JPH07110474B2 - Nut tightening device for PC steel rod tension fixing of PC structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a PC steel rod tension of a PC structure used in combination with a PC steel rod tensioning device when a PC steel rod of a PC structure is tension-fixed. The present invention relates to a fixing nut tightening device.

(Prior Art) Conventionally, when fixing a PC steel rod of a PC structure under tension, it was performed as shown in FIG. That is, with the anchor plate 3 and the washer 4 fitted in the protruding portion of the PC steel rod 2 protruding from the PC structure 1, the nut 5 is screwed and tightened. Press the ram chair 6 to the anchor plate 3,
The tension rod 7 passed through the ram chair 6 is connected to the tip of the PC steel rod 2 by a coupler 8. Lamb chair 6
The tension jack 7 protruding from the hydraulic jack 9 is fitted to the tension rod 7. Activate the hydraulic jack 9,
The PC steel rod 2 is pulled through the tension rod 7. The loosened nut 5 is tightened for fixing, but since the space inside the ram chair 6 is small, conventionally, fixing work was performed by hitting the chisel 11 with a hammer (not shown) and tightening the nut 5. .

(Problems to be Solved by the Invention) However, the fixing work using the chisel 11 and the hammer as described above is troublesome and troublesome, and it is dangerous because the hand is put near the nut 5. Also, there are hydraulic jacks 9 that have a tightening device built in, but because the diameter must be paid in due to the diameter of the PC steel rod 2, the weight will be heavy, and the work at the site will be a heavy labor problem. was there.

It is an object of the present invention to provide a nut tightening device for PC steel rod tension fixing, which enables nuts to be tightened easily and without danger.

(Means for Achieving the Object) The feature of the PC steel rod tension fixing nut tightening device of the PC structure of the present invention for achieving the above-mentioned object is that the penetrated PC steel rod tension fixing nut fitting hole And a second gear having a penetrating PC steel rod tension fixing nut fitting hole having a size different from that of the fitting hole of the first gear, and the first and second gears. A frame for rotatably supporting in a state of being intermeshed with each other, a ram chair locking portion for locking and supporting a PC steel rod tension ram chair attached to the frame, and the first and second One of the half halves is removably fitted into one of the nut fitting holes of the gear, the other is removably fitted into the remaining nut fitting holes, and the gear is turned around the shaft center. It consists of a gear turning block with a through hole that can be fitted with a tool for

(Operation) The nut tightening device fits the first gear to the nut of the PC steel rod using the nut fitting hole before mounting the ram chair.

In this state, a tensioning device consisting of a ram chair, a tensioning rod and a hydraulic jack is attached and the PC steel rod is tensioned. Thus, when the nut comes loose, the second gear of the nut tightening device is rotated to rotate the first gear and tighten the nut. In this case, since the second gear is out of the ram chair, the work of rotating the second gear can be easily performed.

If the second gear also has a nut fitting hole of a size different from that of the nut fitting hole of the first gear, if the nut size of the PC steel rod is different, turn the nut tightening device upside down. By using the nut fitting hole of the second gear, it is possible to fit the second gear to the nut of the PC steel rod and accommodate the difference in nut size. At that time, it is necessary to replace the tool used for turning the gear, but it is not necessary to replace the tool by using the gear turning block.
That is, one half of the gear turning block corresponds to the diameter of the nut fitting holes of the first and second gears, respectively.
Further, since the shaft center has a fitting hole for fitting the tool, it is possible to perform tightening with different nut sizes without changing the tool.

