JP3840800B2 - Cotter driving device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cotter driving device.
[0002]
[Prior art]
In the case of building a long underground hole such as a tunnel, a shield method has been conventionally used. In the shield method, a hole formed by a shield machine has an arc shape in a circular shape and a planar shape. However, by attaching a plurality of rectangular segments, the segments are assembled into an annular shape, which is sequentially performed in the direction of travel of the shield machine with the progress of the shield machine, thereby completing the underground hole.
[0003]
As shown in FIGS. 3 to 6, the segment assembling apparatus for assembling the segment 1 is provided with a suspension beam 3 that is movable in the radial direction of the rotating frame 2 on a rotating frame 2 that can rotate in the circumferential direction. The slide frame 4 is attached to the suspension beam 3 so as to be movable in the axial center direction of the rotary frame 2. The spherical bearing 5 is attached to the spherical bearing 5 that forms a fulcrum provided at a predetermined position of the slide frame 4. A swing frame 6 is attached so as to be swingable in any direction as a center, and a segment gripping means 7 for gripping the segment 1 is disposed on the swing frame 6.
[0004]
The rotary frame 2 is supported by a plurality of support rollers 10 arranged in parallel with the cylindrical frame 9 in the rear end portion of the cylindrical frame 9 of the shield machine 8 and driven by a driving device (not shown). It can be rotated in the circumferential direction.
[0005]
The suspension beam 3 is attached so as to hang over a lower end of a guide rod 12 which is attached to the front ends of left and right brackets 11 projecting rearward of the rotating frame 2 so as to be movable up and down (advancing and retreating). 11, a trunnion-type fluid pressure cylinder 13 is vertically mounted, and the tip of the piston rod 13a of the fluid pressure cylinder 13 is connected to the suspension beam 3, and is suspended by the expansion and contraction operation of the fluid pressure cylinder 13. The beam 3 can be moved up and down (moved in the radial direction of the rotating frame 2) while being guided by the guide rod 12.
[0006]
The slide frame 4 is movably disposed through a slide guide block 15 with respect to a pair of left and right guide rods 14 disposed on the lower surface side of the suspension beam 3 so as to extend in the axial direction of the rotary frame 2. It can be moved in the axial direction of the rotary frame 2 by an expansion / contraction operation of a fluid pressure cylinder (not shown) arranged in parallel with the guide rod 14.
[0007]
The swing frame 6 is attached via a spherical bearing 5 and a pin 17 to the center position of a connecting block 16 that connects the middle portions of the left and right sliding guide blocks 15 of the slide frame 4. The front and rear positions of the bottom surface of each sliding guide block 15 and the four corners of the bottom surface of the swing frame 6 are connected by four connecting jacks 20 via pins 18 and a spherical bearing 19. Thus, the posture is freely corrected by swinging in an arbitrary direction around the spherical bearing 5.
[0008]
The segment gripping means 7 includes a pair of front and rear elevating jacks 21 pivotally attached to the upper end of the swing frame 6, and a rotating frame 2 while being pivotally attached to the distal end of the elevating jack 21 and guided by a guide rod 22. And an elevating block 23 that can be moved up and down (advanced and retracted) in the radial direction. The elevating block 23 has a gripping hole 24 (see FIG. 5) formed in the center portion of the inner peripheral surface of the segment 1. A gripping shaft 25 that can be inserted into and engaged with the reference shaft 25 is rotatably provided.
[0009]
That is, the gripping hole 24 of the segment 1 has an elongated opening in the axial direction of the rotating frame 2 at the inlet portion, but the inside is widened in the circumferential direction of the rotating frame 2. The lower end portion of the gripping shaft 25 is rotated by about 90 ° after the lower end portion of the gripping shaft 25 having a planar shape substantially equal to the opening shape of the entrance portion of the gripping hole 24 is inserted into the gripping hole 24. The segment 1 can be suspended by engaging with the gripping hole 24.
[0010]
Here, the rotation operation of the gripping shaft 25 is performed by rotating the pinion 26 externally fitted to the gripping shaft 25 by the reciprocating operation of the rack 27 meshing with the pinion 26, as shown in FIG. The rack 27 is accommodated in a cylinder cover 28 attached to the elevating block 23 and can be reciprocated by a fluid pressure through piston portions 29 at both ends.
