JPH0743276Y2 - Circular segment holding device for shield machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Field of the Invention The present invention relates to a segment roundness retaining device for retaining a rear assembled segment in a shield machine.

Prior Art FIGS. 4 and 5 show an example of a conventional perfect circle holding device. This is provided with trolleys 24 movable on both left and right sides of a rear workbench 22 arranged at the rear of the shield body 21 via guide rails 23 in the front-rear direction, and a jack device that is vertically expandable and contractible on each trolley 24. A pillar 26 having 25 is provided upright, and an arc-shaped segment pressing member 28 is supported over the operating ends of both jack devices 25 via horizontal pins 27 in the front-rear direction. Then, the carriage 24 is reciprocally moved within a predetermined range by connecting piston rods of moving cylinders 29 arranged on the rear working table 22, respectively. And jack device 25
The segment pressing member 28 is raised by means of this to maintain the circularity of the segment 30 assembled by the segment assembling device and push up and support it from below.

However, according to the above-mentioned conventional configuration, since the segment pressing member 28 is connected to the working end of the jack device 25 via the horizontal pin, it may rock to the left or right and the cart 24 may fall. There is. Therefore, it is necessary to make the left and right carriages 24 completely independent. Therefore, in the conventional example, two guide rails 23 that guide each carriage 24 are laid at predetermined intervals. As a result, the width and length of each carriage 24 are increased and the weight thereof is increased. Therefore, the working space of the rear worktable 22 is narrowed and the rigidity of the rear worktable 22 must be increased.

The present invention solves the above problems and can reduce the size and weight of the trolley structure for supporting the segment pressing member, which can increase the work space of the rear worktable and reduce the rigidity of the rear worktable. It is an object to provide a perfect circle holding device.

Means for Solving the Problems In order to solve the above problems, the present invention provides a pair of left and right guide rails parallel to each other on a rear workbench of a shield body in a front-rear direction, and can reciprocate on both guide rails. Segments in a shield machine, in which a trolley is provided, and a stanchion equipped with an expandable and retractable jack device is erected on each of the trolleys, and a segment pressing member is supported between the operation rod tips of the jack devices. In the perfect circle holding device, the segment pressing member is connected to the operation rod tip portion of the jack device via a horizontal pin in the front-rear direction, and the operation rod of the jack device is configured to be rotatable about its axis, The two columns are connected to each other by a horizontal beam, and the connecting portion between the columns and the horizontal beam is rotatable only around the vertical axis. .

Effect According to the above configuration, since the trolleys of both dollies can be made independent by connecting the stanchions of both dollies with the cross beam, it is not necessary to make the dolly self-supporting, and the dolly is downsized and lightweight. Therefore, the work space of the rear workbench can be widely and effectively used. Moreover, since the horizontal beam is rotatably connected to the column around the vertical axis, even if the amount of movement of both carriages shifts, the horizontal beam can be tilted back and forth to absorb the movement, and smooth movement of the carriage can be achieved. You can secure the work to hold the circle.

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

In FIGS. 1 and 2, reference numeral 1 denotes a rear workbench arranged in the shield body 2, and a discharging device 3 for discharging excavated earth and sand is arranged in the front-rear direction in the central portion. On the pair of left and right support frames 1a on the side of the soil discharging device 3 of the rear workbench 1, one guide rail 4 is laid in parallel with each other in the front-rear direction. A truck 6 having front and rear wheels 5A and 5B is arranged on each of the guide rails 4. Cylindrical pillars 7 are erected on these carriages 6, and lifting jacks 9 are arranged between the lifting members 8 and the carriages 6 in the pillars 7, and the jack body 9a is a bracket on the carriage 6. The operating rod 9b is pin-connected to the lower end of the elevating member 8. The elevating member 8 is covered with a cover cylinder 10 slidably fitted in the support column 7 to prevent dirt and sand from entering the support column 7.

