JP2625980B2 - Segment bolting machine - Google Patents

Description

The present invention relates to a bolt fastening machine for a segment of a tunnel in a shield excavation method.

[Conventional technology] A shield excavation method is generally used for constructing a tunnel. In this method, a tunnel face is excavated at a tuyere at a front end of the shield, and a shield is applied by a rear jack thrust while holding the face. The lining is completed by assembling the reinforced concrete segments by bolting at the rear portion inside the shield with the propulsion of the shield.

The segments commonly used in the past are the fifth,
As shown in FIG. 6, a concave bolt for fastening between an adjacent segment and a circumferential end and an axial end of a segment 1 having an arc plate shape so as to form a part of a tunnel. The steel connection piece 3 forming the box hole 2 was embedded.

However, the segment 1 provided with the connecting piece 3 is
Since a large number of connection pieces 3 are expensive, the connection pieces 3 increase the price of the segment 1 and cause an increase in tunnel construction work cost.

For this reason, in recent years, as shown in FIG. 7, a bolt box hole 2 is simply formed in a concrete part at a position inside the connecting surface 4 of the connecting segments 1 and 1 by a required distance 1 without providing a connecting piece. A long bolt 6 is inserted into a bolt hole 5 having the bolt box hole 2 opened between the connection surface 4 and the bolt end, and both ends are fastened with nuts 7,7, thereby forming the concrete end face thick portion at the interval l. 8, the strength of the segment 1 is maintained, thereby reducing the price of the segment 1.

In this case, since the bolt 6 for connection becomes long,
The long bolt 6 cannot be inserted after the segments 1 and 1 are arranged. This is related to the fact that the bolt box hole 2 cannot be made too large (because the segment strength is reduced). For this reason, as shown in the figure, a bolt housing hole 9 is formed on the opposite side of the bolt hole 5 of the bolt box hole 2 so that the long bolt 6 can be housed in the bolt housing hole 9 in advance.

[Problem to be Solved by the Invention] However, a new problem has arisen in the segment shown in FIG. That is, as shown in FIGS. 5 and 6, when the bolt box hole 2 is located at the end face of the segment, connection with a short bolt is possible. Penetrate into the bolt box hole,
An automatic fastening device for automatically fastening bolts between segments by rotating a bolt and a nut close to each other has been implemented, but a long bolt 6 as shown in FIG. In such a method, the long bolt 6 cannot be pulled out from the bolt housing hole 9 and thus cannot be automated.

For this reason, conventionally, after positioning the segments 1 and 1 with each other using a machine called an erector, as shown in FIG. 8, a worker inserts the long bolt 6 housed in the bolt storage hole 9 into the bolt hole 5. After being pulled out by hand to position both ends of the long bolt 6 so as to protrude into the corresponding bolt box holes 2 of the adjacent segments, as shown in FIG. 7 is screwed on, and then tightened by hand using a spanner 10 as shown in FIG.

However, in the above-mentioned conventional method, since the fastening operation is performed manually, this operation is performed in a very poor place in a circular ring device for moving and positioning the rear segment in the excavator to a predetermined position. And had many problems in safety, work efficiency, management of tightening torque, and the like. In recent years, a segment having a large thickness and strength has been considered in accordance with a demand for a tunnel having a large depth or a large diameter.
There is a demand for bolt fastening of the steps, and in this case, there is a problem that the fastening takes more time and the working efficiency is reduced.

The present invention focuses on the above conventional problems,
It is an object of the present invention to provide a segment bolt fastening machine that can perform a fastening operation safely and efficiently by automation even when fastening segments using long bolts.

[Means for Solving the Problems] The present invention relates to a bolt fastening machine main frame supported on a segment side with respect to a segment assembling apparatus so as to be able to approach and separate from the segment side, and a bolt box hole of each of adjacently arranged segments. Confronting and approaching each other, a nut runner and a nut holder supported by the bolt fastening machine main frame so that they can be separated from each other, and one of the nut runner and the nut holder is close to the segment side and supported so that it can be separated. And a pinch roll device having a pinch roll having a pinch roll rotated by a feed motor while clamping a long bolt housed in a bolt housing hole of one of the bolt box holes of the segment, It is related to.

[Operation] A long bolt housed in a bolt box hole is clamped by a pinch roll of a pinch roll device, and then the pinch roll is rotated by a feed motor to pull out the long bolt from the bolt housing hole, and a bolt box of an adjacent segment is used. Position each of the holes such that both ends of the long bolt protrude.