[0011]
Further, two fixed jacks 30 are penetrated and fixed on the left and right sides of the gripping shaft 25 of the segment gripping means 7 on the lower surface side of the swing frame 6, and the segment 1 is attached to the gripping shaft 25 of the segment gripping means 7. In a suspended state, the distal end portion of each fixed jack 30 is stretched and pressed against the concave portion of the inner peripheral surface of the segment 1 so that the segment 1 can be held without wobbling.
[0012]
Furthermore, segment fastening means 31 for fastening the circumferential end surfaces of the newly installed segment 1 and the existing segment 1 to each other is attached to the left and right side portions of the swing frame 6. Although not shown in the drawing, segment fastening means for fastening the axial end surfaces of the newly established segment 1 and the existing segment 1 to each other is also attached to the swing frame 6 at an appropriate position.
[0013]
In the figure, reference numeral 32 denotes a shield jack of the shield machine 8. The shield jack 32 is extended, and the block 33 attached to the tip of the rod is pressed against the face side end surface of the segment 1, thereby shielding the tunnel during tunnel excavation. The reaction force of the excavator 8 is received.
[0014]
When assembling the segment 1 in the hole excavated by the shield machine 8 using the segment assembling apparatus as described above, the segment 1 mounted on the segment supply apparatus (not shown) is moved by the segment gripping means 7 of the swing frame 6. After the suspension, when the fixed jack 30 is stretched and pressed against the inner peripheral surface of the segment 1, the segment 1 is held without wobbling.
[0015]
Subsequently, the rotary frame 2 is rotated to the circumferential position where the segment 1 is to be attached, if necessary, and the slide frame 4 is moved forward along the guide rod 14 by a required amount, and then the suspension beam 3 is rotated. The frame 2 is moved to the outer peripheral side in the radial direction, and the slide frame 4 is moved back along the guide rod 14 by a required amount, so that the new segment 1 is arranged adjacent to the existing segment 1.
[0016]
Here, the segment 1 gripped by the segment gripping means 7 as described above is once moved forward, then moved to the outer peripheral side in the radial direction of the rotating frame 2, and moved back again. This is because when the segment 1 is simply moved to the radially outer periphery side, both ends in the circumferential direction of the segment 1 interfere with the ends of the existing segment 1.
[0017]
At this time, regarding the segment 1 gripped by the segment gripping means 7, it is necessary to correct the yawing, rolling and pitching postures with respect to the existing segment 1.
[0018]
The yawing, rolling, and pitching of the segment 1 referred to here means three-way swinging of the segment 1 with respect to the spherical bearing 5, and the yawing is centered on the axis extending in the radial direction of the rotating frame 2. 5 is a swing indicated by an arrow A in FIG. 5, and rolling is a swing indicated by an arrow B in FIG. 5 centering on an axis extending in the axial center line direction of the rotating frame 2. Pitching is a swinging movement indicated by an arrow C in FIG. 5 centering on an axis (axis extending in the tangential direction of the rotating frame 2) perpendicular to both the yawing rocking axis and the rolling rocking axis. That is.
[0019]
The yawing, rolling, and pitching of the segment 1 is allowed by free swinging on the swing frame 6 side with the spherical bearing 5 as a fulcrum with respect to the slide frame 4 side. As for the pitching, the expansion / contraction amount of the connecting jack 20 that connects the slide frame 4 and the swinging frame 6 is individually adjusted and corrected. Also, regarding the yawing of the segment 1, the rolling and pitching of the segment 1 are performed. After being corrected as appropriate, the slide frame 4 is moved so as to be pushed along the end face of the existing segment 1 for correction.
[0020]
As described above, when the new segment 1 gripped by the segment gripping means 7 is corrected in yawing, rolling and pitching postures with respect to the existing segment 1 and placed at a predetermined mounting position, the segment fastening means 31 What is necessary is just to fasten with respect to the existing segment 1, and the segment 1 will be assembled in cyclic | annular form by repeating the same operation | work with a segment assembly apparatus.
[0021]
By the way, since the conventional fastening of the segment 1 and the existing segment 1 is generally performed by bolt fastening, a bolt fastening machine has been adopted as the segment fastening means 31 of the segment assembling apparatus described above. However, in recent years, for the purpose of simplifying the fastening method, etc., a cotter is driven into the joint groove formed in the boundary portion between the existing segment 1 and the new segment 1 in a joint shape, and the segments 1 are mutually connected by a wedge action. A fastening method has already been developed, and it is considered to adopt a cotter driving device as the segment fastening means 31 of the segment assembling device in place of the bolt fastening machine.
