JPH0772475B2 - Shield segment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a shield segment for a large-section tunnel, and more particularly to a shield segment forming a confluence of partitioning segments assembled in the tunnel.

<Prior art> Currently, the maximum excavation diameter of circular tunnels is limited to about 15 m to 20 m, and when excavating tunnels with large cross-sections that exceed this limit, part of multiple circular tunnels should be overlapped. Methods of drilling are known.

For example, as shown in FIG. 4, when partitioning four tunnel spaces A to D in an outer shell segment a forming an outer shell of a tunnel, temporary or permanent installation is performed at the center of the outer shell segment a. It is necessary to arrange the cross-shaped or T-shaped intersection segment b.

<Problems to be Solved by the Present Invention> The above-described conventional intersection segment has the following problems.

<a> One segment b for intersection is a heavy object,
Moreover, because of the different shape of the outer shell segment a and the like, a special erector device is required for assembly.

<B> The assembling work of the intersection segment b is complicated.

<C> When a part of the segment segment c forming the tunnel spaces A to D is removed to expand the space, the joint portion of the intersection segment b projects into the expanded space and becomes an obstacle.

<Object of the Present Invention> The present invention has been made to solve the above problems, and an object thereof is to provide the following shield segment.

<a> A shield segment that is lightweight and easy to handle.

<B> A shield segment that does not require a special erector device for assembly.

<C> When expanding the tunnel space, a shield segment that does not create an extra protrusion in the expansion space.

<D> A shield segment that is easy to manufacture.

<Structure of the Present Invention> An embodiment of the present invention will be described below with reference to the drawings.

<A> Intersection Segment The shield segment according to the present invention is an intersection segment 1 that forms an intersection where the partition segments intersect.

An example of the intersection segment 1 is shown in FIG.

The intersection segment 1 is composed of two divided bodies 2, 2.

<B> Divided body Since the divided bodies 2 and 2 have the same shape, one of them will be described.

The split body 2 has two arms, a short arm 2a and a long arm 2b, each having a different projecting length, and an inclined joint surface 2c on the back side of the confluence of these arms 2a, 2b.

The short arm 2a and the long arm 2b are located in orthogonal directions.

Then, the inclined joint surfaces 2c, 2c of these two divided bodies 2, 2
Are butt-joined to each other to obtain a cross-shaped segment 1 having a vertically or horizontally long cross shape.

The intersection segment 1 is made of steel or concrete, and a bolt hole for fastening it to another adjacent segment with a fastening bolt is provided in the peripheral portion thereof.

<Operation> Next, a method of assembling a tunnel having four tunnel spaces A to D will be described with reference to FIGS.

<A> Assembly of outer shell segment A known curved arc plate-shaped outer shell segment 3 is assembled in the pit after excavation.

When assembling the outer shell segment 3, it is the same as the conventional one in which the positions of the joint portions of the adjacent outer shell segments 3 are not aligned in a straight line but are displaced in the circumferential direction of the tunnel. .

To shift the joining position of the outer shell segment 3, for example, the segments 7a and 7b having different lengths may be alternately used.

<B> Partition in Tunnel Subsequently, four partition segments 4a to 4d and an intersection segment 1 are assembled in the vertical and horizontal directions in the outer shell segment 3 to extend the tunnel spaces A to D.

That is, in the outer shell segment 3, the partition segment 4a for partitioning the tunnel spaces B and C is built.

One arm of the divided body 2, for example, the long arm 2b is mounted in contact with the top of the partitioning segment 4a built in the vertical direction.

A tunnel space C is formed by horizontally laying another partition segment 4b between the short arm 2a of the divided body 2 and the outer shell segment 3.

Next, in the divided body 2 connected to the partitioning segments 4a and 4b,
After mounting the inclined joint surfaces 2c of the other divided bodies 2 facing each other, they are integrated by using a through bolt or the like (not shown) to form the intersection segment 1.

