JP2588658B2 - Hexagonal segment joining 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 joining structure of hexagonal segments forming a cylindrical wall by connecting a plurality of segments to each other.

[0002]

2. Description of the Related Art As one of methods for constructing a tunnel, there is a so-called shield method in which construction is performed while excavation and segment assembly are performed simultaneously. Conventionally, the segment used in such a shield construction method has mainly been a rectangular shape in a plan view formed in an arc-shaped cross section. However, in recent years, the tendency of tunnels to be longer and faster has been remarkable, and in order to cope with this, as shown in FIG. 5, a plurality of hexagonal segments 1, 1,. As a result, a shield construction method for constructing a tunnel by forming the tubular wall body 2 is being performed. In the shield method using such a plurality of hexagonal segments 1, 1,..., A tunnel can be formed by one kind of segment, and there is no restriction on the order of assembling the segments. There are various advantages, such as being able to apply jack thrust to the segments.

[0003]

When a new hexagonal segment 1 is assembled to the end of a cylindrical wall 2 already constructed by a plurality of hexagonal segments 1, 1,..., As shown in FIG. The recesses 4, 4 are formed on the inner surface side of the hexagonal segments 1, 1 in the vicinity of the joint, and the holes 6, 6, through which the bolts 5 can be inserted, are formed in the side walls 4a, 4a of the recesses 4, 4. Then, the bolts 5 are inserted into the holes 6, 6, and the bolts 6 and the nuts 7 fasten the side walls 4 a, 4 a of the respective recesses 4, 4 to join the hexagonal segments 1, 1. However, in such a joint structure, the hexagonal segments 1, 1
Only in the vicinity of the side of
It is difficult to secure a reliable pressure contact state between the joint surfaces 3 and 3, and it is not possible to apply a sufficient axial force to the cylindrical wall 2 already constructed, and the cylindrical wall 2 is distorted. There was a risk of being built in a state. Further, since the recess 4 is formed on the inner surface side of the hexagonal segment 1, there is a problem that the inner surface of the cylindrical wall 2 cannot be smoothed.

The present invention has been made in view of the above circumstances, and can ensure a reliable press-contact state with a hexagonal segment which is already attached to form a cylindrical wall, and has already been constructed. It is an object of the present invention to provide a joint structure of hexagonal segments that can provide a sufficient axial force in the circumferential direction of a cylindrical wall and can form a cylindrical wall having a smooth inner and outer surface.

[0005]

The joining structure of hexagonal segments according to the present invention is a joining structure of hexagonal segments forming a cylindrical wall in the axial direction of a drilled hole by connecting a plurality of them to each other, wherein the hexagonal segments, substantially parallel to the joint surface of one side end of the joint surface consisting hypotenuse, on the bonding surface of the one side portion joining the side and the other side portion adjacent to the joint surface of the A communicating bolt insertion hole is formed, and a female screw portion is formed on the joint surface on the one side, and when attaching a hexagonal segment to an end of a tubular wall already constructed, the bolt is inserted. A hexagonal segment to be attached is joined to an end of the cylindrical wall body by inserting a bolt into the insertion hole and screwing the bolt into the female screw portion of the joining surface on the one side of the already attached hexagonal segment. It is characterized by being done.

[0006]

According to the hexagonal segment joining structure of the present invention, a bolt is inserted into the bolt insertion hole of the hexagonal segment and screwed into the female screw portion of the joining surface on one side of the hexagonal segment already assembled. By joining the newly attached hexagonal segment to the end of the cylindrical wall, a reliable press-contact state between the joining surfaces of the hexagonal segments is ensured, and the pressing force at the time of joining acts in the circumferential direction Thus, an axial force is applied in the circumferential direction of the cylindrical wall already assembled. Further, by assembling the hexagonal segments, the bolt insertion holes are closed to form a cylindrical wall having smooth inner and outer surfaces.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the joining structure of hexagonal segments according to the present invention will be described below with reference to FIGS. In addition,
The same components as those of the conventional example are denoted by the same reference numerals, and description thereof is omitted.