Mounting ribs 11a provided on both lower sides of the arc-shaped segment pressing member 11 are connected to the bracket 8a arranged at the upper end of each elevating member 8 via horizontal pins 12 in the front-rear direction,
A segment pressing member 11 is supported over both columns 7. By thus connecting the elevating member 8 and the segment pressing member 11 via the horizontal pin 12, the segment pressing member 11 can be swung to absorb the stroke difference. The segment pressing member 11 can be moved up and down without being driven well in synchronism, and the drive control of the lifting jack 9 can be simplified.
Even if it hits one side of 16, segment pressing member
11 tilts about the horizontal pin 12 to bring the entire contact surface into contact with the inner surface of the segment 16, and the segment 16 can be held with an even supporting force. A connecting ring 13 is rotatably fitted on the upper part of each of the columns 7, and a cross beam 14 is connected between the connecting rings 13. The horizontal beam 14 is fixed to a position facing the connecting ring 13 and extends vertically, and a vertical member 14a.
Connecting ring 1 with the cross member 14b connected and fixed between the upper ends of 4a
It is formed in a shape that bypasses the space between the three upwards and is configured to avoid contact with the soil discharging device 2.

In FIG. 2, reference numeral 15 denotes a pair of left and right truck slide jacks, which are fixed to the front upper surface of each support frame 1a, and the operating rod 15a is pin-connected to the front portion of the truck 7 so that the truck 7 is indicated by an imaginary line. And reciprocate within a predetermined range. Reference numeral 16 is a segment assembled in a ring shape by a segment assembling device (not shown) arranged at the rear portion of the shield body 2.

In the above configuration, when the shield machine excavates a predetermined distance and moves forward, the excavation is stopped and a new segment 16 is assembled in a ring shape at the front of the existing segment 16 by the segment assembly device. On the other hand, in this perfect circle holding device, the carts 6 are moved by the expansion and contraction of the truck sliding jacks 15 to position the segment pressing member 11, and the lifting jacks 9 are moved.
The segment pressing member 11 is pressed against the inner wall surface of the existing segment 16 from below to support the upper segment 16 and maintain circularity. At this time, the truck sliding jacks 15 are expanded and contracted in synchronization, but even if there is some difference in the operation of the respective operating rods 15a, the connecting ring 13 is placed around the column 7 as shown by the phantom line in FIG. Rotate and cross beam 14
By tilting forward and backward, smooth movement is possible, and even when stopped at this position, the segment pressing member 11 can be smoothly raised to function.
The segment pressing member 11 also tilts back and forth, but this is because the cover cylinder 10 is rotatably fitted to the support column 7,
This is allowed when the operating rod 9b of the lifting jack 9 rotates about the axis.

Effect of the Invention According to the present invention as described above, since the columns that are erected on the bogie are connected by the cross beams, it is not necessary for each bogie to have self-sustainability, so that the guide rail of the bogie is singular. The trolley can be made smaller and lighter, and as a result, the rear workbench space can be increased, workability can be improved, and the workbench structure can be simplified. Furthermore, since the columns and cross beams are rotatably connected about the vertical axis, even if the amount of movement of each dolly deviates somewhat, the cross beams can be tilted back and forth to allow for smooth movement of the dolly. Performs perfect circle maintenance work. Of course, the horizontal pin makes it possible to simplify the drive control of the jack device and to secure an even supporting force by the segment pressing member.

[Brief description of drawings]

1 to 3 show an embodiment of the present invention. FIG. 1 is a rear view of a perfect circle holding device with a part thereof cut away, FIG. 2 is a side view thereof, and FIG. 3 is a plan view thereof. 4 and 5 are a front view and a side view showing a conventional example. 1 ... Rear workbench, 2 ... Shield body, 4 ... Guide rail, 6 ... Bogie, 7 ... Pillar, 9 ... Lifting jack, 11 ... Segment pressing member, 12 ... Horizontal pin, 13 …
… Connecting ring, 14 …… Horizontal beam, 15 …… Jack for sliding cart, 16 …… Segment.

Claims (1)

[Scope of utility model registration request] 1. A pair of left and right guide rails parallel to each other are provided on the rear workbench of the shield main body in the front-rear direction, and reciprocally movable carriages are provided on these both guide rails, and the workbench is expanded and contracted upward respectively. A segment roundness holding device in a shield machine, in which a column equipped with a free jack device is erected, and a segment pressing member is supported between the operating rod tip parts of the both jack devices, the operating rod tip of the jack device. While connecting the segment pressing member to the section via the horizontal pin in the front-back direction,
The operating rod of the jack device is configured to be rotatable about its axis, the columns are connected to each other by a horizontal beam, and the connecting portion between the column and the horizontal beam is rotatable only about the vertical axis. A perfect circle holding device for a segment in a shield machine.