesses 31 </ b> D of the shaft 31. Thereby, a pair of recessed part 31D of the shaft 31 fits with a pair of shaft holding part 41 mutually. As shown in FIG. 3, screw holes into which stopper mounting screws 41 </ b> S are inserted are formed at the distal ends of the pair of shaft holding portions 41. The stopper mounting screw 41 </ b> S is screwed into the screw hole of the stage base 21 through the through hole of the shaft holding portion 41. Thereby, the tip end portion of the shaft holding portion 41 of the stopper 4 is fixed to the stage base 21.

  As shown in FIG. 3, the shaft housing portion 4 </ b> D is formed between the pair of shaft holding portions 41. In the shaft housing portion 4D, the base portion side of the shaft holding portion 41 is formed in an arc shape. The arc of the shaft housing 4D is set so as to correspond to the outer diameter of the shaft 31. More specifically, the radius of the arc of the shaft housing portion is set to be slightly smaller than the cross-sectional radius of the shaft 31. Thereby, the shaft 31 can be accommodated in the shaft accommodating portion 4D.

  As shown in FIG. 3, the engaging portion 42 is formed of a plate material corresponding to the slit width of the stopper support portion 24 </ b> D of the stage base 21. The engaging portion 42 is fitted to the stopper support portion 24D. Further, as shown in FIG. 3, two engaging portions 42 are provided in the stopper 4 corresponding to the number of the stopper support portions 24 </ b> D.

  Further, as shown in FIGS. 1 and 3, a screw hole into which the stopper attaching screw 42 </ b> S is inserted is formed on the engaging portion 42 side of the stopper 4 along the extending direction of the engaging portion 42. Is formed.

  The stopper mounting screw 42S is screwed into a stopper fixing hole 24H formed on the side surface of the stage base 21 through a through hole provided on the engaging portion 42 side of the stopper 4. Thereby, the engaging part 42 side of the stopper 4 is fixed to the side surface of the stage base 21.

  The configuration of the stopper 4 has been described above.

  Next, a method for measuring the fixing load of the buried bolt B by attaching the load meter L along the buried bolt B using the load measuring instrument mounting device of the present invention will be described with reference to the drawings.

  First, as shown in FIGS. 1 and 3, the buried bolt B is screwed into the connecting screw hole 11S of the attachment 1, and the buried bolt B and the connecting screw hole 11S are fastened. Thereby, the buried bolt B and the attachment 1 are connected. At this time, the connecting bolt 10 of the attachment 1 is disposed on the extension line of the buried bolt B.

  Next, as shown in FIGS. 1 and 3, the mounting base 2 is placed on the installation surface so that the through hole 21 </ b> H of the stage base 21 is disposed on the extension line of the buried bolt B and the connecting bolt 10.

  Next, as shown in FIG. 1 and FIG. 3, the washer 3W and the load measuring meter L are arranged on the stage base 21 so as to sequentially overlap.

  Then, the shaft 31 is inserted into the loose insertion hole of the load measuring meter L, the through hole of the washer 3W, and the through hole 21H of the stage base 21.

  Next, by screwing the screw, the screw hole 31S of the shaft 31 and the connecting bolt 10 are fastened. As a result, the shaft 31 and the buried bolt B are connected via the attachment 1. In this state, the connecting bolt B connected to the shaft 31 rotates freely around the central axis of the connecting bolt B in the attachment 1. Thus, the direction of the recess 31D of the shaft 31 is adjusted so that the shaft accommodating portion 4D of the stopper 2 can be fitted into the recess 31D of the shaft 31 while rotating the shaft 31 about the central axis of the connecting bolt B. be able to.