As shown in the figure, a hexagonal segment 1 used in the present embodiment has a pair of joining surfaces 3 each having an oblique side.
a, 3b, a truncated cone-shaped convex portion 11, 11 is formed on a joint surface 3a on one side, and a joint surface 3b on the other side.
Are formed with truncated cone-shaped concave portions 12. A plurality of hexagonal segments 1, 1,...
When the members b are brought into contact with each other, the convex portion 11 formed on the joint surface 3a and the concave portion 12 formed on the joint surface 3b are fitted to each other. In addition, each hexagonal segment 1,
Are connected by continuous bolts 13, 13 in the axial direction of the excavated hole excavated by the excavator.

Each of the hexagonal segments 1, 1... Is substantially parallel to the joint surface 3a on one side thereof.
A bolt insertion hole 15 is formed so as to communicate with the joint side surface 14 adjacent to the line a and the joint surface 3b on the other side.
A straight bolt 16 is inserted into the bolt insertion hole 15. Further, a female screw portion 17 made of an insert nut or the like is provided on the joining surface 3a on one side. The bolt 16 is inserted into the bolt insertion hole 15 and provided on the joining surface 3a on one side of another hexagonal segment 1 to be joined to the joining surface 3b on the other side of the hexagonal segment 1. By screwing into the female screw portion 17, the joining surfaces 3a and 3b of the hexagonal segments 1, 1,... Are reliably positioned and joined. Next, a procedure for assembling the hexagonal segment 1 will be described. (1) First, at the end of the cylindrical wall 2, already hexagonal newly assembled into hexagonal assembled segments 1,1 ... joining side 14 and the joint surface 3a of, formed from 3b recess Segment 1 is fitted. In this way, the joining side surfaces 14 and 14 of the hexagonal segment 1 and the joining surface 3
a and 3b are brought into contact with each other, and the projections 11 and 11 of the joint surface 3a and the concave portions 12 and 12 of the joint surface 3b are fitted.

(2) In this state, the bolt insertion hole 15 is inserted from the joint side surface 14 of the fitted hexagonal segment 1.
A hexagonal bolt 16 is inserted and screwed into a female screw portion 17 provided on the joint surface 3a of the hexagonal segment 1 already assembled. By doing so, the joint surface 3a of the hexagonal segment 1 already assembled and the joint surface 3b of the fitted hexagonal segment 1 are reliably positioned and maintained in a joined state. (3) Furthermore, by tightening the connecting bolts 13, and the bonding side 14 of the hexagon segment 1 already assembled, fitted the joint side of the hexagonal segment 1 1
4 are connected. (4) By repeating the above operations (1) to (3), a plurality of hexagonal segments 1, 1,.
The cylindrical wall 2 is formed in the excavation direction (the direction of the arrow A in FIG. 1).

As described above, according to the joint structure of the hexagonal segments of the above embodiment, the plurality of hexagonal segments 1, 1
In order to assemble the cylindrical wall body 2 by ..., the joining surfaces 3a,
When 3b is joined together, each joining surface 3a, 3b
Are formed in a state where the convex portions 11 and 11 and the concave portions 12 and 12 are fitted. Thereby, even if pressure is applied to the cylindrical wall 2 from the ground, displacement of the joint surfaces 3a, 3b of the hexagonal segments 1, 1,. Therefore, the joining surfaces 3a, 3b
An extremely high-strength cylindrical wall body 2 in which the deformation of the tunnel due to the mutual displacement is prevented can be configured, and the safety of the tunnel can be improved.

When assembling the hexagonal segment 1, a bolt insertion hole 15 formed substantially parallel to the joint surface 3a is provided.
The bolt 16 from the joint side 14 of the hexagonal segment 1
And screwed into the female thread portion 17 of the joint surface 3a of the hexagonal segment 1 already assembled, thereby connecting the joint surface 3b of the hexagonal segment 1 to be assembled with the joint surface 3a of the hexagonal segment 1 already assembled. In addition to ensuring a reliable pressure contact state, it is possible to reliably apply an axial force in the circumferential direction of the already constructed tubular wall body 2 by applying the pressing force at the time of joining in the circumferential direction. Thus, an extremely favorable assembly state can be ensured. Also,
The bolt insertion hole 15 is connected to the joint side surface 1 of the hexagonal segment 1.
4 and that communicates over to the bonding surface 3b, that is, since those which opens these joining sides 14 and bonding surface 3b, and the tubular wall 2 by assembling a hexagonal segments 1,1 ... With this configuration, the opening of the bolt insertion hole 15 can be closed. Therefore, it is possible to configure the cylindrical wall body 2 whose inner surface and outer surface are extremely smooth.

