JP3199534B2 - Tunnel structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tunnel structure constructed by connecting tension members between predetermined upper or lower segments inside a structure.

[0002]

2. Description of the Related Art In recent years, a tunnel construction method is generally known as a so-called shield construction method in which segments are sequentially joined to construct a tunnel structure behind the ground while excavating the ground with a shield machine.

[0003] Among the tunnel structures constructed by this shield method, an arcuate rectangular tunnel structure as shown in FIG. 7 is known. This bow-shaped rectangular tunnel structure 1
The upper tunnel wall 1a and the lower tunnel wall 1b formed by joining a plurality of arcuate plate-shaped segments have extremely large diameters when their curvature radius R is compared with the reference opening radius r of the tunnel space. It is built and set to be. The upper and lower portions inside the tunnel structure 1 are located between predetermined segments S1 and S2, S3 and S4.
A tie rod 2 made of a steel bar extends in the horizontal direction and is connected between the tie rods.

Normally, the tie rod 2 has a segment S1,
The connecting portions of S2, S3, and S4 (the portions indicated by the circle A in FIG. 7A) are connected by, for example, bolt connections shown in FIG. 7B. The upper and lower tunnel walls 1a and 1b constructed with a predetermined radius of curvature R or more reduce the radius of curvature by further screwing the nut 3 of FIG. Then, the tunnel structures 1a and 1b having a predetermined radius of curvature R are constructed. Here, since the connected tie rod 2 itself is given a tension, the upper and lower tunnel walls 1a,
Deformation force that increases the radius of curvature of 1b is prevented, and the structural stability of the tunnel structure 1 is enhanced.

[0005]

However, in the prior art shown in FIG. 7, the tie rod 2 and the segment S1,
The connection work with S2, S3 and S4 takes a lot of trouble and time, and there is a problem in work efficiency. Further, when the tie rod 2 is long, the bending moment increases, and a large shearing force is applied to the connecting portion of the tie rod 2, which tends to cause a problem in structural stability.

The present invention has been made in view of the above circumstances, and provides a tunnel structure capable of greatly improving the workability of connecting a tension member and a segment and improving the structural stability of the tunnel structure. The purpose is to do.

[0007]

SUMMARY OF THE INVENTION The gist of the present invention is that a tension member is connected between predetermined segments in a horizontal direction at an upper portion or a lower portion inside a structure, which is constructed by sequentially joining arc-shaped segments. The tension member is formed of a substantially rectangular flat plate having fitting projections formed continuously at both ends in the longitudinal direction thereof, and a predetermined segment connected to the tension member. On the inner wall, a fitting groove to be fitted by inserting the fitting protrusion is formed continuously in the horizontal direction,
An interval between one of the fitting protrusions at both ends of the tension member or one of the fitting grooves of the predetermined segment is formed so as to increase in width in the direction in which the tension member is inserted. It is a tunnel structure.

[0008]

According to the tunnel structure of the present invention, the distance between one of the fitting projections formed at both ends of the tension member or the fitting groove of a predetermined segment connected to the tension member is set to As it is formed so that it becomes wider as it goes in the insertion direction of the tension member,
The connection work between the tension member and the predetermined segment is completed only by inserting the fitting protrusion of the tension member into the fitting groove. In addition, since the tension member is always given a tension, a deformation force such that the radius of curvature of the constructed tunnel structure is increased is prevented, and the structural stability of the tunnel structure is reliably increased.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described in detail with reference to FIGS. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in the present embodiment are not intended to limit the scope of the present invention only to them unless otherwise specified. , Are merely illustrative examples.

Each arc-shaped segment which is a component of the tunnel structure 5 shown in FIG. 1 is made of precast concrete in which a reinforcing bar is arranged (not shown). In this embodiment, a tension member 6 described later is used without using the tie rod 2 of the related art, and is connected between the connection segments (predetermined segments) NS2 and NS8 or between the connection segments NS4 and NS6. ing.

As shown in FIG. 2, a T-shaped groove (fitting groove) extends in the inner wall 7 of the connecting segments NS2, NS8, NS4, NS6 to which the tension member 6 is connected.
8 and the connecting segments NS2,
The interval from one end 8a to the other end 8b of the T-shaped grooves 8, 8 facing each other between NS8 (or between the connection segments NS4, NS6) is formed in parallel so as to always be L1 (FIG. 3).

On the other hand, the tension member 6, which fits into the T-shaped grooves 8, 8, is formed of a steel material.
As shown in (a), the shape is formed in a trapezoidal shape in plan view such that the width gradually increases from one end 6a set to L2 (L1> L2) to the other end 6b (dimension of L1). I have. At both ends in the longitudinal direction of the tension member 6, T-shaped protrusions (fitting protrusions) 9, 9 are formed continuously from one end side 6a to the other end side 6b, and from the other end side 6b. Between connecting segments NS2 and NS8 (or connecting segment N
(Between S4 and NS6) T-groove 8
The entire area of the character projection 9 is fitted.

Here, the dimension L1 is between the connecting segments NS2 and NS8 (or the connecting segments NS4 and NS6) when the tunnel structure 5 is formed with a predetermined radius of curvature R or more.
The T-shaped grooves 8 are set at intervals between the connecting segments NS2 and NS8 when the tunnel structure 5 is formed with a predetermined radius of curvature R (or the connecting segment NS2). The interval between the T-shaped grooves 8, 8 between NS4 and NS6) is set to be the same.