If a ramchair locking part that locks the PC steel rod tension ramchair is provided on the frame, the ramchair can be supported by this ramchair locking part, and the worker supports the ramchair by hand. There is no need.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIGS. 1 (A), (B), and (C) show an embodiment of a PC steel rod tension fixing nut tightening device 12 according to the present invention. The nut tightening device 12 has a frame 16 formed by connecting two parallel plates 13 with a countersunk bolt 15 via a spacer pipe 14. Below and above each plate 13, first and second gear support holes 17 and 18 are provided. Both ends of the first gear 19 in the axial direction are rotatably supported in the first gear support holes 17 of both plates 13. In the second gear support holes 18 of both plates 13, the first gear 19
Both ends in the axial direction of the second gear 20 that meshes with are rotatably supported. These first and second gears 19 and 20 are provided with nut fitting holes 21 and 22 of different sizes penetrating therethrough. In this embodiment, the lower nut fitting hole 21 is large,
The upper nut fitting hole 22 is formed smaller than that. Ramchair engaging portions 23 each formed of a groove are provided in the vertical center of both side surfaces of the frame 16.

FIGS. 2 (A) and 2 (B) show a gear turning block 24 which is fitted into one of the first and second gears 19 and 20 to turn the gears 19 and 20. The gear turning block 24 is
One half of the longitudinal direction is a hexagonal part 24a that matches the large nut fitting hole 21, and the other half of the longitudinal direction is a hexagonal part 24b that matches the small nut fitting hole 22. The length of each hexagonal portion 24a, 24b is approximately the length of the nut fitting holes 21, 22. Further, a rectangular ratchet spanner fitting hole 25 is provided through the axis of the gear turning block 24.

3 to 5 show an example of the PC steel rod tension ramchair 6 used in this embodiment. In the ramchair 6, an end plate 27 is fixed to one end in the longitudinal direction of a frame 26 having a U-shaped cross section, and the end plate 27 is provided with a tension rod through hole 28 and a hydraulic jack connecting hole 29. Is provided with a handle 30 on its upper surface, and both inner surfaces of the other end of the frame 26 are provided with a nut tightening device locking portion 31 formed of a ridge to be fitted to the ramchair locking portion 23 of the nut tightening device 12. It has a built structure.

Next, the tension fixing work of the PC steel rod 2 using such a nut tightening device 12 will be described with reference to FIG.

(B) Attach the anchor plate 3, washer 4 and nut 5 to the PC steel rod 2.

(B) Attach the nut tightening device 12 of this embodiment to the nut 5. That is, the nut tightening device 12 tightens the gear having the nut fitting hole that matches the size of the nut 5 to the nut 5. In this embodiment, the first gear 19 is fitted into the large-sized nut 5 using the large-sized nut fitting hole 21.

(C) The ramchair 6 is fitted with the nut tightening device locking part 31 consisting of its ridge in the ramchair locking part 23 consisting of the groove of the nut tightening device 12, and the ramchair 6 is fitted into the nut tightening device.
The ram chair 6 is pressed against the anchor plate 3 while being supported by 12, and the tension rod 7 is connected to the PC steel rod 2 by the coupler 8.

(D) The hydraulic jack 9 is fitted on the tension rod 7 and brought into contact with the ram chair 6, and the nut 10 is screwed onto the tension rod 7 and tightened.

(E) Operate the hydraulic jack 9 to pull the PC steel rod 2.

(F) The small-sized hexagonal portion 24b of the gear turning block 24 is fitted into the small-sized nut fitting hole 22 provided in the second gear 20 of the nut tightening device 12, and the rectangular shape of the gear turning block 24 is formed. Ratchet spanner Mating hole 25 to ratchet spanner 32
Fit the square fitting protrusion 32a of the ratchet spanner 32
The second gear 20 is rotated by the above operation, and the nut 5 is rotated by rotating the first gear 19 meshing with the second gear 20, thereby tightening.
In this way, the nut 5 in the narrow space in the ram chair 6 can be easily turned.

(D) When the size of the nut 5 is small in the PC steel rod 2 having a small diameter, the nut tightening device 12 is turned upside down, and the small size nut fitting hole 22 is used to make the nut 5 into the second gear 20.
Is fitted, and the second gear 20 is rotated by rotating the first gear 20 with the ratchet spanner 32, and the nut 5 is tightened.