The hexagonal segment 1 has a joint
The convex portion 11 and the concave portion 12 fitted to the surfaces 3a and 3b
Since it is provided, it is formed in a tenon shape on the cylindrical wall
Hexagonal segment into mounting recess of hexagonal segment 1
At the time of assembling
The protrusions 11 and the recesses 12 of 3a and 3b are already assembled.
Recesses 12 in joining surfaces 3a, 3b of hexagonal segment 1
And the projection 11 is fitted to the
Yawing, pitching or square
Even if there is a slight
Hexagonal segments 3a, 3b can be assembled accurately and reliably
With the bolt 16 and the connecting bolt 13
Fastening can be performed very well. In the above embodiment, the convex portions 11 and the concave portions 12 are formed in a truncated cone shape, but the specific shapes of the convex portions 11 and the concave portions 12 are not limited to the embodiments. Further, the assembling means of the hexagonal segment 1 is not limited to the embodiment.

[0014]

As described above, according to the joint structure of hexagonal segments of the present invention, the following effects can be obtained. Insert a bolt into the bolt insertion hole of the hexagonal segment and screw it into the female thread on the joint surface on one side of the already assembled hexagonal segment, and join the newly attached hexagonal segment to the end of the cylindrical wall By doing so, it is possible to secure a reliable press-contact state between the joining surface of the hexagonal segment to be assembled and the joining surface of the already assembled hexagonal segment, and to apply the pressing force at the time of joining in the circumferential direction. As a result, an axial force can be reliably applied in the circumferential direction of the cylindrical wall already constructed, and an extremely favorable assembly state can be secured. Further, the bolt insertion hole, that communicates over to the bonding surface of the bonding side and the other side portion of the hexagonal segment, that is, these joint side
Since the opening is formed on the surface and the joint surface, the opening of the bolt insertion hole can be closed by assembling the hexagonal segments to form the cylindrical wall. Therefore, it is possible to form a cylindrical wall whose inner surface and outer surface are extremely smooth.

[Brief description of the drawings]

FIG. 1 is a plan view of a part of a cylindrical wall for explaining a joint structure of hexagonal segments according to the present invention.

FIG. 2 is a cross-sectional side view of a part of a cylindrical wall body for explaining a hexagonal segment joining structure of the present invention.

FIG. 3 is a cross-sectional view of a hexagonal segment illustrating a shape of a joint surface formed by the hypotenuse of the hexagonal segment.

FIG. 4 is a front view of the joint surface for explaining the shape of the joint surface formed by the oblique sides of the hexagonal segments.

FIG. 5 is a side view of a cylindrical wall formed by hexagonal segments.

FIG. 6 is a partial cross-sectional view of a hexagonal segment for explaining a conventional joint structure between hexagonal segments.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Hexagonal segment 2 Cylindrical wall 3a, 3b Joint surface 14 Joint side surface 15 Bolt insertion hole 16 Bolt 17 Female screw part

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Munetaka Ozeki 2-6-21 Yaesu, Chuo-ku, Tokyo Rose Bay Yaesu Building Ishikawajima Building Materials Industrial Co., Ltd. (72) Inventor Hiroki Someya 2-chome Yaesu, Chuo-ku, Tokyo No. 6-21 Loose Bay Yaesu Building Ishikawajima Building Materials Industry Co., Ltd.

Claims (1)

(57) [Claims] 1. A joining structure of hexagonal segments forming a cylindrical wall body in the axial direction of an excavation hole by connecting a plurality of them to each other, wherein said hexagonal segment has a joining surface formed of a hypotenuse. one substantially parallel to the bonding surface of the side portion, a bolt insertion hole communicated to the bonding surface of the one side portion joining the side and the other side portion adjacent to the joint surface of formed, and the one side Female on the mating side
Flip portion is formed, when mounting the hexagonal segments already to an end of the constructed tubular wall member, said inserting the bolts into the bolt insertion hole, and the hexagonal segments that are already attached to the bolt The hexagonal segment to be attached is joined to the end of the tubular wall by screwing into the female thread of the joint surface on one side.
Junction structure of hexagonal segments, characterized in that.