JP3795958B2 - Automatic nut tightening device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rod-like member having a thread that is widely used in a wide range of fields and a nut that is screwed to the rod-like member, and in particular, it is necessary to maintain a contact state with the nut. The present invention relates to an automatic nut tightening device that can automatically perform tightening of a nut following the movement of a contact object.
[0002]
[Prior art]
In recent years, a rod-like member having a thread and a nut screwed to the member have come to be used for various uses other than the original use over a wide range of fields, for example, in the fields of civil engineering and architecture. Is used in a sliding formwork apparatus in which a PC screw conceal having a screw thread and a nut screwed into the PC screw con- struction are used in the construction of a concrete structure such as a bridge pier.
[0003]
That is, as shown in FIG. 5, the formwork device frame 102 surrounding the pier 101 is horizontally fixed on the top of the reaction column 103 suspended from the center of the pier 101 prior to the construction of the pier 101. The lifting jack device 106, which is integrally formed with the formwork device frame 102, is suspended by a plurality of PC steel strands 105 suspended from the reaction force frame 104, and the lifting jack device 106 is A lift (slide) operation is performed by the operation.
[0004]
In this case, since the formwork apparatus frame 102 is suspended only by a plurality of PC steel wires 105, the formwork apparatus frame 102 is placed at a place where the PC steel wires 105 are kinked or the like. If the load is concentrated, there is a possibility that the wire 105 will be cut from the PC steel, and if it is cut, not only will it have a serious effect such as damaging the formwork device frame 102, but it will also ensure the safety of the operator. It becomes difficult.
[0005]
For this reason, conventionally, a PC screw connector 107 having a thread that can withstand the load of the formwork apparatus frame 102 when the wire is cut from the PC steel is disposed on the side of the PC steel wire 105 to react. In addition to being suspended from the gantry 104, a nut 108 is screwed into the PC screw con 107 and the upper surface thereof is brought into contact with the formwork device frame 102, so that the case where the wire 105 is cut from the PC steel should be prepared.
[0006]
However, when the formwork device frame 102 is raised in the case of setup change, the worker cannot be placed on the temporary scaffold 109 from the viewpoint of ensuring the safety of the worker. Not only can the upper surface of the nut 108 not be brought into contact with the formwork device frame 102 to follow, and a situation in which it is practically impossible to prepare for the cutting of the wire 105 from the PC steel will occur. The situation will occur during the most dangerous time period when the formwork frame 102 is rising.
[0007]
[Problems to be solved by the invention]
Therefore, the present invention has been made in view of the above-described problems, and when the contact state between the contact object and the nut is required to be maintained, the operator needs An object of the present invention is to obtain an automatic nut tightening device that can quickly tighten a nut by following the movement of an abutting object without touching or without monitoring by an operator.
[0008]
[Means for Solving the Problems]
That is, as shown in FIG. 1, the automatic nut tightening device according to the present invention includes a nut 2 that abuts from below on a contact object T that is screwed to a rod-like member 1 having a thread and is raised by a raising means. The driven pulley 3 that is integrated with the nut 2, the drive pulley 4 that is integrated with the contact object T, and the transmission belt 5 that is stretched between the driven pulley 3 and the drive pulley 4. And a rotational force applying means 6 for applying a rotational force to the nut 2 via the drive pulley 4, the transmission belt 5, and the driven pulley 3, and the rotational force by the rotational force applying means 6 is continuously applied to the nut 2. by applying, it is characterized in that the contact between the abutment target object T and the nut 2 to move upward is maintained.
[0009]
In addition, the rod-shaped member 1 not only maintains the contact state with the contact target T, but also maintains the contact state and supports the load of the contact target T. A screw capacitor is preferred.
[0010]
Further, the rotational force applying means 6 is a torque motor from the viewpoint that it is difficult to cause seizure even when the rotation of the motor is restricted when a motor is used as the rotational force applying means 6. Preferably there is.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. FIG. 2 is a schematic explanatory view showing a state in which an embodiment of an automatic nut tightening device according to the present invention is applied to a sliding formwork in a pier construction.
[0012]
In the figure, a formwork device frame 12 disposed facing the side of the pier 11 is fixed horizontally on the top of a reaction force column (not shown) suspended prior to the construction of the pier 11. A wire 14 is suspended from a PC steel, the upper end of which is fixed by a fixing tool 14a, on a reaction force frame 13 including a beam steel 13a provided and a work scaffold 13b and a handrail 13c provided on the beam steel 13a. Above, the PC steel wire 14 is suspended through a lifting jack device 15 integrally formed with the formwork device frame 12.
[0013]
Further, as a safety measure, the formwork apparatus frame 12 in this embodiment is provided with a PC screw con 16 having a thread that can withstand the load of the formwork apparatus frame 12 in case the wire 14 is cut from the PC steel. It is arranged on the side of the steel strand 14, and its upper end is fixed to the reaction force frame 13 by a fixing tool 16a and suspended, and a nut automatic tightening device is formed below the formwork device frame 12 of the PC screw con 16 By arranging 17, the formwork device frame 12 is abutted and supported.
