JPH0578815U - Fixing nut washer rotation jig for PC steel rod - Google Patents

Abstract

(57) [Summary] (Corrected) [Purpose] The purpose is to obtain a jig for rotating the fixing nut washer screwed to the end of the PC steel rod of prestressed concrete. [Composition] A wrench member 18 detachably attached to a fixing nut washer 16 screwed to a PC steel rod 12,
The wrench member 18 is provided with a tubular body 20 connected thereto, and at the end thereof, a rectangular sleeve 22 for rotating operation is provided. The rotating jig 10 is preliminarily mounted together with the fixing nut washer 16 screwed to the PC steel rod 12, and the fixing nut washer 16 of the PC steel rod 12 held in tension is tightened by rotating the square sleeve 22. Therefore, even if it is a narrow part where reinforcing bars intersect, PC steel bar 1
The fixing work of No. 2 can be performed reliably and easily.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a jig for rotating a fixing nut washer screwed to a PC steel rod tip of prestressed concrete.

[0002]

[Problems to be solved by conventional techniques and devices]

 Conventionally, when prestressing a concrete structural member with a PC steel rod, the tension end portion of the PC steel rod is called a casting together with a frame member that functions as a spacer on the tension end side before placing concrete. The pressure member is temporarily fixed to the penetrating portion of the PC steel rod, and after the concrete is hardened, the fixing nut washer is tightened to the pressure bearing member in a state where the PC steel rod is tensioned. The structure is such that concrete is supported through the material.

By the way, in the case of a cantilever type column head having a ramen structure, the rebar coming from the column base and the PC steel rod tightening in the transverse direction are close to each other and the frame member and the column functioning as a spacer. Since the reinforcing bars on the leg side often intersect with each other, it is difficult to fold the reinforcing bars that interfere with the setting of the frame members, and it is also difficult to fold the reinforcing bars when placing the PC steel bar near the floor plate. Unfavorable measures such as cutting and removing are also taken.

[0006] Furthermore, in such a narrow portion where reinforcing bars and the like intersect, the work of tightening the fixing nut washer to the bearing member in a state where the PC steel rod is tightened becomes complicated, and therefore the efficiency of the fixing work decreases. Problems that should be solved were pointed out.

[0005]

[Means for Solving the Problems]

 Therefore, in this invention, a wrench member that is detachably attached to a fixing nut washer that is screwed into a PC steel rod is formed, and a cylindrical body is connected to this wrench member, and at the end of the cylindrical body. By using a rotating jig that is equipped with a rectangular sleeve for rotating operation, the fixing nut washer can be easily tightened on a PC steel rod in a tight state even in a narrow area to facilitate fixing work. It is intended to improve efficiency.

[0006]

[Work]

 In the present invention, a rotating jig including a wrench member is previously attached to a fixing nut washer screwed to a PC steel rod, and the rectangular sleeve is rotated by a jack device while the PC steel rod is tensioned. The fixing nut washer is fastened to the bearing member via the strip and the wrench member.

[0007]

【Example】

 Next, a preferred embodiment of a rotating jig according to the present invention will be described in detail below with reference to the accompanying drawings.

In FIG. 1, a turning jig 10 according to the present invention includes a box wrench portion 18 which is detachably attached to a fixing nut washer 16 screwed into a screw groove 14 of a PC steel rod 12. A tubular body 20 having a diameter that allows the PC steel rod 12 (and the tension rod) to be inserted into the box wrench portion 18 is continuously provided, for example, by means such as welding, and further, at the end of the tubular body 20. It is configured by fixing the operation rectangular sleeve 22.

Next, the procedure for tightening the fixing nut washer to the PC steel rod using the rotating jig 10 according to the present invention having the above-described structure will be described.

