JPH08158799A - Temporary bolt holding device of shield segment and bolt clamping device - Google Patents

Abstract

PURPOSE: To make it possible to supply automatically a clamping bolt to a bolt clamping device through simple construction by providing a specific shaped recessed section to the wall surface of a bolt box, and temporaily holding the head of the clamping bolt to the inside of the recessed section through an elastic body ring. CONSTITUTION: A bolt temporary holding device 6 sticks an elastic body ring on the inside of a cylindrical recessed section haivng a size larger than the head of a clamping bolt 4, and the elastic body ring is compressed by pushing the head of the clamping bolt 4 in the recessed section in advance. Frictional force occurs between the clamping bolt 4 and elastic body ring, and slippage and dropping of the clampling bolt 4 is prevented. The clamping bolt 4 held in the bolt temporary holding device 6 is only moved in the direction of the axis of a clamping bolt hole 5 and can be inserted in the clamping bolt hole 5 by providing the bolt temporary holding device 6 to the wall surface of a bolt box 1a opposed to the clamping bolt hole 5 coaxially therewith, and a supply mechanism thereof can be constituted of a simple construction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a temporary holding tool for a shield segment and a temporary holding tool for a shield segment for temporarily holding fastening bolts used for assembling shield segments in the shield construction method and supplying the fastening bolts to a bolt fastening device. The present invention relates to a bolt fastening device that fastens adjacent shield segments using held fastening bolts.

[0002]

2. Description of the Related Art The shield construction method is a method of constructing a tunnel by assembling shield segments while propelling a shield having a diameter slightly larger than the inner diameter of the tunnel into the ground. In this shield construction method, a plurality of bolts and nuts are used to fasten the existing shield segment and the newly installed shield segment held by the erector device.

Conventionally, bolts and nuts have been manually mounted, but in recent years, bolt fastening devices have been developed to automate the fastening work of these bolts and nuts. Here, the supply of the fastening bolts and nuts to the bolt fastening hands and the nut fastening hands of the bolt fastening device has been performed by providing a dedicated device for holding and feeding the bolts and nuts for each bolt fastening device. However, if a dedicated device for holding and supplying the bolts and nuts is provided for each bolt fastening device, interference may occur due to problems in the arrangement of various devices, or the mechanism for delivering and receiving the fastening bolts may be complicated, and the entire device may become complicated. There was a problem such as an increase in cost.

In order to solve such a problem, an actual exploitation 62
No. -50299 gazette for temporarily supporting segment fastening bolts, or the segment fastening bolt holder in the shield construction method disclosed in Japanese Utility Model Laid-Open No. 63-170611 has a ring seat formed of an elastic body. Alternatively, the fastening bolt is preliminarily mounted in the fastening bolt hole of the shield segment by the holder, and the fastening bolt is supplied to the bolt fastening device. The bolt fastening device grips a fastening bolt previously mounted in the fastening bolt hole with a bolt fastening hand, fits the nut grasped with the nut fastening hand from the opposite side of the fastening bolt hole, and then rotates to fasten the shield segment. .

[0005]

However, in the method of using an exclusive holder such as a ring seat for temporarily supporting the segment fastening bolt or a segment fastening bolt holder,
Since the temporary support ring seat or the bolt holder for segment fastening is inserted into the fastening bolt hole of the shield segment, the fastening bolt hole must be made larger than the fastening bolt diameter, and the strength of the fastened portion of the shield segment becomes weak. .

Further, at the time of fastening, the temporary support ring seat protruding toward the bolt box side is crushed by the fastening bolts.
For example, an elastic body such as rubber is incompressible, so if it is compressed in a state close to a closed state, excessive internal pressure will be generated, and a force that separates the nut side shield segment from the connecting bolt insertion side shield segment will act, resulting in joint strength. descend.

Further, since a large frictional force is generated between the fastening bolt and the temporary support ring seat or the like, the torque required for fastening is increased, the capacity of the rotary drive motor is increased, and the strength of the drive transmission system is increased. It is necessary, the machine has to be upsized, the equipment cost increases, and interference with the bolt box occurs.