[0014]
In this embodiment, the formwork device frame 12 is composed of a steel material having a function of fixing the formwork, which is integrally provided in the vertical and horizontal directions, and a work scaffold. Specifically, the formwork device frame 12 is arranged on the pier 11 side. A vertical member 21, a vertical member 22 arranged on the opposite side of the pier 11, and horizontal members 23, 24, 25, 26 straddling between the vertical members 21, 22. The horizontal member 23 is provided with a first-floor temporary scaffold 23a, the horizontal member 24 is provided with a second-floor temporary scaffold 24a, and the horizontal member 25 is provided with a third-floor temporary scaffold 25a. Form setting work is performed.
[0015]
In addition, in the field of this embodiment, from the viewpoint of ensuring the safety of the worker, when the formwork device frame 12 is raised at the time of setup change, the worker is placed on the temporary scaffolds 23a, 23b, 23c. Is not allowed.
[0016]
Further, the groove steel 27 is fixed to the lower surface of the horizontal member 26 in a positional relationship orthogonal to the horizontal member 26, while the upper end of the side surface of the vertical member 21 on the side of the pier is near the height of the horizontal member 26. A groove steel 28 is fixed, and a support member 29 made of a pair of groove steel with a gap corresponding to the outer diameter of the PC steel strand 14 and the PC screw capacitor 16 is fixed to the groove steel 27, 28. Yes.
[0017]
Furthermore, in this embodiment, the lifting jack device 15 includes a prismatic upper jack main body 15a fixed to the lower surface of the support member 29, and a prismatic lower jack main body 15b connected to the prism member in a telescopic manner. The upper center hole jack 15c provided in the upper jack main body 15a and provided integrally therewith, and the lower center hole provided in the lower jack main body 15b and provided integrally therewith The upper jack main body 15a and the lower jack main body 15b are vertically expanded and contracted to perform a jacking operation.
[0018]
Furthermore, an upper mold jack 30 and a lower mold jack 31 are fixed on the upper and lower sides of the vertical member 21 on the second floor portion of the mold apparatus frame 12, and the upper mold jack 30 and the lower mold jack are fixed. A mold 32 having a height corresponding to the construction amount is fixed to the tip of 31 on the pier 11 side.
[0019]
Also, a stopper hydraulic jack 33 that secures an appropriate distance between the formwork device frame 12 and the pier 11 is fixed to the lower part of the vertical member 21 on the first floor portion of the formwork device frame 12. A hydraulic unit 34 for supplying hydraulic pressure to the stopper hydraulic jack 33 is placed on 23a.
[0020]
The formwork apparatus frame 12 configured as described above allows the suspended wire 14 of the PC steel to pass through the gap of the grooved steel constituting the support member 29 and the upper center hole jack in the lifting jack apparatus 15. The upper center hole jack 15c or the lower center hole jack 15d is gripped by passing through the center holes of the lower center hole jack 15d and the lower center hole jack 15d.
[0021]
In this embodiment, as shown in the longitudinal sectional view of FIG. 3 and the plan view of FIG. 4, the automatic nut tightening device 17 abuts on a receiving member 41 fixed on the lower surface of a pair of grooved steel support members 29. At the same time, a nut 42 screwed into the PC screw con 16, a driven pulley 43 configured integrally with the nut 42, a drive pulley 46 configured integrally with the support member 29 via the arm steel 44 and the pedestal 45, A toothed transmission belt 47 stretched between the driven pulley 43 and the drive pulley 46 and a torque motor 48 having a switch box 48a installed and fixed on the pedestal 45 are provided.
[0022]
The torque motor 48 surpasses wind and rain with a metal cover 49 from the viewpoint of a long life.
[0023]
Further, the belt tension adjusting device 50 having a bearing 50b that can be tightened with a bolt 50a with respect to a shaft 45b fixed below the plate member 45a projecting on the side surface of the pedestal 45 on the PC screw con 16 side is centered on the shaft 45b. It is configured to be rotatable.
[0024]
According to the belt tension adjusting device 50, the tension of the toothed transmission belt 47 can be easily adjusted by loosening the bolt 50a and rotating the belt tension adjusting device 50 itself to adjust the contact state with the toothed transmission belt 47. Can be adjusted.
[0025]
Next, in this embodiment, the operation of the nut automatic clamping device 17 when the formwork device frame 12 is raised will be described with reference to FIGS. 3 and 4.
[0026]
First, when the formwork device frame 12 is raised, when the switch (not shown) of the switch box 48a is turned on in advance, the torque motor 48 moves the drive pulley 46, the toothed transmission belt 47, and the follower with respect to the nut 42. The rotational force is applied via the pulley 43, but the nut 42 is tightened in contact with the receiving member 41 which has not yet moved, so that the rotational motion of the driven pulley 43 is restricted. The rotation of the torque motor 48 is constrained by the meshing force generated between the drive pulley 46 and the toothed transmission belt 47. In this case, the torque motor 48 has a feature that it is difficult to cause seizure even if the rotation is restricted. Therefore, there is no problem unless the time for the restriction is long.