Next, the nut accommodated in the nut runner and the nut holder is inserted into both ends of the long bolt by inserting the nut runner and the nut holder into the respective bolt box holes and moving the nut runner closer to each other while driving the nut runner. Screwed and tightened.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 4 shows an example of segments 1, 1 'used for fastening by the bolt fastening machine of the present invention.
Bolt holes 5,5 'formed in 1,1' bolt box holes 2,2 '
A guide pipe 12, which has flared portions 11, 11 'flared so that the diameter gradually increases at the end of the connecting surface 4 side,
At the end of the guide pipes 12, 12 'on the side of the bolt box holes 2, 2', the long bolts 6 accommodated in the bolt accommodation holes 9, 9 'move by gravity and fall off. There are provided retaining rings 13 and 13 'for giving a required restraining force so as not to have any. Bolt receiving holes 9, 9 'formed in bolt box holes 2, 2'
Are provided with inner diameter securing tubes 14, 14 'for holding the accommodated long bolts 6 in an easily movable state.

FIG. 1 shows an example of a bolt fastening machine of the present invention.
A main frame 17 of a bolt fastening machine which can move in a direction (arrows A, A ') approaching and separating from the segments 1, 1' via a guide rod 16 with respect to a segment assembling device (erector) 15.
Are provided on the main frame 17 along a guide rod 18 provided in a direction parallel to the inner surfaces of the segments 1 and 1 ′,
A nut runner 19 and a nut holder 20 are provided, which can be moved in the separating directions (arrows B and B ').

The nut runner 19 has a rotary socket 21 that accommodates one nut 7 corresponding to the long bolt 6 by attracting it with a magnet or the like, and the rotary socket 21 is connected to a fastening motor 22 via a built-in gear (not shown). To be driven to rotate.

Further, the nut holder 20 has a fixed socket 23 for accommodating the other nut 7 with a magnet or the like.

On the nut runner 19 side of the nut holder 20, a direction in which the moving drive device 24 such as a cylinder approaches or separates from the segments 1 and 1 'via the guide rod 25 (arrows C and C').
, A movable pinch roll device 26 is provided.

As shown in FIGS. 2 and 3, the pinch roll device 26 simultaneously rotates around shafts 28 and 29 via bearings 30 by meshing with each other and rotating one of them by a clamp driving device 27 such as a cylinder. Gears 31, 32, each of which has a gear 31,
32 is provided with eccentric shafts 33 and 34 eccentric to the shafts 28 and 29, and the long bolt 6 is clamped to the lower end (segment side) of each eccentric shaft 33 and 34. Pinch rolls 35 and 36 are provided.

The one pinch roll 36 has a bearing with respect to the eccentric shaft 34.
37, and the other pinch roll 35
Is fixed to an eccentric shaft 33, and the eccentric shaft 33 to which the pinch roll 35 is fixed is driven to rotate by a feed motor 38.

 The operation will be described below.

As shown in FIG. 4, the segment 1 in which the long bolt 6 is accommodated in the bolt accommodation hole 9 of one of the bolt box holes 2, 2 '.
When the nut holder 20 and the pinch roll device 26 are positioned so as to correspond to the bolt box holes 2 in which the long bolts 6 are accommodated in a state where 1 'is positioned adjacent to the position, the moving drive device 24 is operated. Then, the pinch roll device 26 is inserted into the bolt box hole 2. At this time, the clamp driving device 27 in FIG. 2 is reduced, whereby the pinch rolls 35 and 36 are separated as shown by the arrow D in FIG. You.

Subsequently, when the clamp driving device 27 is extended to rotate the gears 31 and 32 in the direction of the arrow in FIG. 2, the eccentricity of the eccentric shafts 28 and 29 is reduced.
As a result, the pinch rolls 35 and 36 approach in the direction of arrow D ',
The long bolt 6 is pinched and grasped.

Next, by driving the pinch roll 35 by the feed motor 38, the long bolt 6 is pulled out from the bolt receiving hole 9 and inserted into the bolt hole 5 'side of the other segment 1'. The operation of the feed motor 38 is stopped assuming that the protrusions are approximately the same in the holes 2, 2 '.