Further, since a large frictional force is generated between the fastening bolt and the temporary support ring seat, an appropriate fastening torque cannot be predicted, and the fastening torque may be excessive or deficient and the joint rigidity may be low. There is.

In addition, when the head of the fastening bolt is gripped by the bolt fastening hand of the bolt fastening device, the fastening bolt is fixed to the fastening bolt hole of the shield segment by the temporary support ring seat or the like, so that a small misalignment occurs. If there is, it may not be possible to grip.

The present invention has been made in order to solve the above disadvantages, and a temporary bolt retainer of a shield segment capable of automatically supplying a fastening bolt with a simple structure, and a fastening bolt held by the temporary bolt retainer. The purpose of the present invention is to obtain a bolt fastening device for fastening adjacent shield segments by using.

[0011]

A temporary bolt retainer for a shield segment according to the present invention comprises a recessed portion which is slightly larger than the head portion of the fastening bolt provided on the wall surface of the bolt box facing the fastening bolt hole of the shield segment. , An elastic body ring fixed to the inside of the concave portion and holding the fastening bolt head.

Further, the bolt fastening device of the shield segment includes an auxiliary hand and an auxiliary hand elevating / lowering mechanism part, and the auxiliary hand is formed with a groove holding a pair of arms that open and close to each other and face each other and are fitted with a bolt. Has a section,
A bolt that has an arm opening / closing mechanism that opens and closes the arm at the rear end, is installed in the fastening device body on the side close to the bolt fastening hand between the bolt fastening hand and the nut fastening hand, and faces the fastening bolt hole of the shield segment. Pull out the fastening bolt held by a temporary bolt retainer that has a concave portion slightly larger than the head of the fastening bolt provided on the wall surface of the box and an elastic ring fixed inside the concave portion and holding the fastening bolt head. After being transferred to the fastening bolt hole, the auxiliary hand lifting mechanism is installed in the fastening device body on the side close to the bolt fastening hand between the bolt fastening hand and the nut fastening hand, and raises and lowers the auxiliary hand.

[0013]

In the temporary bolt retainer for the shield segment according to the present invention, the concave portion which is slightly larger than the head portion of the fastening bolt is provided on the wall surface of the bolt box facing the fastening bolt hole of the shield segment, and the elastic body is provided inside the concave portion. A ring is provided, and the head portion of the fastening bolt is temporarily held in advance by the concave portion, and the fastening bolt is supplied to the bolt fastening device.

Further, in the bolt fastening device of the shield segment, the auxiliary hand lifting mechanism lowers the auxiliary hand to the concave bolt temporary holder provided on the wall surface of the bolt box, and the pair of arms of the auxiliary hand are moved by the arm opening / closing mechanism. Open and close and grip the fastening bolt held in the concave part of the wall surface of the bolt box with the bolt gripping part at the tip, the auxiliary hand moves together with the bolt fastening hand toward the fastening bolt hole,
The fastening bolt is transferred from the concave portion to the fastening bolt hole, the bolt fastening hand pushes the head of the fastening bolt transferred by the auxiliary hand toward the fastening bolt hole, and inserts the fastening bolt into the fastening bolt hole.

[0015]

