JPH0246492Y2 - - 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 to 4 show an example of the spiral reinforcing bar 7 with a mounting part used in this invention. An upper annular attachment member 2 made of a circular annular body is arranged concentrically, and the upper end portion of the spiral reinforcing bar 1 and the upper annular member 2 are a connecting member made of a plurality of iron wires extending in the radial direction of the spiral reinforcing bar 1. 4 are connected by welding, and the connecting member 4 is extended toward the center of the upper annular member 2 to form a locking member 6 for attachment. Further, a lower annular member 3 for attachment, which is a small circular annular body made of iron wire tightly wound in a spiral, is placed inside the lower end of the spiral reinforcing bar 1.
are arranged concentrically, and the lower end of the spiral reinforcing bar 1 and the lower annular member 3 are connected by welding a connecting member 5 made of a plurality of iron wire rods extending in the radial direction of the spiral reinforcing bar 1.

FIG. 5 shows an anchor cap with spiral reinforcing bars according to the first embodiment of this invention using the spiral reinforcing bars 7 with attachment parts, which are fixed by welding to a cylindrical body 9 having a circular cross section and its upper end. The spiral reinforcing bar 7 with the mounting portion is attached to the outer periphery of the vertical steel anchor cap 8 consisting of the lid plate 10 and the lid plate 10.
The upper annular member 2 and the lower annular member 3 are fitted together, and the locking member 6 of the spiral reinforcing bar 7 with attachment portion is engaged with the upper end of the anchor cap 8.

6 to 8 show an anchor cap with spiral reinforcing bars according to a second embodiment of this invention, in which an anchor cap 8 is fixed to a steel cylinder 11 having an oval cross section and its upper end by welding. The upper annular member 2 and the lower annular member 3 are configured to engage with the longitudinal end of the cross section of the cylindrical body 11, but other configurations are possible. is the same as in the first embodiment.

9 to 11 show an anchor cap with spiral reinforcing bars according to the third embodiment of this invention, in which a short cylindrical body 13 and its upper end are placed inside the upper end of a large circular spiral reinforcing bar 1. A small-diameter steel upper annular member 2 for attachment consisting of a flange 14 connected to the flange 14 is arranged concentrically, and the upper end of the spiral reinforcing bar 1 and the flange 14 of the upper annular member 2 have a diameter of the spiral reinforcing bar 1. A steel rod located on a line is connected by welding, and the portion between the spiral reinforcing bar 1 and the upper annular member 2 in the rod is the connecting member 4, and the portion of the upper annular member 2 in the rod is the connecting member 4. The inner portion is the attachment locking member 6. Further, a small diameter steel lower annular member 3 consisting of a short cylindrical body 15 and a flange 16 connected to the lower end thereof is concentrically arranged inside the lower end of the spiral reinforcing bar 1. The lower end of and the lower annular member 3
A plurality of steel connecting members 5 extending in the radial direction of the spiral reinforcing bar 1 are connected to the flange 16 by welding. The cylindrical body 13 of the upper annular member 2 and the cylindrical body 15 of the lower annular member 3 are fitted onto the outer circumference of the cylindrical body 9 having a circular cross section in the anchor cap 8, and the locking member 6 is attached to the upper end of the anchor cap 8. is engaged with.

12 to 14 show an anchor cap with spiral reinforcing bars according to a fourth embodiment of this invention, in which an upper annular member 2 is connected to a short cylindrical body 17 having an oval cross section and its upper end. The lower annular member 3 is composed of a short cylindrical body 19 with an oval cross section and a flange 20 connected to its lower end, and the lower annular member 3 is composed of a short cylinder body 19 with an oval cross section and a flange 20 connected to the lower end of the short cylinder body 19. The cylindrical body 17 of the upper annular member 2 and the cylindrical body 19 of the lower annular member 3 are fitted into the cylindrical body 11, but the other configurations are the same as in the third embodiment.