  Next, as shown in FIGS. 1 and 3, the stopper 4 is inserted between the stage base 21 and the washer 3 </ b> W, and the shaft accommodating portion 4 </ b> D and the shaft holding portion 41 of the stopper 4 are recessed 31 </ b> D of the shaft 31. To fit. As a result, the shaft 31 cannot rotate around the central axis of the connecting bolt B. Further, the engaging portion 42 is engaged with the stopper support portion 24D. As a result, the stopper 4 is held on the stage base 21. Further, the stopper mounting screw 41S is screwed into a screw hole formed in the side surface of the stage base 21, and the stopper mounting screw 42S is screwed into the stopper fixing hole 24H. Thereby, the stopper 4 is fixed to the stage base 21.

  Next, as shown in FIGS. 1 and 3, the connecting member of the holding cover portion 30, the annular plate 30 </ b> P, the annular bearing 32, and the nut 33 is screwed into the external screw at the upper end portion of the shaft 31 to measure the load. A total L is sandwiched between the stage base 21. Thereby, the stopper 4, the washer 3W, the load meter L, the annular plate 30P, the annular bearing 32, and the nut 33 are sequentially stacked in the extending direction of the buried bolt B.

  Then, as shown in FIG. 3, the nut 33 is fastened to the upper end portion of the shaft 31 by further rotating and tightening the coupling member of the holding cover portion 30, the annular plate 30 </ b> P, the annular bearing 32, and the nut 33. Thereby, the load measuring meter L is tightened in a state of being sandwiched between the washer 3W and the annular plate 30P. As a result, a load is applied to the plurality of strain gauges of the load measuring meter L, and the fixing load of the buried bolt B on the installation surface can be measured.

  When the coupling member of the holding cover portion 30, the annular plate 30P, the annular bearing 32, and the nut 33 is screwed into the outer screw at the upper end portion of the shaft 31, the center of the shaft 31 is placed at the load measuring meter L. It adjusts so that it may arrange | position to the center part of the loose insertion hole. Thereby, since the dispersion | variation in the distance of each of the some strain gauge of the load measuring meter L and the outer peripheral surface of the shaft 31 can be decreased, the fixing load of the burying bolt B can be measured correctly.

  Finally, as shown in FIGS. 2 and 3, the shaft cover 3 </ b> C is attached to the upper end portion of the shaft 31. Thereby, the upper end part of the shaft 3 is protected.

  As described above, the method for measuring the fixing load of the buried bolt B by attaching the load meter L along the buried bolt B using the load measuring instrument attaching device of the present invention has been described.

  Next, the structure of the modification of the load measuring instrument attachment apparatus in embodiment of this invention is demonstrated. FIG. 6 is a cross-sectional view showing a modified example of the configuration of the load measuring instrument mounting device according to the embodiment of the present invention.

  As shown in FIG. 6, this modification is also an apparatus for attaching an annular load measuring meter L for measuring the fixing load of the buried bolt B partially buried in the installation surface along the axis of the buried bolt B. It is. As shown in FIG. 6, the modified example of the load measuring instrument mounting device according to the present invention includes an attachment 1, a stage base 21, a shaft unit 3, and a stopper 4.

  Here, FIG. 3 and FIG. 6 are compared. In FIG. 3, the gantry 2 with the legs 22 is provided on the installation surface. On the other hand, in FIG. 6, the stage base 21 is provided on the installation surface without the legs 22. In FIG. 3, the shaft 31 and the buried bolt B are connected by the attachment 1. On the other hand, in FIG. 6, the shaft 31 and the buried bolt B are directly connected without using the attachment 1. In these respects, FIG. 3 and FIG. 6 are different from each other.

  As described above, in the gantry 2, the plurality of legs 22 are provided so as to be separated from the stage base 21. In the example shown in FIG. 6, all of the plurality of legs 22 are removed from the stage base 21. As shown in FIG. 6, the buried bolt B is screwed into the screw hole 31 </ b> S of the shaft 31. Thereby, the buried bolt B and the shaft 31 are connected.

  Note that the connecting bolt 10 and the connecting screw hole 11S of the attachment 1 are formed to have the same diameter and have screw threads with the same pitch. Accordingly, the buried bolt B can be screwed into the screw hole 31S of the shaft 31 and the connecting bolt 10 of the attachment 1. As a result, the same shaft 31 can be made to correspond to both the embodiment shown in FIG. 3 and the embodiment shown in FIG.

