JPH0343309Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a device for attaching a corrosion-resistant cover for a PC cable to a concrete member such as a concrete slab or a concrete girder in which a PC cable is buried.

Conventionally, as a mounting device for a corrosion-resistant cover for a PC cable in a concrete member where the PC cable is buried, a steel nut is fixed by welding around the bearing plate of the concrete member where the PC cable is buried.
and the open end of the corrosion-resistant cover that covers the protruding end of the PC cable and the anchor head in the PC cable buried concrete member is brought into contact with the bearing plate, and the steel bolt inserted through the flange provided on the corrosion-resistant cover is A structure in which a corrosion-resistant cover is fixed to a bearing plate by screwing onto a steel nut is known.

However, in the case of a corrosion-resistant cover mounting device with this structure, a portion of the shaft portions of the steel nuts and bolts are exposed and corroded, so the durability of the corrosion-resistant cover mounting device is short and it is difficult to install the corrosion-resistant cover. When it becomes necessary to attach and detach, there is a problem in that it is difficult to attach and detach.

This invention advantageously solved the above-mentioned problem for PCs.
The purpose of the present invention is to provide a corrosion-resistant cover attachment device for a cable buried in concrete member, and its gist is to provide an anchor head 2 in a PC cable buried concrete member 1.
A plurality of steel nuts 4 are fixed by welding around a bearing plate 3 that supports the PC cable, and the open end of a corrosion-resistant cover 6 that covers the protruding end of the PC cable 5 and the anchor head 2 in the PC cable buried concrete member 1. A recess 8 provided in the flange 7 of the section is placed over the steel nut 4, and the recess 8
This corrosion-proof cover mounting device for a concrete member buried in a PC cable is characterized in that a corrosion-proof cover 6 is fixed to a bearing plate 3 by bolts 9 inserted through the bottom plate of the PC cable and screwed into a steel nut 4.

Next, this invention will be explained in detail using illustrated examples.

1 and 2 show a synthetic resin corrosion-resistant cover 6 used in a first embodiment of this invention, in which a flange 7 is integrally connected to the open end of a cover body 10 having a circular box-like cross section. A circular annular groove 11 having a trapezoidal cross section is provided on the inner circumferential side of the front part of the flange 7, and a plurality of nut accommodating recesses 8 are provided on the outer circumferential side of the front part of the flange 7 at equal angles. The holes 12 for bolt insertion are provided in the bottom plate of the recesses 8 at intervals.

FIG. 3 shows a rubber annular seal packing 13 used in the first embodiment of this invention, in which a packing body 14 with a trapezoidal cross section has a central annular protrusion 15 located at the center of its width. The side annular protrusions 16 located on both sides in the width direction of the packing body are integrally arranged, and the height of the central annular protrusion 15 is higher than the height of the side annular protrusions 16, and the side annular protrusions 16 are adjacent to each other. An annular groove 17 having an arcuate cross section is formed between the protrusions 15 and 16.

FIG. 4 shows a state in which the annular seal packing 13 is attached to the corrosion-resistant cover 6, and shows the packing body 14 in the annular seal packing 13.
is fitted into the annular groove 11 in the corrosion-resistant cover 6,
The central annular protrusion 15 and the side annular protrusion 16 protrude from the annular groove 11.

5 to 7 show a corrosion-proof cover mounting device according to a first embodiment of this invention using the corrosion-proof cover 6 and the annular seal packing 13, in which a PC cable buried concrete member 1
A plurality of steel nuts 4 are arranged at equal angular intervals around the anchor head 2 at
The corrosion-resistant cover 6 is fixed by welding to the outer surface of the steel bearing plate 3 in the PC cable buried concrete member 1 and is equipped with an annular seal packing 13.
It is arranged so as to cover the anchor head 2 and the protruding end of the PC cable 5 in the PC cable buried concrete member 1, and the corrosion-proof cover 6 is filled with grease as necessary, and the recess 8 in the flange 7 of the corrosion-proof cover 6 is placed on the nut 4, the annular seal packing 13 is brought into contact with the bearing pressure plate 3, the bolt 9 inserted through the washer 18 and the bottom plate of the recess 8 is screwed into the nut 4, and the tightening force of the bolt 9 is increased. As a result, the annular protrusions 15 and 16 of the annular seal packing 13 are strongly pressed against the pressure plate 3 and are elastically deformed, the flange 7 is brought into contact with the pressure plate 3, and the nut 4 is It is accommodated in a closed space surrounded by the recess 8 and the bearing pressure plate 3.