In the above embodiment, the nut fitting holes are provided on both the first and second gears. However, in the case of a nut tightening device dedicated to a certain nut size, the nut fitting holes matching the nut size are provided. May be provided on either one of the gears. In this case, the wrench fitting hole can be provided in the shaft center of the gear without the nut fitting hole.

Further, in the above embodiment, the ramchair locking portion of the nut tightening device is concave, but it may be convex. In this case, the nut tightening device locking portion of the ram chair may be concave.

(Effects of the Invention) As described above, according to the PC steel rod tension fixing nut tightening device of the present invention, the following effects can be obtained.

Since the first gear and the second gear are rotatably supported in the state of being meshed with each other on the frame, and the first gear is provided with the nut fitting hole for locking the nut and fitting the nut, When the nut is fitted in the nut fitting hole of the first gear and the second gear is turned, the nut can be turned via the first gear. Further, the frame is provided with a ramchair locking portion for locking the PC steel rod tension ramchair, so that the ramchair can be supported by the PC steel rod tension fixing nut tightening device. As a result, there is an advantage that an operator does not have to support the ram chair and the nut can be tightened safely and efficiently.

Further, since the diameters of the nut fitting holes of the first and second gears are different, even if the nut sizes are different, it is possible to cope with them without trouble by appropriately selecting the above nut fitting holes. . At that time, by using the gear turning block, there is also an advantage that the nut can be tightened without changing the tool used for turning the gear.

[Brief description of drawings]

1 (A) is a front view of an embodiment of a nut tightening device according to the present invention, and FIG. 1 (B) is a vertical sectional view of FIG. 1 (A).
FIG. 1 (C) is a side view of FIG. 1 (A), and FIG. 2 (A).
(B) is a front view and a side view of a gear turning block used in this embodiment, FIGS. 3 and 4 are front views and a plan view of a ram chair used in this embodiment, and FIG. The left side view of FIG. 3 and FIG. 6 show the nut tightening device of this embodiment.
No. 7 side view of the longitudinal section of the main part showing the tension fixing work of the PC steel rod
The figure is a vertical sectional side view of a main part showing a tension fixing work state of a conventional PC steel rod. 1 ... PC structure, 2 ... PC steel rod, 3 ... Anchor plate, 4 ... Washer, 5 ... Nut, 6 ... Ramchair, 7 ... Tension rod, 8 ... Coupler, 9 ... Hydraulic jack, 10 ... Nut, 12 ... Nut tightening device, 13 ...
… Parallel plate, 14 …… Spacer pipe, 15 …… Counter bolt, 16 …… Frame, 17,18 …… First and second gear support holes, 19 …… First gear, 20 …… Second Gears, 21,22 ……
Nut fitting hole, 23 …… Ramchair locking part, 24 …… Gear turning block, 24a, 24b …… Hexagonal part, 25 …… Ratchet spanner fitting hole, 26 …… Frame, 27 …… End plate, 28 ...... Tension rod through hole, 29 …… Hydraulic jack connection hole, 30 …… Handle, 31 …… Nut tightening device locking part, 32 …… Ratchet spanner, 32a …… Mating protrusion.

Claims (1)

[Claims] 1. A first gear having a penetrating nut fitting hole for PC steel rod fixing, and a nut fitting for penetrating PC steel rod fixing anchor different in size from the fitting hole of the first gear. A second gear having a hole, a frame for rotatably supporting the first and second gears in mesh with each other, and a PC steel rod tension ramchair attached to the frame are locked. And a ramchair locking portion that is supported by one of the nut fitting holes of the first and second gears, one half of the half fitting is detachably fitted, and the other half is the remaining nut fitting. A nut tightening device for PC steel rod tension fixing, which comprises a gear turning block that is detachably fitted in a hole and has a fitting hole through which a tool for turning a gear can be fitted in the shaft center.