JPS5818518B2 - concrete segment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a concrete segment, primarily a concrete segment for tunnel lining.

And its purpose is concrete segment (hereinafter referred to as segment).

) by using cast iron fittings at the joint ends in the circumferential and width directions to increase the joint strength of adjacent segments, and to simplify the structure of the fittings.
The object of the present invention is to provide a segment that can be efficiently and easily manufactured by casting.

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

As shown in Figs. 1 to γ, a segment 1 consists of a concrete member 2 made of a precast concrete slab curved in an arc shape with a predetermined curvature, and a joint fitting 3 attached to the joint ends in the circumferential direction and width direction. , 3', a steel frame member 4 and reinforcing bars 5 buried inside the concrete member 2, and a bolt insertion hole 6 is provided in the center of the joint fitting 3.
is drilled.

A plurality of concave notches 7 are provided at predetermined intervals at the joint end in the circumferential direction and the width direction on the inner circumferential surface side of the concrete IJ-cont member 2, and the opening of the concave notch 7 opens toward the joint end surface. The joint fittings 3,
3' is attached.

Furthermore, a notch 8 is provided on the side edge of the inner peripheral surface of the concrete member so as to form a groove for filling joint material between adjacent joining ends when the segments are joined.

. The joint fittings 3, 3' at the joint ends of the concrete member 2 in the circumferential direction and/or width direction are made of cast iron.

In addition, ductile cast iron is used for the joint fittings 3 at the joint ends in the circumferential direction where relatively high stress tends to concentrate.
The other fittings 3' are preferably made of ordinary cast iron.

The steel frame member 4 consists of two parallel flat bars 9 that are curved with the same curvature as the concrete member 2 and vertically opposed to each other, and spacing members 10 that are installed between them at intervals in the length direction of the steel frame member 4. A joint fitting 3 at a circumferential joint end is fixed to both ends thereof by welding via an anchor reinforcing bar 11 and an auxiliary reinforcing bar 12.

It is preferable that the tip of the auxiliary reinforcing bar 12 is bent into a hook shape, and the bent part is engaged with the anchor reinforcing bar 11 and welded.

The joint fittings 3, 3' are of the form shown in FIGS. 8 to 10.

In FIG. 8, the joint fitting 3a is a main body portion 13 having a concave cross section.
and a mounting plate 14 protruding from both sides thereof, and is formed by casting.

Two insertion holes 15 are bored in the mounting plate 14 as mounting means, and the U-shaped anchor reinforcing bars 11a are inserted through these holes to lock and fix the U-shaped portion to the mounting plate.

A joint fitting 3b shown in FIG. 9 has the body portion 13 of the fitting 3a formed into a concave shape with a substantially trapezoidal cross section.

The joint fitting 3c in FIG. 10 has a raised protrusion so that the inner surface of the bent portion of the U-shaped anchor reinforcing bar 11a is attached to the front surface between the insertion holes 15 that serve as attachment means for the attachment plate 14 of 3a or 3b. 16.

Note that the anchor reinforcing bars 11, 11aLt round steel, deformed reinforcing bars, or flat steel plates may be used.

In the above configuration, when molding segment 1,
After the steel frame members 4 and reinforcing bars 5 are assembled in advance and the joint fittings 3 are attached, are they placed in the formwork?

Alternatively, they are connected and assembled within the formwork, and reinforced by attaching reinforcing bars, wire mesh plates 23, etc. as necessary.

Next, it is filled with mortar and concrete and removed from the mold after hardening.

When lining tunnels, etc., as shown in Figure 11,
The joints are sequentially joined along the inner peripheral surface of the tunnel.

When joining, as shown in FIGS. 12 and 13, the bolts 19 are integrally inserted into the □ bolt insertion holes 6 of the joint fittings 3, 3 at the opposing circumferential and width direction joining ends, respectively, and the Conclude at 20.

Next, a joint material 2 is placed in the groove 21 formed between each joint end.
2 and complete the construction.

This invention has the above-mentioned configuration, and by using cast iron fittings as fittings for concrete segments, it is possible to increase the joint strength of the segments at the time of joining, and also improve the efficiency of segment manufacturing. be able to.

In other words, cast iron fittings do not need to be formed by assembling steel plates by welding as in the past, and can be formed in one piece in advance, resulting in high tonality. Since the labor required for casting can be reduced, efficiency can only be improved.
Since the attachment means is provided on the attachment plate, the anchor reinforcement can be easily attached.

Incidentally, the segment of the present invention can be used as a humid pipe or other members for constructing underground structures.

[Brief explanation of the drawing]

Fig. 1 is an overall perspective view showing the structure of the segment, Fig. 2 is a front half-sectional view showing cast iron fittings attached to the circumferential and widthwise joint ends of the segment, and Fig. 3 is a planar half-sectional view of the segment. 4 is a front half-sectional view showing a state in which cast iron fittings are attached only to the circumferential joint end and ordinary steel fittings are attached to the other parts, and FIG. 5 is a half-sectional plan view thereof. 6
The figure is a partially enlarged view showing the mounting state of the joint fittings, FIG. 7 is a partially enlarged needle perspective view showing the mounting state of the joint fittings and the structure of the steel frame member, and FIGS. 8' to 10 show examples of the joint fittings. Fig. 11 is an elevation view showing the joined state of the segments, Fig. 12 is a partially enlarged view thereof, Fig. 13 is a perspective view and a cross-sectional view.
The figure is a perspective view thereof. 1... Segment, 2... Concrete member, 3... Cast iron fittings, 3'...
・Ordinary steel fittings, 4... Steel members, 5...
...Reinforcing bar, 6...Bolt insertion hole, 7...
... recessed part, 8 ... notch part, 9 ... flat steel, 10 ... spacing member, 11. Ila...
... Anchor reinforcing bar, 12... Auxiliary reinforcing bar, 13
...Body part, 13'...Both sides, 14
......-Mounting plate, 15...Insertion hole, 16.
...Protrusion, 17... Engagement notch, 18.
...Wire mesh plate, 19...Bolt, 20...
... Nut, 21 ... Concave groove, 22 ...
・Glut material.

Claims (1)

[Scope of Claims] 1. A concave notch is provided at the joint end on the inner peripheral surface side of a concrete member curved in an arc shape, and a concave notch on the joint end side has openings on both sides of the main body having a concave cross section. A cast iron fitting with a mounting plate protruding outward from the edge of the surface is arranged so that the center of the main body portion having a bolt insertion hole is flush with the joint end surface, and the mounting plate of the fitting is attached to the concrete. When embedding the anchor in the mounting plate (U1
A concrete segment characterized by having a letter-shaped part fixed to a mounting plate and a fixed joint fitting. 2. A joint fitting made of ductile cast iron is attached to the concave notch at the circumferential joint end of the concrete IJ-cont member, and a joint fitting made of ordinary cast iron is attached to the concave notch at the width direction joint end. A concrete segment according to claim 1.