JPH0246490Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to an anchor device for restricting bridge movement, which is used for the purpose of preventing movable bearings of bridges from falling from supports such as bridge abutments and piers when a strong earthquake occurs. It is.

Conventionally, as anchor devices for restricting bridge movement,
As shown in FIGS. 1 and 2, the lower part of a vertical anchor rod 1 is embedded and fixed in a support 2 such as an abutment or a bridge pier, and a corrosion-resistant and cradle 10 made of rubber sponge is attached to the upper part of the anchor rod 1. and place the corrosion-proofing/receiving stand 10 on the support stand 2.Furthermore, an anchor pipe 3 having a cross section that is elongated in the longitudinal direction of the bridge is placed over the top of the anchor rod 1, and the corrosion-protecting/receiving stand 10 is placed on the support stand 2. It is placed on a stand 10, and in this state bridge concrete 4 such as crossbeam concrete is poured.
A structure in which an anchor pipe 3 is embedded and fixed in the bridge concrete 4 is known.

However, in the case of the anchor device for restricting bridge movement having this structure, the corrosion-protecting and cradle 10 for blocking the space between the support base 2 and the lower end of the anchor pipe 3 to protect the upper part of the anchor rod 1 from corrosion is attached to the anchor rod. 1 and is fixed in place, when the movable support part of the bridge moves due to temperature changes, etc., the corrosion protection/rest 10 cannot follow the movement of the bridge, and the corrosion protection/rest 10 There is a problem in that the upper part of the holder 10 is pressed and deformed by the bridge, and as a result, the anti-corrosion and pedestal 10 is quickly permanently deformed and no longer exhibits its anti-corrosion function.

The object of this invention is to provide an anchor device for restricting bridge movement that advantageously solves the above-mentioned problems.

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

Figures 3 and 4 show a flat annular center holding packing 11 made of an elastic material such as rubber used in an embodiment of the invention, and are shown in both halves of an anchor pipe with an oval cross section. Two semicircular parts 1 fitted into a circular inner surface
2, and a central support portion 14 having an anchor rod fitting concave surface 13 that is fitted to both side surfaces of the anchor rod at the longitudinal center of the cross section of the anchor pipe.
and an inwardly protruding arcuate portion 15 connecting the central support portion 14 and each of the semicircular portions 12, and a bearing surface on the outside of the central support portion 14 that abuts the inner surface of the central portion of the anchor pipe. 16 are formed.

Figures 5 to 8 show an embodiment of this invention using the center-holding packing 11, in which the lower part of the vertical steel anchor rod 1 with a circular cross section is attached to a concrete abutment or pier. A sliding support plate 9 made of a stainless steel plate is fitted into the anchor rod 1 which is embedded and fixed in the support stand 2 and protrudes from the support stand 2, and the sliding support plate 9 is placed on the support stand 2. An oval pedestal body 5 fixed with concrete nails 17 or the like and made of an elastic material such as rubber, an oval fitting cylinder 6 integrally connected to the inside of the upper surface of the pedestal body 5, and the pedestal body 5. A sliding closure pedestal 8 consisting of a sliding layer 7 of tetrafluoroethylene or other synthetic resin integrally fixed to the lower surface of the anchor rod 1 is inserted through the anchor rod 1 and placed on a sliding support plate 9.

A plurality of center-holding packings 11 are fitted at intervals in the longitudinal direction of the pipe into a steel anchor pipe 3 having an oval cross section and a lid 18 fixed to the upper end thereof, and are fixed with adhesive. Anchor rod fitting concave surface 13 of the support portion 14
are fitted to both sides of the anchor rod 1, and the fitting tube 6 of the sliding blockage pedestal 8 is fitted inside the lower end of the anchor pipe 3, and the lower end surface of the anchor pipe 3 is fitted to the pedestal. The anchor pipe 3 is placed on the upper surface of the main body 5, and furthermore, the anchor pipe 3 is arranged so that the longitudinal direction of its cross section faces the longitudinal direction of the bridge, and the anchor pipe 3 is held at a predetermined height by the sliding blocking pedestal 8. Ru.

