JP3462071B2 - Hexagon segment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hexagonal segment which is installed on a ground inner surface of an excavation hole and is connected to each other to form a tubular tunnel wall body when constructing a tunnel by a shield construction method. Is.

[0002]

2. Description of the Related Art A shield method used as a method for constructing a tunnel is to excavate a ground by a shield machine, form a drill hole, and install a large number of segments on the inner surface of the drill hole at the rear of the ground hole, It is a method of connecting and constructing a tunnel. The segment used in this method is a plate-shaped body with a certain thickness that curves along the inner surface of the drill hole, and its plan view shape is generally rectangular such as rectangular, but in recent years a hexagonal shape has been adopted. Has been done. This hexagonal segment is approximately symmetrical vertically (up and down in the axial direction of the drill hole in the actual installation state) and vertically, and is installed along the inner surface of the drill hole with the left and right lines of symmetry aligned with the circumferential direction of the tunnel. It is of the type.

FIG. 7 shows the above hexagonal segment.
1 schematically shows a tunnel wall body 10 being formed in the ground by a shield construction method. This tunnel wall 10
A large number of concrete hexagonal segments are cylindrically mounted on the inner surface of the drill hole and are formed by connecting them to each other. The formation direction of this tunnel wall body 10 (excavation direction of the shield machine) is the direction of arrow Q,
In this figure, the straight line portion S and the curved portion R are being formed. The straight line portion S is composed of a plurality of one type of hexagonal segments 11 joined together, and the hexagonal segments 11 are symmetrical with respect to the left and right (the axial direction of the drill hole in the actual installation state) and vertically. It is a hexagonal shape in plan view with a slightly longer direction, and is an arcuate plate-like body that curves along the circumferential inner surface of the excavation hole, and is installed along the inner surface of the excavation hole.

Further, the curved portion R has a plurality of bent portions 9 along the circumferential direction, and the bent portions 9 are formed by bending the bent portions 9 by a predetermined angle. Therefore, this curved portion 9
In, a hexagonal segment 16 bent at the center and a hexagonal segment 17 having a joint end surface formed in a tapered shape are used.

Also, these hexagonal segments 11, 1
As shown in FIG. 8, each of the plugs 6 and 17 has a plug 32 and a socket 33, which are fitted to each other in a concave-convex manner, on a joint end surface 31 formed of an oblique side.
Thus, the joint end faces 31 are positioned and prevented from shifting. In addition, an insert nut 34 is provided on one side of a joining surface 31 formed by oblique sides that are joined to each other, and a bolt inserted into a sheath tube 35 inside from a side surface of a segment on the other side is fastened. ing. The hexagonal segments 11, 1
6 and 17, sheath tubes 36 are provided in the width direction thereof, and long bolts that connect to each other are inserted into the sheath tubes 36. By fastening these long bolts, the hexagonal segments 11, 16 , 17 are joined to each other at the joint end surfaces on the side portions.

The hexagonal segment 1 having the above-mentioned shape
As shown in FIG. 9, the molds for manufacturing 1, 16, 17 are as follows.
Bottom plate 41 and side plates 4 provided on both sides of the bottom plate 41
2 and a substantially V-shaped end plate 4 provided at both ends of the bottom plate 41
3 and the concrete is placed in the concrete placing space S surrounded by the bottom plate 41, the side plate 42, and the end plate 43, and the hexagonal segments 11, 16 and 17 are formed. There is. This mold has hexagonal segments 11, 16, 1 formed by side plates 42 and end plates 43 for demolding the hexagonal segments 11, 16, 17.
It is movable in the direction away from 7. And
A pair of end plate members 43a that form the end plate 43 of the frame are formed with a concave portion 44 for molding the plug 32 and a convex portion 45 for molding the socket 33, respectively. A mounting mechanism (not shown) is provided on the end plate member 43a on the one side portion, and the insert nut 34 is supported by this mounting mechanism.

However, the mold for moving the side plate 42 and the end plate 43 requires a moving mechanism for each, so that it becomes extremely complicated and large-scale.
For this reason, a mold having a structure in which the plug 32 provided on the joining end surface 31 formed of the hypotenuse is attached later and the end plate 43 is fixed and can be removed from the mold is used. That is, in the mold of this structure, a molding member for molding the socket 33, a molding member for molding a mounting hole to which the insert nut 34 and the retrofit plug are mounted, and a molding member for molding a positioning recess are respectively formed on the end plate 43. It is designed to be supported by an attachment mechanism, and is released from the mold when the mold is released, so that the molding member and the insert nut 34 are released from the mold together with the hexagonal segments 11, 16 and 17.

