JP3474339B2 - 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 joint structure of segments that form a cylindrical wall body in the axial direction of a drill hole by connecting a plurality of them to each other.

[0002]

2. Description of the Related Art As a method for constructing a tunnel, a so-called shield construction method is generally used in which segments (mainly made of concrete or steel) are assembled on the inner surface side of an excavation hole to construct a tubular wall body. As the segments used in this shield construction method, those having a rectangular shape in a plan view and an arc plate shape are mainly used, and these segments are joined together by bolts. As a structure for joining the segments with each other with this bolt, a joint having holes communicating with each other when the joint surfaces of the segments are brought into contact with each other is embedded in the vicinity of the joint surfaces of the segments. A structure is generally used in which a bolt is inserted into a hole portion and a nut is fastened to the bolt in a state where the joint surfaces of the segments are in contact with each other so that the portions communicate with each other. Further, there is also a structure in which insert metal fittings, which are nut members, are embedded in mutual segments, and bolts penetrating adjacent segments are fastened to join them.

[0003]

However, in the above structure, the bolt is inserted into the hole formed in the joint surface of the joint at the construction site, and the nut is fastened to the bolt or embedded in the mutual segments. Since the extremely complicated work of fastening the bolt to the insert metal fitting is required, there is a limit in shortening the assembly time, and it is difficult to adapt to automatic assembly by a robot. Moreover,
Even if the secondary lining is omitted, the bolt box formed in the segment must be closed in order to install the bolts and nuts, and a new joint structure can be used to speed up construction and save labor. The current situation is that development is an urgent task.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a joining structure of segments that can be joined to each other extremely easily and reliably.

[0005]

In order to achieve the above object, the segment joining structure according to claim 1 is joined in a state where the joining surfaces of the segments are aligned with each other to form a tunnel wall body. In the joining structure, the joining surfaces to be joined to each other in the circumferential direction are inclined with respect to the axial direction of the excavation hole, and these joining surfaces have a male joint fitting having rod-shaped portions arranged in the axial direction. And a female joint fitting having a fitting portion into which the rod-shaped portion of the male fitting fitting is fitted,
The rod-shaped portion is formed at its outer periphery with a longitudinal portion along the longitudinal direction, and the fitting portion is provided at its inner periphery with a dovetail groove portion with which the lateral portion of the rod-shaped portion is engaged in the longitudinal direction. And the rod-shaped portion of the male joint fitting is fitted to the fitting portion of the female joint fitting while engaging the groove portion with the dovetail groove portion. It is characterized in that it is joined in the circumferential direction by the engaging force between the portion and the dovetail groove portion of the fitting portion.

According to a second aspect of the present invention, there is provided a joining structure for segments.
The segment joining structure according to claim 1, wherein the segments are joined together in a state where their joining surfaces are aligned with each other to form a tunnel wall, and the joining surfaces joined in the circumferential direction are: It is inclined with respect to the axial direction of the drill hole, and one of these joint surfaces is provided with a male joint fitting having a rod-shaped portion arranged in the axial direction, and the other of the joint surfaces is provided with the male die. A female joint fitting having a fitting portion into which the rod-shaped portion of the fitting is fitted is provided, and the rod-shaped portion is provided at its outer periphery with a hollow portion along the longitudinal direction,
In the fitting portion, an dovetail groove portion with which the hollow portion of the rod-shaped portion is engaged is formed on the inner periphery thereof along the longitudinal direction,
By fitting the rod-shaped portion of the male joint fitting to the fitting portion of the female fitting while engaging the dowel portion with the dovetail groove portion, the dowel portion of the rod-shaped portion and the dovetail portion of the fitting portion are engaged. It is characterized in that it is joined in the circumferential direction by the engagement force with the groove. The joint structure of the segment according to claim 3,
In the segment joining structure according to claim 1 or 2, the rod-shaped portion and the fitting portion are each formed in a tapered shape that is gradually narrowed toward the tip end direction. The segment joint structure according to claim 4 is the segment joint structure according to any one of claims 1 to 3, wherein each of the joint faces in the circumferential direction has a trapezoidal plan view inclined in directions opposite to each other. It is characterized by being formed.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION A segment joining structure according to an embodiment of the present invention will be described with reference to FIGS. In the figure, reference numeral 1 is a segment. This segment
It is a segment made of concrete formed in a trapezoidal shape in a plan view, and the joint surface 1a in the circumferential direction is an arc plate inclined with respect to the axial direction of the drill hole, and each is joined in the circumferential direction. Thus, the ring that constitutes the tubular wall body is constructed.

