JPH0618750Y2 - Bolt fastening machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a bolt fastening machine used for assembling a segment lined in a tunnel, for example.

[Prior Art] Generally, when constructing a tunnel, a shield construction method is often used. In this shield construction method, a tunnel face is excavated by a blade at the front end of the shield while holding the face. The rear thrust of the jack propels the shield, and as the shield is propelled, a segment made of reinforced concrete or the like is assembled at the rear portion of the shield to complete the lining.

FIG. 3 shows a bolt fastener for segment assembly which has been conventionally used. The bolt fastener has a recess 3 provided with flanges 2 and 2 of two segments 1 and 1 to be joined. , 3 are composed of a pair of nut support arm 4 and bolt support arm 5 which can be inserted / removed by a drive mechanism such as an actuator (not shown) and can be moved toward and away from each other with the flanges 2, 2 sandwiched therebetween. The nut support arm 4 is rotatably fitted inside a casing 6 to a pinion 8 and fixed shafts 9 and 10 which are rotationally driven by a motor 7 provided at the base end of the casing 6 via bearings 11 and 12. A gear transmission mechanism 15 composed of mounted gears 13 and 14, and a socket 18 in which a tooth groove 17 that is rotatably supported by a bearing 16 and meshes with the gear 14 of the gear transmission mechanism 15 is engraved, The socket
A nut fitting hole 20 into which the nut 19 can be fitted around the rotation axis of the socket 18 is provided on the surface facing the bolt support arm 5 of the 18
Also, a bolt insertion hole 22 for receiving the tip of the bolt 21 protruding from the nut 19 is bored, and the bolt support arm 5 is provided on the surface facing the socket 18 on the rotation axis of the socket 18. The bolt having its center on the extension
A bolt fitting hole 23 for holding the head of 21 is formed.

When assembling the segments 1 and 1, the nut support arm 4 and the bolt support arm 5 are separated from each other, the nut 19 is fitted into the nut fitting hole 20 of the socket 18, and the bolt fitting hole of the bolt supporting arm 5 is fitted. With the heads of the bolts 21 fitted in the 23, the tip ends of the nut support arm 4 and the bolt support arm 5 are respectively recessed in the segments 1 and 3.
Nut support arm 4 and bolt support arm 5
Are brought close to each other, the bolt 21 is inserted into the bolt holes 24 of the flanges 2, 2 which are overlapped, and the tip of the bolt 21 is pressed against the screw hole of the nut 19. Then, the motor 7
To rotate the pinion 8 by means of the rotation of the pinion 8 to transmit the rotation of the pinion 8 to the socket 18 via the gears 13 and 14, and to bring the nut support arm 4 and the bolt support arm 5 close to each other in synchronization with the rotation speed of the socket 18. Tighten the nut 19 to the bolt 21 by. After the fastening of the bolt 21 and the nut 19 is completed, the motor 7 is stopped, the nut support arm 4 and the bolt support arm 5 are moved away from each other, and the recess 3,
It is designed so that it can be pulled out more than 3.

[Problems to be solved by the invention] However, in recent years, it has become more common to dig a tunnel at a considerably deep position of the underground, and in such a case, the earth pressure applied to the segment becomes considerably high, and therefore the thickness becomes thick. A segment having two bolt holes each provided on the joining flange to increase the number of fastening bolts to increase the strength has come to be used. In such a bolt fastening machine, only one bolt can be tightened at a time, which has a drawback that work efficiency is very poor.

In view of the above situation, the present invention aims to provide a bolt fastening machine capable of simultaneously fastening a plurality of bolts and improving work efficiency.

[Means for Solving the Problems] The present invention supports a nut so that the flanges 2 and 2 having a plurality of bolt holes 24a and 24b can move forward and backward on both sides and can be moved toward and away from each other with the flanges 2 and 2 interposed therebetween. The arm 4 and the bolt support arm 5 are arranged, the motors 7a and 7b are arranged in parallel at the base end of the casing 6 of the nut support arm 4, and the pinions 8a and 8b rotationally driven by the motors 7a and 7b are casing. A socket 18a having a phase difference in the direction of the axis of rotation and arranged in the interior of the casing 6, and nut fitting holes 20a, 20b and bolt insertion holes 22a, 22b formed in the tip and center of the casing 6, respectively. , 18b,
The flanges 2, 2 are rotatably arranged at the same intervals as the center distances of the bolt holes 24a, 24b, and the soset 18b is provided with a tooth groove 17b that meshes with the pinion 8b and the pinion 8a. The meshing gear 13 is rotatably fitted, and the gear 14 rotatably fitted to the fixed shaft 10 provided between the sockets 18a and 18b is meshed with the gear 13 to form the socket 18a.
A tooth groove 17a that meshes with the gear 14 is engraved on the surface of the bolt support arm 5 facing the sockets 18a, 18b.
Bolt fitting holes 23a, 23b centered on the extension of the rotation axis of the sockets 18a, 18b and capable of fitting the heads of the bolts 21a, 21b.
Is provided.

