JPS6027200Y2 - Reinforcement structure for bent bolt holes in concrete segments - Google Patents

Description

[Detailed description of the invention] This invention relates to a reinforcement structure for a bent bolt insertion hole in a concrete segment.

As the name suggests, the concrete segment is shaped into a sector (arc).

Therefore, in terms of workability, it is most convenient to connect concrete segments of this shape to each other in the circumferential direction using bent bolts, and today, connections using bent bolts are beginning to replace connections using straight bolts. .

However, in the conventional connection using bent bolts, as shown in FIG. 1, the insertion hole 3 for the bent bolt 2 is provided directly in the concrete segment 1, and the inner wall surface of the insertion hole 3 is not reinforced in any way. It has not been done yet.

Therefore, when tightening is performed using an impact wrench or the like, for example, it is difficult to tighten strongly.

In such a case, the bent bolt 2 tends to straighten and presses the inner curved wall portion 3a of the insertion hole 3 outward strongly, resulting in damage to this portion.

This idea was made in view of the above circumstances, and its purpose is to embed a reinforcing metal fitting for a hole for inserting a bent bolt, which has a hollow part for inserting a bent bolt inside and a spiral flange on the outer periphery. It is an object of the present invention to provide a reinforcement structure for a bent bolt insertion hole in a concrete segment, thereby preventing cracks and destruction from occurring in the inner curved wall of the insertion hole.

An embodiment of this invention will be described in detail below based on the drawings.

FIG. 2 is an enlarged view of the main part of the bending bolt insertion hole reinforcement structure of the concrete segment according to this invention.

In the figure, the reference numeral 5 indicates a concrete segment, and a joint hole 6 is provided in the inner curvature of the concrete segment 5.

A reinforcing metal fitting 10 having a length that corresponds to the entire length between the two is buried between the joint hole 6 and the end surface.

As shown in FIG. 3, this reinforcing metal fitting 10 includes a cylindrical portion 10b having a hollow portion with a predetermined curvature, that is, a hole 10a for inserting the bent bolt 8, and a radius from the outer periphery of the cylindrical portion 10b. One flange 1 that protrudes outward in the direction and extends continuously in a spiral shape along the longitudinal direction of the cylindrical portion 10b.
0c.

Note that the amount of radial outward protrusion of the flange 10b of the reinforcing metal fitting 10 is appropriately determined in consideration of the thickness of the segment 5, etc., but in the illustrated example, the amount of protrusion in the inner groove direction is small and the amount of protrusion is large in the outer groove direction. It is made to stand out.

The operation of the bent bolt insertion hole reinforcing structure having the above configuration will be explained below.

When connecting the concrete segments 5, 5, the bent bolt 8 is tightened with an impact wrench, etc.
A force acts on the member to cause it to extend in the direction of arrow A in the figure, that is, in a straight line.

This force is concentrated along the inner wall of the concrete segments 5, 5 via the reinforcing metal fittings 10, and when this force increases beyond a certain level, the inner wall is eventually pushed outward and destroyed.

However, in this invention, a flange 10c is provided on the outer periphery of the cylindrical portion 10b of the reinforcing metal fitting 10, and the flange 10c is continuously extended in a viral shape along the longitudinal direction of the cylindrical portion 10b, so that the force in the direction of the arrow A is dispersed by the flange 10c. This prevents the reinforcing metal from being concentrated along the inner wall of the reinforcing metal fitting 10.

The inner walls of the concrete segments 5, 5 are thus protected from bulging failure.

In addition, when the reinforcing metal fitting is molded from ductile, ribs remain on both ends of the hollow portion, so if these are used, the thickness of the cylindrical wall of the reinforcing metal fitting can be made thinner, and the molding process can be carried out smoothly.

In addition, since the above structure allows the space within the hollow portion to be set wide, it can be effectively used as play when inserting the bent bolt, thereby facilitating smooth insertion.

Further, in the above embodiment, the end face of the reinforcing metal fitting for the bent bolt insertion hole is configured to be flush with the end face of the segment. When connecting the segments, the ends of the metal fittings of adjacent segments may be configured to fit together, and this configuration is advantageous because the connection position of each segment can be extremely smoothly achieved. .

Since this invention has the above-mentioned structure and function, it is possible to prevent the destruction and cracking of the inner groove wall of the joint part, which is peculiar to concrete segments using bent bolts, and to strengthen the strength of the segment itself. I can do it.

In addition, the connection can be made strong, and there is no need to worry about breaking or cracking when tightening bolts, so the work can be done extremely smoothly, which has practical effects.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional view showing the connection state of concrete segments using conventional bent bolts, Fig. 2 is an enlarged view of the main parts showing the bent bolt insertion hole reinforcement structure according to this invention, and Fig. 3
The figure is a perspective view of the reinforcing metal fitting. 5... Concrete segment, death...
Bent bolt, 10...Bent bolt insertion hole reinforcement fitting, 10a...Bolt insertion hole, 10b...
...B cylindrical part, 10c...Flange.

Claims (1)

[Scope of utility model registration request] An insertion hole 10 with a curvature corresponding to the bent bolt 8 to be inserted.
a cylindrical portion 10b having a radius of A reinforcing metal fitting 10 consisting of a flange 10c of
A structure for reinforcing a bent bolt insertion hole in a concrete segment, characterized in that the structure is buried along the entire length between the joint hole and the end surface of the concrete segment.