JPH0741794Y2 - Jig for inserting wedge member into PC cable - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jig for inserting and setting a wedge member used for fixing an end portion of a PC cable, which is strained after hardening of concrete, to an anchor head, into the PC cable. It is a thing.

[0002]

2. Description of the Related Art As a method of prestressing a concrete structural member with a PC cable, there is known a so-called post-tension system in which the PC cable is tensioned and fixed after hardening of the concrete. In addition, as a concrete method for fixing the end portion of the strained PC cable, a fixing method called VSL method is widely adopted and provided for the convenience of users.

That is, the VSL method is prepared by preparing an anchor head having a plurality of PC cable insertion holes at predetermined positions of a disc, and inserting the PC cable into each insertion hole of the anchor head and at the same time each PC. The wedge member divided into the cables is inserted in advance for positioning (plate fixing), and then the wedge member is attached to the fixing recess of the anchor head with a predetermined tension applied to the PC cable by the center hole type jack device. Then, the PC cable is fixed.

However, in this VSL method, not only does the wedge member fall off when the wedge member is inserted into the PC cable, but the gap between the PC cables is narrow, so that the PC cable located in the central portion is located. Inserting a wedge member into the anchor and positioning the anchor head in the fixing recess (temporary fixing)
It has been pointed out that there are problems to be solved, such as the inability to smoothly carry out the fixing work of the PC cable because the setting including the above is complicated.

[0005]

[Means for Solving the Problems] Therefore, in this invention,
An operation tube body having a diameter slightly larger than that of the PC steel material is connected to an end portion of a holding tube that surrounds the head side portion of the wedge member, and a step portion that abuts on the wedge member head is provided inside the holding tube. It is intended to facilitate and ensure the setting operation of the wedge member by a jig formed by arranging a magnet on the stepped portion and forming the magnet.

[0006]

[Operation] In the present invention, the wedge member and the operating cylinder are inserted into the PC cable while the head side of the wedge member is adsorbed and held by the magnet arranged on the step of the holding cylinder, and the operating cylinder is gripped. Then, the wedge member is slid to the wedge fixing recess of the anchor head to set the wedge member.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the insertion jig according to the present invention will be described in detail below with reference to the accompanying drawings.

Referring to FIG. 1, an insertion jig 1 according to the present invention.
No. 0 is provided with a holding cylinder 16 that surrounds and holds the head side portion (maximum diameter portion) of the wedge member 14 provided with the split groove 12, and the end portion side of this holding cylinder 16 is slightly smaller than the diameter of the PC cable 18. An operating cylinder 20 having a predetermined length set to a large diameter is connected to the holding cylinder 16, and a step 22 is formed inside the holding cylinder 16 by the tip of the operation cylinder 20 and a magnet 24 is arranged on the step 22. It is configured by

The magnet 24 disposed on the step portion 22 serves to prevent the wedge member 14 surrounded and held by the holding cylinder 16 from falling off during the setting operation.

Next, a procedure for setting the wedge member 14 using the insertion jig 10 according to the present invention having the above-described structure will be described.

That is, FIG. 2A shows that after the concrete 26 is hardened, the end form is removed and the casting pressure plate 2 is removed.
8 and a large number of PCs inserted through the sheath member 30
The end (not shown) of the cable 18 is already fixed. Reference numeral 32 is a spiral reinforcing bar for reinforcing the fixing portion.

In this state, first, the anchor head 34 is suspended and held by an appropriate suspending means, and the tip end portion of each PC cable 18 is guided by an appropriate cylinder 19 such as a gas pipe to guide the anchor head 34. It is inserted into the PC cable insertion hole 36. And anchor head 3
2 is slid to the right in FIG. 2a along the PC cable 18 and brought into contact with the casting pressure plate 28 (shown by a broken line).

Next, the tubular member 19 is removed and the wedge member 14 is inserted into each PC cable 18. At this time, the wedge member 14 inserted into the PC cable 18 located at the center is shown in FIG. 1, the wedge member 14 is attached to the holding cylinder 16 of the insertion jig 10 and the head side portion is previously attracted to the magnet 24 arranged on the step portion 22 thereof. The body 20 is inserted into the PC cable 18 as it is, and the operation cylinder body 20 is grasped, and the wedge member 1
4 may be moved and pushed into the wedge fixing concave portion 34a of the anchor head 34 to perform setting including temporary fixing (see FIG. 2b).

The PC cable 18 located at the peripheral portion
Regarding the setting of the wedge member 14 in the case, when the number of the PC cables 18 is several tens, using the insertion jig according to the present invention, the setting of the wedge member 14 can be easily and efficiently performed. It is possible, but it goes without saying that it is possible to proceed as usual.

When the setting of each wedge member 14 is completed in this way, the wedge member 14 is securely attached to the anchor head 34 while a predetermined tension is applied to the PC cable by using the center hole type jack device. By fixing the above, removing the jack device, and then removing the excess portion of the PC cable, it is possible to add a predetermined prestress to the concrete.

[0016]

As described above, according to the jig for inserting a wedge member according to the present invention, a PC located in the central portion of the anchor head and having a narrow gap between adjacent PC cables.
Even with a cable, since the work is performed while the wedge member is attracted by the magnet, setting including insertion of the wedge member and positioning of the anchor head in the fixing recess can be performed easily, quickly and surely. The cable fixing work can be carried out smoothly, and its practical effect is extremely large.

Also in the procedure for setting the wedge member to the PC cable using this insertion jig, the heavy anchor head is suspended and held by an appropriate suspending means, and the tip end portion of each PC cable is tubular. Using your body as a guide, insert it into the PC cable insertion hole of the anchor head,
Since it is slid, the work can be facilitated.

The preferred embodiment of the jig for inserting a wedge member according to the present invention has been described above. However, the present invention is not limited to this embodiment and various modifications can be made without departing from the spirit of the present invention. Of course, it can be modified.

[Brief description of drawings]

FIG. 1 is a partially omitted cross-sectional explanatory view showing a relationship between a wedge member inserting jig and a wedge member according to a preferred embodiment of the present invention.

2A and 2B are explanatory views of a setting procedure of a wedge member on a PC cable, wherein a is an explanatory view when inserting an anchor head into a PC cable, and b is a jig for inserting a wedge member shown in FIG. It is explanatory drawing at the time of setting a wedge member using it.

[Explanation of symbols]

10 Insertion jig, 12 Split groove, 1
4 wedge members, 16 holding cylinders, 18 PC cables, 19 cylinders, 20 operation cylinders, 22
Step part, 24 magnet, 26 concrete, 28 casting pressure support plate, 30 sheath member, 32 spiral rebar, 34 anchor head,

Claims (1)

[Scope of utility model registration request] 1. A jig for inserting a wedge member used for fixing an end portion of a PC cable, which has been tensioned after hardening of concrete, to an anchor head, the head side of the wedge member. PC on the end of the holding cylinder that surrounds the
It is characterized in that an operating cylinder set to have a diameter slightly larger than the diameter of the steel material is connected to form a step portion abutting the head of the wedge member inside the holding cylinder, and a magnet is arranged on the step portion. A jig for inserting a wedge member into a PC cable.