Subsequently, while the long bolt 6 is clamped by the pinch rolls 35 and 36, the movement driving device 24 is released,
By moving the main frame 17 in the direction of arrow A, the nut runner 19 and the nut holder 20 are moved to the bolt box holes 2,
The sockets 21 and 23 are inserted into the sockets 2 ′ so as to face the long bolts 6. At this time, nut runner 19 and nut holder
Reference numeral 20 denotes a position separated from each other so as not to collide with the long bolt 6 (a position far from the connecting surface 4 in the bolt box hole).

Next, after the clamping of the long bolt 6 by the pinch rolls 35 and 36 is released by the reverse operation, the movement driving device 24 is released.
To return the pinch roll device 26 to the main frame 17 side (C 'direction).

Subsequently, while rotating the rotary socket 21 of the nut runner 19 by the fastening motor 22, the nut runner 19 and the nut holder 20 are brought close to each other at a pitch speed at which the long bolt 6 and the nut 7 are screwed together. Tighten up to.

Thereafter, the driving force of the fastening motor 22 is released, the nut runner 19 and the nut holder 20 are separated from each other as indicated by an arrow B ', and then the main frame 17 is moved as indicated by an arrow A' to thereby rotate the nut runner 19 and the nut holder 20. Is pulled out from the bolt box holes 2, 2 'to complete the fastening operation.

In the segment 1, a retaining ring is provided in the bolt hole 5.
Since the bolt 13 is provided, it is possible to prevent the long bolt 6 from dropping out of the bolt receiving hole 9 even during transportation or the like before assembling the segments.

The pinch rolls 35 and 36 in the above embodiment are supported by a spring or the like, or are made of an elastic material such as rubber so that the clamping force has a required elasticity to absorb dimensional errors and the like so that the fixed clamping force is maintained. Can be held. This is effective when a plurality of long bolts are arranged and fastened in the thickness direction of the segment.

The present invention is not limited only to the above embodiment, and the movement of the main frame, the nut holder, etc. is performed by a cylinder,
Various methods such as screws, rack and pinion type can be adopted, the pinch roll device may be provided on the nut runner side, and the bolt accommodation hole is only in the bolt box hole of the segment that accommodates the long bolt. What you may have,
Needless to say, the present invention can be carried out even when a plurality of long bolts are fastened in the thickness direction of the segment, and various changes can be made without departing from the gist of the present invention.

[Effects of the Invention] As described above, according to the segment bolt fastening machine of the present invention, it is possible to automate the fastening of segments by long bolts, and therefore, it is possible to use inexpensive segments to safely and securely perform segment fastening work. It is possible to carry out the method efficiently, and it is possible to achieve an excellent effect that a great reduction in construction cost and a shortening of the construction period can be achieved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention, and FIG.
FIG. 3 is an enlarged plan view of the pinch roll device shown in FIG.
FIG. 4 is a sectional view showing an example of a segment to be fastened by the device of the present invention, FIG. 5 is a front view showing an example of a conventional general segment, and FIG. In the figure
VI-VI arrow view, FIG. 7 is a sectional view of a segment using a long bolt conventionally considered, FIGS. 8, 9 and 10 are diagrams showing a fastening procedure of the segment of FIG. is there. 1, 1 'is a segment, 2, 2' is a bolt box hole, 5, 5 'is a bolt hole, 6 is a long bolt, 7 is a nut, 9, 9' is a bolt receiving hole, 13, 13 'is a retaining ring, 15 is a segment assembly device, 1
7 is the main frame of the bolt fastening machine, 19 is the nut runner, 20
Is a nut holder, 21 is a rotating socket, 22 is a fastening motor, 23 is a fixed socket, 24 is a moving drive device, 26 is a pinch roll device, 27 is a clamp drive device, 31 and 32 are gears, 33,
34 denotes an eccentric shaft, 35 and 36 denote pinch rolls, and 38 denotes a feed motor.

Claims (1)

(57) [Claims] 1. A main body of a bolt fastening machine which is supported on a segment side with respect to a segment assembling apparatus so as to be releasable, and faces respective bolt box holes of adjacent segments and is close to each other. A nut runner and a nut holder releasably supported by the main frame of the bolt fastening machine; a nut box of one of the segments that is supported on the segment side with respect to one of the nut runner and the nut holder and releasably; A pinch roll device having a pinch roll rotated by a feed motor by clamping a long bolt received in a bolt receiving hole of the hole.