The retrofit plug will now be described.
In FIG. 10, reference numeral 41 is a retrofit plug. A fitting protrusion 42 is formed on the bottom of the post-installed plug 41. On the other hand, a holding recess 43 into which the bottom of the retrofit plug 41 is fitted and a fitting projection 4 of the retrofit plug 41 are formed on the joint end surface 31 formed by the oblique sides of the hexagonal segments 11, 16 and 17 to which the retrofit plug 41 is attached.
A fitting hole 44 into which 2 is fitted is formed. That is, the fitting protrusion 42 of the retrofit plug 41 is fitted into the fitting hole 44 of the joining end surface 31 of the hexagonal segments 11, 16 and 17.
Further, by fitting the bottom portion of the retrofit plug 41 into the holding recess 43, the retrofit plug 41 can be easily attached to the joining end surface 31 of the hexagonal segments 11, 16, 17.

[0009]

By the way, after the hexagonal segments 11, 16 and 17 are joined together, the socket 3
Since a large force is applied to the plug 41 fitted to the connector 3, the fixing structure that can further firmly fix the retrofit plug 41 to the joint end surface 31 of the hexagonal segments 11, 16 and 17 without impairing workability is desired. It was rare.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a hexagonal segment capable of easily attaching a post-installed plug to the joining end surface of the hexagonal segment with high strength. There is.

[0011]

In order to achieve the above object, the hexagonal segment according to claim 1 is formed in a hexagonal shape in plan view, and is joined to each other in a drill hole to form a tubular tunnel wall body. Which is a concrete hexagonal segment forming a joint end surface to be joined to each other, a plug and a socket that are fitted into each other in a concavo-convex manner are provided, and the plug has a plug body that fits into the socket, A fitting protrusion that fits into a fitting hole formed in the joint end surface to attach the plug body to the joint end surface, and the fitting protrusion is formed on the outer peripheral surface thereof in the circumferential direction. It is characterized in that a plurality of ridges are formed in the axial direction. As a result, after the fitting protrusion of the plug is fitted into the fitting hole of the joint end surface, each ridge is pressed against and engages with the inner peripheral surface of the fitting hole to firmly secure the plug to the joint end surface. The fitting state is maintained.

A hexagonal segment according to a second aspect of the present invention is the hexagonal segment according to the first aspect, wherein the protrusion is formed by a saw tooth inclined rearward in a direction in which the fitting protrusion is fitted into the fitting hole. It is characterized by becoming. As a result, when the fitting protrusion of the plug is fitted into the fitting hole of the joint end face, the fitting is smoothly performed, and after fitting the fitting protrusion into the fitting hole, The saw teeth of the protrusions are surely engaged with the inner peripheral surfaces of the fitting holes, so that a strong fitting state is maintained.

The hexagonal segment according to claim 3 is the hexagonal segment according to claim 1 or 2.
A slit is formed along the axis of the fitting protrusion. That is, at the time of fitting the joint end face into the fitting hole, the fitting protrusion elastically deforms in the direction of narrowing the slit, that is, inward, so that the fitting can be easily fitted. After fitting in the dowel,
Since the elastically deformed fitting protrusion is restored outward, the restoring force pushes the protrusion more securely against the inner peripheral surface of the fitting hole, so that stronger mounting strength can be obtained.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the hexagonal segment of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 51 is a retrofit plug attached to the joint end surface 31 formed by the hypotenuse of the hexagonal segments 11, 16 and 17, and is molded from a resin such as ABS. The post-installed plug 51 has a plug main body 52 and a fitting protrusion 53 provided on the bottom of the plug main body 52, and the fitting protrusion 53 forms the hexagonal segments 11, 1.
It is fitted and attached to a fitting hole 44 formed in the joint end face 31 of Nos. 6 and 17. In addition, on the joint end face 31,
As described above, the holding concave portion 43 is formed, and the bottom portion of the post-installed plug 51 is fitted into the holding concave portion 43 to be positioned and held.