That is, as shown in FIG. 2, the cantilever type column head is exposed with the reinforcing bars A and A coming up from the column base, and the PC steel bar 12 transversely tightened between the reinforcing bars A and A is exposed. Assuming the case of arranging, the sheath 24 for inserting the PC steel rod 12 is connected to the casting 28 as a pressure bearing member through the joint 26 before the concrete B on the pillar head is placed. The casting 28 is connected and positioned at a predetermined position in the vicinity of the space between the reinforcing bars A, A, and a sheath member 30 as a spacer made of, for example, rubber or synthetic resin is arranged to dispose the PC steel rod 12 Temporarily fix it so that the box can be removed from the through part.

In this case, it goes without saying that a frame member 32 (shown by an imaginary line) may be used instead of the sheath member 30 depending on the distance between the reinforcing bars A and A.

Next, before the concrete of the pillar head is poured, the PC steel rod 12 is inserted into the sheath 24 and its fixed end (not shown) is fixed by a known means, and the tension end 12a shown in FIG. 2 is fixed. It is exposed to the penetrating portion side via the casting 28.

Then, after the concrete B has been cast and cured, the sheath member 30 is removed, and the fixing nut washer 16 is screwed into the thread groove 14 of the tensioned end 12 a, and the box wrench portion 18 is attached to the fixing nut washer 16. The rotating jig 10 is attached via the.

Next, after connecting the tension rod 34 to the tensioned end 12a, a hydraulic jack device 36 is mounted. At this time, the pressure bearing plate 38 is inserted between the concrete B and the jack device 36, and the rectangular sleeve 22 of the turning jig 10 is attached to the socket wrench 40 of the jack device 36.

Next, a hydraulic mechanism (not shown) is operated to gradually increase the pressure of the hydraulic mechanism, and when the elongation measurement value of the PC steel rod 12 which is tensioned via the tension rod 34 reaches a predetermined value, the hydraulic mechanism is Stop and rotate the rectangular sleeve 22 attached to the socket wrench 40 with the ratchet lever 42 attached to the jack device 36 to tighten the fixing nut washer 16 via the tubular body 20 and the box wrench portion 18. After attaching, the tension of the PC steel rod 12 by the jack device 36 is released. Finally, the tension rod 34 and the rotating jig 10 may be removed, and the void formed by the sheath member 30 may be filled with concrete or mortar.

[0016]

[Effect of the device]

 As described above, according to the turning jig of the present invention, the reinforcing bar does not get in the way even in a narrow space where the reinforcing bars and the like intersect, and therefore, such reinforcing bars can be bent or cut and removed. It is not necessary to do so, and the work of tightening the fixing nut washer to the bearing member can be performed easily and reliably when the PC steel rod is under tension, so that the work of fixing the PC steel rod can be made more efficient. And its practical effect is extremely large.

Although the preferred embodiment of the fixing nut washer rotating jig according to the present invention has been described above, the present invention is not limited to this embodiment and is within a range not departing from the spirit of the present invention. Of course, various modifications can be made.

[Brief description of drawings]

FIG. 1 is a partial sectional side view showing a preferred embodiment of a fixing nut washer rotating jig according to the present invention.

FIG. 2 shows the relationship between the PC steel rod, the fixing nut washer rotating jig, and the jack device when the fixing nut washer is tightened to the PC steel rod that has been tensioned using the fixing nut washer rotating jig shown in FIG. It is a partial cross section explanatory drawing shown.

[Explanation of symbols]

10 Rotating Jig, 12 PC Steel Rod, 14 Screw Groove, 16 Fixing Nut Washer, 18 Box Wrench, 20 Cylindrical Body, 22 Square Sleeve, 24 Sheath, 26 Joint, 28 Casting, 30 Sheath Member, 32 Frame Member , 34 Tension rod, 36
Jack device, 38 bearing plate, 40 socket wrench, 42 ratchet lever,

Claims (1)

[Scope of utility model registration request] 1. A fixing nut washer which is screwed onto a tip end of a PC steel rod arranged before placing concrete so that the tension force of the PC steel rod is supported by the concrete through a bearing member. A jig for connecting a cylindrical body to a wrench member detachably attached to the fixing nut washer, and a rectangular sleeve for rotating operation is provided at an end of the cylindrical body. Fixing nut washer rotation jig for PC steel rod.