JPH09123151A - Bolt tightening and loosening device for concrete product formwork - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] A mold for molding concrete products that facilitates the handling of fastening and loosening tools and minimizes the impact force transmitted to the hands to improve the efficiency of fastening and loosening work and reduce the burden on workers. To provide a bolt tightening device. SOLUTION: A nut runner 14 which is a fastening tool is fixed to a support frame 13, and the support frame 13 is suspended by a balancer. A stopper pin 17 is provided at the lower end of one side of the support frame 13, and when tightening and loosening, the stopper pin 17 is moved while abutting against the end of the flange 2 of the form 1 so that the nut runner 14 can be positioned easily. Along with
The reaction force of the nut runner 14 generated during tightening is received by the flange 2 end via the stopper pin 17,
It is sufficient to support the nut runner 14 so that the nut runner 14 does not come off the nut 4 when tightening and tightening.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete product for tightening and tightening bolts and nuts for assembling a vertically separable mold used for centrifugal molding or casting of concrete products such as piles. The present invention relates to a bolt tightening / loosening device for a molding frame.

[0002]

2. Description of the Related Art A concrete product such as a pile having a long length is made by filling a cylindrical formwork with fresh concrete and rotating it by a centrifuge to centrifugally force the fresh concrete into a cylindrical shape.

[0003] The cylindrical mold is formed so as to be able to be divided into upper and lower parts, and bolts and nuts as fasteners are arranged at appropriate intervals on a flange provided around the mold, and the fastening bolt and nut are provided. Tightening and loosening nuts are performed when assembling and disassembling the formwork.

[0004] As a fastener for the tightening operation, an impact wrench for rotating a bolt and a nut by an impact force is generally used. In addition, although a fully automatic bolt tightening device incorporating a tightening tool is also provided, it is rarely used because it is expensive, and the impact wrench is suspended by a balancer and operated directly by hand. Many manual tightening devices that perform tightening work are still used.

[0005]

However, as described above, when the impact wrench is directly held in the hand for tightening and loosening work, the vibration of the impact wrench and its reaction force are directly transmitted to the hand and white wax disease or the like occurs. There is a high probability that occupational diseases will affect workers and there is a great demand for improvement of the working environment.

In view of the above points, the present invention softens the influence of vibration and its reaction force transmitted to the hand when performing the tightening / loosening work manually by using the tightening / loosening tool, thereby facilitating the tightening / loosening work. It is an object of the present invention to provide a bolt tightening / loosening device for a concrete product molding formwork, which realizes efficiency improvement and reduction of operator's burden.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a tightening and tightening means for tightening and tightening fastening bolts and nuts arranged on a flange of a vertically separable mold for molding concrete products. In a bolt tightening / loosening device for a concrete product molding frame in which a tool is suspended on a balancer, and the tightening / loosening tool is manually operated for tightening / loosening work, the tightening / loosening tool is fixed to a supporting frame, and the supporting frame is While hanging with a balancer,
Stoppers project downward on both sides of the fastening and loosening tool at one lower end of the support frame, and the stopper is brought into contact with the flange end of the form during fastening and positioning of the fastening and loosening tool is performed. It is characterized in that the reaction force at the time of tightening is received by contacting the flange end.

[0008]

According to the bolt tightening / loosening device of the present invention, at the time of bolt tightening / loosening of a mold, first, an operator lightly manually moves a support frame having a tightening / loosening tool suspended by a balancer, The fastening bolts and nuts arranged on the flange of the frame are made to substantially face the positions, and the stopper projecting from the lower end of one side of the supporting frame is brought into contact with the end of the flange. Then, the support frame is moved along the flange while the stopper is brought into contact with the end portion of the flange, and the fastener is fitted into the fastening nut. When the fastening / loosening tool is driven to perform the fastening / loosening work, the stopper comes into contact with the end of the flange by the reaction force generated by the rotation of the fastening / loosening tool and receives the reaction force. As a result, the worker does not need to directly receive the reaction force of the tightening / loosening tool with his / her hand, but can easily perform the tightening / loosening work manually by simply putting his / her hand on the support frame.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a side view of a tightening / loosening yard for tightening / loosening the fastening bolts 3 and nuts 4 arranged on the flange 2 of the form 1, and in the pit 5, a rail 6 laid on the bottom surface portion. A traveling carriage 8 having traveling wheels 7 is arranged on the top, and the traveling carriage 8 carries the mold 1 to convey the mold 1 to a predetermined position.

A platform 9 is provided on the side of the pit 5, and an inverted L-shaped support column 10 is erected on the platform 9, and the tip of the column 10 serves to cancel the weight of the hanging object. The balancer 11 is attached so that the hanging object can be manually handled.

A support frame 13 is suspended from the wire 12 of the balancer 11, and an electric or air-operated nut runner 14, which is a bolt / nut fastening device, is fixed to the support frame 13. A socket 15 for fitting the nut 4 is attached to the tip of the nut runner 14.

When the nut runner 14 is driven, the socket 15 freely rotates in the forward or reverse direction, and can be tightened or loosened while giving a shock to the fitted nut 4.

A base plate 16 disposed below the support frame 13.
A stopper pin 17 which serves as a stopper is projected downward from the lower end portion of one side, and the stopper pin 17 is located at a position apart from the center of the socket 15 by a predetermined distance.
It is projected one by one on the left and right.

The stopper pin 17 has two roles, one of which is to bring the socket 15 into contact with the end of the flange 2 of the mold 1 to accurately guide the socket 15 above the fastening nut 4 of the flange 2. For this reason, the distance between the stopper pin 17 and the center position of the socket 15 is, therefore, the flange 2
It is desirable that the distance be equal to the distance from the end to the center of the nut 4, but if there are molds of different sizes, they should be adjusted to the largest size of the applicable molds.