[0027]
Next, when the raising of the mold apparatus frame 12 is started and the receiving member 41 is raised, the nut 42 that has been tightened in contact with the receiving member 41 is loosened with the receiving member 41. As soon as the gap between the nut 42 and the receiving member 41 is about to open, the constrained nut 42 is free to rotate, and the nut 42 is rotated by the torque motor 48.
[0028]
At this time, the rotational motion of the nut 42 by the torque motor 48 is set to a rotational speed that does not lose the ascending speed of the mold apparatus frame 12. As a result, the nut 42 rotates and follows the rise of the receiving member 41. As a result, the contact state between the receiving member 41 and the nut 42 is maintained.
[0029]
In this embodiment, since the lifting jack device 15 is used as the lifting means of the formwork device frame 12, so-called shrinkage that draws the lower jack body 15b toward the upper jack body 15a when performing the lifting work. The mold apparatus frame 12 is raised and stopped at the time of the process. Even in this case, the characteristics of the torque motor 48 that does not easily cause seizure are exhibited sufficiently.
[0030]
【The invention's effect】
As described above, according to the present invention, a nut that is screwed into a rod-like member having a thread and simultaneously abutted against a contact object, a driven pulley that is integral with the nut, and a contact object are integrated. A drive pulley, a transmission belt stretched between these pulleys, and a rotational force applying means for applying a rotational force to the nut via the pulley and the transmission belt, and continuously rotating the nut Since the contact state between the contact object and the nut that moves by applying force is maintained, the contact object can be touched without the operator touching or monitoring the operator. The nut can be quickly tightened following the movement of the object.
[0031]
In addition, if a PC screw capacitor is used as the rod-shaped member, not only the contact state with the contact object is maintained, but also the contact state is maintained and the load of the contact object is supported. can do.
[0032]
Furthermore, if a torque motor is used as the rotational force applying means, even if the rotation of the motor is restricted during operation of the motor, it is possible to effectively avoid a situation in which the motor will seize unless restricted for a long time. Can do.
[Brief description of the drawings]
FIG. 1 is a schematic diagram showing a basic configuration of an automatic nut tightening device according to the present invention.
FIG. 2 is an explanatory view showing a state in which an embodiment of the automatic nut tightening device of the present invention is applied to a sliding formwork in pier construction.
FIG. 3 is a longitudinal sectional view showing an automatic nut tightening device according to an embodiment of the present invention.
FIG. 4 is a plan view showing an automatic nut tightening device according to an embodiment of the present invention.
FIG. 5 is a schematic explanatory view showing a construction method by a sliding formwork in a conventional pier construction.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Rod-shaped member 2 ... Nut 3 ... Drive pulley 4 ... Drive pulley 5 ... Transmission belt 6 ... Rotating force provision means 11 ... Pier 12 ... Formwork apparatus frame 13 ... Reaction force frame 14 ... PC steel strand 15 ... Lifting jack Device 16 ... PC screw connector 17 ... Nut automatic tightening device 21 ... Vertical member 22 ... Vertical member 23 ... Horizontal member 23a ... Temporary scaffold 24 ... Horizontal member 24a ... Temporary scaffold 25 ... Horizontal member 25a ... Temporary scaffold 26 ... Horizontal member 27 ... Groove Mold steel 28 ... Groove mold steel 29 ... Support member 30 ... Upper mold jack 31 ... Lower mold jack 32 ... Mold 33 ... Stopper hydraulic jack 34 ... Hydraulic unit 41 ... Receiving member 42 ... Nut 43 ... Following pulley 44 ... Arm steel 45 ... pedestal 45a ... plate member 45b ... shaft 46 ... drive pulley 47 ... toothed transmission belt 48 ... torque motor 48a ... Switch box 49 ... Cover 50 ... Belt tension adjusting device 50a ... Bolt 50b ... Bearing 101 ... Abutment 102 ... Formwork device frame 103 ... Reaction force column 104 ... Reaction force frame 105 ... PC steel strand 106 ... Lifting jack device 107 ... PC Screwcon 108 ... Nut 109 ... Temporary scaffold T ... Contact object

Claims (2)

A nut (2) that abuts from below on a contact object (T) that is screwed into a rod-like member (1) having a thread and that is lifted by a lifting means ;
A driven pulley (3) configured integrally with the nut (2);
A drive pulley (4) configured integrally with the contact object (T);
A transmission belt (5) stretched between the driven pulley (3) and the drive pulley (4);
A rotational force applying means (6) for applying a rotational force to the nut (2) via the drive pulley (4), the transmission belt (5) and the driven pulley (3);
By continuously applied to the nut (2) a rotational force by the rotational force applying means (6), that the contact state of the contact object rises (T) and the nut (2) is maintained Nut automatic tightening device. The automatic nut tightening device according to claim 1, wherein the rotational force applying means (6) is a torque motor.

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