JPH0246491Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an anchor cap with spiral reinforcing bars used in an anchor device for preventing bridge collapse or other anchor devices for bridges.

When an anchor cap is buried in the concrete of a bridge, spiral reinforcing bars surrounding the anchor cap are buried in the concrete to reinforce the concrete where the anchor cap is embedded. Must be placed in the center.

The object of this invention is to provide an anchor cap with spiral reinforcing bars for a bridge that can hold the anchor cap in the center of the spiral reinforcing bars by a simple means.

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

Figures 1 and 2 show an example of a spiral reinforcing bar with a small diameter annular part used in this invention, in which a circular small diameter annular part 2 is connected to the upper end of a large circular spiral reinforcing bar 1. A locking arm 6 that is locked to the end plate of the cap is connected to the end of the small-diameter annular portion 2, and a circular small-diameter annular portion 3 is connected to the lower end of the spiral reinforcing bar 1. .

3 to 5 show an anchor cap with spiral reinforcing bars of the first embodiment of this invention using the spiral reinforcing bars 4 with small diameter annular parts, in which the small diameter annular parts 2 and 3 have a circular cross section. The locking arm 6 is fitted on the outside of the steel anchor cap 5 and is fixed to the upper end plate 7 of the anchor cap 5 by spot welding 8.

Figures 6 to 8 show a bridge anchor device using the spiral reinforcing anchor cap of the first embodiment, in which the lower part of the vertical anchor rod 9 made of a steel rod with a circular cross section is a bridge abutment made of concrete. Alternatively, an annular blockage shoe 11 made of an elastic material such as rubber is fitted into an anchor rod 9 that is embedded and fixed in a support base 10 such as a bridge pier and protrudes from the support base 10. The shoe 11 is composed of a shoe main body 12 and a small-diameter fitting tube 13 connected to the inside of its upper end, and the lower surface of the closed shoe 11 is placed directly on the upper surface of the support base 10.

A plurality of buffer tubes 15 made of an elastic material such as rubber and having a large number of longitudinal grooves 14 on the outer circumferential surface are fixed in the anchor cap 5 by press fitting or by fitting and fixing with adhesive, Each buffer cylinder 15 is fitted into the anchor rod 9, and the fitting cylinder 13 of the blocking shoe 11 is fitted inside the lower end of the anchor cap 5, and the lower end surface of the anchor cap 5 is connected to the bottom of the shoe main body 12. It is placed on the top. Further, the spiral reinforcing bars 4 with small diameter annular portions and the portions of the anchor caps 5 except for the lower ends are embedded and fixed in bridge concrete 16 such as transverse girder concrete cast between adjacent PC girders. The hardness of the blockage shoe 11 is the same as that of the buffer tube 15.
The hardness may be the same as that of the buffer cylinder 1, or the hardness of the buffer cylinder 1
The hardness may be softer than 5.

9 to 11 show an anchor cap with spiral reinforcing bars according to a second embodiment of this invention, in which a steel anchor cap 5 with an oval cross section is used, but the other configurations are as follows. This is the same as in the first embodiment.

Figures 12 to 14 show an anchor device for restricting bridge movement using an anchor cap with spiral reinforcing bars according to the second embodiment, in which the lower part of a vertical steel anchor rod 9 with a circular cross section is made of concrete. A sliding support plate 17 made of a stainless steel plate is fitted into the anchor rod 9 that is embedded and fixed in a support 10 such as an abutment or a bridge pier and protrudes from the support 10.
0 and fixed with concrete nails 18 or the like, and further includes an oval pedestal body 19 made of an elastic material such as rubber, and an oval fitting cylinder 20 integrally connected to the inside of the upper surface thereof. and its pedestal body 19
A sliding blocking pedestal 22 consisting of a sliding layer 21 of tetrafluoroethylene or other synthetic resin integrally fixed to the lower surface is inserted into the anchor rod 9 and is attached to the sliding support plate 1.
It is placed on 7.

In the anchor cap 5 having an oval cross section,
A plurality of rubber center holding packings 23 are fitted at intervals in the longitudinal direction of the cap and fixed with adhesive, and the anchor rod fitting concave surfaces 25 of the central support portion 24 in each packing 23 are fitted on both sides of the anchor rod 9. fitted and anchor cap 5
The fitting cylinder 20 of the sliding blockage pedestal 22 is fitted inside the lower end of the anchor cap 5, and the lower end surface of the anchor cap 5 is placed on the upper surface of the pedestal body 19. The anchor cap 5 is arranged so that the longitudinal direction of the surface faces the longitudinal direction of the bridge, and the anchor cap 5 is held at a predetermined height by the sliding blockage pedestal 22.