Joining surface 1 of these segments 1 in the circumferential direction
In a, the male joint fitting 2 is provided on the short side and the female joint fitting 3 is provided on the long side. The male fitting 2 is
It is roughly configured by a metal fitting body 5 having a plurality of anchors 4 embedded in the segment 1 and a rod-shaped portion 7 formed in the metal fitting body 5 and having a semi-cylindrical cross section. The rod-shaped portion 7 of the male joint fitting 2 is provided with a mortar portion 9 on the outer periphery thereof, the width dimension of which is widened at intervals along the longitudinal direction toward the outer periphery. Further, the rod-shaped portion 7 of the male joint fitting 2 is formed in a tapered shape that is gradually narrowed toward the short side of the segment 1.

The female joint fitting 3 is roughly composed of a fitting main body 11 having a plurality of anchors 4 embedded in the segment 1 and a fitting portion 12 provided in the fitting main body 8. The fitting portion 12 of the female joint fitting 3 is formed in a semicircular cross-section into which the rod-shaped portion 7 can be fitted, and the inner circumference thereof is spaced at intervals along the longitudinal direction and toward the outer circumference. A dovetail groove portion 13 whose width dimension is widened toward the side is formed. The fitting portion 12 of the female joint fitting 3 is also formed in a tapered shape that is gradually narrowed toward the short side direction side of the segment 1.

In addition, on the joint surface 1a of the segment 1, between the male joint fitting 2 and the female joint fitting 3, a convex portion 14 continuous with the rod portion 7 of the male joint fitting 2 and a female joint fitting. A recess 15 continuous with the fitting portion 12 of No. 3 is formed. When the segment 1 having the above structure is to be joined in the circumferential direction, the rod portion 7 of the male joint fitting 2 provided on the joining surface 1a is fitted to the fitting portion 12 of the female joint fitting 3. While
By sliding each segment 1 in the axial direction, the groove portion 9 formed on the rod portion 7 of the male joint fitting 2 is engaged with the dovetail groove portion 13 formed on the fitting portion 12 of the female joint fitting 3. And the convex portion 14 formed on the joint surface 1a.
And the concave portion 15 are fitted to each other, and the segments 1 are joined to each other with the joining surfaces 1a abutting each other.

That is, according to the segment 1 having the above structure,
By simply fitting the rod-shaped portion 7 of the male joint fitting 2 of the segment 1 into the fitting portion 12 of the female joint fitting 3,
The dovetail portion 9 of the rod portion 7 and the dovetail groove portion 13 of the fitting portion 12 are engaged with each other, and the engaging force of each engages the respective segments 1
Rings can be constructed by joining together in the circumferential direction. As a result, compared to the conventional fastening structure using bolts and nuts or the fastening structure that fastens bolts to the insert fitting, the labor required for joining the segments 1 to each other can be significantly reduced. Since there is no bolt box, the work of closing the bolt box can be omitted.

Further, since the rod-shaped portion 7 of the male joint fitting 2 and the fitting portion 12 of the female joint fitting 3 are shaped so as to be gradually narrowed in the fitting direction, the rod-shaped portion 7 is By fitting into the fitting portion 12, a wedge effect is obtained by the rod-shaped portion 7 and the fitting portion 12, mutual joining surfaces 1a are attracted and accurately positioned, and reliable joining of the segments 1 is achieved. The state can be secured. Further, according to the above-mentioned segment 1, since the male joint fitting 2 and the female joint fitting 3 are respectively provided on the joint surfaces 1a on both sides in the same direction, the directionality of each segment 1 can be eliminated. Therefore, the segment 1 can be shared.

When a ring constituting a tubular wall body is constructed by using the trapezoidal segments 1, if the number of divisions in the circumferential direction is an even number, the trapezoidal segments 1 in plan view are alternately arranged. However, when the number of divisions in the circumferential direction is odd, parallelogram segments may be used for joining. In the above example, the male joint fitting 2 and the female joint fitting 3 are provided on each joint surface 1a.
As shown in FIG. 7, a male segment 1 having a male joint fitting 2 on each joint surface 1a and a female segment 1 having a female joint fitting 3 on each joint surface 1a are used. Male joint fitting 2 provided on the joint surface 1a of the mold segment 1
And the female joint fitting 3 provided on the joint surface 1a of the female segment 1 may be joined.

[0014]

As described above, according to the segment joining structure of the present invention, the following effects can be obtained. According to the segment joint structure of claim 1, the rod-shaped portion of the male joint fitting provided on the joint surface of the segment is fitted into the fitting portion of the female joint fitting, and the hollow portion of the rod-like portion is fitted. By engaging with the dovetail groove portion of the joining portion, the segments can be extremely easily joined to each other by the engaging force between the groove portion and the dovetail groove portion. That is, compared with the conventional fastening structure using bolts and nuts or the fastening structure that fastens bolts to the insert fitting, the labor required for the joining work can be significantly reduced and the automatic assembly by the robot can be facilitated. Further, since there is no bolt box or the like, the work of closing the bolt box can be omitted.