[0022]
However, in most cases, the fastening between the segments 1 using such a cotter is performed manually. For example, an operator holds a cotter driving device 34 as shown in FIG. The cotter 36 temporarily provisionally struck in the fastening groove 35 in the boundary portion is completely driven by the cotter driving device 34 so that the segments 1 are fastened together.
[0023]
In the conventional cotter driving device 34 shown in the figure, a sleeve-like holder 40 is attached to the tip of a cylinder 39 of a driving jack 38 provided with a piston rod 37 for driving the cotter 36 so as to be extendable and contractable. A base end portion of a lever 42 having a hooking claw 43 which can be hooked to an overhang portion 47a formed at an entrance side edge portion of the fastening groove 35 at the tip end portion of the bracket 41 projecting on both sides. Are pivotally attached to each other via pins 44, and each lever 42 is urged by a compression spring 45 in a direction in which the distal ends thereof are separated from each other. The protruding and retracting rod 46 is defined against the elastic force of the compression spring 45, and the protruding and retracting operation of the protruding and retracting rod 46 is performed by a cam shape formed on the outer surface of the piston rod 37. It is.
[0024]
Then, when the tip of each lever 42 is inserted into the fastening groove 35 and the piston rod 37 is advanced, each retracting rod 46 is immersed inside the holder 40 due to the cam shape of the outer surface of the piston rod 37, and each lever. The front end portions of the levers 42 are opened in directions away from each other by the elastic force of the compression spring 45, and the hooking claws 43 of the levers 42 are hooked on the entrance side edge portions of the fastening grooves 35. The cotter 36 can be driven by the piston rod 37 by taking a reaction force by latching the pawl 43 against the fastening groove 35.
[0025]
Here, the fastening groove 35 is formed by fastening hardware 47 embedded in each end face portion of the segments 1 to be fastened, and the fastening hardware 47 opens mainly on the end face side of the segment 1. It has a substantially C-shaped flat cross-sectional shape (see FIG. 8A), and when the end faces of the segments 1 are brought into contact with each other, a fastening groove 35 having a substantially H-shaped planar shape is formed by the fastening hardware 47 of both. In this way, the width dimension of the portions 47b that are brought into contact with each other in each of the fastening hardware 47 is gradually reduced toward the counter driving direction of the cotter 36.
[0026]
Further, the cotter 36 driven into the fastening groove 35 has a substantially H-shaped planar shape (see FIG. 8B) in which thick portions 36a are formed on both sides thereof, and is sandwiched between the thick portions 36a. The width dimension of the thin wall portion 36b is gradually increased in the driving direction of the cotter 36, and when the cotter 36 is driven into the fastening groove 35, the fastening hardware 47 is attracted to each other by a wedge action. Thus, the segments 1 are brought into close contact with each other to be fastened together.
[0027]
[Problems to be solved by the invention]
However, since such a conventional cotter driving device 34 is used manually, the relative attitude of the cotter driving device 34 with respect to the segment 1 side to be fastened is freely adjusted to do something. Although the fastening operation could be performed without any trouble, if this is employed as it is as the segment fastening means 31 of the segment assembly device described above, the assembly error of the cotter driving device 34 with respect to the segment assembly device or the segment 1 side When the relative position and driving angle of the cotter driving device 34 with respect to the fastening groove 35 do not match due to production errors of the fastening hardware 47 and the gripping hole 24 in FIG. The reaction force is not evenly distributed to 43, and a large reaction force is applied only to one of the latching claws 43 to concentrate stress on the lever 42 on one side and its holding portion. There is a possibility that that damage occurs.
[0028]
The present invention has been made in view of the above circumstances, and when the cotter driving device is adopted as the segment fastening means of the segment assembly device, the relative position and driving angle of the cotter driving device with respect to the fastening groove are somewhat The purpose is to prevent the lever and its holding portion from being damaged due to stress concentration even if they are displaced so that the reaction force is equally distributed to the latching claws of each lever.