The fitting projection 53 of the retrofit plug 51 is shown in FIG.
As also shown, the outer circumference is formed in an uneven shape. Specifically, the saw tooth 54 that is inclined rearward in the fitting direction of the fitting projection 53 into the fitting hole 44 of the joining end surface 31 and is formed over the circumferential direction of the fitting projection 53 is the fitting projection 53.
Are provided in the axial direction.

When the above-mentioned retrofit plug 51 is attached to the joint end surface 31 of the hexagonal segments 11, 16, 17, the fitting projection 5 of the retrofit plug 51 is inserted into the fitting hole 44.
3 is fitted, and the bottom portion of the retrofit plug 51 is fitted into the holding recess 43. In this way, in the post-installed plug 51, the fitting projection 53 of the plug 51 bites into the fitting hole 44 of the joining end surface 31 and the bottom has the holding recess 43 of the joining end surface 31.
It is attached in a state where it is positioned and held. In addition, between the post-installed plug 51 and the joint end surface 31,
An adhesive is applied in advance, and the post-installed plug 51 and the joint end surface 31 are fixed by adhesion.

Here, as described above, the fitting projection 53 of the post-installed plug 51 is formed so as to incline rearward in the fitting direction into the fitting hole 44 and extend in the circumferential direction of the fitting projection 53. Since the plurality of saw teeth 54 are provided in the axial direction of the fitting protrusion 53, the fitting protrusion 53 can be smoothly fitted into the fitting hole 44. After the fitting, the saw teeth 54 of the fitting projection 53 engage with the inner peripheral surface of the fitting hole 44, respectively, so that a strong fitting state is maintained. Therefore, this retrofit plug 5
According to 1, the mounting firmness of the hexagonal segments 11, 16, 17 to the joint end surface 31 is significantly enhanced without impairing the mounting workability.
It is possible to have a structure that can sufficiently withstand the force applied after the joining end faces 31 of Nos. 6 and 17 are joined.

FIGS. 3 and 4 show a post-installed plug 51 in which a plurality of slits 55 are formed in a cross shape in the axial direction on a fitting protrusion 53 having the saw teeth 54 formed thereon. According to the retrofit plug 51 having the fitting protrusion 53, the fitting protrusion 53 is elastically deformed in the direction of narrowing the slit 55, that is, inward when the fitting plug 53 is fitted into the fitting hole 44, so that the fitting plug 53 is easily fitted. After the fitting projection 53 is fitted into the fitting hole 44, the elastically deformed fitting projection 53 is restored to the outside, and the restoring force of the saw tooth 54 causes the saw tooth 54 to fit. Can be more reliably engaged with the inner peripheral surface of the, and a stronger mounting strength can be obtained.

In FIG. 5, in place of the saw teeth 54, a plurality of mountain-shaped protrusions 56 formed in the outer periphery of the fitting protrusion 53 in the circumferential direction thereof are provided in the axial direction of the fitting protrusion 53. According to the retrofit plug 51 having the fitting protrusions 53, the protrusions 56 are pressed against the inner peripheral surface of the fitting holes 44 after the fitting protrusions 53 are fitted into the fitting holes 44. By being engaged and engaged, a strong fitted state is maintained. Further, as shown in FIG. 6, a plurality of slits 55 are formed in a cross shape in the axial direction on the fitting protrusion 53 having the protrusion 56, and as described above, the fitting hole 53 is fitted into the fitting hole 44. At the time of fitting, the fitting protrusion 53 is elastically deformed inward to facilitate the fitting, and after fitting into the fitting hole 44, the elastically deformed fitting protrusion 53 is restored to the outside. The ridge 56 is pressed against the inner peripheral surface of the fitting hole 44 by the restoring force,
A stronger mounting strength can be obtained.

Of course, the fitting protrusion 53 which constitutes the above-mentioned retrofit plug 51 may be integrated with the plug body 52 or may be a separate body.

[0021]

As described above, according to the hexagonal segment of the present invention, the following effects can be obtained.
According to the hexagonal segment of claim 1, a plurality of protrusions formed in the circumferential direction of the fitting protrusion of the plug attached to the joint end face are provided in the axial direction of the fitting protrusion. , After fitting the fitting protrusion into the fitting hole,
By pressing and engaging the respective protrusions with the inner peripheral surface of the fitting hole, it is possible to maintain a strong fitting state of the plug with the joint end surface. In other words, according to this plug, the mounting firmness of the hexagonal segment to the joint end face is significantly enhanced without impairing the mounting workability, and the joint end face of the hexagonal segment is joined to the socket so as to be recessed and fitted. It is possible to have a structure that can sufficiently withstand the force applied after being applied.