The connecting segments NS2, NS8,
In order to construct the tunnel structure 5 using the NS4 and NS6 and the tension member 6, first, one end side between the connecting segments NS2 and NS8 (or between the connecting segments NS4 and NS6) having an interval L1. The T-shaped protrusion 9 of the tension member 6 is gradually inserted into each T-shaped groove 8a with the other end 6b as a tip. Then, the T
When the character protrusion 9 is inserted up to the one end 6a, the one end 6
Since the interval between the T-shaped protrusions 9 and 9a is narrow, the connecting segments NS2 and NS8 (or the connecting segments NS4 and NS6) are close to each other, and the radius of curvature is reduced. As shown in FIG. 1, a tunnel structure 5 having a predetermined radius of curvature R is constructed. In addition, since the tension member 6 in which the entire area of the T-shaped protrusion 9 is inserted into the T-shaped groove 8 of each connecting segment is constantly applied with tension, the radius of curvature of the constructed tunnel structure 5 is increased. Such a deformation force is prevented, and the structural stability of the tunnel structure 5 is reliably increased.

Next, FIGS. 5 and 6 show a second embodiment of the present invention, and the same components as those shown in FIGS. 1 to 4 are denoted by the same reference numerals. The description is omitted.

The connecting segments NS2, NS8, NS4, N
The T-shaped groove (fitting groove) 8 formed in the inner wall 7 of S6 is L1
Is formed so as to gradually increase in width from one end 8a set to the size of the other end 8b to the other end 8b.
The spacing between the grooves 8 is L3 (L3> L1). Here, the dimension L1 is between the connecting segments NS2 and NS8 (or the connecting segments NS4, NS4) when the tunnel structure 5 is formed with a predetermined radius of curvature R or more, as in the case shown in FIGS. NS6 (between NS6), while the dimension L3 is the connection segment NS when the tunnel structure 5 is formed with a predetermined radius of curvature R.
2, between NS8 (or between the connected segments NS4 and NS6)
Are set to be the same as the interval between the T-shaped grooves 8.

The tension member 6, which is fitted to the T-shaped grooves 8, 8, is formed in a rectangular shape so that the distance from one end 6a to the other end 6b is always L1.

The connecting segments NS2, NS8,
In order to construct the tunnel structure 5 using the NS4 and NS6 and the tension member 6, first, one end side between the connecting segments NS2 and NS8 (or between the connecting segments NS4 and NS6) having an interval L1. The T-shaped protrusion 9 of the tension member 6 is gradually inserted into each of the T-shaped grooves 8a with the other end 6b as a tip. Then, the T
When the character projection 9 is inserted to one end 6a, the other end 8
Since the interval between the T-shaped grooves 8, 8 of b is wide (L3), the connecting segments NS2, NS8 (or the connecting segments NS4, NS6) are close to each other and the radius of curvature is reduced, As shown in FIG. 1, a tunnel structure 5 having a predetermined radius of curvature R is constructed. Also, as shown in FIGS. 1 to 4, the tension member 6 in which the entire area of the T-shaped protrusion 9 is inserted into the T-shaped groove 8 of each connecting segment.
Is always applied with a tension, so that a deformation force such that the radius of curvature of the constructed tunnel structure 5 is increased is prevented, and the structural stability of the tunnel structure 5 is reliably increased.

The shape and the number of segments shown in the drawings are not intended to limit the scope of the present invention.
Further, although the description has been made using the concrete segment, the same operation and effect can be obtained by using the steel segment.

[0020]

As described above, according to the tunnel structure of the present invention, the fitting projections formed at both ends of the tension member or the fitting grooves of the predetermined segment connected to the tension member are formed. Is formed so as to become wider as it goes in the insertion direction of the tension member, so that only the fitting protrusion of the tension member is inserted into the fitting groove, as in the prior art. The connection work between the tension member and the predetermined segment is completed in a short time without performing the bolt connection work between the tie rod and the segment. Therefore, it is possible to provide a tunnel structure that can greatly improve the connection workability between the tension member and the segment and increase the structural stability of the tunnel structure.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a tunnel structure of the present invention.

FIG. 2 is a perspective view showing a connection structure between a predetermined segment formed with a fitting groove and another segment according to the present invention.

FIG. 3 is a view of the first embodiment showing the connection structure of the segments shown in FIG. 2 from the inner wall side.

FIG. 4 is a view of a first embodiment showing a tension member according to the present invention.

FIG. 5 is a second view showing the connection structure of the segments from the inner wall side.
FIG.

FIG. 6 is a view of a second embodiment showing a tension member according to the present invention.

FIG. 7 is a view showing a conventional tunnel structure.

[Explanation of symbols]

Reference Signs List 5 Tunnel structure (bow-shaped rectangular tunnel structure) 6 Tension member 6a One end of tension member 6b The other end of tension member 7 Inner wall 8 T-shaped groove (fitting groove) 8a One end of T-shaped groove 8b T-shaped groove 9 T-shaped protrusion (fitting protrusion) NS1, NS2, NS3, NS4 Connecting segment (segment)

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) E21D 11/08 E21D 11/04

Claims (1)

(57) [Claims] 1. A tunnel structure which is constructed by sequentially joining arc-shaped plate segments, and in which a tension member is connected between predetermined segments in a horizontal direction at an upper portion or a lower portion inside the structure, The tension member is formed of a substantially rectangular flat plate having fitting protrusions formed continuously at both ends in the longitudinal direction thereof. The inner wall of a predetermined segment connected to the tension member has the fitting protrusion. The fitting groove to be fitted is formed continuously in the horizontal direction by inserting the portion, and the fitting protrusions at both ends of the tension member or between the fitting grooves of the predetermined segment are formed. The tunnel structure according to any one of claims 1 to 3, wherein one of the gaps is formed so as to become wider as it goes in a direction in which the tension member is inserted.