[0029]
[Means for Solving the Problems]
The present invention is a cotter driving device that drives a cotter into a joint groove formed in a boundary portion between an existing segment and a new segment and fastens the segments by a wedge action,
The piston rod for driving the cotter is telescopically attached to both ends of the link where the central portion in the longitudinal direction is swingably attached to the tip of the cylinder of the driving jack. The link is provided with a swinging means for swinging the base end portions of the levers formed with possible latching claws on the outer side of the distal end portion and swinging the levers so that the distal end portions of the levers approach and separate from each other. It is characterized by.
[0030]
Therefore, according to the present invention, the levers are closed by the swinging means so that the tip portions are close to each other, and the tip portions of the levers are inserted into the fastening grooves, and the tip portions of the levers are separated from each other by the swinging means. When the levers are opened in this way, the latching pawls of the levers are latched on the entry side edge of the fastening grooves. It becomes possible to drive a cotter.
[0031]
At this time, even if the relative position of the cotter driving device with respect to the fastening groove and the driving angle are slightly deviated, the link swings due to the reaction force acting on one of the hooking claws. Since the reaction force is distributed to the other latching claw by the swinging of the two and the reaction force acting on both the latching claws is balanced, the reaction force can be equally distributed to the latching claws of each lever. .
[0032]
Further, in the present invention, it is preferable that a gripping claw capable of hooking an appropriate position of the cotter is formed on the inner side of the tip portion of each lever. By closing the cotters so as to be close to each other, the appropriate position of the cotter can be hooked and gripped by the gripping claws, and even the operation of inserting the cotter into the fastening groove can be performed by the cotter driving device.
[0033]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0034]
FIG. 1 and FIG. 2 show an example of an embodiment for carrying out the present invention. The parts denoted by the same reference numerals as those in FIG. 7 and FIGS. 8A and 8B represent the same items, and FIG. FIG. 2 is a front view of the cotter driving device 48 according to the invention, and FIG. 2 is a side view thereof.
[0035]
In the illustrated cotter driving device 48, the piston rod 49 is slidably inserted into the tip of a cylinder 51 of a driving jack 50 provided with a piston rod 49 for extending the cotter 36 so as to be extendable and downward. A holder 52 having a convex front shape is attached to the front and rear positions (left and right positions in FIG. 2) of the lower portion of the holder 52, and the joint directions of the segments 1 (left and right directions in FIG. 1). The center portions in the longitudinal direction of the pair of front and rear links 53 extending in the direction are pivotably attached via pins 54, and both end portions of both links 53 are connected to each other by connecting shafts 55 to intermediate portions of the connecting shafts 55. The base end portions of the pair of left and right levers 56 are pivotably attached.
[0036]
Here, on the outer side of the front end of each lever 56, there is an overhang 47 a at the entrance edge of the fastening groove 35 formed by the fastening hardware 47 at the boundary between the existing segment 1 and the new segment 1. A latching claw 57 that can be latched is formed, and a gripping claw 58 that can latch the neck portion 36 c formed at the upper end portion of the cotter 36 is formed inside the tip of each lever 56. .
[0037]
Further, both end portions of the both links 53 are also connected by an inverted U-shaped bracket 59 (see FIG. 2) that is disposed outside the connecting shafts 55 and detours upward so as not to interfere with the levers 56. Opening / closing jacks 60 (swinging means) for swinging the levers 56 so that the tip portions of the brackets 56 are brought close to and away from each other are pivotally attached to the upper intermediate portions of the brackets 59 via pins 61, respectively. The tip end portion of the piston rod 62 of each open / close jack 60 and the bracket 63 protruding from the base end portion of each lever 56 are connected via a pin 64.
[0038]
Incidentally, R in the figure is an elastic member interposed in the swing clearance portion of both links 53 so as to prevent the backlash of both links 53.
[0039]
The cotter driving device 48 configured as described above is fixed to the base plate 65 disposed on the back side thereof via the holder 52, and the base plate 65 is described above with reference to FIGS. A bracket 67 that is slidably attached to the guide rail 66 disposed on the swing frame 6 side of the segment assembling apparatus and protrudes from the lower end of the back surface of the base plate 65 is disposed in parallel with the guide rail 66. It can be moved in the radial direction of the rotating frame 2 (see FIG. 3) by an expansion / contraction operation of a fluid pressure cylinder (not shown).