8 and 9 show a second embodiment of this invention, in which an annular groove 20 surrounding a nut accommodating recess 8 is provided at the front of a flange 7 of a corrosion-resistant cover 6. O-ring 21 to 20
is fitted, and its O-ring 21 is pressed against the bearing pressure plate 3 by the tightening force of the bolt 9, and is configured to reliably prevent moisture from entering the recess 8 from between the bearing pressure plate 3 and the flange 7. However, the other configurations are the same as in the first embodiment.

Note that the portion of the PC cable 5 to be buried in the concrete member 19 is accommodated within the sheath 20. Furthermore, since the means for fixing the PC cable 5 and the anchor head 2 is well known, a description thereof will be omitted.

When implementing this invention, the synthetic resin constituting the corrosion-resistant cover 6 is, for example, polypropylene mixed with glass fibers. Further, the bolt 9 may be made of synthetic resin, stainless steel, or an ordinary steel bolt coated with synthetic resin.

According to this invention, a plurality of steel nuts 4 are fixed by welding around the bearing plate 3 that supports the anchor head 2, and the open end of the corrosion-resistant cover 6 that covers the protruding end of the PC cable 5 and the anchor head 2. A recess 8 provided in the flange 7 of the part is placed over the nut 4, and the corrosion-resistant cover 6 is fixed to the bearing plate 3 by a bolt 9 inserted through the bottom plate of the recess 8 and screwed into the nut 4. Therefore, the steel nut 4 can be accommodated in the space surrounded by the recess 8 of the corrosion-resistant cover 6 and the bearing plate 3, and corrosion of the steel nut 4 can be prevented, thereby increasing the durability of the corrosion-resistant cover mounting device. In addition to improving the corrosion resistance, the corrosion-resistant cover 6 can be easily attached and detached at any time.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional side view of a corrosion-resistant cover used in the first embodiment of this invention, Fig. 2 is a front view thereof, and Fig. 3 is a part of an annular seal packing used in the first embodiment of this invention. longitudinal side view,
FIG. 4 is a longitudinal sectional side view showing a state in which the annular seal packing is attached to the corrosion-resistant cover. 5 to 7 show an eleventh embodiment of this invention, in which FIG. 5 is a longitudinal sectional side view of the corrosion-resistant cover mounting device, FIG. 6 is a front view thereof, and FIG. 7 is the same as that shown in FIG. It is a longitudinal side view which expands and shows a part of. FIGS. 8 and 9 show a second embodiment of this invention, in which FIG. 8 is a vertical sectional side view showing a part of the corrosion-resistant cover mounting device, and FIG. FIG. In the figure, 1 is a PC cable buried concrete member, 2 is an anchor head, 3 is a bearing plate, 4 is a steel nut, 5 is a PC cable, 6 is a corrosion protection cover,
7 is a flange, 8 is a recess, 9 is a bolt, 11 is a circular annular groove, 12 is a through hole for bolt insertion, 13 is a rubber annular seal packing, 15 is a central annular protrusion,
16 is a side annular protrusion.

Claims (1)

[Scope of utility model registration request] Around the bearing plate 3 that supports the anchor head 2 in the PC cable buried concrete member 1,
A plurality of steel nuts 4 are fixed by welding, and the above-mentioned
PC in PC cable buried concrete member 1
A recess 8 provided in the flange 7 at the open end of the corrosion-resistant cover 6 that covers the protruding end of the cable 5 and the anchor head 2 is placed over the steel nut 4, and the bottom plate of the recess 8 is inserted into the steel nut. made nut 4
A corrosion-resistant cover mounting device for a concrete member in which a PC cable is buried, characterized in that a corrosion-resistant cover 6 is fixed to a bearing plate 3 by bolts 9 screwed together.