According to the segment joint structure of the second aspect, the male joint fitting provided on one joint surface of the segment has a rod portion on the other joint surface of the adjacent segment. By fitting the rod-shaped portion of the dovetail portion to the dovetail groove portion of the mating portion, it is possible to join the segments very easily by the engaging force of the dowel portion and the dovetail groove portion. it can. That is, compared with the conventional fastening structure using bolts and nuts or the fastening structure that fastens bolts to the insert fitting, the labor required for the joining work can be significantly reduced and the automatic assembly by the robot can be facilitated. Further, since there is no bolt box or the like, the work of closing the bolt box can be omitted.

According to the segment joint structure of the third aspect, since the rod-shaped portion and the fitting portion are each formed in a tapered shape that is narrowed toward the front end direction, the rod-shaped portion is fitted into the fitting portion. By combining them, a wedge effect is obtained by the rod-shaped portion and the fitting portion, the joint surfaces of the segments are attracted and accurately positioned, and a reliable joint state can be secured. According to the segment joint structure of the fourth aspect, since the joint surfaces are formed in a trapezoidal shape in a plan view inclined in directions opposite to each other, it is possible to eliminate the directionality of the segments. Can be realized.

[Brief description of drawings]

FIG. 1 is a plan view of a segment illustrating a joining structure of segments according to an embodiment of the present invention.

FIG. 2 is a perspective view of a segment for explaining the joining structure of the segments according to the embodiment of the present invention.

FIG. 3 is a side view of the segment for explaining the joining structure of the segments according to the embodiment of the present invention.

FIG. 4 is a plan view in which a part of a joint portion of the segment is viewed in section for explaining the joint structure of the segment according to the embodiment of the present invention.

FIG. 5 is a cross-sectional view of a segment joining part for explaining the segment joining structure according to the embodiment of the present invention.

FIG. 6 is a side sectional view of a joint portion of the segment for explaining the joint structure of the segment according to the embodiment of the present invention.

FIG. 7 is a plan view of a segment for explaining another segment joining structure according to the embodiment of the present invention.

[Explanation of symbols]

1 segment 1a Bonding surface 2 Male fittings 3 female fittings 7 Bar 9 Hoso Division 12 Fitting part 13 Ant groove

─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Kenta Matsubara 2-3 Chome, Kandajimachi, Chiyoda-ku, Tokyo Obayashi Corporation Tokyo Head Office (72) Inventor Atsushi Takeda 2-3-3, Kandajimachi, Chiyoda-ku, Tokyo Stocks Company Obayashi Tokyo Head Office (56) Reference JP-A-7-238790 (JP, A) JP-A-3-224991 (JP, A) JP-A-4-131499 (JP, A) JP-A-6-280488 ( JP, A) JP-A-9-60488 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) E21D 11/04 E21D 11/08

Claims (4)

(57) [Claims] 1. A joining structure of segments which are joined together in a state where their joining surfaces are aligned with each other to form a tunnel wall, wherein the joining surfaces joined in the circumferential direction are in the axial direction of the excavation hole. The male joint fittings, which are inclined with respect to each other, have a rod-shaped portion arranged in the axial direction on these joint surfaces, and a female joint having a fitting portion into which the rod-shaped portion of the male joint fitting is fitted. A metal fitting is provided, the rod-shaped portion is formed with a hollow portion along the longitudinal direction on the outer periphery thereof, and the fitting portion is engaged with the rod-shaped portion of the rod-shaped portion on the inner periphery thereof. The dovetail groove is formed along the longitudinal direction, and by fitting the rod-shaped portion of the male joint fitting to the fitting portion of the female joint fitting while engaging the dowel portion with the dovetail groove, , The circumferential contact is made by the engaging force between the bar-shaped groove and the dovetail groove of the fitting part. Joint structure of segments characterized by being combined. 2. A joining structure of segments which are joined together in a state where their joining surfaces are aligned to each other and constitute a tunnel wall, wherein the joining surfaces joined in the circumferential direction are in the axial direction of the drill hole. The male joint fitting having a rod-shaped portion arranged in the axial direction is provided on one of these joining surfaces, and the rod-shaped portion of the male joint fitting is provided on the other of the joining surfaces. A female joint fitting having a fitting portion to be fitted is provided, the rod-shaped portion has an outer periphery formed with a groove portion along the longitudinal direction, and the fitting portion has an inner periphery thereof, A dovetail groove portion with which the groove portion of the rod-shaped portion is engaged is formed along the longitudinal direction. The rod-shaped portion of this male joint fitting is engaged with the dowel portion to the dovetail groove portion while the female-type joint is being engaged. By fitting it to the fitting part of the metal fitting, A segment joining structure, which is joined in the circumferential direction by an engaging force with a dovetail groove. 3. The segment joining according to claim 1, wherein the rod-shaped portion and the fitting portion are each formed in a tapered shape that is gradually narrowed toward a tip end direction. Construction. 4. The joining of segments according to claim 1, wherein each joining surface in the circumferential direction is formed in a trapezoidal shape in plan view inclined in directions opposite to each other. Construction.