JP3043946B2 - Prestressed concrete tendon bending tool - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a device up bending the tension member of prestressed concrete. For more information about bending up device having the configuration is supported by the lower peripheral surface of the shaft which rotates following the tendons thereto.

[0002]

Conventionally, as a tension member bent up instrument prestressed concrete, two rows of holes 17 at predetermined intervals in a plate 16 which is supported on the base (drawing omitted) by the mounting portion 15 as shown in FIG. 11, 17 and these holes 17 are shown in FIG.
3, two notches 1 at predetermined intervals on a plate 16 supported on a base (not shown) by a mounting portion 15 as shown in FIG.
9 and 19 are provided with a downward inclination, and the notch 19 is hung with a tension member 18. This is commonly called a hagita board and is widely used.

The above-mentioned tendon bending tool can be provided at a low cost because of its simple structure. However, the tendon which has been straightened is bent up as shown in FIG. 13 or shown in FIG. When the tendon is obliquely pulled and tensioned as described above, the tendon moves while receiving great resistance due to friction with the hole or the wall of the notch. This caused the tendon to be damaged
Ri, there is a problem that the plate bending up device is or bent.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and has a tension member received on a lower peripheral surface of a shaft which can rotate following the movement thereof. ,
Of the tendon bending so as not to cause friction between the bending-up device at the time of the increase, a safe tendon bending-up device that does not cause the bending of the damage and pillars of the tendon due to friction in a highly marketable price provide.

[0005]

SUMMARY OF THE INVENTION The present invention relates to a method for mounting a column on a base.
And establishing, the pillars lateral hole several consistent set necessary at predetermined intervals, an axis subjected to the tension member under the peripheral surface on both sides of the pillars on each lateral hole fitted rotatably, shaft Outside the tendon at both ends
Releases that are high enough to support the sides
The problem is solved by a configuration provided with a detachment prevention member .

[0006]

FIG. 7 shows a prestressed concrete tendon bending- up tool having the above-described structure, which is temporarily pulled on the lower peripheral surface of a shaft rotatably inserted into a lateral hole of a pillar established on a base. place and subjected to pulling tension the tendons which are directly strained as indicated by a chain line in the middle portion of FIG. 10 or when pulling as shown by the solid line, the Oite tendon obliquely on the left side of FIG. 10 When the tendon moves as shown by the arrow in FIG. 7, for example, the shaft receiving the tension on the lower peripheral surface follows the tendon and rotates as shown by the arrow in FIG.
Therefore, there is no friction between the shaft and the tendon, so that the tendon is smoothly and securely tensioned without damaging the tendon or bending the column. The detachment prevention member provided prevents the tendon from coming off to the outside.
It is high enough to support the tendon,
The tendon material is prevented from coming off the shaft, making tension work safe and secure
It is what is done.

[0007]

EXAMPLES be described with reference to the embodiment of the tendon bending up tool Prestressed Concrete according to the present invention accompanying drawings.

[0008] Figure 1 is a front view showing a first embodiment of a tendon bending up device of this prestressing concrete. FIG. 2 is a front view showing a second embodiment of the same. FIG. 3 is a front view showing a third embodiment of the present invention. FIG. 4 is a plan view of the first embodiment shown in FIG. FIG. 5 is a plan view of the second embodiment shown in FIG. FIG. 6 is a plan view of the third embodiment shown in FIG. FIG. 7 is a partial side view showing the function of the shaft in each embodiment, except for a member for preventing a tension member from being released.
FIG. 8 is a partial longitudinal front view showing a state where a shaft is attached to a pillar in the first embodiment and the second embodiment. FIG. 9 is a side view showing a state in which a device for preventing a tendon from coming off is attached to a shaft in the third embodiment. FIG. 10 is an explanatory diagram showing a use state of the tendon bending- up tool for prestressed concrete of the present invention.

[0009] Figure 1, in column 1 are bent up tool in the first embodiment shown in FIG. 4, used as a circular cross section as shown in FIG. 4, the male screw 2 is provided at its lower end, the base of this The female thread 4 of the base 3 is attached to the pedestal 3 and the female thread 4 of the pedestal 3 is screwed with a bolt 6 having a base 5 penetrated therethrough to establish the column 1 on the base 5. The pillar 1 has a required number of lateral holes 7 penetrating therethrough at predetermined intervals.

Reference numeral 8 denotes a shaft which is rotatably inserted into the required number of lateral holes 7 and receives a tension member to be described later at portions protruding from both sides of the column 1. The shaft 8 is shown in FIG. As shown, a flange as a detachment preventing member having a height sufficient to support the outside of the tension member 9 (PC steel wire, a combination of a plurality of PC steel wires, PC steel rod) at one end so as not to be detached. 10 is placed is attached by spot welding, in which the other end of through the shaft 8 in the transverse hole 7 of the column 1 to attach the collar 10 by spot welding, the tension member 9 under the peripheral surface of the shaft 8 Let me
When the tendon 9 is moved up as shown by the arrow in FIG. 7 when the tendon 9 is bent up , the shaft 8 rotates following the movement of the tendon 9 as shown by the arrow in FIG. The friction between the tendon 9 and the tension member 9 is prevented.

