JPH04327698A - Shield excavator - Google Patents

Abstract

PURPOSE:To measure a tail clearance with high accuracy by movably arranging a distance measuring equipment measuring the relative position of a segment and a shielding cylinder to a segment assembly device. CONSTITUTION:A rail is installed on the turning ring of an erector device in parallel with the longitudinal direction of a shield excavator 1 while a travelling carrier, on which the distance measuring equipment of a tail clearance measuring device is mounted, is set up to the rail. A distance from a transit 70 to the distance measuring equipment 51 is measured while an angle theta formed by the central axis of a shielding cylinder 2 and a beam R tying the transit 70 and the measuring equipment 51 is acquired, thus calculating the position of a segment.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shield tunneling machine used for constructing underground tunnels.

0002

BACKGROUND OF THE INVENTION Conventionally, in curve construction, the tail clearance between a segment in shield construction and the skin plate of a shield excavator has been measured directly by a human using a scale or the like.

[0003] In this measurement method, a person finishes pressing one ring of a segment, assembles the next segment, goes to a predetermined measurement position, places a scale in the gap between the segment and the skin plate, and visually reads the scale. .

0004

[Problems to be Solved by the Invention] However, in the above-mentioned measuring method, humans take measurements at several locations, which takes time to move.
There was the issue of work being done at heights, which was dangerous.

[0005] This invention was made to solve the above problem, and its purpose is to provide a shield tunneling machine that can quickly and accurately measure the tail clearance between a segment and a skin plate. It is about providing.

[0006]

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a distance measuring device for measuring the relative position of a segment and a shield tube in a segment assembly device in a shield excavator that constructs an underground tunnel. It is characterized by having containers arranged in a movable manner.

[0007]

[Operation] According to the present invention, the distance measuring device is movably disposed on the turning ring of the erector device for assembling the segments, so that the distance measuring device emits light waves, etc. By measuring the time it takes for the segment to hit the shield tube and be reflected, the relative position between the segment and the shield tube can be calculated.
This makes it possible to perform automatic measurements without the need for direct measurements by humans, reducing work time and avoiding dangerous work at heights.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. (First Embodiment) FIGS. 1(a) and 1(b) show the overall structure of a shield tunneling machine according to the present invention.

In the figure, a shield excavator 1 is equipped with an excavation cutter 12 at the front for excavating the ground, and the excavated earth enters a chamber 13 and is removed by a screw conveyor 14, which is an earth removal device. be done. After the earth is removed, the segments 10 are sequentially assembled to construct a tunnel.

[0010] Segments 10 constituting this tunnel are assembled within the shield tunneling machine 1, and the tunnel tunneling machine 1 is equipped with a shield jack 11 that moves the shield tunneling machine 1 forward by using the segments 10 as a reaction force. . When one ring of segments 10 has been dug, the shield jack 11 is pulled back and the next segment is assembled.

This shield tunneling machine 1 has a shield tube 2 made of a steel plate or the like and having a substantially cylindrical shape. Moreover, the erector device 3 is for assembling segments, and is 360
It consists of a swing ring 4 that can be rotated once, an erector 5 that grips and transports segments to an assembly position, a motor 6 that rotates the swing ring 4, and rollers 7 and roller stands 8 that guide the swing ring 4.

A tail clearance measuring device 9 is used to measure the distance, and this device 9 is connected to a distance measuring device 5 which will be described later.
1, and can freely move the measurement range to measure the distance between the segment and the shield cylinder. Furthermore, Figure 1
shows an example of an earth pressure type shield, but it is of course applicable to a muddy water type shield.

Next, the configuration and operating procedure of the tail clearance measuring device 9 will be explained. As shown in FIG. 2(a), first, the rail 50 is attached to the turning ring 4 of the erector device 3 in parallel to the longitudinal direction of the shield tunneling machine 1. Subsequently, the traveling carrier 52 with the distance measuring device 51 mounted thereon is attached to the rail 50. This distance measuring device 5
1 is a distance measuring device mainly used for tunnels, which applies the principle of a light wave distance measuring device. Thereby, even if the rotating ring 4 rotates 360 degrees, no positional deviation occurs, and measurement can be performed in a constant state.