1 is a side view showing an embodiment of the present invention. The shield segment 1 is, for example, transferred and positioned by a segment assembling apparatus in the shield construction method, and then fastened and fixed to the existing shield segment 2 with fastening bolts 4 and nuts. Shield segment 1
Is a fastening bolt hole 5 in the bolt box 1a which is a fastening portion.
On the wall surface of the bolt box 1a facing the fastening bolt hole 5, a temporary bolt retainer 6 provided coaxially with the fastening bolt hole 5 is provided. As shown in the sectional view of FIG. 2, the temporary bolt retainer 6 has a cylindrical concave portion 6a which is slightly larger than the head of the fastening bolt 4 and an elastic ring 6b such as a rubber ring on the inner surface of the concave portion 6a. Equipped with. Elastic ring 6
b is attached to the inner surface of the concave portion 6a by, for example, an adhesive or the like. In this way, the head of the fastening bolt 4 is previously pushed into the concave portion 6a having the elastic body ring 6b attached to the inner surface.
The elastic body ring 6b is compressed by pushing the head of the fastening bolt 4 and a frictional force is generated between the fastening bolt 4 and the elastic body ring 6b. The frictional force prevents the fastening bolt 4 from slipping out or dropping. Further, since the temporary bolt holder 6 is provided coaxially with the fastening bolt hole 5 on the wall surface of the bolt box 1a facing the fastening bolt hole 5, the fastening bolt 4 held by the temporary bolt holder 6 is attached to the shaft of the fastening bolt hole 5. The fastening bolt 4 can be inserted into the fastening bolt hole 5 simply by transferring the fastening bolt 4 in the direction. There is no need to prepare a space for storing the fastening bolt 4 again, and
Fastening bolt 4 to fastening bolt hole 5 of shield segment 1
Can be easily transferred, and the supply mechanism of the fastening bolt 4 can be simplified.

The bolt fastening device 3 is a shield segment 1.
Is provided at the tip of the erector device 7 for positioning, and is vertically moved by the overall lifting cylinder 8, and independently in the axial direction of the fastening bolt hole 5 of the shield segment 1 by the bolt hand moving cylinder 9 and the nut hand moving cylinder 10. The bolt fastening hand 11 and the nut fastening hand 12 moving in
The auxiliary hand 13 for pulling out the fastening bolt 4 from the temporary bolt retainer 6, transferring it to the fastening bolt hole 5, and inserting it is provided with the auxiliary hand lifting mechanism section 14.

The auxiliary hand 13 is installed on the side of the nut fastening hand 12 of the bolt fastening hand 11 and moves together with the bolt fastening hand 11 in the axial direction and the vertical direction of the bolt fastening hole 5 or independently in the vertical direction. Then, the fastening bolt 4 is pulled out from the temporary bolt retainer 6, transferred to the fastening bolt hole 5 and inserted, and the fastening bolt 4 is clamped from both sides in the circumferential direction of the fastening bolt 4 as shown in the side view of FIG. For holding the bolts 16a and 17a at the tips of the pair of arms 16 and 17 to be opened and closed, and an arm opening / closing mechanism 18 at the rear ends of the arms 16 and 17,
7 has a spring 19 in the middle thereof, and is installed in the fastening device main body on the side close to the bolt fastening hand 11 between the bolt fastening hand 11 and the nut fastening hand 12. The bolt gripping portions 16a and 17a are grooves made of, for example, a plate-shaped resin such as plastic and face each other and are fitted with the fastening bolts 4. As shown in the cross-sectional view of FIG. 4, the grooves of the bolt grips 16a and 17a have a plurality of fine grooves provided in the vertical direction at intervals that match the screw pitch of the fastening bolt 4. Here, when the bolt gripping portions 16a and 17a clamp the fastening bolt 4, the thread of the fastening bolt 4 enters the fine groove of the bolt gripping portions 16a and 17a, so that the rattling or inclination of the fastening bolt 4 is caused. Can be prevented. The arm opening / closing mechanism section 18 opens the arms 16 and 17. The spring 19 closes the arms 16 and 17.

The auxiliary hand raising / lowering mechanism section 14 is used for the auxiliary hand 1.
3 is moved up and down independently of the bolt fastening hand 11 and is installed in the fastening device body on the side close to the bolt fastening hand 11 between the bolt fastening hand 11 and the nut fastening hand 12, and the fastening bolt 4 is fastened to the fastening bolt hole. 5, the bolt grips 16a, 17a are advanced to the holding position of the fastening bolt 4, the fastening bolt 4 is inserted into the fastening bolt hole 5, and then the bolt grips 16a, 17a are retracted.

