JP2569823Y2 - Ring joint fitting for steel segment - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inter-ring joint fitting for fastening the rings of a steel segment which is a lining material of a shield tunnel.

[0002]

2. Description of the Related Art Conventionally, bolts and nuts have been used as joints between rings of steel segments, and bolt holes of the steel segments between rings have been aligned. It is common to fasten with.

[0003]

In the conventional bolt-nut type joint, when steel segments are automatically assembled by an automatic assembling machine, it is not easy to position bolt holes between rings, and moreover, it is difficult to position bolt holes between rings. Supply bolts and nuts,
A series of automatic operation mechanisms for tightening the nut after the bolt is inserted into the bolt hole is extremely complicated, and there is a problem that it becomes expensive as an automatic assembly machine.

[0004]

According to the present invention, a plurality of metal caulking pieces 3 formed in a U-shape are formed around a front end of a fixing portion 2 made of a metal tube with a required gap 4 in the circumferential direction. The present invention proposes a steel segment ring-to-ring joint fitting which is integrally formed so as to protrude and is formed in a spindle shape as a whole.

[0005]

As shown in FIG. 2, a new steel segment 5 to be newly assembled is erected in front of an existing steel segment 5 previously assembled in a ring shape, and fittings for the new steel segment 5 are assembled. 1 and the insertion hole 6 of the existing steel segment 5 are made substantially coincident with each other, and as shown in FIG.

At this time, since the conical tapered portion 3b on the tip end side of the crimping piece group 3 has a sharp tapered surface, even if the tip end position is slightly eccentric with respect to the insertion hole 6, it is inserted. Insertion into the insertion hole 6 is ensured, and the positions of the front and rear segments 5, 5 are automatically adjusted as they are inserted.

Further, since the caulking piece group 3 has a gap 4 between each piece, even if the middle large-diameter portion 3a has a slightly larger outer diameter than the inner diameter of the insertion hole 6, the insertion hole 6 After the large-diameter portion 3a passes through the insertion hole 6, it is restored by elasticity and the diameter is expanded after the large-diameter portion 3a passes through the insertion hole 6 in the vicinity of the expanded large-diameter portion 3a. By locking the periphery of the insertion hole 6, the joining surfaces 5a and 5b of the segments 5 and 5 are temporarily fixed to each other as shown in FIG.

In this state, as shown in FIG. 5, a conical caulking metal fitting 7 is pushed into the tip of the group of caulking pieces 3, and each caulking piece 3 is pushed open and bent to join the segments 5 in the direction between the rings. 5 are caulked and fastened.

Further, when a tensile force is required such as when a tensile force acts to separate the segments 5 and 5 from each other in the direction between the rings, a bolt 8 is inserted through the fixing portion 2 as shown in FIG. By using the taper nut 9 to make a strong connection.

[0010]

FIG. 1 shows a joint fitting 1 of the present invention. A metal caulking piece 3 formed in a bent shape around a distal end of a fixing portion 2 made of a metal tube has a concave inner surface. A plurality of spindles which are integrally provided projecting inward with a required gap 4 in the circumferential direction and which have conical tapered portions 3b and 3c before and after a large diameter portion 3a located at an axially intermediate portion as a whole of the caulking pieces 3 group. It is formed in a mold.

As shown in FIG. 2, the fitting 1 is attached to one of the joint surfaces 5a, 5b of the front and back of the steel segment 5 by a fixing means such as screwing or welding. A group of three pieces is projected forward, and a corresponding insertion hole 6 is provided in the other joint surface 5b.

The insertion hole 6 is formed slightly larger than the outer diameter of the fixing portion 2 and slightly smaller than the outer diameter of the large-diameter portion 3a of the caulking piece 3 group.

In the above configuration, the steel segments 5, 5
When joining the steel segments 5 in the direction between the rings, a new steel segment 5 to be newly assembled is erected in front of the existing steel segment 5 previously assembled in a ring shape. The fitting 1 and the insertion hole 6 of the existing steel segment 5 are made substantially coincident with each other, and as shown in FIG.

At this time, since the conical tapered portion 3b on the tip end side of the swaging piece 3 group has a sharp tapered surface, even if the tip end position is slightly eccentric with respect to the insertion hole 6, it is inserted. Insertion into the insertion hole 6 is ensured, and the positions of the front and rear segments 5, 5 are automatically adjusted as they are inserted.

Further, since the caulking piece group 3 has a gap 4 between each piece, even if the middle large diameter portion 3a has a slightly larger outer diameter than the inner diameter of the insertion hole 6, the insertion hole 6 After the large-diameter portion 3a passes through the insertion hole 6, it is restored by elasticity and the diameter is expanded after the large-diameter portion 3a passes through the insertion hole 6 in the vicinity of the expanded large-diameter portion 3a. By locking the periphery of the insertion hole 6, the joining surfaces 5a and 5b of the segments 5 and 5 are temporarily fixed to each other as shown in FIG.

In this state, as shown in FIG. 5, a conical caulking metal fitting 7 is pushed into the tip of the group of caulking pieces 3 and each caulking piece 3 is pushed open and bent to join the segments 5 in the direction between the rings. 5 are caulked and fastened.

Further, when a tensile force is required, for example, when a tensile force is applied to separate the segments 5 and 5 from each other in the direction between the rings, a bolt 8 is inserted through the fixing portion 2 as shown in FIG. By using the taper nut 9 to make a strong connection.

[0018]

[Effects of the Invention] As described above, according to the present invention, it is possible to join even if the fitting fitting protruding from the segment to be joined and the insertion hole are eccentric, so that the segment positioning and the fastening work are easy, and the direction between the rings is easy. Can be easily and at low cost.

Since the segments can be temporarily fixed only by inserting the fittings into the insertion holes, it is possible to secure the segments after the shield machine is excavated and then tighten the segments by caulking or bolting.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a joint fitting of the present invention.

FIG. 2 is a longitudinal sectional view showing a state in which the joint fitting of the present invention is fixed to a segment.

FIG. 3 is a longitudinal sectional view showing a state where the joint fitting of the present invention is inserted into an insertion hole.

FIG. 4 is a longitudinal sectional view showing a state in which segments are temporarily fixed by the joint fitting of the present invention.

FIG. 5 is a longitudinal sectional view showing a state in which the joint fitting of the present invention is swaged.

FIG. 6 is a longitudinal sectional view showing a state in which the joint fitting of the present invention is fastened with bolts and nuts.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Joint fitting 2 Fixing part 3 Caulking piece 3a Large diameter part 3b Conical taper part 3c Conical taper part 4 Gap 5 Steel segment 5a Joining surface 5b Joint surface 6 Insertion hole 7 Caulking metal fitting 8 Bolt 9 Taper nut

Claims (1)

(57) [Scope of request for utility model registration] A plurality of metal caulking pieces bent in a U-shape around a fixed end made of a metal tube and projecting integrally with a required gap in the circumferential direction to form a spindle type as a whole. A ring-to-ring joint fitting for a steel segment, characterized by being formed as follows.