JPH0446009Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to an intermediate anchoring device for an unbonded PC cable arranged in a continuous bending member.

(Conventional technology) After introducing prestress, unbonded PC cable
There is no need for grouting, which has the advantage of reducing man-hours, but when an accident occurs in the middle and the PC cable is cut, or the PC
When the copper wire loses its function, the prestress is lost over the entire length, so to prevent such an accident, the unbonded PC cable is anchored at the middle of the continuous bending member.

(Problems to be Solved by the Invention) However, the method for anchoring the unbonded PC cable at the intermediate portion is not easy, and there has been a demand for a simple and reliable intermediate anchoring device.

(Means for Solving the Problems) The present invention was proposed in order to satisfy the above-mentioned requirements. A groove-shaped notch is provided in the intermediate anchoring fitting, which has a PC cable insertion hole with wedge-shaped ends formed in the notch provided in the intermediate anchoring fitting, and communicates with the outer circumferential surface of the fitting and the insertion hole, An intermediate part anchoring device for an unbonded PC cable, which is fitted to the unbonded PC cable and wedged between the unbonded PC cable and the wedge-shaped ends of the insertion hole. This is related to.

(Function) As described above, the present invention has a PC cable insertion hole formed in a wedge shape at both ends, and has a groove shape in which one end communicates with the insertion hole and the other end opens on the outer peripheral surface. Using an intermediate anchoring fitting with a notch,
Fitting the slot-like notch of the intermediate anchoring fitting into the unbonded PC cable facing into the notch provided in the intermediate anchoring part of the unbonded PC cable whose both ends are anchored to the concrete member. Unbond to the insertion hole of the same anchoring fitting by
The middle part of the unbonded PC cable can be easily anchored via the anchoring fitting by inserting the PC cable and inserting a wedge material into the wedge-shaped parts provided at both ends of the insertion hole. It is.

(Example) The present invention will be described below with reference to the illustrated embodiments.

Figure 9 shows the layout of an unbonded PC cable C relative to a continuous beam or slab, with A indicating the end anchoring position and B indicating the intermediate anchoring position.

a is an intermediate anchoring device, which is a cylindrical piece 2 having a PC cable insertion hole 1 with wedge-shaped inner peripheral surfaces at both ends;
An intermediate vertical plate 3 is welded to the outer periphery of the intermediate part of the intermediate vertical plate 3, and one end communicates with the insertion hole 1 along the axial direction across the cylindrical piece 2 and the intermediate vertical plate 3, and the other end communicates with the intermediate vertical plate 3. A slot-like notch 4 that opens on the outer peripheral edge of 3
It is constructed by omitting .

Therefore, the anchoring portions (not shown) at both ends of the unbonded PC cable C, which are placed parallel to the reinforcing steel bars (not shown) along the entire length of the member, are set, and the anchoring parts (not shown) at both ends of the unbonded PC cable C, which are placed parallel to the reinforcing bars (not shown) along the entire length of the member, are set, Notch 5 at anchor position
The concrete is placed in the area other than the notch 5, and when the poured concrete reaches the required strength, the sheath D of the unbonded PC cable C in the notch 5 is removed, and the sheath D attached to the PC cable is removed. Clean any lubricants such as grease that may be present.

After that, the slot-shaped notch 4 of the intermediate anchoring part a is fitted into the unbonded PC cable C, and the PC cable C is inserted into the PC cable insertion hole 1 of the intermediate anchoring part a, and the cylindrical piece 2 is inserted. The intermediate anchoring tool a is set on the unbonded PC cable C by inserting a plurality of wedge pieces b into the wedge-shaped end of the PC cable insertion hole 1 from both ends of the cable.

Next, the notch 5 is filled with mortar or concrete 6 to anchor the intermediate portion of the unbonded PC cable C.

6 to 8 show another embodiment of the present invention, in which the inner peripheral surface of both ends of the cylindrical piece 2 made of steel pipe is
A conical high-strength mortar 7 is integrally layered to form wedge-shaped portions at both ends of the PC cable insertion hole 1 in the cylindrical piece 2. In the figure, parts equivalent to those of the above embodiment are given the same reference numerals.

(Effect of the invention) As described above, the present invention has a PC cable insertion hole formed in a wedge shape at both ends, and one end communicates with the insertion hole and the other end opens on the outer peripheral surface. Using an intermediate anchoring fitting with a slot-like cutout,
By fitting the slot-like notch to the unbonded PC cable facing into the notch provided in the intermediate anchoring part of the unbonded PC cable whose both ends are anchored to the same concrete member. You can easily attach the intermediate anchoring tool to the same PC cable, and then anchor the unbonded PC cable by simply inserting the wedge material into the wedge-shaped parts at both ends of the PC cable insertion hole of the intermediate anchoring tool. Because I can wear it,
Easily unbond without using special equipment
The intermediate anchoring device for PC cables can be configured and can be constructed quickly without requiring skilled workers.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional side view showing an embodiment of the intermediate anchoring device for an unbonded PC cable according to the present invention;
Figure 2 is its vertical front view, Figure 3 is the unbonded
4 is a front view thereof, FIG. 5 is a slope view of the wedge material, FIG. 6 is a longitudinal sectional side view showing another embodiment of the present invention, and FIG. 8 is a front view thereof, and FIG. 9 is a layout diagram of the unbonded PC cable with respect to a continuous beam or slab. C...Unbonded PC cable, I...Component,
a... Intermediate anchor attachment, b... Wedge material, 1... PC cable insertion hole, 2... Cylindrical piece, 4... Slot shaped notch, 5... Notch.

Claims (1)

[Scope of utility model registration request] An intermediate anchoring fitting in a concrete member having a PC cable insertion hole with both ends formed in a wedge shape in a notch provided in the intermediate anchoring part of an unbonded PC cable whose both ends are anchored to the same member. A slot-shaped cutout that communicates with the outer circumferential surface of the metal fitting and the insertion hole is fitted into the unbonded PC cable, and a slot-shaped cutout is provided between the unbonded PC cable and both wedge-shaped ends of the insertion hole. An intermediate anchoring device for an unbonded PC cable characterized by inserting wedge material into the middle.