JP3311253B2 - Segment fastening device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for fastening a segment which is assembled at the rear of a shield machine and wraps a tunnel in a shield method.

[0002]

2. Description of the Related Art Generally, a tunnel lining segment is composed of a plurality of segments obtained by dividing a cylindrical body divided in an axial direction into a plurality of segments at a predetermined angle. , There is an inter-ring fastening portion connecting the segments in the axial direction.

In these fastening parts, a conventional example using bolts and nuts is generally used. That is, in the fastening portions of the segments, a fastening recess is formed via the connecting wall, and a bolt hole that can communicate with each other is formed in the connecting wall. Then, these segments are moved to the assembling position and positioned by the elector device, and both bolt holes of the fastening portion are communicated. Further, the bolt is held by the bolt chucker of the bolt / nut fastening device, carried in from the connection recess, and fitted into the bolt hole, and the nut is held by the nut runner, carried into the fastening recess, and fitted into the bolt. The nuts are rotationally driven and tightened to assemble the segments.

[0004]

However, in recent years, bolts
Along with the automation of the nut fastening device, the fastening work has been shortened.If conventional bolts and nuts are to be loaded and fastened, steps such as supply, gripping, loading, and positioning of bolts and nuts are required. Therefore, there is a problem that it is extremely difficult to shorten the fastening work.

[0005] As another conventional example, there is a structure in which an insert metal member having a female screw hole is embedded in a fastening portion of one adjacent segment so as to save the trouble of loading and mounting a nut.

However, in this case, if the bolt and the female screw hole are screwed in while being displaced from each other, the screw thread may be damaged and fastening may not be performed. In that case, it is extremely difficult to replace the insert hardware, so the entire segment must be replaced, and there is a problem in that the loss is large both in terms of time and economy.

The invention according to claim 1 of the present invention solves the above-mentioned problems and provides a fastening device for a segment which can perform fastening work of bolts and nuts quickly and can be easily replaced even if a screw thread is broken. The purpose is to do.

[0008]

According to the first aspect of the present invention, there is provided a method for connecting tunnel lining segments excavated by a shield method to each other via bolts and nuts. A segment fastening device, wherein a bolt insertion recess is formed on an inner surface side of a connecting wall formed in a fastening portion of an adjacent segment, and a nut is formed on an inner surface side of a connecting wall formed in a fastening portion of the other segment. A nut for forming an insertion concave portion, forming a bolt hole communicating with each other in the both connecting walls, and a nut for restricting rotation of the nut in the concave portion for nut insertion so that the nut faces the bolt hole before the assembly of the segment and rotates in the fastening direction. A holding tool is provided, and the nut is detachable by attaching / detaching means provided on the nut holding tool.

According to the above construction, the fastening operation can be performed quickly by previously mounting the nut in the nut insertion recess with the holder facing the bolt hole before assembling the segment. If the screw thread is damaged due to poor meshing, the holder can be removed and the nut can be easily replaced.

According to a second aspect of the present invention, the nut holder has the fitting cylindrical portion formed around the bolt hole on the inner surface of the connecting wall, and the restricting wall sandwiching the plurality of outer surface portions of the nut. A holding cylinder detachably fitted to the fitting cylinder portion, wherein the attaching / detaching means projects a locking projection on one of the fitting cylinder portion and the holding cylinder and the locking projection on the other. An engaging portion that fits and stops the holder body from rotating is formed.

[0011] According to the above construction, the fixed cylindrical member with the nut mounted thereon is fitted into the fitting cylindrical portion and is prevented from rotating by the locking projection and the locking portion, so that the nut is reliably prevented from rotating and held. It can be attached and detached easily.

According to a third aspect of the present invention, in the nut holding member having the above-mentioned configuration, a gate-shaped member having an opposing wall for sandwiching opposing outer surface portions of the nut, and the gate-shaped member is detachably mounted in the nut insertion recess. And fixing bolts for fixing the fixing bolts.

According to the above-described structure, the nut can be held by using the portal member having a simple structure and the inexpensive fixing bolt, so that the cost can be reduced. Still further, according to a fourth aspect of the present invention, in each of the above-described structures, a bolt holding means capable of holding the bolt in advance before assembly is provided in the bolt hole of the bolt insertion recess.

According to the above construction, the nut and the bolt can be mounted in the insertion recess in advance before assembling the segment, so that the bolt and the nut can be supplied and transported.
The positioning step can be omitted, and the fastening operation can be performed quickly.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Here, an embodiment of a segment fastening device according to the present invention will be described with reference to FIGS.

As shown in FIG. 7, the arc-shaped segment 11 is provided with a plurality of inter-segment fastening portions 12 connecting the segments 11 and 11 in the circumferential direction on both sides along the axial direction. Segments 1 on both sides along the circumferential direction
An inter-ring fastening portion 14 for connecting the first and the first in the axial direction;
An alignment pin 15a and an alignment hole 15b are provided. Inter-segment fastening section 12 and inter-ring fastening section 14
The bolt insertion recess 2 is provided on one side of the connection wall 21 on the inner surface side.
2 are formed, and a bolt hole 23 is formed in the connection wall 21. In the other inter-segment fastening portion 12 and inter-ring fastening portion 14, a nut insertion recess 32 is formed on the inner surface side of the connection wall 31, and a bolt hole 23 is formed in the connection wall 31.
Is formed with a bolt hole 33 communicating with the bolt hole 33.