[Operation] Therefore, the nut support arm 4 and the bolt support arm 5 are moved away from each other, and the nut fitting holes 20 of the sockets 18a and 18b are provided.
The nuts 19a and 19b are fitted into the bolts a and 20b, and the heads of the bolts 21a and 21b are fitted into the bolt fitting holes 23a and 23b, respectively.
While the nut support arm 4 and the bolt support arm 5 are brought close to each other in a state in which they are positioned on both sides of the flanges 2 and 2 so that the rotation axis of the flange and the centers of the bolt holes 24a and 24b of the flanges 2 and 2 coincide with each other, Drives motor 7a to drive pinion 8a and gear 1
Rotate the socket 18a via 3, 14 and also the motor 7b
When the socket 18b is rotated via the pinion 8b, the bolts 21a, 21b penetrate the bolt holes 24a, 24b and the nuts 19a, 19b are fastened to the bolts 21a, 21b at the same time.

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

FIG. 1 and FIG. 2 show an embodiment of the present invention, and the third embodiment
The same parts as those in the figure are represented by the same reference numerals.

As shown in FIGS. 1 and 2, the motors 7a and 7b are arranged in parallel at the base end of the casing 6 of the nut support arm 4, and the motors 7a and 7b are
Pinions 8a and 8b, which are rotatably driven by 7b, are arranged inside the casing 6 with a phase difference in the direction of the rotation axis, and at the tip and center of the casing 6, a nut fitting hole 20a and a bolt are respectively provided. The socket 18a having the insertion hole 22a and the nut fitting hole 20b and the socket 18b having the bolt insertion hole 22b are provided at the same distance as the center distance between the bolt holes 24a, 24b of the flanges 2,2. The bearings 16a, 16b are arranged so as to be rotatable.

The socket 18b has a tooth groove 1 that meshes with the pinion 8b.
7g is engraved and a gear 13 that meshes with the pinion 8b is rotatably fitted through a bearing 25, and the socket
A gear 14 rotatably fitted to a fixed shaft 10 provided between 18a and 18b via a bearing 12 is meshed with the gear 13, and a tooth groove 17a meshing with the gear 14 is formed in the socket 18a.

Further, on the surface of the bolt supporting arm 5 facing the sockets 18a, 18b, bolt fitting holes 23a, 23b having their centers are formed on the extension of the rotational axes of the sockets 18a, 18b.

In the figure, 19a and 19b indicate nuts and 21a and 21b indicate bolts.

Next, the operation of the above embodiment will be described.

When assembling segments 1 and 1, nut support arm 4
The bolt support arm 5 is moved away from each other, and the socket 18
The nuts 19a and 19b are fitted into the nut fitting holes 20a and 20b of the a and 18b, and the bolt fitting holes 23a and 23 of the bolt support arm 5 are fitted.
With the heads of the bolts 21a, 21b fitted in b, insert the tip ends of the nut support arm 4 and the bolt support arm 5 into the recesses 3, 3 of the segments 1, 1 respectively, and rotate the sockets 18a, 18b. The shaft centers are made to coincide with the centers of the bolt holes 24a, 24b of the flanges 2, 2 overlapped with each other, and the nut support arm 4 and the bolt support arm 5 are brought close to each other, and the bolts 21a, 21b are provided.
Is inserted into the bolt holes 24a, 24b of the flanges 2, 2 and the tips of the bolts 21a, 21b are pressed against the screw holes of the nuts 19a, 19b, respectively. Then, the pinions 8a, 8b are driven by the motors 7a, 7b.
When the pinion 8b is driven to rotate,
Meanwhile, the rotation of the pinion 8a is transmitted to the socket 18b.
A gear 13 rotatably fitted to the fixed shaft 10 via a bearing 25 and a gear rotatably fitted to the fixed shaft 10 via a bearing 12.
It is transmitted to the socket 18a via 14 and the sockets 18a and 18b rotate in the same direction, and the nut support arm 4 and the bolt support arm 5 are brought close to each other in synchronization with the rotation speed of the sockets 18a and 18b. Tightening of the nuts 19a and 19b with respect to 21a and 21b is performed simultaneously. Bolt 21a, 2
After the completion of the fastening of 1b and the nuts 19a, 19b, the motors 7a, 7b are stopped and the nut support arm 4 and the bolt support arm 5 are moved away from each other and pulled out from the recesses 3, 3.

