JP5798013B2 - Wedge member press-fitting tool for connecting steel bars - Google Patents

Description

  The present invention relates to a wedge member press-fitting tool for connecting a steel bar that can reduce the thickness of a portion that holds the steel bar and can reduce the weight.

  For example, Patent Document 1 is known as a wedge member press-fitting tool used for connecting a pair of steel bars inserted in parallel from left and right into a sleeve by press-fitting a wedge member from a hole portion of the sleeve. .

  In “Patent Steel Material Joining Method, Joining Bracket Holder and Joining Wedge Pin” of Patent Document 1, each rod to be joined to a holder attached to the tip of a muzzle of a low-speed gunpowder gun that gives a striking force to a built-in hammer. Positioning and holding an elliptical cylindrical joint fitting in which steel materials are stacked and inserted, each bar steel material is joined by driving a wedge pin between the steel bars through a hole of the joint fitting by a hammer of a low-speed gunpowder gun.

Japanese Patent Laid-Open No. 7-62868

  In the background art, the joining bracket is held by a single holding portion at the tip of the muzzle. For this reason, when the trigger of the low-speed gunpowder gun is operated and the wedge pin is driven between the steel bars from the hole of the joining metal fitting, all of the driving force is to act on the holding portion via the joining metal fitting. . In other words, all the support reaction force when driving the wedge pin has to be borne by one single holding portion.

  Therefore, the holding portion needs to be formed with high strength so as to withstand the driving force, and has a large thickness and a heavy weight. For this reason, the low-speed gunpowder gun is heavy.

  When connecting steel bars using a low-speed gunpowder gun, the worker can hold the joint fitting in the holding part at the tip of the muzzle, and so that the wedge pin can be driven straight into the hole of the joint fitting when driving the wedge pin. Takes a posture to hold a heavy low-speed gunpowder gun horizontally. However, in addition to the weight of the low-speed gunpowder gun itself, the holding part at the tip of the muzzle, which is the tip of the gun, is very heavy, so it is difficult to hold the tip of the muzzle easily so that it does not fall down. There was a problem of being inferior.

  Moreover, when it is necessary to connect the steel bars in a narrow space, for example, in the seismic reinforcement work in which reinforcing bars as steel bars are assembled along the outer peripheral surface of the existing RC casing and covered with concrete, When it is desired to make the gap between the reinforcing bars arranged on the surface as small as possible, the reinforcing bars are inserted into the joint fitting, so that the gap between the joint fitting and the surface of the RC housing is further narrowed.

  In the background art, the holding metal part is held by the holding part, and since the holding part is thick, the holding part is inserted between the joint metal part having only a slight gap and the surface of the RC housing. Is difficult, and there is a problem that the steel bars cannot be connected in a narrow space.

  The present invention was devised in view of the above-described conventional problems, and can reduce the thickness of the portion corresponding to the holding portion, and can also press down a wedge member press-fitting for a steel bar material that can reduce the weight. The purpose is to provide a tool.

  A wedge member press-fitting tool for connecting steel bars according to the present invention includes a press-fitting driver for press-fitting a wedge member between the steel bars from a hole formed in the sleeve in order to connect the steel bars arranged in parallel in the sleeve. A wedge member press-fitting tool for connecting a steel bar material, wherein the press-fitting driver is formed at an arm part extending toward the steel bar material inserted through the sleeve from the press-fitting driver, and a tip part of the arm part, It is provided with a pair of locking hooks that are detachably locked to the steel bar at both side positions of the sleeve and that support the bar steel with a reaction force acting on the press-fitting driver that press-fits the wedge member. Features.

  The locking hook is formed downward so as to be locked to the steel bar from above.

  The locking hook is formed in a groove shape that fits into at least one of the steel bars.

  The locking hooks are arranged at intervals that sandwich the sleeve from both longitudinal sides of the steel bar.

  In the wedge member press-fitting tool for connecting a steel bar according to the present invention, the thickness of the portion holding the steel bar can be reduced and the weight can be reduced.