The second purpose of the stopper pin 17 is to allow the end of the flange 2 to receive the rotational force generated as a reaction force when the nut 4 is rotated by driving the nut runner 14, and the reaction force is Since the rotation direction is different between the forward rotation and the reverse rotation, it is necessary to dispose the stopper pin 17 in the left and right positions with the socket 15 in between.

As shown in FIG. 5, the stopper pin 17 may be formed by bending the end of the base plate 16 downward to form a stopper, or by fixing a stopper member to form a stopper. May be formed, nut runner 14
It is advisable to make various selections according to the size and the shape of the flange 2.

Reference numeral 18 denotes an operation lever fixed to the support frame 13 for moving the nut runner 14 so that an operator can fit the socket 15 of the nut runner 14 into the nut 4 of the flange 2 or separate them from each other. Yes, there is an elastic body at the mounting site and the nut runner 1
It is preferable to adopt a structure in which the vibration is hardly transmitted when the device 4 is driven.

When tightening bolts and nuts with the manual bolt tightening / loosening device of the present invention, the traveling carriage 8 moves on the traveling rails 6 and the formwork 1 moves to the platform 9.
When arriving before, the operator operates the operation lever 18 of the support frame 13 suspended by the balancer 11 to bring the nut runner 14 close to above the desired nut 4.

At this time, when the support frame 13 is brought close to above the desired nut 4, the support frame 13 is first lowered to support the support frame 1.
The stopper pin 17 protruding from 3 is brought into contact with the end of the flange 2 of the formwork 1. Then, as shown in FIG. 6, when the distance from the flange 2 end of the nut 4 is equal to the distance between the stopper pin 17 and the center of the socket 15, the stopper pin 17 is supported along the flange 2 end as shown by an arrow. By moving the frame 13, the socket 15 is moved above the desired nut 4.

Further, as shown in FIG. 7, the distance from the end of the flange 2 of the nut 4 depends on the stopper pin 17 and the socket 1.
When the distance is shorter than the center of 5, the support frame 13 is moved along the stopper pin 17 along the end of the flange 2 to move the socket 15 to the vicinity of the desired nut 4, and for example, the stopper pin on the right side of FIG. The socket 15 is moved to a desired position above the nut 4 by slightly turning about 17 as shown by an arrow.

By using the stopper pin 17 in this way, the nut runner 14 can be moved quickly and accurately above the desired nut 4 and the working efficiency can be improved.

When the socket 15 of the nut runner 14 is fitted into the desired nut 4, the rotating socket 15 tightens or loosens the nut 4. At this time, the nut 4 is tightened by turning it clockwise and loosened by turning it counterclockwise. Then, when turning clockwise, the left side of the stopper pin 17 in FIG. 8 is pressed against the end of the flange 2 as shown by the solid line to receive the reaction force at the time of tightening,
Further, when turning counterclockwise, the right side of the stopper pin 17 in FIG. 8 is pressed against the end of the flange 2 as indicated by the dotted line to receive the reaction force when loosening.

Therefore, when tightening and loosening, the nut runner 14
It is not necessary to directly hold and support the nut runner 14 by hand to counter the reaction force of the nut, and the tightening and loosening work can be performed only by lightly supporting the operation lever 18 attached to the support frame 13 so that the socket 15 does not come off the nut 4. The vibration and reaction force transmitted from the nut runner 14 to the hand can be softened.

[0025]

As described above, in the bolt tightening / loosening device for the concrete product molding frame according to the present invention, the support frame 13 to which the nut runner 14 is fixed is suspended by the balancer 9, and one of the support frame 13 is suspended. Nut runner 14 at the lower end of the side
Stopper pins 17 are projected downward at both side positions of the mold.
The nut runner 14 can be positioned by abutting against the end, and the reaction force at the time of tightening / loosening can be made to abut on the end of the flange 2 to be received. The operator can easily perform the tightening / loosening work manually by simply putting his / her hand on it without directly receiving the reaction force of the tightening / loosening tool with his / her hands. And the burden on the operator can be reduced.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a tightening and loosening yard employing a bolt tightening and loosening device of the present invention.

FIG. 2 is a front view showing an embodiment of a main part of the bolt tightening and tightening device of the present invention.

FIG. 3 is a side view of FIG. 2;

FIG. 4 is a plan view of FIG.

FIG. 5 is a front view corresponding to FIG. 2 showing another embodiment of the present invention.

FIG. 6 is an explanatory view showing a positioning method of the bolt tightening / loosening device of the present invention.

FIG. 7 is an explanatory view showing a positioning method of the bolt tightening / loosening device of the present invention.

FIG. 8 is an explanatory view showing the action of the stopper.

[Explanation of symbols]

1 ... Formwork 2 ... Flange 3 ... Bolt 4 ... Nut 11 ... Balancer 13 ... Supporting frame 14 ... Nutrunner (tightening / loosening tool) 17 ... Stopper pin (stopper)

Claims (1)

[Claims] 1. A tightening / loosening tool for tightening / loosening fastening bolts / nuts arranged on a flange of a vertically separable mold for molding a concrete product is hung on a balancer, and the tightening / loosening tool is manually operated. In a bolt tightening device for a concrete product molding frame that performs tightening and loosening work, the tightening and loosening tool is fixed to a support frame, the support frame is suspended by a balancer, and the lower end of one side of the support frame is tightened. Stoppers project downward on both sides of the loosening tool, and the stoppers can be brought into contact with the flange ends of the formwork during tightening to position the fastening and loosening tool.
A bolt tightening / loosening device for a concrete product molding formwork, characterized in that a reaction force during tightening / loosening is configured to be received by contacting the flange end.