JP3079595U - Segment joint structure - Google Patents

Abstract

(57) [Problem] To provide a segment joint in which a concave portion and a convex portion provided so as to be fitted to a joint surface of a segment are not broken by jack thrust of a shield machine. SOLUTION: In a joint surface 2 of a segment 11 and a segment 12 adjacent to each other in a longitudinal direction of a tunnel 1, a sectional shape of a joint surface 2 of a trapezoidal concave portion 3 and a trapezoidal convex portion 4 of a joint surface of each segment is trapezoidal. Notch 9a at a certain corner,
9b, 10a and 10b are provided so as to fit each other.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a segment joint structure in a shield tunnel.

[0002]

[Prior art]

 Conventionally, when building railways and roads underground, structures are densely located on the ground surface in or near the city, so the surrounding environment, such as traffic obstruction and noise, is worsened by excavation. For this reason, in recent years, shield construction methods that have relatively little effect on the surrounding environment are often adopted. In the shield method, a face is excavated by a shield machine, a segment is assembled in a tail of the shield machine, and a reaction force of a propulsion jack of the shield machine is applied to the assembled segment to construct an underground structure by excavating. This is a method of constructing a shield tunnel.

[0003] Reinforced concrete segments are generally used as segments of so-called large-diameter shield tunnels of railways and roads, and bolted joint structures are used as joints thereof. The cross-sectional shape of the segment joint surface in the tunnel longitudinal direction that is continuous in the circumferential direction is such that a trapezoidal concave portion is provided on one joint surface and a trapezoidal convex portion is provided on one joint surface. There are many. The fitting of the concave and convex portions has an effect of suppressing the deformation of the segment ring.

[0004]

[Problems to be solved by the invention]

 However, in the segment joint structure, when the thrust of the propulsion jack of the shield machine is applied to the joint surface of the segment to the concave portion and the convex portion provided so as to be fitted to the segment joint surface, the joint surface of the segment is easily chipped. is there.

[0005] Furthermore, when the joint surface of the segment is chipped, it is necessary to provide waterproofing by caulking or the like, which is disadvantageous in that the cost is high.

Accordingly, the present invention has been proposed in view of the above-mentioned problems of the related art, and the joint surface of the segment is lacking even when the propulsion jack thrust of the shield machine is applied to the joint surface of the segment. It is an object of the present invention to provide a segment joint without any trouble.

[Means for Solving the Problems]

 In order to achieve the above object, in the segment joint according to the present invention, the cross-sectional shape of the segment joint surface in the tunnel circumferential direction in the tunnel circumferential direction on the segment joint surface adjacent in the longitudinal direction of the tunnel corresponds to one joint surface. Is a segment joint surface provided so that a trapezoidal convex portion is fitted to one of the joint surfaces of the trapezoidal concave portion. It is characterized in that notches are provided at corners having a trapezoidal cross-sectional shape so that they can be fitted to each other.

[0007]

[Embodiment of the invention]

 Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0008]

【Example】

 FIG. 1 is a perspective view showing the entire assembling of segments in a shield tunnel according to an embodiment of the present invention. FIG. 2 is a perspective view showing a portion of the segment 11 and the segment 12 of FIG. FIGS. 3, 4, 5, and 6 are cross-sectional views showing a portion of the segment joint section taken along the line AA in FIG. 2, but with a slight emphasis on the separation.

In this embodiment, as shown in FIGS. 1, 2, 3, 4, 5, and 6, the joint surface 2 of the segments 11 and 12 adjacent to each other in the longitudinal direction of the tunnel 1 Continuing in the circumferential direction of the tunnel 1, a trapezoidal concave portion 3 is provided on the joint surface 2 of the segment 11, and a trapezoidal convex portion 4 is provided on the joint surface 2 of the segment 12 so as to be fitted respectively. I have. The segment joint structure according to the present invention can be applied to any type of concave and convex shapes of the joint surface, but the shape of the joint surface according to this embodiment is based on a trapezoidal shape. is there.

FIG. 3 shows the shape of a segment joint surface of a conventional type. In this case, when a jack thrust 5 of the shield machine is applied to the joint surface 2 and the joint surfaces 2 of the segments 11 and 12 are pressed against each other, each of them is pressed. The corners 7c of the trapezoidal projections 4 provided so as to fit into the joint surfaces 2 of the segments described above apply a wedge-like force to the corners 6c of the trapezoidal recesses 3, and cracks 8c are formed on the joint surfaces 2. Often occurs. Similarly, a crack 8b is generated in the corner 7b by the corner 6b. In addition, a crack 8d is generated in the corner 6d of the trapezoidal concave portion 3 by the trapezoidal protrusion 7d, and a crack 8a is generated in the corner 6a by the corner 7a.