Next, the shield segment 1 having the above construction
And the shield segment 2 to the bolt fastening device 3 having the above configuration
The operation in the case of tightening with will be described with reference to the operation process diagrams of FIGS. 5 and 6.

When the shield segment 1 having the fastening bolts 4 mounted on the temporary bolt holders 6 is moved to a predetermined fastening position by the erector device, the bolt fastening device 3 is positioned in the bolt box 1a of the shield segment 1.
In the bolt fastening device 3, as shown in FIG. 5A, the auxiliary hand elevating mechanism portion 14 is used to attach the bolt gripping portion 16 of the auxiliary hand 10.
a and 17a are lowered to the position of the fastening bolt 4. When the bolt grips 16a and 17a of the auxiliary hand 10 are lowered to the position of the fastening bolt 4, the arm opening / closing mechanism 18 at the rear end of the arms 16 and 17 opens and closes the tips of the arms 16 and 17, and the bolt grips 16a and 16a. The fastening bolt 4 is gripped by 17a. Here, when the bolt gripping portions 16a and 17a sandwich the fastening bolt 4, the screws of the fastening bolt 4 enter the fine grooves of the bolt gripping portions 16a and 17a, so that the fastening bolt 4 has the plate shape of the bolt gripping portions 16a and 17a. The movement is restricted by the groove made of resin, and it does not become oblique with respect to the bolt gripping portions 16a, 17a. Therefore, it is possible to reduce the error in the positions of the fastening bolt holes 5 of the shield segment 1 and the tips of the fastening bolts 4.

When the auxiliary hand 10 clamps the fastening bolt 4, the bolt hand moving cylinder 9 causes the bolt fastening hand 8, the auxiliary hand 13, and the auxiliary hand elevating mechanism portion 14 to move into the bolt fastening hole 5 as shown in FIG. 5B. And moves in the direction of the nut fastening hand 12. Thereby, the auxiliary hand 13 can pull out the fastening bolt 4 from the temporary bolt holder 6 of the shield segment 1.

The auxiliary hand 10 pulls the fastening bolt 4 out of the temporary bolt holder 6, and a sufficient gap is provided between the head of the fastening bolt 4 and the wall surface of the shield segment 1 for the bolt fastening hand 11 to enter. Then, the whole lifting cylinder 8 lowers the bolt fastening hand 11 having the square hole 15 in the shape of the head of the fastening bolt 4 to the rear of the head of the fastening bolt 4 as shown in FIG. 5C. At this time, since the entire lifting cylinder 8 also lowers the auxiliary hand 13, the auxiliary hand lifting mechanism unit 14 causes the auxiliary hand 1 to move at the same speed and at the same speed when the entire lifting cylinder 7 is effective.
3 is raised. As a result, the auxiliary hand 13 can keep the position of the shield segment 1 with respect to the fastening bolt hole 5 constant.

When the bolt fastening hand 8 descends to a predetermined position, the bolt hand moving cylinder 9 continues to move the bolt fastening hand 11 and the auxiliary hand 13 along the axis of the bolt fastening hole 5 toward the nut fastening hand 9. As a result, the fastening bolt 4 is inserted from the tip into the fastening bolt hole 5 of the shield segment 1 as shown in FIG.

When the fastening bolt 4 is inserted into the fastening bolt hole 5 of the shield segment 1 by a predetermined amount, the bolt hand moving cylinder 9 stops the movement of the bolt fastening hand 11 and the auxiliary hand 13. The bolt gripping portions 16a and 17a of the auxiliary hand 13 release the gripping of the fastening bolt 4 as shown in FIG. 5 (e), and the auxiliary hand lifting mechanism 14 places the bolt gripping portions 16a and 17a on the bolt box 1a. To raise. At this time, the fastening bolt 4 may shift in the pulling-out direction or its posture may change. However, since the bolt fastening hand 11 is immediately behind the head of the fastening bolt 4, it comes out of the fastening bolt hole 5 of the shield segment 1. It never falls. In this way, since the auxiliary hand 13 inserts the fastening bolt 4 into the fastening bolt hole 5, it is not necessary to fix the fastening bolt 4 by putting a rubber agent or the like into the fastening bolt hole 5.