It is the perspective view which looked down at suitable one Embodiment of the wedge member press-fitting tool for steel bar material connection concerning this invention from diagonally upward. It is the perspective view which looked up the attachment part of the wedge member press-fitting tool for bar steel materials connection shown in FIG. In FIG. 1, it is an A direction arrow directional view. It is the perspective view which looked up at the arm part which shows the modification of the wedge member press-fitting tool for steel bar connection concerning the present invention from the lower part.

  Hereinafter, a preferred embodiment of a wedge member press-fitting tool for connecting steel bars according to the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 shows a perspective view of the wedge member press-fitting tool 1 for connecting steel bars according to the present embodiment as viewed from obliquely above, and FIG. 2 shows a perspective view of the attachment portion as viewed from below. It is shown.

  The connection between the steel bars 2 such as rebars is formed in the sleeve 3 between the bars 2 by passing a pair of steel bars 2 through the sleeve 3 in a vertically parallel arrangement from both left and right sides as in the conventional case. This is done by press-fitting the wedge member 4 from the hole 3a. The wedge member 4 for connecting the bar steel members 2 in the sleeve 3 is press-fitted by the bar member connecting wedge member press-fitting tool 1.

  The steel rod connecting wedge member press-fitting tool 1 according to the present embodiment mainly includes a press-fitting driver 5 for press-fitting the wedge member 4 into the sleeve 3 through the hole 3a, and a metal fitting provided in the press-fitting driver 5. The arm portion 6 is composed of a pair of left and right locking hooks 7 formed on the arm portion 6.

  The press-fit driver 5 has a rod 8 that pushes the wedge member 4 attached thereto straight forward toward the sleeve 3, and a cylinder portion that hydraulically drives forward while guiding the rod 8 movably in the front-rear direction. 9, a pump 10 that generates hydraulic pressure in the cylinder unit 9, a motor 11 that drives the pump 10, an operation unit (not shown) that performs on / off operation of the motor 11, and a battery 12 for driving the motor.

  In the illustrated example, the case where the pump 10 and the motor 11 are incorporated in the press-fit driver 5 is shown. However, instead of the pump 10 and the motor 11, a hydraulic pump is used, and the cylinder portion of the hydraulic pump and the press-fit driver 5 is used. 9 may be connected with a hydraulic hose so that the hydraulic pump is separated.

  When the operation unit is turned on, the motor 11 activated by the power supply from the battery 12 drives the pump 10, and the pump 10 generates hydraulic pressure in the cylinder unit 9, and the rod 8 advances toward the sleeve 3 by this hydraulic pressure. . When the operation portion is turned off, the motor 11 and the pump 10 are stopped, whereby the hydraulic pressure of the cylinder portion 9 is lowered, and the rod 8 is moved back into the cylinder portion 9 by a return means (not shown) such as a spring. It is like that.

  In this embodiment, the cylinder part 9 provided with the rod 8 has a flange part 9a that is detachably attached by attaching and detaching the bolt 13, and is configured as a replaceable attachment. By making the rod 8 and the cylinder part 9 replaceable attachments, various dimensions are prepared according to the steel bar material 2 of various dimensions, the sleeve 3 of the corresponding dimension, and the hole 3a formed in the sleeve 3. It is possible to cope with the press-fitting work of the wedge member 4.

  The arm portion 6 extends from the left and right sides of the cylinder portion 9 constituting the press-fitting driver 5 toward the sleeve 3 positioned in front of the rod 8 and the steel bar 2 inserted through the sleeve 3 in a penetrating manner. A pair is provided. The arm portion 6 is provided with a base end portion 6 a integrally joined to the cylinder portion 9. The arm portion 6 may be detachably attached to the cylinder portion 9. The pair of arm portions 6 is disposed horizontally with the rod 8 sandwiched from both sides in the horizontal direction, and is provided horizontally along the forward / backward movement direction of the rod 8.