  In addition, since the structure and arrangement | positioning of each member arrange | positioned on the stage base 21 are the same as that of FIG. 3, detailed description is abbreviate | omitted.

  Next, a method for measuring the fixing load of the buried bolt B by attaching the load meter L along the buried bolt B using a modification of the load measuring instrument mounting device according to the embodiment of the present invention will be described. .

  First, as shown in FIG. 6, the stage base 21 is placed on the installation surface so that the buried bolt B is inserted into the through hole 21 </ b> H of the stage base 21.

  Next, as shown in FIG. 6, the washer 3 </ b> W and the load measuring meter L are arranged on the stage base 21 so as to sequentially overlap.

  Then, the shaft 31 is inserted into the loose insertion hole of the load measuring meter L, the through hole of the washer 3W, and the through hole 21H of the stage base 21.

  Next, the screw hole 31S of the shaft 31 and the buried bolt B are fastened by screwing the screw. As a result, the shaft 31 and the buried bolt B are directly connected without the attachment 1 being interposed.

  Next, as shown in FIG. 6, the stopper 4 is inserted between the stage base 21 and the washer 3 </ b> W, and the shaft accommodating portion 4 </ b> D of the stopper 4 is fitted into the recess 31 </ b> D of the shaft 31. As a result, the shaft 31 cannot rotate around the central axis of the connecting bolt B. Further, the engaging portion 42 is engaged with the stopper support portion 24D. As a result, the stopper 4 is held on the stage base 21. Further, the stopper mounting screw 41S is screwed into a screw hole formed in the side surface of the stage base 21, and the stopper mounting screw 42S is screwed into the stopper fixing hole 24H. Thereby, the stopper 4 is fixed to the stage base 21.

  As shown in FIG. 6, the connecting member of the holding cover portion 30, the annular plate 30 </ b> P, the annular bearing 32, and the nut 33 is screwed to the external screw at the upper end portion of the shaft 31, so Between. Subsequent processing is the same as that described above with reference to FIGS.

  As described above, the method of measuring the fixing load of the buried bolt B by attaching the load meter L along the buried bolt B using the modification of the load measuring instrument mounting device of the present invention has been described.

  As described above, the load measuring instrument mounting apparatus according to the embodiment of the present invention uses the annular load measuring instrument L for measuring the fixing load of the buried bolt B partially embedded in the installation surface as the axis of the buried bolt B. It is an apparatus for attaching along. The load measuring device mounting device includes a shaft 31, an attachment 1, a mounting base 2, and a nut 33. The shaft 31 has an external screw formed on the outer peripheral surface including the one end side, and a screw hole 31S formed on the other end side. The shaft 31 is disposed substantially parallel along the axis of the buried bolt B. The attachment 1 includes a connecting screw hole 11S that is screwed into the buried bolt B, and a connecting bolt 10 that is screwed into the screw hole 31S of the shaft 31 along the same central axis as the connecting screw hole 11S. The attachment 1 fastens the connecting bolt 10 and the screw hole 31S of the shaft 31 and fastens the connecting screw hole 11S and the buried bolt B to thereby fix the tip of the buried bolt B and the other end of the shaft 31. Are connected. The assembly base 2 includes a stage base 21 having a through hole 21H through which the shaft 31 passes, and a plurality of leg portions 22 that support the stage base 21 on the installation surface. The assembly base 2 is provided so that the attachment 1 is disposed between the stage base 21 and the installation surface, and the shaft 31 is loosely inserted into the loose insertion hole provided in the central portion of the load measuring meter L. The load meter L is provided so that it can be installed on the stage base 21. The nut 33 is screwed into an external screw of the shaft 31 and is fastened to one end portion of the shaft 31 so as to sandwich and tighten the load measuring meter L between the stage base 21.