The spiral reinforcing bar 4 with the small diameter annular portion and the portion of the anchor cap 5 excluding the lower end are adjacent to each other.
The anchor rod is embedded and fixed in bridge concrete 16 such as transverse girder concrete cast between the PC girders, and an anchor rod movement permissible space 26 is provided between both longitudinal side portions of the packing 23 and the anchor rod 9. When the bridge moves in its longitudinal direction, the anchor rod 9 moves relatively toward the longitudinal end of the packing 23 while pressing and deforming the inwardly protruding arcuate portion 27 outward.

The length of the sliding support plate 17 in the longitudinal direction of the bridge is set so that the entire circumference of the sliding layer 21 is always placed on the sliding support plate 17 even if the bridge moves by an allowable stroke.

As in the above embodiment, the locking arm 6 is attached to the small diameter annular portion 2.
If provided, by engaging the locking arm 6 with the end plate 7 of the anchor cap 5, it is possible to easily position the spiral reinforcing bar 4 with the small diameter annular portion in the longitudinal direction of the anchor cap.

In the case of the above embodiment, one iron wire is bent to form the large circular spiral reinforcing bar 1, the small diameter annular portions 2 and 3, and the locking arm 6. The small-diameter annular part 2 with the locking arm 6 and the other small-diameter annular part 3 are made of iron wire (steel wire) with a small diameter, and
The arms connected to the ends of the small-diameter annular portions 2 and 3 may be fixed to the ends of the spiral reinforcing bars 1 by welding.

Also, both the locking arm 6 and the small diameter annular portion 3 may be fixed to the anchor cap 5 by welding, or the locking arm 6 is not fixed to the anchor cap 5 by welding, but the small diameter annular portion 3 is fixed to the anchor cap 5. It may be fixed by welding.

According to this idea, a large circular spiral reinforcing bar 1
At one end and the other end, the spiral reinforcing bar 1
Small-diameter annular parts 2 and 3 arranged concentrically are connected to form a spiral reinforcing bar 4 with a small-diameter annular part, and the spiral reinforcing bar 4 with a small-diameter annular part is fitted into an anchor cap 5 and fixed by welding. Therefore, by an extremely simple means, the anchor cap 5 and the spiral reinforcing bar 1 surrounding it can be arranged concentrically, and can be firmly held so as not to be eccentric, and can be easily secured during transportation or construction. Effects such as there being no fear that the anchor cap 5 and the spiral reinforcing bar will separate during the construction can be obtained.

[Brief explanation of the drawing]

Figure 1 is a side view showing an example of a spiral reinforcing bar with a small diameter annular portion used in this invention;
The figure is a plan view, FIGS. 3 to 5 show an anchor cap with a spiral reinforcing bar according to the first embodiment of this invention using the spiral reinforcing bar 4 with a small diameter annular part, and FIG. 3 shows a side view. Figure, 4th
The figure is a plan view, and FIG. 5 is a sectional view taken along the line A--A in FIG. 3. 6 to 8 show a bridge anchor device using an anchor cap with spiral reinforcing bars according to the first embodiment, in which FIG. 6 is a vertical cross-sectional side view, and FIG. 7 is a B-B line in FIG. 8 is a sectional view taken along the line CC in FIG. 6. 9 to 11 show an anchor cap with spiral reinforcing bars according to the second embodiment of this invention, in which FIG. 9 is a side view, FIG. 10 is a plan view, and FIG. 11 is the same as in FIG. 9. It is a sectional view taken along the line DD. 12 to 14 show an anchor device for restricting bridge movement using an anchor cap with spiral reinforcing bars according to the second embodiment, and FIG. 12 is a longitudinal side view;
13 is a sectional view taken along the line E--E in FIG. 12, and FIG. 14 is a sectional view taken along the line FF--FIG. 12. In the figure, 1 is a spiral reinforcing bar, 2 is a small diameter annular part, 3 is a small diameter annular part, 4 is a spiral reinforcing bar with a small diameter annular part, 5 is an anchor cap, 6 is a locking arm, 7 is an upper end plate, 8 is a spot weld, 9 is an anchor rod,
10 is a support stand, 11 is a blocking shoe, 15 is a buffer tube,
16 is bridge concrete, 17 is a support plate, 22 is a sliding blocking pedestal, 23 is packing, and 26 is an anchor rod movement permissible space.

Claims (1)

[Scope of utility model registration request] Small-diameter annular parts 2 and 3 arranged concentrically with the spiral reinforcing bar 1 are connected to one end and the other end of the large-circular spiral reinforcing bar 1 to form a spiral reinforcing bar 4 with a small-diameter annular part. An anchor cap with spiral reinforcing bars for a bridge, characterized in that a spiral reinforcing bar 4 with a small diameter annular portion is fitted into an anchor cap 5 and fixed by welding.