  A pair of left and right locking hooks 7 is formed at each of the distal end portions 6 b of each arm portion 6. Each locking hook 7 is detachably locked to the steel bar 2 at the left and right side positions of the sleeve 3. The pair of steel bars 2 inserted through the sleeve 3 in a penetrating state has their material end portions 2 a protruding from the sleeve 3. Of the pair of steel bars 2 arranged in parallel vertically, the dimension at which the material end 2a of the steel bar 2 positioned at least on the upper side protrudes from the sleeve 3 is a dimension capable of locking the locking hook 7. Is set.

  When the locking hook 7 of the arm portion 6 provided in the cylinder portion 9 is locked to the steel bar 2, the reaction force acting in the direction of pushing back the cylinder portion 9 when the wedge member 4 is press-fitted into the sleeve 3 by the rod 8, The reaction force is transmitted to the locking hook 7 via the arm portion 6 and can be supported by the steel bar 2. The locking hook 7 is integrally formed with the distal end portion 6 b of the arm portion 6. You may make it attach the latching hook 7 to the front-end | tip part 6b of the arm part 6 so that attachment or detachment is possible.

  The locking hook 7 is formed downward so that it can be locked to the steel bar 2 from above. Specifically, the locking hook 7 is formed in an upwardly extending portion 7a once extended upward from the distal end portion 6b of the arm portion 6, and is curved in a semicircular shape from the upwardly extending portion 7a to the front. Between the upwardly extending portion 7a and the downwardly extending portion 7c by the curved portion 7b and the downwardly extending portion 7c extending from the bending portion 7b so as to reach the lower side than the distal end portion 6b of the arm portion 6. It is formed in a substantially inverted J shape in the form of a groove that opens downward. Thereby, the latching hook 7 can be latched to the steel bar 2 detachably. However, each locking hook 7 may be simply bent downward from the tip 6b of the arm 6 and formed in an inverted L shape.

  Even if it is the locking hook 7 formed downward, it is possible to lock the locking hook 7 to the steel bar 2 from below, whereby the locking hook 7 is attached to the steel bar 2 from above. Even in construction sites that are difficult to lock, the steel bar 2 can be connected. In this case, of the pair of steel bars 2, at least the dimension at which the material end 2 a of the steel bar 2 positioned on the lower side protrudes from the sleeve 3 is set to a dimension capable of locking the locking hook 7. The

  In the present embodiment, since the arm portion 6 and the cylinder portion 9 including the locking hook 7 are configured as exchangeable attachments, the direction of the locking hook 7 is reversed from the downward direction to the upward direction, so that the stick It can be set as the latching hook 7 which can be latched to the steel material 2 from the downward direction.

  As shown in FIG. 3, the groove form of the locking hook 7 to which the steel bar 2 is locked is fitted to the steel bar 2 positioned at least on the upper side so as to surround it from above in the case of downward locking. Thus, the inner surface is set to abut against the steel bar 2. Preferably, the arm portion 6 is set so that the upward extending portion 7a of the locking hook 7 partially hangs on the steel bar 2 positioned on the lower side by increasing the thickness of the arm portion 6 or the like. Thereby, it is suppressed that the locking hook 7 moves freely around the steel bar 2. Specifically, the inner diameter of the groove-shaped portion is set slightly larger than the outer diameter dimension of the steel bar 2. In short, various types of locking hooks 7 are prepared corresponding to the outer diameter of the steel bar 2.

  The pair of left and right locking hooks 7 are arranged at intervals to hold the sleeve 3 by sandwiching the sleeve 3 from both ends in the length direction of the steel bar 2. That is, the dimension between the locking hooks 7 is set to be slightly longer than the length dimension of the sleeve 3. Therefore, various locking hooks 7 are prepared corresponding to the length of the sleeve 3. However, the spacing between the locking hooks 7 may be set wider than the length of the sleeve 3 and a spacer may be interposed between the locking hook 7 and the sleeve 3 to provide versatility. .