Then, the segment segments 4c, 4d are connected to the respective arms 2a, 2b of the division body 2 located on the upper side to form the tunnel spaces A, B, D.

When assembling the intersection segment 1, as shown in FIG. 1, the intersection segment 1 previously assembled and the respective divided bodies 2 and 2 are alternately turned so that the joining directions are not the same.

The orientation of the intersection segment 1 is alternately changed because the joint positions of the arms 2a and 2b of the intersection segment 1 and the partition segment 4 are not aligned on the same line.

It is generally known to use segments of different lengths as a method of shifting the circumferential joining positions of the segments assembled along the tunnel direction. Segment 1
The joining positions of the segments are shifted by alternately changing the joining directions of the divided bodies 2 and 2 constituting the above.

<Other Example 1> The tunnel spaces having different areas may be divided into two by using only one of the divided bodies 2 constituting the intersection segment 1 described in the above examples.

In this case, when assembled without changing the direction of the inclined joint surface 2c of each adjacent divided body 2, only the inclined joint surface 2c of the divided body 2 is exposed in the tunnel space having a large area. No protrusions are produced.

In FIG. 2, partitioning segments 4a and 4c and intersection segment 1 may be used to partition into two tunnel spaces AB and CD.

<Other Embodiment 2> In addition to the intersection segment 1 described above, an intersection segment 5 as shown in FIG. 3 may be used in combination.

This intersection segment 5 consists of two short arms of equal length.
It is composed of a divided body 6 having 6a, 6a and a divided body 6 having two long arms 6b, 6b that are longer than the short arm 6a and have the same length.

Incidentally, 6c is an inclined joint surface located on the back side of the confluence of the arms 6a, 6a, 6b, 6b.

In the present embodiment, if the above-described intersection segment 1 and the intersection segment 5 of the present embodiment are alternately arranged and used, the joint positions with the partition segment 4 are not aligned on the same line but assembled by shifting. To be

<Other Embodiment 3> In addition, although the above-described embodiment has been described for the case of having four tunnel spaces, it is needless to say that it can be used even if it has four or more tunnel spaces.

<Effects of the Present Invention> Since the present invention is as described above, the following effects can be obtained.

<A> The intersection segment consists of two divisions.

Since the weight of one divided body is remarkably lighter than that of the conventional one, a conventional device can be used without requiring a special erector device for assembly.

<B> The assembly work of the intersection segment can be easily performed.

<C> When one of the divided bodies forming the intersection segment is used alone, no extra protrusion is formed in the tunnel space as in the case of the conventional cross-shaped integrated type.

<D> When a split body composed of a combination of short and long arms is used, the segment for intersection can be formed by only one kind of the divided body.

<E> It is easier to fabricate the divided body compared to the case where the conventional cross shape is integrally molded.

[Brief description of drawings]

FIG. 1: Overall perspective view of a segment for intersection according to the present invention FIG. 2: Cross sectional view of tunnel crossing direction in which the segment for intersection according to the present invention is assembled FIG. 3: Explanatory view of another segment for intersection FIG. 4: Illustration of conventional technology

Claims (3)

[Claims] 1. A segment that can be used as a part of a cross-shaped crossing portion of a segment for partitioning a tunnel, wherein two arms are positioned in a direction orthogonal to each other, and the two arms are joined together. A shield segment that has an inclined joint surface on the back side of the part. 2. A segment forming a crossing portion of a partitioning segment that divides a tunnel, wherein the short arm and the long arm are positioned in the orthogonal direction, and on the back side of the confluence portion of these both arms. A shield segment consisting of two split bodies with inclined joining surfaces. 3. A segment forming a crossing portion of a partitioning segment that partitions a tunnel, wherein the short arm and the short arm are located in the orthogonal direction, and on the back side of the confluence portion of these both arms. A shield segment comprising: a divided body having an inclined joint surface; and a divided body having a long arm and a long arm positioned in a direction orthogonal to each other and having an inclined joint surface on the back side of a confluence portion of both arms.