As shown in FIG. 2(b), the traveling carrier 52 is provided with a motor 53, and further, the distance measuring device 51 is movable by a combination of a rack and a pinion 52, and can be kept in a fixed position. Can be stopped. The distance traveled at this time is measured by a stroke meter 55, which may be a wire type, a tachometer, or the like.

Next, a basic equation, which is an example of an arithmetic equation, for calculating the tail clearance using a computer will be shown. That is, as is clear from FIG. 3(a), the tail clearance t is calculated as follows: t=l-l1 -W・cos{tan-1((l2
−l1 )/m)}.

[0016] Here, l is the distance to the skin plate measured with the distance measuring device 51, l1 is the distance to the tip A point of the segment, l2 is the distance to any arbitrary point B of the segment, and m is any arbitrary distance. The horizontal distance between point B and point A, W is the thickness of the segment, and θ in the figure is the inclination angle of the segment.

FIG. 3(b) shows the light wave (or electromagnetic wave, etc.) R emitted by the distance measuring device 51 to the object to be measured. ing.

FIG. 4 shows a state in which accurate segment positions are calculated from the combination of the tail clearance measuring device 9 and the transit 70. That is, by measuring the distance from the transit 70 to the distance measuring device 51 and finding the angle θ formed by the central axis of the shield tube 2 and the light ray R connecting the transit 70 and the distance measuring device 51, the position of the segment can be determined. It can be calculated accurately.

According to this embodiment, for example, in the ECL method, the position of the lining concrete can be accurately determined by measuring the inner formwork for lining the lining concrete with the tail clearance measuring device 9 (not shown). can be grasped.

(Second Embodiment) FIG. 5 shows a second embodiment of the present invention, in which a rotating ring 15 is attached to a screw conveyor 14 and a tail clearance measuring device 9 is attached. .

FIG. 6 shows details of the portion where the distance measuring device travels. In the figure, the support ring 60 is attached to the screw conveyor 14, and its direction is approximately perpendicular to the shield tunneling machine 1 as shown in FIG. 5(a). Further, the rotating ring 61 is supported by the support ring 60 via rollers 62. The rotating ring 61 can be rotated 360 degrees by the drive motor 63, and can also be rotated by a combination of gears and pinions and stopped at a predetermined location.

[0022]

[Effects of the Invention] As explained above, the present invention provides a shield excavator for constructing underground tunnels, in which a distance measuring device for measuring the relative position of a segment and a shield tube is movably disposed in a segment assembly device. This eliminates the work previously performed by humans, which eliminates the need for scaffolding and walkways, which saves labor and enables highly accurate and rapid measurements.

[0023] Furthermore, the swivel ring equipped with a distance measuring device is
Since it is installed around the outer periphery of the mud feeding/discharging pipe or the scaffolding for segment assembly, it is possible to measure the entire circumference without any obstacles between the segment and the measuring device.

[Brief explanation of the drawing]

FIGS. 1(a) and 1(b) are a longitudinal cross-sectional view of a shield tunneling machine according to a first embodiment of the present invention and a view thereof in the direction of arrow A. FIG.

FIG. 2(a) is a diagram showing details of a portion where the distance measuring device travels, and FIG. 2(b) is a side view of the main part thereof.

FIG. 3(a) is a diagram showing the positional relationship between the tail clearance measuring device, the segment and the shield cylinder, and FIG. 3(b) is a diagram showing the measurement state thereof.

FIG. 4 is a plan view showing a measurement state of segment positions.

FIGS. 5(a) and 5(b) are a longitudinal cross-sectional view of a shield tunneling machine according to a second embodiment of the present invention and a view taken along arrow B thereof.

FIG. 6 is a diagram showing details of a portion where the distance measuring device travels.

[Explanation of symbols]

1...Shield excavator 2...Shield tube 3... Erecta device 4,15・Swivel ring 9...Tail clearance measuring device 10...Segment 14...Screw conveyor 51... Distance measuring device 55... Stroke meter 60...Support ring 61...Rotating ring

Claims (1)

[Claims] 1. A shield excavator for constructing underground tunnels, characterized in that a distance measuring device for measuring the relative position of a segment and a shield tube is movably arranged in a segment assembly device. Machine.