According to the hexagonal segment of the second aspect, since the protrusion formed on the outer periphery of the fitting protrusion is a saw tooth inclined rearward in the fitting direction into the fitting hole, the fitting protrusion is formed. When mating with the mating hole, the mating can be done smoothly, and after fitting the mating protrusion into the mating hole, the saw teeth of the mating protrusion are By firmly engaging with the inner peripheral surface, a firm fitting state can be maintained.

According to the hexagonal segment of the third aspect, at the time of fitting into the fitting hole, the fitting projection is elastically deformed in the direction of narrowing the slit, that is, inward, so that the fitting can be easily fitted. After the fitting projection is fitted into the fitting hole, the elastically deformed fitting projection is restored to the outside, so that the restoring force of the projection makes it possible to more reliably secure the protrusion to the inner peripheral surface of the fitting hole. Since it is pressed against, stronger mounting strength can be obtained.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a joint end surface of a hexagonal segment for explaining a hexagonal segment according to an embodiment of the present invention.

FIG. 2 is a side view of the retrofit plug for explaining the shape of the retrofit plug provided in the hexagonal segment according to the embodiment of the present invention.

FIG. 3 is a side view of the post-installed plug for explaining the shape of another post-installed plug provided in the hexagonal segment according to the embodiment of the present invention.

FIG. 4 is a front view of the post-installed plug for explaining the shape of another post-installed plug provided in the hexagonal segment according to the embodiment of the present invention.

FIG. 5 is a side view of the post-installed plug for explaining the shape of another post-installed plug provided in the hexagonal segment according to the embodiment of the present invention.

FIG. 6 is a side view of the post-installed plug for explaining the shape of another post-installed plug provided in the hexagonal segment according to the embodiment of the present invention.

FIG. 7 is a perspective view of a tunnel wall showing a tunnel wall constructed using hexagonal segments.

FIG. 8 is a plan view of a hexagonal segment for explaining a shape and a joining structure of the hexagonal segment constituting the tunnel wall body.

FIG. 9 is a plan view of a mold for explaining the configuration and structure of the mold for producing a hexagonal segment.

FIG. 10 is a cross-sectional view of a joining end surface of a conventional hexagonal segment to which a retrofit plug is attached.

[Explanation of symbols]

11, 16, 17 Hexagonal segment 31 joining end face 33 socket 44 Mating hole 51 Retrofit plug (plug) 52 Plug body 53 Fitting protrusion 54 Sawtooth 55 slits 56 ridges

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroki Someya 1-12-1 Yurakucho, Chiyoda-ku, Tokyo Within Ishikawajima Kenzai Kogyo Co., Ltd. (72) Inventor Shuichi Nishimura 1-12-1 Yurakucho, Chiyoda-ku, Tokyo Ishikawajima Building Material Industry Co., Ltd. (72) Inventor Akio Hashiguchi 1-12-1, Yurakucho, Chiyoda-ku, Tokyo Ishikawajima Construction Material Co., Ltd. (56) Reference JP-A-7-62989 (JP, A) JP-A-9- 32489 (JP, A) JP-A-2-217598 (JP, A) Actual development Sho-49-118237 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) E21D 11/04 E21D 11 / 08

Claims (3)

(57) [Claims] 1. A concrete hexagonal segment that is formed in a hexagonal shape in plan view and forms a tubular tunnel wall body by being joined to each other in an excavation hole. A plug and a socket that are fitted to each other in a concavo-convex manner are provided;
A fitting protrusion that is fitted into a fitting hole formed in the joint end surface to attach the plug body to the joint end surface, and the fitting protrusion is formed on the outer peripheral surface thereof in the circumferential direction. A hexagonal segment characterized in that a plurality of ridges are formed in the axial direction. 2. The hexagonal segment according to claim 1, wherein the protrusion is a saw tooth inclined rearward in the fitting direction of the fitting protrusion into the fitting hole. 3. The hexagonal segment according to claim 1, wherein the fitting protrusion has a slit formed along an axis.