JPH06123200A - Concrete segment with mortise for shield tunnel - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] Reinforce the tenon portion of the tenon concrete segment used for the shield construction method to facilitate manufacturing. [Structure] Convex ridges of mutually fitting shape provided on the axial side joint surface of a concrete segment and concave grooves are provided integrally with anti-axial force reinforcing portions 17a, 18a and shear force reinforcing portions 17b, 18b, and on the rear surface. The convex strip outer surface protective plate 17 and the concave groove inner surface protective plate 18 provided with the concrete reinforcing material also serving as an anchor are fixed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tenoned concrete segment used in tunnel construction by a shield construction method.

[0002]

2. Description of the Related Art Conventionally, in a tunnel construction by a shield construction method, an arc-shaped concrete segment having a shape in which a circular ring is divided into a plurality of pieces has been used, and a method of assembling this in a circular shape on a tunnel inner surface to form a primary lining is widely used. Has been adopted.

Conventional concrete segments have been used in which both the joint surfaces on the axial side and the circumferential side are formed flat, but in recent years, the purpose is to improve the waterproofness and the integrity between the segments. Since then, a concrete segment with mortise has been developed in which a ridge and a groove which are fitted to each other on the joint surface are integrally provided.

When the conventional tenon segment is assembled on the inner surface of the tunnel and then lining, a load is applied in the axial direction to receive a reaction force for propelling the shield machine, fluctuations in the ground and tunnels. Shear force is applied by the internal load. These loads are mainly applied to the fitting portion between the ridge and the groove. Therefore, the concrete reinforcement of these parts has been conventionally performed by incorporating a reinforcing bar into concrete.

[0005]

In the conventional tenon segment described above, a lot of labor and time are required because the reinforcement bars of the ridges and the groove portions must be assembled by hand at the time of molding. Moreover, since the concrete surface of the ridge and the groove is exposed, there is a problem that they are easily chipped.

In view of such conventional problems, the present invention has an object of providing a concrete segment with a tenon for a shield tunnel which facilitates the production of the segment and can obtain a high-strength ridge and groove. .

[0007]

The features of the present invention for solving the above-mentioned conventional problems and achieving the intended purpose are as follows.
A groove having a trapezoidal cross section is provided on one joint surface of the arc-shaped segment main body that constitutes a part of a circular ring on the ring axial direction side, and the groove is fitted on the other joint surface. In a concrete segment with a mortise for a shield tunnel, comprising an axial force reinforcement portion fixed to the outer surface of the top of the trapezoidal cross section on the outer surface of the ridge of the one axial side joint surface, and inclined portions on both sides of the trapezoidal cross section top The anti-shear force reinforcing portion fixed to the outer surface is fixed to the convex outer surface protection plate integrally formed with a steel plate material, and the opposite axial force of the convex rib is applied to the inner surface of the concave groove of the other axial joint surface. The anti-axial force reinforcement part corresponding to the reinforcement part and the anti-shear force reinforcement part corresponding to the above-mentioned anti-shear force reinforcement part are integrally molded with the steel plate material, and the concave groove inner surface protection plate is fixed, and each back plate of each reinforcement plate is fixed. In that embedded in the segment body projecting integrally concrete reinforcement anchoring anchor serves for.

[0008]

In the production of the tenon segment of the present invention, a concrete reinforcing material that also serves as an anchor, such as a reinforcing bar or a steel plate material, can be previously integrated on the back surface of each protective plate. By fixing the inner surface of the segment with screws or the like, the segment can be integrated at a predetermined position and the concrete can be reinforced in the vicinity at the same time.

A load in the axial direction is received by the anti-axial force reinforcing portion, and a shear force is received by the anti-shear force reinforcing portions on both sides thereof, so that the ridges and groove are not damaged.

[0010]

Embodiments of the present invention will now be described with reference to the drawings.

In the drawing, 10 is a concrete segment with a tenon according to the present invention, which is formed into a shape in which a circular ring is divided into a plurality of parts. As shown in FIG. The lining is sequentially extended while assembling it in a circular shape using 11b.

Each segment 10 has its width direction, that is,
The ridge 13 is integrally formed on one of the axial-side joining surfaces 12a and 12b, and the groove 14 is integrally formed on the other. Also segment 1
On all joint surfaces around 0, a groove 15 for a sealing material is formed continuously in a ring shape, and a rubber sealing material 16 is fitted therein to join the respective segments 10 to each other. ing.

The ridge 13 has a trapezoidal cross section with both sides of the top surface inclined, and the groove 14 has a bottom surface and an inclined surface corresponding thereto. A convex outer surface protection plate 17 is integrally fixed to the outer surface of the convex shape 13, and a concave groove inner surface protection plate 18 is integrally fixed to the inner surface of the concave groove 14.

