JPS5837444B2 - Sleeper fixing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for fixing concrete sleepers on a track.

When installing concrete sleepers on a foundation made of concrete floor slabs, a proposed method is to place anchor reinforcing bars protruding from the bottom of the concrete sleepers, and then pour concrete so that the anchor reinforcing bars are buried between the foundation and the concrete sleepers. It was done.

However, with this method, while the concrete is still uncured, the sleepers may move due to the expansion and contraction caused by temperature changes in the rail, resulting in the edges of the sleepers and concrete being torn.Also, the anchor reinforcing bars are not sufficiently anchored, causing trains on the rails to move. Vibration may cause the edge of the sleeper and concrete to break.

When the edge break occurs, severe vibration occurs when a live load such as a train load is applied, and the edge break expands due to the repeated load.

However, once it starts working, it is difficult to stop using it for a long time and it is difficult to repair it.

This invention was developed to solve the above problems.
The lower part of the sleeper and anchor bolts are buried in cast-in-place concrete, and after the concrete has hardened, the nuts of the anchor bolts are tightened and the sleepers and concrete are brought into close contact again to integrate the two, thereby preventing edge separation. It's something I wanted to do.

The present invention will be explained below with reference to illustrated embodiments.

The sleeper 1 is made of precast concrete, and bolt insertion holes 2 are provided at both ends in the longitudinal direction in the form of hollow holes that pass through the top and bottom, and a recess 3 for mounting the rail 11 is provided in the middle part. It is set up at regular intervals.

The anchor bolt 4 is inserted into the bolt insertion hole 2 of the sleeper 1, and the nut 6 is screwed onto the upper end threaded portion 5 of the anchor bolt 4 on the upper surface of the sleeper 1 to lock the anchor bolt 4.

Next, the sleepers 1 are installed at a predetermined height position on the concrete slab 7 that will serve as the foundation of the track, and then concrete 8 is placed on the concrete slab 7 to bury the lower part of the sleeper 1 and the anchor ports 4.

After the concrete 8 hardens, the nut 6 screwed onto the upper end of the anchor port 4 is tightened.

At this time, a spring washer 9 or the like is inserted between the nut 6 and the upper surface of the sleeper 1 to prevent the nut 6 from loosening due to vibration or the like.

In addition, the reference numeral 1' shown in FIG. 4 is a concrete short sleeper, and in this case as well, like the long sleeper 1, bolt insertion holes 2 are provided, and anchor bolts 4 are inserted into these and fixed. It has become.

As shown in Fig. 5, the anchor bolt 4 is configured to improve the adhesion of concrete 8 and prevent it from being pulled out.A plate-like piece 10 is fixed to the lower end of 4a, and 4b is a deformed reinforcing bar. 4c is shaped like a hook.

Note that deformed reinforcing bars may be used as the material for any of the anchor bolts, which further improves the adhesion of the concrete 8.

Further, asphalt or the like is applied downward from the upper end of the anchor bolt 4 to at least a portion exceeding the thickness of the sleeper 1 to prevent concrete from adhering, that is, to make it bondless.

As mentioned above, this invention first attaches anchor bolts to sleepers,
The sleeper was inserted and locked, the sleeper was installed at the specified height, cast-in-place concrete was poured, the lower part of the sleeper and the anchor bolt were buried and fixed, and after the concrete had hardened, it was screwed again to the upper end of the anchor bolt. By tightening the nuts, the sleepers are pressed against the concrete and are brought into close contact and integrated, so the sleepers are completely fixed in the concrete and can prevent edge breakage.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional view showing the fixed state of the sleeper, Fig. 2 is a longitudinal sectional view seen from the side, and Fig. 3 is a perspective view showing the long sleeper.
FIG. 4 is a perspective view showing a short sleeper, and FIG. 5 is a perspective view showing an example of an anchor bolt. 1, 1'...Sleeper, 2, 2'...Bolt insertion hole, 3...Recess, 4...Anchor bolt, 4a to 4c... ...Anchor bolt, 5
...Threaded part, 6...Nut, 7...
... Concrete floor slab, 8 ... Concrete, 9 ... Spring washers, 10 ...
・Plate piece, 11...Rail.

Claims (1)

[Claims] 1. A rail is fixed to a recess made in a precast concrete sleeper at a predetermined spacing, and the bolt insertion hole provided at both ends of the sleeper in the longitudinal direction has a threaded portion at the upper end, and the rail is inserted downward from the upper end of the sleeper. Bondless anchor bolts coated with asphalt or the like are inserted and locked to the part that exceeds the thickness, and the sleepers are installed at a predetermined height on the concrete slab, and cast-in-place concrete is placed on the concrete slab. 1・
A method for fixing a sleeper, comprising: burying the lower part of the sleeper and the anchor bolt, and then tightening the anchor bolt with a nut K on the upper surface of the sleeper after the concrete hardens to fix the sleeper.