  In this way, the shaft 31 is connected to the buried bolt B by the attachment 1 along the buried bolt B. Thereby, the buried bolt B can be extended by the shaft 31 along the axis of the buried bolt B. At this time, the buried bolt B and the attachment 1 are connected by screwing of the screw of the connecting screw hole 11 </ b> S of the buried bolt B and the attachment 1. Further, the attachment 1 and the shaft 31 are connected by screwing the connecting bolt 10 of the attachment 1 and the screw of the screw hole 31 </ b> S of the shaft 31. Accordingly, since the buried bolt B and the shaft 31 are firmly connected by the attachment 1, the load resistance of the connecting portion between the shaft 31 and the buried bolt B can be increased. Therefore, even if the nut 33 is fastened directly to one end portion of the shaft 31 connected to the buried bolt B by screwing of the screw, the shaft 31 can be prevented from being inclined and deformed. For this reason, the tightening force of the nut 33 is applied in a direction substantially perpendicular to the annular portion of the load measuring meter L. Therefore, the fixing load of the buried bolt B can be accurately measured.

  Therefore, according to the load measuring instrument mounting device in the embodiment of the present invention, the load resistance of the connecting portion between the shaft and the buried bolt can be increased, the deformation of the shaft can be suppressed, and the fixing load of the buried bolt can be accurately measured. .

  Further, in the load measuring instrument mounting device according to the embodiment of the present invention, the shaft 31, the attachment 1, the assembly base 2, and the nut 33 are provided so as to be separable from each other. Thereby, each member from which specifications, such as length, a size, and a load resistance, differ, can be selected according to the attachment situation of a load meter.

  In the load measuring instrument mounting device according to the embodiment of the present invention, the plurality of leg portions 22 are provided so as to be separable from the stage base 21. Thereby, the fixing load of the buried bolt B can be measured in a state where the stage base 21 is directly placed on the installation surface.

  In the load measuring instrument mounting apparatus according to the embodiment of the present invention, the connecting bolt 10 and the buried bolt B are formed to have the same diameter and have screw threads with the same pitch. Further, the buried bolt B and the shaft 31 are coupled by fastening the buried bolt B and the screw hole 31 </ b> S of the shaft 31 without using the attachment 1. Thereby, the shaft 31 can be fastened to the connection bolt 10 of the attachment 1 as well as the buried bolt B. Therefore, two modes of a mode in which the buried bolt B and the shaft 31 are directly coupled and a mode in which the buried bolt B and the shaft 31 are indirectly coupled via the attachment 1 are realized by using one shaft 31. be able to.

  In the load measuring instrument mounting device according to the embodiment of the present invention, the connecting bolt 10 is provided in the attachment 1 so as to be freely rotatable around the central axis of the connecting screw hole 11S. The load measuring device mounting device includes a stopper 4. The stopper 4 holds the shaft 31 on the stage base 21 so that the shaft 31 fastened to the connecting bolt 10 does not rotate around the central axis of the shaft 31. Accordingly, the stopper 4 can be held on the stage base 21 while rotating the shaft 31 about the axis of the connecting bolt B to adjust the direction of the shaft 31.

  The load measuring instrument mounting device according to the embodiment of the present invention includes a pair of recesses 31 </ b> D formed on the outer peripheral surface of the shaft 31. The stopper 4 includes a fitting portion (shaft housing portion 4D, shaft holding portion 41) that fits into the recess 31D, and an engaging portion 42 that is engaged with the stage base 21. Thereby, the stopper 4 can be reliably held on the stage base 21.

  In the load measuring instrument mounting device according to the embodiment of the present invention, the connecting bolt 10 has a cylindrical shaft portion 10S formed with a thread and a flange portion 10T provided at one end of the shaft portion 10S. doing. The attachment 1 further includes caps 11 and 12 that cover the flange portion 10T while exposing the tip end portion of the cylindrical shaft portion 10S. The caps 11 and 12 have a support portion that supports the flange portion 10T so that the connecting bolt 10 does not fall out of the caps 11 and 12. Thereby, it can set so that the said connecting bolt 10 can be rotated freely in the state which hold | maintained the connecting bolt 10 in the attachment 1. FIG.