A reinforcing steel coil (not shown) is placed on the outside of the anchor pipe 3 to surround it, and the coil and the rest of the anchor pipe 3 except for the lower end are cast between adjacent PC girders. Embedded and fixed in bridge concrete 4 such as cross girder concrete,
In addition, an anchor rod movement permissible space 19 is provided between both sides of the packing 11 in the longitudinal direction and the anchor rod 1.
is provided, and when the bridge moves in its longitudinal direction, the anchor rod 1 has an inwardly projecting arcuate portion 15
While pressing and deforming the packing 11 outward,
move relative to each other towards the longitudinal ends of.

The length of the sliding support plate 9 in the longitudinal direction of the bridge is set so that the entire circumference of the sliding layer 7 is always placed on the sliding support plate 9 even if the bridge moves by an allowable stroke.

If the fitting tube 6 of the sliding blockage pedestal 8 is fitted inside the anchor pipe 3 as in the embodiment described above, moisture can be reliably prevented from entering through the fitting portion between the anchor pipe and the sliding blockage pedestal 8. can do.

When implementing this idea, instead of fitting a plurality of packings 11 into the anchor pipe 3, one packing having the required length may be fitted.

According to this invention, the lower end of the anchor pipe 3 is provided with a cradle body 5 made of an elastic material, a fitting tube 6 integrally provided on the upper surface thereof, and a sliding layer 7 fixed to the lower surface of the cradle body 5. The upper part of the oval sliding blockage pedestal 8 is fitted, and the sliding layer 7 of the sliding blockage pedestal 8 is fitted.
is placed on a sliding support plate 9 fixed to the upper surface of the support platform 2, so when the bridge moves, the sliding blocking platform 8 can be smoothly slid along with the movement of the bridge. Since the space between the lower end of the pipe 3 and the support base 2 is always reliably closed even if the bridge moves, the corrosion resistance of the inner surface of the anchor pipe 3 and the upper part of the anchor rod 1 can be improved. In addition, if a sliding blockage pedestal is fixed to the top surface of the support base and the lower end surface of the anchor pipe is configured to slide on the top surface of the sliding blockage pedestal, the area of the sliding blockage pedestal, which is relatively thick, should be This is uneconomical since it needs to be made extremely wide, but in the case of this invention, since the sliding blockage pedestal is fitted to the lower end of the anchor pipe 3, the area of the sliding blockage pedestal 8 can be reduced, making it economical. Effects such as being more accurate can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal side view showing a conventional bridge movement restricting anchor device, and FIG. 2 is a cross-sectional view taken along the line A--A. FIG. 3 is a plan view of the center-holding packing made of elastic material used in the embodiment of this invention;
FIG. 4 is a side view thereof, and FIG. 5 is a vertical side view showing an embodiment of this invention using the packing.
Fig. 6 is an enlarged sectional view taken along the line B-B in Fig. 5, Fig. 7 is an enlarged sectional view taken along the line C-C in Fig. 5, and Fig. 8 is an enlarged vertical sectional view showing the lower part of Fig. 5. It is a diagram. In the figure, 1 is an anchor rod, 2 is a support stand, and 3
is an anchor pipe, 4 is bridge concrete, 5 is a pedestal body, 6 is a fitting cylinder, 7 is a sliding layer, 8 is a sliding blocking pedestal, 9 is a sliding support plate, 11 is a center holding packing, 12 is a semicircle 13 is a concave surface for fitting the anchor rod, 14 is a central support portion, 15 is an inwardly projecting arcuate portion, and 19 is a space for allowing movement of the anchor rod.

Claims (1)

[Scope of utility model registration request] The lower part of the vertical anchor rod 1 is fixed to the support base 2, the anchor pipe 3 having a cross section that is elongated in the longitudinal direction of the bridge is embedded and fixed in the bridge concrete 4, and the upper part of the anchor rod 1 is fixed to the anchor pipe 3. In an anchor device for restricting bridge movement that is inserted into the longitudinal middle part of a bridge, a cradle body 5 made of an elastic material is provided at the lower end of an anchor pipe 3, a fitting tube 6 integrally provided on its upper surface, and a cradle. The upper part of an oval sliding blockage pedestal 8 consisting of a sliding layer 7 fixed to the lower surface of the main body 5 is fitted, and the sliding blockage pedestal 8 is fitted to a sliding support plate 9 fixed to the upper surface of the support base 2. An anchor device for restricting bridge movement, characterized in that the anchor device is mounted on a bridge.