In this way, the time required for fastening the bolts 21a, 21b and the nuts 19a, 19b is significantly shortened, the work efficiency is improved, and the socket 18b is provided with the tooth groove 17b that meshes with the pinion 8b and the pinion. Since the gear 13 that meshes with the gear 8a is rotatably fitted, the thickness and width of the nut support arm 4 can be minimized, so that the nut support arm 4 can be housed compactly and the segment 1 The recesses 3 and 3 provided with the flanges 1 and 2 of 1 and 1 can be set small, which is also useful for reducing the cost of the segments 1 and 1.

The bolt fastening machine of the present invention is not limited to the above-mentioned embodiment, and it goes without saying that various modifications can be made without departing from the scope of the present invention.

[Advantages of the Invention] As described above, according to the bolt fastening machine of the present invention, it is possible to simultaneously tighten the plurality of bolts 21a and 21b, which makes it possible to improve work efficiency and, moreover, to the socket 18b. Since the tooth groove 17b that meshes with the pinion 8b is engraved and the gear 13 that meshes with the pinion 8a is rotatably fitted, the thickness and width of the nut support arm 4 can be minimized. The nut support arm 4 can be housed compactly, and the recesses 3 and 3 in which the flanges 2 and 2 of the segments 1 and 1 are provided can be set small, which also helps to reduce the cost of the segments 1 and 1. That is, the excellent effect can be achieved.

[Brief description of drawings]

FIG. 1 is a side sectional view of an embodiment of the present invention, FIG. 2 is a sectional view taken along the line II-II of FIG. 1, and FIG. 3 is a side sectional view of a conventional example. 2 is a flange, 4 is a nut support arm, 5 is a bolt support arm, 6 casings, 7a and 7b are motors, 8a and 8b are pinions, 13 and 14 are gears, 15 is a gear transmission mechanism, 18a and 18b are sockets, 19a , 19b are nuts, 20a, 20b are nut fitting holes, 21a, 21
Reference numeral b is a bolt, 23a and 23b are bolt fitting holes, 24a and 24b are bolt holes, and 25 is a bearing.

Claims (1)

[Scope of utility model registration request] 1. A flange (2) having a plurality of bolt holes (24a), (24b), capable of advancing and retreating to both sides of the flange (2), and the flanges (2), (2).
A nut support arm (4) and a bolt support arm (5) are arranged so as to be able to approach and separate from each other with the motor (7a), the casing (6) base end portion of the nut support arm (4), (7b)
Are arranged side by side, and the pinions (8a) and (8b) rotationally driven by the motors (7a) and (7b) are arranged inside the casing (6) with a phase difference in the rotational axis direction, respectively. Sockets (18a), (18b) in which nut fitting holes (20a), (20b) and bolt insertion holes (22a), (22b) are bored at the tip and center of the casing (6), respectively, Flange (2), (2) bolt holes (24a), (24b) is the same as the center-to-center distance and is rotatably arranged, and the socket (18b)
A tooth groove (17b) that meshes with the pinion (8b) is engraved, and a gear (13) that meshes with the pinion (8a) is rotatably fitted between the sockets (18a) and (18b). Fixed shaft installed in
A gear (14) rotatably fitted in (10) is meshed with the gear (13), and a socket (18a) is provided with a tooth groove (17a) meshing with the gear (14). On the surface of the bolt supporting arm (5) facing the sockets (18a) and (18b), the sockets (18
a), (18b) is centered on the extension of the rotation axis and bolts (21
Bolt fitting holes (23a) and (23b) that allow the heads of (a) and (21b) to be inserted freely.
A bolt fastening machine characterized in that