The bolt insertion recess 22 is provided with bolt holding means 24 capable of holding the bolt B in the bolt hole 23 before assembly. This bolt holding means 24
As shown in FIG. 5A, a female screw portion 24a in which a male screw portion Ba of a bolt B formed in a bolt hole 23 can be fitted.
The bolt B can be reliably held at the axial center position of the bolt hole 23 by the female screw portion 24a.

The bolt holding means 24 is provided as shown in FIG.
As shown in (b), an O-ring 24b may be interposed between the bolt hole 23 and the male screw portion of the bolt B,
Further, as shown in FIG. 5C, a spacer ring 24c made of synthetic rubber or synthetic resin interposed at the entrance of the bolt hole 23 may be used. In the case of the O-ring 24b or the spacer ring 24c, the bolt B can be easily mounted on the bolt hole 23.

As shown in FIGS. 1 to 5, the nut insertion recess 32 is provided with a nut holder 34 for positioning the nut N in advance so as to face the entrance of the bolt hole 33 and for restricting rotation in the fastening direction. It is provided detachably by attaching / detaching means 35.

For example, the nut holder 34 is provided with a fitting tube 36 formed on the inner surface of the connecting wall 31 so as to protrude around the entrance of the bolt hole 33, and the nut N is detachably mounted on the fitting tube 36 to attach the nut N thereto. And a holding cylinder 37 capable of holding. The holding cylinder 37 has a front wall 37c formed with a pair of regulating walls 37a that sandwich the opposing outer surface of the nut N on the inner surface, and a hole 37b that abuts on the outer end surface of the nut N and allows the tip of the bolt B to protrude. Are formed. The attachment / detachment means 35 for attaching and detaching the fitting cylinder 36 and the holding cylinder 37 has a pair of locking projections 38 projecting from the outer peripheral surface of the holding cylinder 37, while the inner surface of the fitting cylinder 36 has an axial center of the bolt hole 33. The engagement groove 39a formed in the engagement groove 39 and fitted with the engagement protrusion 39, and the engagement groove 3 formed in the circumferential direction from the deep portion of the engagement groove 39a to prevent the holding cylinder 37 from rotating.
9b.

Therefore, the holding cylinder 3 with the nut N mounted thereon
7 is fitted to the fitting cylinder 36, and the locking projection 39 is fitted to the fitting groove 3.
9a, the locking projection 39 is inserted into the locking groove 3 at the back.
By rotating the nut N along 9b, the nut N can be held in advance in the nut insertion recess 32 at the axial center position of the bolt hole 33.

In the above configuration, as shown in FIG. 6, before assembly, the female screw portion 24a (or O-ring 24) serving as a bolt holding means is provided in the bolt insertion concave portion 22 of the segment 11.
b or the spacer ring 24c) at the axial center of the bolt hole 23. The holding cylinder 37 of the nut holder 34 is mounted in the nut insertion recess 32 in advance while holding the nut N.

Then, the bolt hole 23 of the bolt insertion recess 22 and the bolt hole 33 of the nut insertion recess 32 are centered by the assembling device. Then, the drive socket 42 of the fastening arm 41 arranged in the elector device is inserted into the bolt insertion recess 22, the drive socket 42 is fitted to the head Bb of the bolt B, rotated, and the nut insertion recess 32 side It is urged to. Thereby, the male screw portion Ba of the bolt B is screwed into the female screw portion Na of the nut N, and the nut N is
Are firmly fastened because they are prevented from rotating by the locking grooves 39b.

At this time, even if the threads of the bolt B and the nut N are crushed due to misalignment or the like, the damaged nut N can be easily removed by reversing the holding cylinder 37, and a new one can be quickly obtained. The nut N can be replaced, and the bolt B can be easily replaced. Further, the bolt N can be replaced by reversing it.

According to the above embodiment, before assembly, the bolt B is held in the bolt insertion recess 22 of the segment 11 at the axial center position of the bolt hole 23 by the bolt holding means, and the nut is inserted by the nut holder 34. Since the nut N is previously mounted in the recess 32, the supply and reception, transfer, insertion and positioning of the bolt B and the nut N are not required, and the fastening can be performed quickly. Of course, the fastening device of the elector device can also be simplified.
Further, even if the screw thread is deformed due to the misalignment of the bolt holes 23 and 33, the nut N (also the bolt B) can be easily and quickly replaced unlike the conventional embedded insert hardware.