FIG. 4 is a sectional view showing the notch 10a and the notch at the corners 7b and 7c of the trapezoidal projection 4 in the joint surface 2 of the longitudinal segment 11 and the segment 12 of the tunnel 1 of the present invention. 10b is provided. In addition, the notch 9a and the notch 9b are provided at the corner 6a and the corner 6d of the trapezoidal concave portion 3. Thus, for example, the corner 7c of the trapezoidal convex portion 4 does not exert a wedge-like force on the corner 6c of the trapezoidal concave portion 3, so that the crack 8c does not occur on the joint surface 2. Similarly, the cracks 8a, 8b and 8d do not occur.

FIG. 5 is a view in which the cross-sectional shapes of the cutouts 9c, 9d, 10c and 10d of the present invention are changed to the above-mentioned triangles and are chamfered on one surface. FIG. 6 shows the semicircular concave portion 3 and convex portion 4. The notch can be made by forming the formwork when making the reinforced concrete segment.

The cutouts are provided as a pair of 9a and 10a or a pair of 9d and 10d and a pair of 9b and 10b or a pair of 9c and 10c. Since the sealing material is attached continuously in the circumferential direction of the channel, a cushioning effect can be expected, and the notched portion can be omitted on the side where the sealing material is attached. In the case of FIG. 4 as an example, when a sealing material is attached to the joint surface 2 on the corner portion 7 side, the notched portions 9a and 10a can be omitted. Also, in general, the concave and convex portions such as trapezoids are provided continuously in the circumferential direction of the tunnel, but if they are provided intermittently, the notched portions are also provided intermittently.

[0014]

[Effect of the invention]

 According to the segment joint structure according to the present invention, in the segment joint surfaces adjacent to each other in the longitudinal direction of the tunnel, the cross-sectional shape of the segment joint surface in the longitudinal direction of the tunnel continuously in the circumferential direction of the tunnel has a trapezoidal shape on one joint surface. A cross section of the segment joint surface in the tunnel longitudinal direction of the concave portion and the convex portion of each segment joint surface is provided so that a trapezoidal convex portion is provided on one joint surface of each of the concave portions. Notches are provided at the corners where the shape is trapezoidal so that they fit each other, so the corners do not directly contact the corners, so the joint surface is not chipped and water leakage does not occur. No structure can be constructed, and maintenance for water stoppage is not required, which is economical.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an entire assembly of a segment in a shield tunnel according to an embodiment of the present invention.

FIG. 2 shows segments 11 and 12 of FIG.
It is a perspective view which shows the part.

FIG. 3 is a cross-sectional view showing a portion of a segment joint portion along a cutting line AA in FIG. 2;

4 is a cross-sectional view showing a portion of a segment joint portion taken along a cutting line AA in FIG. 2;

FIG. 5 is a cross-sectional view showing a portion of a segment joint portion taken along a cutting line AA in FIG. 2;

FIG. 6 is a sectional view showing a portion of a segment joint portion taken along a cutting line AA in FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Tunnel 2 ... Joint surface 3 ... Concave part 4 ... Convex part 5 ... Jack thrust 6a ... Corner part 6b ... Corner part 6c ... Corner part 6d ... Corner part 7a ... Corner part 7b ... Corner part 7c ... Corner 7d Corner 8a Crack 8b Crack 8c Crack 8d Crack 9a Cutout 9b Cutout 9c Cutout 9d Cutout 10a Cutout 10b Cutout 10c: Notched portion 10d: Notched portion 11: Segment 12: Segment

Claims (1)

[Utility model registration claims] 1. In a segment joint surface adjacent in a longitudinal direction of a tunnel, a sectional shape of a segment joint surface in a longitudinal direction of a tunnel in a circumferential direction of a tunnel is such that a concave portion of one joint surface and a convex portion of one joint surface are respectively formed. A segment joint characterized in that a notch is provided at a corner portion of a concave portion and a convex portion of each segment joint surface in a segment joint surface provided so as to be fitted, and each segment joint is fitted. Construction.