15 to 17 show a bridge anchor device using the spiral reinforced anchor cap of the first embodiment, in which the lower part of the vertical anchor rod 21 made of a steel rod with a circular cross section is made of concrete. Alternatively, an annular blockage shoe 23 made of an elastic material such as rubber is fitted into the anchor rod 21 that is embedded and fixed in a support base 22 such as a bridge pier and protrudes from the support base 22. Shoes 2
3 is composed of a shoe main body 24 and a small-diameter fitting tube 25 connected to the inside of the upper end of the shoe main body 24, and the closed shoe 2
The lower surface of 3 is placed directly on the upper surface of the support base 22.

A plurality of buffer cylinders 27 made of an elastic material such as rubber and having a large number of longitudinal grooves 26 on the outer circumferential surface are fixed in the anchor cap 8 by press fitting or by an adhesive, and Each buffer cylinder 27 is fitted into the anchor rod 21, and the fitting cylinder 25 of the blocking shoe 23 is fitted inside the lower end of the anchor cap 8, and the lower end surface of the anchor cap 8 is connected to the bottom of the shoe main body 24. It is placed on the top. In addition, the spiral reinforcing bar 7 with the mounting part
and the part of the anchor cap 8 excluding the lower end,
It is embedded and fixed in bridge concrete 28, such as cross-beam concrete, cast between adjacent PC girders.

The hardness of the blocking shoe 23 may be the same as the hardness of the buffer tube 27, or may be softer than the hardness of the buffer tube 27.

Figures 18 to 20 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 21 with a circular cross section is made of concrete. A sliding support plate 29 made of a stainless steel plate is fitted into the anchor rod 21 that is embedded and fixed in a support base 22 such as an abutment or a bridge pier, and protrudes from the support base 22. The pedestal body 31 is made of an elastic material such as rubber, and the fitting tube 32 is integrally connected to the inside of the upper surface of the pedestal body 31. A sliding blocking cradle 34 consisting of a sliding layer 33 of tetrafluoroethylene or other synthetic resin integrally fixed to the lower surface of the cradle main body 31 is inserted through an anchor rod and placed on the sliding support plate 29. .

In the anchor cap 8 having an oval cross section,
A rubber center holding packing 35 is fitted and fixed with adhesive as necessary, and each packing 3
The anchor rod fitting concave surface 37 of the central support portion 36 in 5 is fitted to both side surfaces of the anchor rod 21, and the fitting tube 32 of the sliding blockage pedestal 34 is fitted inside the lower end of the anchor cap 8. At the same time, the lower end surface of the anchor cap 8 is placed on the upper surface of the cradle main body 31, and the anchor cap 8 is arranged so that the longitudinal direction of its cross section faces the longitudinal direction of the bridge, and the lower end surface of the anchor cap 8 is placed on the upper surface of the cradle body 31. 34 holds the anchor cap 8 at a predetermined height.

The portions of the spiral reinforcing bar 7 with attachment portion and the anchor cap 8 excluding the lower end are the adjacent PCs.
The anchor rod is embedded and fixed in bridge concrete 28 such as cross-beam concrete cast between the girders, and an anchor rod movement permissible space 38 is provided between both sides of the packing 35 in the longitudinal direction and the anchor rod 21.
When the bridge moves in its longitudinal direction, the anchor rod 21 moves relatively toward the longitudinal end of the packing 35 while pressing and deforming the inwardly protruding arcuate portion 39 outward.

The length of the sliding support plate 29 in the longitudinal direction of the bridge is set so that the entire circumference of the sliding layer 33 is always placed on the sliding support plate 29 even if the bridge moves by an allowable stroke.

When implementing this invention, the locking member 6 may be fixed to the anchor cap 8 by spot welding.

