JPH0442396Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a moving device for a perfect circle holding device that holds segments in a perfect circle on an inner circumferential wall of an excavation shaft.

BACKGROUND TECHNOLOGY Conventional roundness holding devices are shown in FIGS. 4 to 5, for example.
As shown in the figure, a pedestal 3 is fixed horizontally at the rear of a shield excavator 2 that moves underground 1, rails 4 are laid on both sides of the pedestal 3, and wheels are movable along the rails 4. 5 were provided on the pair of right and left pillars 6a of the perfect circle holding mechanism 6, and a diagonal member 7 supporting the weight of the perfect circle holding device 6 was provided between the pedestal 3 and the shield excavator 2. Reference numeral 8 denotes a segment that is held in a perfect circle shape by the perfect circle holding mechanism 6 and is attached to the inner circumferential wall 9 of the excavation shaft.

Problems to be Solved by the Invention According to the above-mentioned conventional configuration, since the pedestal 3 is a cantilever beam, many reinforcing members such as the diagonal members 7 are required to support the weight of the perfect circle holding mechanism section 6. This was a problem because it narrowed down the working area in the space behind the shield tunneling machine 2.

The present invention solves the above-mentioned problems, and aims to provide a perfect circle holding device that can effectively utilize the rear space of a shield tunneling machine.

Means for Solving the Problems In order to solve the above problems, the present invention has a pair of left and right struts that are vertically expandable and retractable, and that the opposite sides of the struts are rotatable around a horizontal axis. A pair of perfect circle holding mechanisms provided with rollers are disposed in the front and back direction of the excavation shaft, and an expandable and retractable connecting part is provided between both of the perfect circle holding mechanisms, and is arranged between the left and right support columns, and is arranged at both ends. A pedestal having a groove for guiding and holding the roller in the excavation direction is provided in the pedestal, and the front end or the rear end of the pedestal is swingably connected to the shield excavator or the rear truck.

Operation In the above configuration, the rear perfect circle holding mechanism is operated to be in an extended state, and the other side of the pedestal is supported. Next, the connecting part is extended and pushed forward to the front perfect circle holding mechanism part to operate in the rear extended state. Next, after contracting the rear perfect circle holding mechanism, the rear perfect circle holding mechanism is drawn toward the front perfect circle holding mechanism by contraction of the connecting portion. Repeat the above operations to sequentially move the perfect circle holding mechanism section forward. In this case, the pedestal can be sequentially shaped like a beam supported at both ends or a cantilevered beam with a short distance from the fulcrum to the load point to hold the perfect circle holding mechanism on either side, so the pedestal structure can be simplified. It is possible to expand the work area in the rear space of the shield excavator and improve work efficiency.

Embodiment An embodiment of the present invention will be described below based on the drawings. In FIG. 1, a pair of perfect circle holding mechanisms have a pair of left and right support columns 11 that can be expanded and contracted in the vertical direction, and rollers 13 that are rotatable through a horizontal shaft 12 on opposite sides of both support columns 11. Parts 14a, 14
b is arranged in the longitudinal direction of the excavation shaft, and a moving jack 15 is connected by a pin 16 between both the perfect circle holding mechanism parts 14a and 14b. Left and right pillars 1
A pedestal 20 whose front end is swingably supported by a bracket 18 of a shield excavator 17 via a support shaft 19 is disposed between 1 and 1, and a pedestal 20 is provided on both sides of the pedestal 20 to guide rollers 13 in the excavation direction. Groove 21
As shown in FIG.
a and 14b are guided.

The operation of the above configuration will be explained below.
The support column 11 of the front perfect circle holding mechanism section 14a is extended to hold the segment 22 in a perfect circle, and also supports the rear side of the pedestal 20 via the rollers 13. Next, the moving jack 15 is operated to draw the rear perfect circle holding mechanism part 14b in the contracted state forward. Next, the support 11 of the rear perfect circle holding device 14b is expanded, and the support 11 of the front perfect circle holding mechanism 14a is contracted and pushed forward by the backward movement jack 15. By repeating the above operations, the pair of perfect circle holding mechanism parts 14a, 14
Move b forward. At this time, the pedestal 20 is in a state where both ends are supported by the shield tunneling machine 17 and the rear perfect circle holding mechanism 14b, or the rear side is supported by the front perfect circle holding mechanism 14a, and the supporting point is Two states are sequentially repeated: a cantilever support beam state with a short span that holds the rear perfect circle holding mechanism portion 14b at a position a short distance closer to the rear end of the gantry; Therefore, the strength of the pedestal 20 can be ensured sufficiently without using reinforcing members such as diagonal members as in the past.
The structure can be simplified, the working area of the space behind the shield excavator 17 can be expanded, and workability can be improved.

Next, another embodiment of the present invention is shown in FIG. Third
In the figure, the rear end of the frame 20 is connected to the rear truck 23.
A pair of perfect circle holding mechanisms 14a, 14
b is guided and held, and has the same effect as the previous embodiment.

Effects of the invention As described above, according to the invention, the mount structure is simplified by guiding and holding a pair of perfect circle holding mechanisms with a mount connected on one side to the shield tunneling machine or the rear truck. The work area behind the shield tunnel machine can be expanded and work efficiency improved.

[Brief explanation of the drawing]

Figures 1a and b are front and side views showing one embodiment of the invention, Figures 2a and b are partially enlarged views of Figure 1, and Figure 3 is an overall view of another embodiment of the invention. FIG. 4 is an overall configuration diagram showing a conventional perfect circle holding device, and FIG. 5 is a partially enlarged view of FIG. 4. DESCRIPTION OF SYMBOLS 11... Strut part, 14a, 14b... Perfect circle holding mechanism part, 15... Movement jack, 17... Shield excavator, 20... Frame, 21... Groove part.

Claims (1)

[Scope of utility model registration request] It has a pair of left and right support columns that can be expanded and contracted in the vertical direction,
A pair of perfect circle holding mechanism parts each having a roller rotatable around a horizontal axis are disposed on opposite sides of both the pillar parts in the longitudinal direction of the excavation shaft, and a connecting part that is extendable and retractable between the two perfect circle holding mechanism parts. , a mount is disposed between the left and right support portions and has grooves at both ends for guiding and holding the roller in the excavation direction, and the front end or rear end of the mount is oscillated by a shield excavator or a rear truck. A perfect circle holding device characterized by being freely connected.