The ridge outer surface protection plate 17 is wholly integrally formed from a steel plate, and has an anti-axial force reinforcing portion 17a for covering the outside of the top surface of the ridge 13 and a shear force reinforcing portion 17b, 1 for covering the inclined surface.
7b and 1b are bent and formed with a single plate material.
A concrete reinforcing bar 19 also serving as an anchor is provided on the rear surface of the reinforcing plate 2 and a reinforcing plate 2 made of a steel plate.
0 is provided so as to straddle each part 17a, 17b, 17b.

The concave groove protection plate 18 is provided with an anti-axial force reinforcing portion 18a and anti-shear force reinforcing portions 18b, 18b corresponding to the respective portions 17a, 17b, 17b of the convex line protective plate 17 in a direction facing them. A single metal plate is formed by bending, and integrally has it. On the back surface, a reinforcing plate 22 made up of an anchor / concrete concrete reinforcing bar 21 and a steel plate is projected so as to straddle each part 18a, 18b, 18b. There is.

Further, screw holes 23 are formed at various positions on the front surface side of both the protection plates 17 and 18, so that they are bolted to the inner surface of the segment molding frame.

The segment 10 thus constructed is manufactured by fixing the respective protection plates 17 and 18 to the inner surface of the side plate of the concrete forming frame with bolts from the side plate side, and then placing concrete in the form. Installed and reinforcement bars 19,2
1 and the reinforcing plates 20 and 22 are embedded in the segment body. In this state, it is solidified, the bolt is removed, and then the mold is removed.

The segment 10 molded in this way
1 is used, as shown in FIG. 1, between the adjacent segments 10 and 10 in the axial direction, both protection plates 17 and 1 are
8 are connected to each other in a state of being fitted to each other.

In the above embodiment, both protection plates 1 are used.
Although a plurality of joints 7 and 18 are fixed to each joint surface 12a and 12b, one joint member having a length over the entire length may be used for each joint surface 12a and 12b.

[0020]

As described above, according to the tenon segment for a shield tunnel of the present invention, the ridge forming the tenon and the groove into which the ridge fits are integrated with the axial force reinforcing portion and the shear force reinforcing portion, respectively. By installing a protective plate on the back of it, a concrete reinforcing material that also serves as an anchor is projected on the back of it, and by embedding this in the segment body, it is easy to incorporate the concrete reinforcing material around the ridges and grooves. Therefore, both the inner and outer surfaces are reinforced, the joint is not damaged, and the strength is increased.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a joint portion of a concrete segment according to the present invention.

FIG. 2 is a plan view of the concrete segment of the above.

FIG. 3 is a side view of the same.

FIG. 4 is an enlarged cross-sectional view taken along the line AA in FIG.

FIG. 5 is a front view showing a segment assembled state.

FIG. 6 is a front view showing a ridge portion side protection plate.

FIG. 7 is a side view of the above.

FIG. 8 is a rear view of the above.

FIG. 9 is a front view showing a concave groove side protection plate.

FIG. 10 is a side view of the above.

FIG. 11 is a rear view of the above.

[Explanation of symbols]

 10 Mortise-added concrete segment 11a, 11b Coupling metal fittings 12a, 12b Axial side joint surface 13 Convex ridge 14 Recessed groove 15 Seal material recessed groove 16 Rubber seal material 17 Convex ridge outer surface protection plate 17a, 18a Anti axial force reinforcing portion 17b , 18b Anti-shear force reinforcing portion 18 Recessed groove protection plate 19 Concrete reinforcing bar 20 Reinforcing plate 21 Anchor / concrete reinforcing bar 22 Reinforcing plate 23 Screw hole

Claims (1)

[Claims] 1. A convex strip having a trapezoidal cross section is provided on one joint surface on the axial side of the ring of an arc-shaped segment main body forming a part of a circular ring, and the convex strip is formed on the other joint surface. In a concrete segment with a tenon for a shield tunnel, which comprises a concave groove to be fitted with, an axial force reinforcing portion fixed to an outer surface of a top portion of a trapezoidal cross section on an outer surface of a ridge of the one axial side joint surface, and the trapezoidal cross section. The anti-shearing force reinforcing portion fixed to the outer surface of the inclined portion on both sides of the top portion is fixed to the convex outer surface protection plate integrally molded with a steel plate material, and the convex portion is formed on the inner surface of the concave groove of the other axial joint surface. The inner surface protection plate of the groove is formed by integrally forming the anti-axial force reinforcing portion corresponding to the anti-axial force reinforcing portion of the strip and the anti-shear force reinforcing portion corresponding to the anti-shear force reinforcing portion with the steel plate member, and each reinforcing plate of Concrete segments with mortises for shield tunnels, in which a concrete reinforcing material that also serves as a fixed anchor is integrally projected on the back of each and embedded in the segment body.