[0040]
Thus, the levers 56 are closed by the opening / closing jacks 60 so that the tips of the levers 56 are close to each other, so that the neck portion 36c of the cotter 36 is hooked and held by the holding claws 58. When the cotter 36 and the tip of each lever 56 are inserted into the fastening groove 35 and moved to the segment 1 side together with the fastening groove 35, and each lever 56 is opened by the open / close jack 60 so that the tip is separated from each other, The latching claw 57 of each lever 56 is latched by the overhang 47a at the entrance edge of the fastening groove 35, and the gripping by the gripping claw 58 of the cotter 36 is released. It becomes possible to drive the cotter 36 with the piston rod 49 by taking a reaction force by the hooking of the claw 57 to the fastening groove 35.
[0041]
At this time, even if the relative position and the driving angle of the cotter driving device 48 with respect to the fastening groove 35 are slightly deviated, the link 53 swings due to the reaction force acting on one of the hooking claws 57. Since the reaction force is distributed to the other latching claw 57 by the swing of the link 53 and the reaction force acting on both the latching claws 57 is balanced, the reaction force is applied to the latching claw 57 of each lever 56. It becomes possible to share equally.
[0042]
Therefore, according to the above embodiment, even if the relative position and driving angle of the cotter driving device 48 with respect to the fastening groove 35 are slightly shifted, the reaction force is equally distributed to the latching claws 57 of the levers 56. Therefore, it is possible to prevent the lever 56 and its holding portion from being damaged due to stress concentration, and it is possible to realize the cotter driving device 48 suitable for being employed as the segment 1 fastening means of the segment assembling device. .
[0043]
In particular, in the present embodiment, since the gripping claws 58 capable of hooking the upper end portion of the cotter 36 are formed inside the tip portions of the levers 56, the tip portions of the levers 56 are brought close to each other by the opening / closing jack 60. By closing in this manner, the neck portion 36c of the cotter 36 can be hooked and gripped by the gripping claws 58, and even the operation of inserting the cotter 36 into the fastening groove 35 can be performed by the cotter driving device 48. it can.
[0044]
Note that the cotter driving device of the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention.
[0045]
【The invention's effect】
According to the above-described cotter driving device of the present invention, the following various excellent effects can be obtained.
[0046]
(I) According to the invention described in claim 1 of the present invention, even if the relative position and driving angle of the cotter driving device with respect to the fastening groove are slightly shifted, reaction force is applied to the latching claws of each lever. Since it can be equally distributed, it is possible to prevent damage to the lever and its holding part due to stress concentration, and to realize a cotter driving device suitable for use as a segment fastening means of a segment assembly device Can do.
[0047]
(II) According to the invention described in claim 2 of the present invention, since the gripping claw capable of hooking the appropriate position of the cotter is formed inside the tip of each lever, each lever is By closing the parts so as to be close to each other, it is possible to hold and hold the appropriate position of the cotter with a gripping claw, and even the operation of inserting the cotter into the fastening groove can be performed with the cotter driving device.
[Brief description of the drawings]
FIG. 1 is a front view showing an example of an embodiment for carrying out the present invention.
FIG. 2 is a side view of FIG.
FIG. 3 is a front view showing an example of a segment assembling apparatus.
4 is a side view of FIG. 3. FIG.
FIG. 5 is an enlarged view of a main part of FIG. 3;
6 is a view taken in the direction of arrows VI-VI in FIG. 5;
FIG. 7 is a front view showing an example of a conventional cotter driving device.
8A is an arrow view of the fastening hardware viewed from the VIII-VIII direction of FIG. 7, and FIG. 8B is an arrow view of the cotter viewed from the VIII-VIII direction of FIG.
[Explanation of symbols]
1 segment 35 fastening groove 36 cotter 47a overhang part (entrance side edge part)
48 cotter driving device 49 piston rod 50 driving jack 51 cylinder 53 link 56 lever 57 latching claw 58 gripping claw 60 opening / closing jack (swinging means)

Claims (2)

A cotter driving device for driving a cotter into a joint groove formed at a boundary portion between an existing segment and a new segment and fastening the segments together by a wedge action,
The piston rod for driving the cotter is telescopically attached to both ends of the link where the central portion in the longitudinal direction is swingably attached to the tip of the cylinder of the driving jack. The link is provided with a swinging means for swinging the base end portions of the levers formed with possible latching claws on the outer side of the distal end portion and swinging the levers so that the distal end portions of the levers approach and separate from each other. A cotter driving device characterized by 2. The cotter driving device according to claim 1, wherein a gripping claw capable of hooking an appropriate position of the cotter is formed inside a tip portion of each lever.

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