When the bolt fastening hand 8 moves up to a predetermined position, the bolt hand moving cylinder 9 starts moving the bolt fastening hand 11 and the auxiliary hand 13 again. As a result, the fastening bolt 4 penetrates the fastening bolt hole 5 as shown in FIG.
It is transferred until it hits the wall surface of. At this time, even if the fastening bolt 4 is inclined, it can be inserted along the fastening bolt hole 5 because it is pushed by the bolt fastening hand 11.

The nut fastening hand 12 has a nut 20 at the tip.
A fastening rotation portion 12b that grips and rotates in the fastening direction and a fastening rotation transmission mechanism portion (not shown) that transmits the rotation of the fastening motor to the fastening rotation portion 12b. When the fastening bolt 4 penetrates the fastening bolt hole 5, the nut hand moving cylinder 10 becomes
Move the nut fastening hand 12 that grips the nut 20 in advance with the fastening rotating portion 12b toward the bolt fastening hand 11,
The nut 20 is pressed against the fastening bolt 4. Further, the nut fastening motor 12a rotates the fastening rotating portion 12b in the fastening direction. At this time, the head of the fastening bolt 4 is not locked to the bolt fastening hand 11 and is held by the wall surface of the bolt box 1a. In this state, the nut 20 is pressed against the fastening bolt 4 and is rotated in the fastening direction, so that the nut 20 gradually accumulates in the fastening bolt 4 as shown in FIG. Rotate itself. When the fastening bolt 4 rotates, the bolt fastening hand 11 has the square hole 15 in the shape of the head of the fastening bolt 4, so that the head of the fastening bolt 4 eventually fits into the square hole 15 of the bolt fastening hand 11. As described above, since a special mechanism for fitting the head of the fastening bolt 4 to the bolt fastening hand 11 is not required, the bolt fastening hand 11 and the like can have a simple structure, and the bolt fastening hand 11 can be miniaturized. Also, the weight can be reduced. Therefore, the installation area of the bolt fastening hand 11 is not required to be wide, and the manufacturing cost can be reduced.

After the fastening bolt 4 is fitted into the bolt fastening hand 11, the fastening rotation operation of the nut 20 is continued, so that the fastening bolt 4 and the nut 20 are tightened with a predetermined torque as shown in FIG. 6C. Can be concluded.

When the fastening of the fastening bolt 4 and the nut 20 is completed, as shown in FIG. 6D, the bolt hand moving cylinder 9 and the nut hand moving cylinder 10 separate the bolt fastening hand 11 and the nut fastening hand 12 from each other. After the movement, the entire lifting cylinder 8 has the bolt fastening hand 11, the nut fastening hand 12, and the pull-out auxiliary hand 14.
To return to the initial position. As a result, the shield segment 1 and the shield segment 2 are fastened by the fastening bolt 4 and the nut 20.

In this way, the head of the fastening bolt 4 is held in advance by the temporary bolt retainer 6 provided on the wall surface of the bolt box 1a facing the fastening bolt hole 5, and at the time of fastening, the temporary bolt retainer 6 on the wall surface of the bolt box 1a is held. The fastening bolt 4 previously held in the fastening bolt 4 is pulled out from the temporary bolt holding tool 6, the pulled fastening bolt 4 is transferred into the fastening bolt hole 5 and inserted, and the nut 20 is inserted from the opposite side of the fastening bolt hole 5 into which the fastening bolt 4 is inserted. Since they are fitted and rotated and fastened, the fastening bolts 4 can be supplied with a simple mechanism, and it is not necessary to insert a rubber material or the like into the fastening bolt holes 5 that are the fastened portions. The joint strength can be increased without the generation of internal pressure.

In the above embodiment, the arms 16 and 17 of the auxiliary hand 13 are moved by one fulcrum.
Alternatively, each of the arms 16 and 17 may have a fulcrum as shown in the side view of FIG.