The column 1 in the second embodiment shown in FIGS. 2 and 5 has a rectangular cross section as shown in FIG. 5, and has a female screw 11 at its lower end.
The pedestal 3 and threadedly engaged with the bolt 6 which is through a base pillar 1
A required number of lateral holes 7 are provided at predetermined intervals in this pillar 1 at a predetermined interval, and the tension members 9 are detached from each lateral hole 7 by spot welding to one end similarly to the first embodiment. A shaft 8 to which a flange 10 as a prevention member is spot-welded is inserted, and the flange 10 is spot-welded to the other end. This shaft 8 also receives a tendon 9 on its lower peripheral surface in the same manner as in the first embodiment. When the movement occurs, the rotation is made to follow the movement, and the friction with the tendon 9 is prevented.

[0012] Figure 3, column 1 of the third embodiment shown in FIG. 6, are established on the base 5 by the same structure as in Example 1 to those of the circular cross section as shown in FIG. However, the structure of the detachment preventing member of the tension member 9 provided at both ends of the shaft 8 rotatably inserted into the lateral hole 7 penetrating through the column 1 is different. That is, the detachment prevention member shields the outside of all the shafts 8.
A plate 10 having a width and a length necessary for the above is used . At the upper and lower ends of the plate 10 , there are a portion A larger than the shaft 8 as shown in FIGS. Keyhole 1
Spaced 2 from wearing fitted as shown in Figure 9a a large portion b of the holes 12 to the shaft 8 of the upper and lower ends is formed longer than the other axis 8 as shown in FIG. 3, the plate 10 When the small part B of the hole 12 is pulled down and engaged with the groove 14 provided on the upper and lower shafts 8 as shown in FIG. 9B, the plate 10 is supported by the upper and lower shafts 8 so that Shield and tension material 9
In this embodiment, similarly to the embodiment shown in FIG. 1, when the shaft 8 receives the tension member 9 on the lower peripheral surface and the movement thereof occurs, the shaft 8 follows and rotates. No friction occurs between the tendon 9 and the tendon 9.

FIG. 10 is an explanatory view showing a use state of the tendon bending- up device according to the present invention, wherein columns 1 are established at predetermined intervals on a base 5 and shafts rotatably fitted to these columns 1. Below 8
After the tension member 9 is received on the peripheral surface , a tension is applied to the left end of the tension member 9 by a tension device (not shown) as shown by an arrow, and the tension member 9 is bent up. The intermediate portion is pulled up by the pulling means 14, and the tension member 9 is also bent up at this portion to form a prestressed concrete product.

[0014]

[Effect of the Invention] tendon bending up tool Prestressed Concrete according to the present invention as described above, the tension member from subjected under peripheral surface of the shaft fitted rotatably to the pillar, up bending of the tension member When the tendon moves, the shaft rotates following it and does not cause friction with the tendon, so that the tendon is smoothly and securely carried out without damaging it or bending the column. In addition, since the bending- up device is provided with a release prevention member having a height sufficient to support the outside of the tendon at the shaft end so as not to come off, the setting operation of hanging the tendon on the shaft is easy. It is performed so that the tendon does not come off the shaft during tensioning,
Separation prevention members have flanges individually at both ends of each shaft
Or a detachable plate attached across all axes.
Ri, liable to simple fabrication reached structure, and has a great effect that this can <br/> be provided market price again and again close up bending called battledore.

[Brief description of the drawings]

FIG. 1 is a front view showing a first embodiment of a tendon bending tool for prestressed concrete according to the present invention.

FIG. 2 is a front view showing a second embodiment of the same.

FIG. 3 is a front view showing a third embodiment of the above.

FIG. 4 is a plan view of the first embodiment shown in FIG.

FIG. 5 is a plan view of the second embodiment shown in FIG.

FIG. 6 is a plan view of the third embodiment shown in FIG.

FIG. 7 is a partial side view showing the operation of the shaft in each embodiment except for a member for preventing a tension member from coming off.

FIG. 8 is a partial vertical front view showing a state where a shaft is attached to a column in the first embodiment and the second embodiment.

FIG. 9 is a side view showing a state before attaching a tool for preventing a tension member from being detached from a shaft in a third embodiment, and a state b after attaching.

FIG. 10 is an explanatory view showing a use state of a tendon bending- up tool for prestressed concrete according to the present invention.

FIG. 11 is a front view showing a first embodiment of a conventional tendon bending machine .

FIG. 12 is a front view showing a third embodiment of the conventional tendon bending machine .

13 is an explanatory view showing a state of performing a bending up of the tension material by conventional tendon bending up tool.

14 is an explanatory view showing another state of performing a bending up of the tension material by conventional tendon bending up tool.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 pillar 5 base 7 side hole 8 axis 9 tension member 10 detachment prevention member

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl. ⁷ , DB name) E04G 21/12 104 B21F 9/00 B28B 23/02

Claims (3)

(57) [Claims] 1. A pillar is established on a base, and a required number of lateral holes are provided in the pillar at predetermined intervals.
It fitted a shaft for receiving the tension member under the peripheral surface rotatably, shaft of
Both ends are used to support the outside of the tendon so that it will not come off.
A tendon bending- up tool for prestressed concrete, comprising a detachment preventing member having a sufficient height . (2)Attachment members for preventing the strainer from coming off
Claims characterized by being fixed flanges respectively.
1Tendon bending of prestressed concreteRaising
Utensils. 3. The tension member disengagement prevention member straddles all axes.
Claims: It is a detachable plate that can be attached by mounting
Item 2. A tendon bending- up tool for prestressed concrete according to Item 1 .