  Next, the operation of the steel bar connecting wedge member press-fitting tool 1 according to this embodiment will be described. When the steel bar members 2 are connected to each other with the wedge member press-fitting tool 1, as a preparation, the pair of bar members 2 are inserted in a penetrating state from the left and right sides of the sleeve 3 in a vertically parallel arrangement. At this time, it is preferable to support the pair of steel bars 2 at any location. In this way, subsequent operations can be performed without supporting the weight of the steel bar 2.

  When the bar steel material 2 is inserted into the sleeve 3 and the press-fitting preparation is completed, the locking hook 7 of the wedge member press-fitting tool 1 is locked to the upper bar steel material 2 from above in such a manner as to sandwich the sleeve 3. At this time, the operator moves the wedge member press-fitting tool 1 up and down around the steel bar 2 that has locked the locking hook 7 so that the rod 8 of the cylinder portion 9 faces the hole 3a of the sleeve 3. And keep it level.

  Next, the wedge member 4 is attached to the tip of the rod 8 so as to face the hole 3 a of the sleeve 3. Thereafter, the operating portion of the wedge member press-fitting tool 1 is turned on, the rod 8 is advanced, and the wedge member 4 is pushed into the sleeve 3 through the hole 3a and press-fitted between the steel bars 2.

  When the wedge member 4 is press-fitted, a reaction force acts on the cylinder portion 9 via the rod 8 in a direction to push it back. This reaction force is transmitted to the locking hook 7 via the arm portion 6. , And supported by the steel bar 2 with the locking hook 7 locked. As a result, the wedge member 4 can be continuously press-fitted with the rod 8, and the steel bars 2 can be connected to each other within the sleeve 3.

  When the press-fitting operation is completed, the operation unit is turned off and the rod 8 is moved backward. By moving the rod 8 backward, the locking hook 7 can be detached from the steel bar 2 and the wedge member press-fitting tool 1 is removed.

  In the wedge member press-fitting tool 1 for connecting steel bars according to the present embodiment described above, since a pair of the locking hooks 7 is formed, it is transmitted to the locking hook 7 as compared with a case where the locking hooks are single. The reaction force at the time of press-fitting can be dispersed and halved, whereby the thickness of the locking hook 7 can be reduced and the weight thereof can be reduced.

  Since the weight of the locking hook 7 can be reduced, the weight of the wedge member press-fitting tool 1 itself can be reduced, and the wedge member press-fitting tool can be reduced by the weight of the locking hook 7 when an operator performs work. Inconveniences such as the tip of 1 being easily lowered and needing to be held so as not to be lowered can be solved, and the work can be smoothly performed with smooth handling.

  Further, since the locking hook 7 itself can be thinned, for example, even if it is a construction place in a narrow space where the surface of the RC housing and the steel bar 2 compete with a small gap, the locking hook 7 that has been thinned. Can be installed.

  Further, since the locking hook 7 is locked not to the sleeve 3 but to the steel bar 2, for example, even when the RC housing and the sleeve 3 compete with each other with a slight gap, the bar steel with a sufficient clearance is provided. The locking hook 7 can be locked to 2 and the work can be advanced, and the workability can be further improved.

  Since the locking hook 7 is formed downward on the steel bar 2 so that it can be locked from above, the wedge member press-fitting tool 1 including the locking hook 7 by locking the locking hook 7 to the steel bar 2. It is possible to leave a part of the total weight in the steel bar material 2, and by leaving the weight in the steel bar material 2 in this way, the direction and posture of the wedge member press-fitting tool 1 can be lightly stabilized. Thus, the operability of the wedge member press-fitting tool 1 can be improved. Further, since the orientation and posture of the wedge member press-fitting tool 1 can be easily adjusted, the rod 8 and the wedge member 4 can be easily aligned with the hole 3a of the sleeve 3.