According to this invention, a large circular spiral reinforcing bar 1
A small-diameter upper annular member 2 and a small-diameter lower annular member 3 are arranged inside the upper and lower ends.
are arranged and connected via connecting members 4 and 5,
In addition, since the attachment locking member 6 protruding inwardly from the upper annular member 2 is fixed to form the spiral reinforcing bar 7 with an attachment part, the upper annular member 2 and the lower part of the spiral reinforcing bar 7 with an attachment part are simply connected to each other. By performing a simple operation of fitting the annular member 3 into the vertical anchor cap 8 and engaging the locking member 6 with the upper end of the anchor cap 8, the anchor cap 8 and the spiral reinforcing bar surrounding it are assembled. 1 can be arranged concentrically with the anchor cap, and can be firmly held so as not to be eccentric, and the spiral reinforcing bar can be fixed by a simple means of engaging the locking member 6 with the upper end of the anchor cap. 1 can be maintained at a predetermined height.

[Brief explanation of the drawing]

Figures 1 to 3 show an example of a spiral reinforcing bar with a mounting part used in this invention, in which Figure 1 is a side view, Figure 2 is a plan view, and Figure 3 is A of Figure 1. -A sectional view. FIG. 4 is a partially cutaway side view showing an anchor cap with spiral reinforcing bars according to the first embodiment of this invention. Fifth
7 to 7 show an anchor cap with spiral reinforcing bars according to the second embodiment of this invention, in which FIG. 5 is a partially cutaway side view, FIG. 6 is a plan view,
FIG. 7 is a sectional view taken along the line B--B in FIG. 5. 8 to 10 show an anchor cap with spiral reinforcing bars according to the third embodiment of this invention, in which FIG. 8 is a partially cutaway side view, FIG. 9 is a plan view,
FIG. 10 is a bottom view. Figures 11 to 13
The figures show an anchor cap with spiral reinforcing bars according to a fourth embodiment of the invention, in which FIG. 11 is a partially cutaway side view, FIG. 12 is a plan view, and FIG. 13 is a bottom view. Figures 14 to 16 are the first
This shows a bridge anchor device using an anchor cap with spiral reinforcing bars according to an embodiment,
Figure 14 is a vertical side view, Figure 15 is C of Figure 14.
-C line enlarged sectional view, Figure 16 is D-D in Figure 14
It is a line enlarged sectional view. 17 to 19 show an anchor device for restricting bridge movement using an anchor cap with spiral reinforcing bars according to the second embodiment of this invention, in which FIG. 17 is a vertical side view, and FIG. 18 is a vertical side view. Enlarged sectional view taken along line E-E in Figure 17,
FIG. 19 is an enlarged sectional view taken along line FF in FIG. 17. In the figure, 1 is a spiral reinforcing bar, 2 is an upper annular member, 3 is a lower annular member, 4 and 5 are connecting members, 6 is a locking member, 7 is a spiral reinforcing bar with a mounting part, 8 is an anchor cap, and 13 is a cylindrical body , 14
is a flange, 15 is a cylindrical body, 16 is a flange, 1
7 is a cylinder, 18 is a flange, 19 is a cylinder, 20 is a flange, 21 is an anchor rod, 22 is a support base, 2
3 is a blockage foot, 27 is a buffer tube, 28 is bridge concrete, 29 is a sliding support plate, 34 is a sliding blockage pedestal, 35 is a packing, 36 is a central support part, 37
38 is a concave surface for fitting the anchor rod, and 38 is a space for allowing movement of the anchor rod.

Claims (1)

[Scope of utility model registration request] A small-diameter upper annular member 2 for attachment and a small-diameter lower annular member 3 for attachment are arranged inside the upper and lower ends of the large circular spiral reinforcing bar 1 and are connected to the upper Annular member 2
A mounting locking member 6 protruding inwardly is fixed to the spiral reinforcing bar 7 with a mounting portion,
The upper annular member 2 and the lower annular member 3 of the spiral reinforcing bar 7 with attachment portions are fitted into the vertical anchor cap 8, and the locking member 6 is engaged with the upper end of the anchor cap 8. Features an anchor cap with spiral reinforcing bars for bridges.