  The present invention has been described above based on the embodiment. The embodiment is an exemplification, and various modifications, increases / decreases, and combinations may be added to the above-described embodiments without departing from the gist of the present invention. It will be understood by those skilled in the art that modifications to which these changes, increases / decreases, and combinations are also within the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Attachment 1B Attachment bolt 10 Connection bolt 10J Shaft part 10T Flange part 11 1st cap 11S Connection screw hole 11H Flange accommodation wall 11T Flange accommodation stand 12 2nd cap 12H Flange accommodation wall 2 Assembly stand 21 Stage stand 21H Through hole 22 Leg 23 Leg mounting hole 24D Stopper support part 24H Stopper fixing hole 3 Shaft unit 3C Shaft cover 3W Washer 30 Holding cover part 30P Annular plate 31 Shaft 31S Screw hole 32 Annular bearing 32B Bearing mechanism 32P Upper frame, lower Frame nut 33
4 Stopper 4D Shaft receiving portion 41 Shaft holding portion 42 Engagement portion 41S, 42S Stopper mounting screw B Bench

Claims (7)

A load measuring instrument mounting device for mounting an annular load measuring instrument for measuring a fixing load of a buried bolt partially embedded in an installation surface along the axis of the buried bolt,
A shaft having an outer screw formed on the outer peripheral surface including the one end side, and a screw hole formed on the other end side, and arranged substantially in parallel along the axis of the buried bolt;
A connecting screw hole screwed into the buried bolt; and a connecting bolt screwed into the screw hole of the shaft along the same central axis as the central axis of the connecting screw hole; And the screw hole of the shaft, and by fastening the connecting screw hole and the buried bolt, an attachment for connecting the tip of the buried bolt and the other end of the shaft;
A stage base having a through-hole through which the shaft passes, and a plurality of legs that support the stage base on the installation surface, and the attachment is arranged between the stage base and the installation surface An assembly base provided so that the load measuring meter can be installed on the stage base so that the shaft is loosely inserted into a loose insertion hole provided in a central portion of the load measuring meter;
A load measuring device mounting device including a nut that is screwed to the outer screw of the shaft and is fastened to the one end side of the shaft so as to sandwich and tighten the load measuring meter with the stage base .   The load measuring instrument mounting device according to claim 1, wherein the shaft, the attachment, the mounting base, and the nut are provided so as to be separable from each other. The load measuring instrument attachment device according to any one of claims 1 to 3, wherein the plurality of leg portions are provided so as to be separable from the stage base. The extension bolt and the buried bolt are formed with the same diameter and have screw threads with the same pitch,
The load measuring meter attachment apparatus of any one of Claims 1-3 which connect the said burying bolt and the said shaft by fastening the said screw hole of the said burying bolt and the said shaft without passing through the said attachment. The connecting bolt is provided in the attachment so as to be freely rotatable around the central axis of the connecting screw hole,
5. The stopper according to claim 1, further comprising: a stopper that holds the shaft on the stage base so that the shaft fastened to the coupling bolt does not rotate around the central axis of the shaft. Load measuring instrument mounting device. A pair of recesses formed on the outer peripheral surface of the shaft;
The load measuring meter mounting device according to claim 5, wherein the stopper includes a fitting portion that fits into the concave portion and an engaging portion that engages with the stage base. The connecting bolt has a cylindrical shaft portion in which a screw thread is formed, and a flange portion provided at one end of the shaft portion,
The attachment further includes a cap that exposes the tip of the cylindrical shaft portion and covers the flange portion;
The load measuring meter mounting device according to claim 5 or 6, wherein the cap has a support portion that supports the flange portion so that the connecting bolt does not fall out of the cap.

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