  Since the groove form of the locking hook 7 is formed so as to be fitted to the steel bar material 2, as shown in FIG. 3, the locking hook 7 can be brought into contact so as to surround the bar steel material 2, The locking hook 7 can be freely displaced with respect to the steel bar 2 (indicated by an arrow Q in the figure), or the steel bar 2 is displaced with respect to the locking hook 7 and the sleeve 3 is inclined obliquely ( (Indicated by an arrow R in the figure), and the position of the locking hook 7 and the steel bar 2 is difficult to be displaced as described above, so that the alignment operation between the rod 8 and the hole 3a of the sleeve 3 can be performed. It can be performed accurately and smoothly.

  Since the locking hooks 7 are arranged at intervals that sandwich the sleeve 3 from both lengthwise sides of the steel bar 2, by locking the locking hook 7 to the bar steel 2 on both sides of the sleeve 3, The positioning operation of the rod 8 of the cylinder portion 9 with respect to the hole portion 3a of the sleeve 3 can be performed accurately and smoothly, and the construction workability can be improved.

  Since the left and right arm portions 6 are provided, the reaction force borne by each arm portion 6 can be reduced, and the arm portion 6 can be reduced in thickness and weight. Further, by providing the arm portion 6 integrally with the cylinder portion 8, the reaction force acting on the cylinder portion 9 can be transmitted to the locking hook 7 with a rigid structure.

  By providing the pair of arm portions 6 horizontally along the longitudinal movement direction of the rod 8 and sandwiching the rod 8 from both sides in the horizontal direction, the cylinder portion 9 is disposed along the rod 8 into which the wedge member 4 is press-fitted. It is possible to transmit the reaction force acting on the locking hook 7 as it is, and to allow the locking hook 7 to appropriately support the reaction force. Since the locking hook 7 is formed integrally with the distal end portion 6b of the arm portion 6, it can be locked to the bar steel material 2 with a rigid structure, and the reaction force acting on the cylinder portion 9 is reliably supported by the bar steel material 2. be able to.

  FIG. 4 shows a modification of the above embodiment. In the above embodiment, the case where the cylinder portion 9 is provided with the pair of left and right arms 6 on which the pair of left and right locking hooks 7 are formed has been described. However, the proximal end 6a side is integrated and the distal end 6b side is bifurcated. A single arm portion 6 having a branched Y-shape may be provided in the cylinder portion 9. In this case, the thickness of the single arm portion 6 is set to be thicker than that of the pair of arm portions 6. Even in such a modification, it is needless to say that the same operational effects as those of the above-described embodiment are exhibited.

  In the above-described embodiment, the case where the steel bar 2 is inserted into the sleeve 3 in a vertically parallel arrangement has been described. However, the steel bar 2 may be arranged in a horizontal parallel, and in this case, “Upper and lower” may be read as “left and right”. Further, the driving method of the press-fit driver 5 is not limited to the battery 12 and may be a cord type that feeds commercial power.

DESCRIPTION OF SYMBOLS 1 Wedge member press-fit tool for steel bar material connection 2 Steel bar material 3 Sleeve 3a Hole part 4 Wedge member 5 Press-fit driver 6 Arm part 6b End part of arm part 7 Locking hook

Claims (4)

A wedge member press-fitting tool for connecting a steel bar member having a press-fitting driver for press-fitting a wedge member between these bar steel members from a hole formed in the sleeve in order to connect the steel bars arranged in parallel with each other,
The press-fit driver is formed at the tip of the arm part extending toward the steel bar inserted from the sleeve, and is detachable from the steel bar at both side positions of the sleeve. A wedge member press-fitting tool for connecting a steel bar material, comprising a pair of locking hooks that are supported by the steel bar and that support the reaction force acting on the press-fitting driver that press-fits the wedge member.   2. The wedge member press-fitting tool for connecting a steel bar material according to claim 1, wherein the locking hook is formed downward to be able to be locked to the steel bar material from above.   3. The wedge member press-fitting tool for connecting a steel bar material according to claim 1, wherein the locking hook is formed in a groove shape that fits into at least one of the steel bars.   The wedge member press-fitting for a steel bar material connection according to any one of claims 1 to 3, wherein the locking hooks are arranged at intervals that sandwich the sleeve from both sides in the lengthwise direction of the steel bar material. tool.

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