Next, another embodiment of the nut holder will be described with reference to FIGS. The same members as those in the above embodiment are denoted by the same reference numerals, and description thereof will be omitted. The nut holder 51 includes a portal member 52 fitted to the nut N.
And a mounting bolt 53 which is a mounting member for detachably fixing the gate member 52 in the nut insertion recess 32. The portal member 52 has opposing side walls 52b for holding the nut N in the holding space 52a and holding the nut N therebetween by sandwiching the left and right outer surfaces, and a hole 52 for allowing the tip of the bolt B to protrude.
c, an intermediate holding wall 52d for holding the nut N from the front side, a front wall 52e, and a top wall 52g having a bolt hole 52f formed therein.
The front half of the nut N can be held in the holding space 52a and held in advance in the axial center position of the bolt hole 33 by mounting and tightening the mounting female screw hole 54 at the bottom of the insertion recess 32 from 2f. .

According to the above configuration, the same effects as those of the above embodiment can be obtained. Nut insertion recess 3
Since the rear part of the nut N can be seen from the outside of 2, the meshing state can be confirmed.

[0028]

As described above, according to the first aspect of the present invention, the fastening operation is performed by mounting the nut in the nut insertion recess with the holder facing the bolt hole before assembly of the segment. Can be done quickly. If the screw thread is damaged due to poor meshing, the holder can be removed and the nut can be easily replaced.

According to the second aspect of the present invention, the holding cylinder having the nut mounted thereon is fitted into the fitting cylindrical portion and is prevented from rotating by the locking projection and the locking portion, so that the nut is securely rotated. It can be stopped and held, and can be easily attached and detached.

Further, according to the third aspect of the present invention, the nut can be held by using a portal member having a simple structure and an inexpensive fixing bolt, so that it can be implemented at low cost. Furthermore, according to the invention of claim 4, the bolt together with the nut can be mounted in the insertion concave portion before the assembly of the segment, so that the step of supplying and transporting the bolt and the nut and the step of positioning are omitted. The fastening operation can be performed quickly.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing an embodiment of a segment fastening device according to the present invention and showing a nut holder.

FIG. 2 is a side sectional view showing a nut holder of the fastening device for the segment.

FIG. 3 is a sectional view taken along the line II shown in FIG. 2;

FIG. 4 is a sectional view taken along the line II-II shown in FIG.

FIGS. 5A and 5B are side sectional views showing bolt holding means of the fastening device for the segments, and FIGS. 5A, 5B and 5C show different bolt holding means.

FIG. 6 is a side sectional view showing a use state of the fastening device of the segment.

FIG. 7 is an overall perspective view showing a segment provided with a fastening device for the segment.

FIG. 8 is an exploded perspective view showing another embodiment of the segment fastening device according to the present invention and showing a nut holder.

FIG. 9 is a side sectional view showing the nut holder.

FIG. 10 is a sectional view taken along the line III-III shown in FIG. 9;

[Explanation of symbols]

 B Bolt N Nut 11 Segment 12 Inter-segment fastening portion 14 Inter-ring fastening portion 21 Connecting wall 22 Bolt insertion recess 23 Bolt hole 24 Bolt holding means 24a Female thread portion 24b O-ring 24c Spacer ring 31 Connection wall 32 Nut insertion recess 33 Bolt Hole 34 Nut holder 35 Attaching / detaching means 36 Fitting cylinder part 37 Holding cylinder 38 Locking projection 39 Locking part 39a Locking groove 41 Fastening arm 42 Drive socket 51 Nut holder 52 Portal member 53 Mounting bolt 52f Bolt hole

Continuation of the front page (56) References JP-A-4-11200 (JP, A) JP-A-7-80819 (JP, A) JP-A-63-170611 (JP, U) (58) Fields investigated (Int .Cl. ⁷ , DB name) E21D 11/04 E21D 11/08

Claims (4)

(57) [Claims] 1. A segment fastening device for joining tunnel lining segments excavated by a shield method to each other via bolts and nuts, comprising a joining wall formed at a fastening portion of one adjacent segment. A bolt insertion concave portion is formed on the inner surface side, a nut insertion concave portion is formed on the inner surface side of the connection wall formed in the fastening portion of the other segment, and a bolt hole communicating with each other is formed on both the connection walls. In the nut insertion recess, a nut retainer for positioning the nut in advance in the bolt hole and restricting rotation in the fastening direction is provided before the segment is assembled, and the nut can be detached by attaching / detaching means provided on the nut retainer. A segment fastening device, comprising: 2. The nut holder has a fitting cylinder formed around the bolt hole on the inner surface of the connecting wall and a regulating wall for sandwiching a plurality of outer surfaces of the nut. The attaching / detaching means is provided with a locking projection protruding on one of the fitting cylinder portion and the holding cylinder, and the locking projection is fitted on the other to prevent the holder body from rotating. The segment fastening device according to claim 1, wherein a locking portion is formed. 3. The nut holder comprises a gate member having an opposing wall for sandwiching opposing outer surfaces of the nut, and a mounting member for removably fixing the gate member in the nut insertion recess. The segment fastening device according to claim 1, wherein: 4. The segment fastening device according to claim 1, wherein a bolt holding means capable of holding the bolt before assembly is provided in the bolt hole of the bolt insertion concave portion.