[0031]

As described above, according to the present invention, a concave portion which is slightly larger than the head portion of the fastening bolt provided in advance is provided on the wall surface of the bolt box facing the fastening bolt hole of the shield segment, and the concave portion is provided inside the concave portion. Equipped with an elastic ring,
Since the fastening bolt head is temporarily held and the fastening bolt is supplied to the bolt fastening device, the joint strength can be increased without increasing the diameter of the fastening bolt hole in the fastened portion of the shield segment.

Further, the auxiliary hand elevating mechanism lowers the auxiliary hand to the concave portion provided on the wall surface of the bolt box, and the auxiliary hand grips the fastening bolt held in the concave portion of the wall surface of the bolt box, and together with the bolt fastening hand. It moves toward the fastening bolt hole, transfers the fastening bolt to the fastening bolt hole, and the bolt fastening hand inserts the fastening bolt transferred by the auxiliary hand into the fastening bolt hole, so that the bolt fastening hand does not need to grip the bolt. The mechanism of the bolt fastening hand can be simplified.

[Brief description of drawings]

FIG. 1 is a side view of a bolt fastening device showing an embodiment of the present invention.

FIG. 2 is a sectional view of a concave portion of a shield segment.

FIG. 3 is a side view of a bolt grip portion.

FIG. 4 is a cross-sectional view of a groove at the tip of a bolt grip portion.

FIG. 5 is an operation process diagram showing an operation of inserting the fastening bolt into the fastening bolt hole.

FIG. 6 is an operation process diagram in the case of fastening with fastening bolts inserted into fastening bolt holes.

FIG. 7 is a side view showing another embodiment of the bolt grip portion.

[Explanation of symbols]

 1 Shield Segment 1a Bolt Box 3 Bolt Fastening Device 4 Fastening Bolt 5 Fastening Bolt Hole 6 Bolt Temporary Holder 6a Concave 6b Elastic Ring 11 Bolt Fastening Hand 12 Nut Fastening Hand 13 Auxiliary Hand 14 Auxiliary Hand Lifting Mechanism 16 Arm 16a Bolt Grip 17 Arm 17a Bolt Grip 18 Arm open / close mechanism

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Junichi Shibano 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nihon Steel Pipe Co., Ltd.

Claims (2)

[Claims] 1. A temporary retainer for fastening bolts for fastening and fixing adjacent shield segments, the concave portion being one size larger than the head of the fastening bolt provided on the wall surface of the bolt box facing the fastening bolt hole of the shield segment. And a temporary bolt retainer for a shield segment, which is provided with an elastic body ring that is fixed inside the recess and holds the fastening bolt head. 2. A bolt fastening in which a bolt fastening hand and a nut fastening hand are oppositely attached to a fastening device main body having a drive mechanism portion that moves horizontally and vertically, and adjacent shield segments are fastened and fastened with fastening bolts and nuts. The device is provided with an auxiliary hand and an auxiliary hand lifting / lowering mechanism part, and the auxiliary hand has a bolt gripping part consisting of a groove to be fitted with a fastening bolt at a tip part of a pair of opening and closing arms, and a pair of arms at a rear end part. It has an arm opening and closing mechanism that opens and closes,
A concave shape that is installed between the bolt fastening hand and the nut fastening hand on the side of the bolt fastening hand on the side close to the bolt fastening hand and is one size larger than the head of the fastening bolt provided on the wall surface of the bolt box facing the fastening bolt hole of the shield segment. Portion and the recessed portion, the fastening bolt held by the bolt temporary holding tool having the elastic body ring for holding the fastening bolt head is pulled out and transferred to the fastening bolt hole, and the auxiliary hand elevating mechanism portion is the bolt fastening hand. A bolt fastening device, which is installed in the fastening device main body on the side close to the bolt fastening hand between the nut fastening hand and the nut fastening hand to raise and lower the auxiliary hand.