JPS6123353B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a folding shield tunneling machine, and particularly to a shield tunneling machine that is capable of bending at a large angle.

When excavating tunnels for railways, subways, water and sewage systems, power communication cables, etc. using the shield method, not only straight construction but also curved construction is often required. Conventionally, as shown in the plan view of Figure 1A, in order to make the shield machine a move in a curved direction, excavation was made wider than the outer shell of the shield machine, and space b had to be over-excavated to allow the shield machine to make a curved advance. has been done.
However, excessive digging tends to loosen the ground and often causes collapse. Therefore, an important issue in the shield method is to minimize this excess digging.

Conventionally, there are split-barrel folding type shield tunneling machines as shown in Figure 1 B or C, but the bending angle of these is limited by the distance c between both shells, and the mounting position of the jack d or bolt e is limited. Due to constraints, there are limits to their allowable deflection angles. In addition, a void f is created in the outer shell on one side during the curve, and there is a risk of the ground collapsing. In addition, due to the structure, the bending angle is at most 2.5°C and the gap f is about 10cm, which is insufficient for curved construction with a small radius of curvature, so there is a drawback that the amount of excess excavation must be increased.

SUMMARY OF THE INVENTION An object of the present invention is to provide a shield excavator that has a large advance angle and avoids partial collapse of the ground by reducing the amount of overexcavation.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained in detail below with reference to embodiments shown in the accompanying drawings.

FIG. 2 shows an overall side view of an embodiment of a hand-mining shield excavator with a two-piece body folding type constructed according to the present invention, and FIG. 3 shows a cross-sectional plan view of one side of the shield in a folded state. The outer shell of this shield tunneling machine is divided into two in the longitudinal direction, that is, a front divided trunk 1 and a rear divided trunk 2, and both divided trunks 1 and 2 have an axis perpendicular to the center in the left-right direction of the tunneling machine. They are connected by a rotating connection pin 3. Therefore, when only the outer shell is viewed in plan, during straight construction, there are V-shaped gaps 4 on both sides of the rotary connecting pin 3, as shown in FIG.
4 exists, and at the time of maximum corner bending construction, a gap 4a is created which is closed on one side and twice as wide on the other side as shown in FIG. 4B.

The front divided trunk 1 consists of a front part 1a and a rear part 1b,
The rear portion 1b is formed with a slightly smaller diameter by providing a step.
Similarly, the rear divided trunk 2 consists of a front part 2a and a rear part 2b. A flexible cover 5 is provided on these small diameter portions 1b, 2a so as to cover the gaps 4, 4a.

This cover 5 is attached to the outer surface of the rear part 1b of the front split trunk 1 by arranging strip-shaped plates 5a of an elastic material such as spring plates adjacent to each other as shown in FIG.
The plate 5a is not fixed to the outer surface of the front part 2a of the rear divided trunk 2, but is always attached to the rear divided trunk so as to follow the angle change by bending the two divided trunks 1 and 2 and close the gaps 4 and 4a. It contacts the trunk 2a.

The cover 5 is installed using the difference in level between the split shells 1 and 2 so as not to protrude beyond the front part 1a of the front split shell 1, that is, the outer surface of the outer shell. It won't happen.

FIG. 6 shows a modified embodiment of the cover 5, in which rectangular spring plate unit plates 5a are arranged in a staggered manner to improve the sealing performance of the gaps 4, 4a. The cover 5 can also be made of a highly elastic material such as rubber and have a cylindrical shape. Furthermore, these configurations may be combined. In either form, the cover 5 may be given an appropriate shape in advance so as to cover the gap that appears between the cover 5 and the position-dividing trunk front portion 2a depending on the angle at the time of turning.

Referring again to FIGS. 3 and 4, a digging jack 6 for digging the shield machine is provided, its rod-side front end 6a is connected to the front split shell 1 with a pin 7, and its cylinder-side rear end 6b It is also connected to a press ring 8, which is a press ring, by a pin 7a. The press ring 8 is fitted into the inner surface of the outer shell of the rear divided trunk 2 and is slidable in the axial direction of the rear trunk 2. The press ring 8 comes into contact with the end of the segment S assembled in the rear shell 2 by the erector device 9, and the front split shell 1 moves forward as the digging jack 6 expands. Of course, since the rear divided trunk 2 is towed via the rotational connection pin 3, it follows the front trunk 1 and advances.

Erector device 9 used for assembling segment S
is installed in the rear divided cylinder 2, and even when both the divided cylinders are bent, the center of the erector device 9 is always at the center of the rear divided cylinder 2, making the assembly arrangement of the segments advantageous even during curved construction. do.

As shown in FIG. 2, the front split shell 1 of the shield machine is appropriately equipped with a retaining jack 10, 11 to enable forward buckling regardless of the bending of the split shell. In addition, in order to improve the bending performance of the shield machine, as shown in FIG.
2. It is convenient to provide a removable sled 13 as an outside guide.

In order to make the bending of the shell easier and more advantageous during bending construction, a pair of bending jacks 14 may be provided on both sides of the shield machine for the purpose of applying a forced bending force. As shown in FIGS. 2 and 7, the bending jack 14 has its rod side front end 14a connected to the front divided cylinder 1 by a pin 15, and its cylinder side rear end 14b connected to the rear divided cylinder 2 by a pin 15a. Rotatably connected. These bending jacks 1
4 are operated in conjunction with each other by a hydraulic circuit, which will be described later, to perform the bending operation of both bodies, and by stopping the operation of the bending jack 14, a desired bending angle can be maintained. When maintaining the bent position for a long time, instead of the bending jack 14, use a connecting rod 16 as shown in FIG.
The front and rear divided trunks 1 and 2 may be rotatably connected at 5 and 15a.

Figures 9, 10 and 11 show the propulsion jack portion of an embodiment different from the previous embodiment. In this embodiment, a shoe 17 used in a normal shield machine is used instead of a press ring for each propulsion jack 6.
It is set up for each. The propulsion jack 6 is at the front end 6
a is connected by a pin 7, and the rear portion of the propelling jack 6 on the cylinder side is supported by a guide member 18, and changes as the body bends within a horizontally long through hole 19 that also serves as a guide for the sliding movement of the guide member 18. Note that the guide member 18 is elastically supported against displacement in the bending direction by a spring 0 or fluid pressure means.

Figures 12 and 13 show further different embodiments. The propulsion jack 6 is constructed integrally with the guide portion 18a together with a sleeve 21 and an elastic member 22 such as rubber, so that it can be slightly elastically displaced. These displacements become the margin for construction of the segment S.

FIG. 14 shows a three-body split type embodiment. It is made up of two rotary connection pins 3a and 3b and is designed to increase the bending angle. In this example, the propulsion jack 6 extends between the rear divided cylinder 2 and the middle divided cylinder 23, and the bending jack 14 is connected to the front. It is arranged over the position dividing cylinder 1 and the middle position dividing cylinder 23.

By changing the connecting position of the leading trunk and the rear trunk, it is possible to perform not only horizontal curved excavation but also curved excavation in other directions.

Next, a description will be given of the bending jack drive circuit and its operation based on the above configuration.

FIG. 15 shows an example of a hydraulic circuit for the bending jack 14. The hydraulic oil is sent from the hydraulic source 24 via the 3-position switching valve 25 to the bending jack 14l on the left side in the direction of movement of the shield machine, and on the other hand via the 3-position switching valve 25 and 3-position switching valve 26 to the right bending jack 14l. It is sent to the bending jack 14r. 2
7 is a check valve, 28 is a relief valve, 29 is an oil reservoir, and 30 is a return oil pipe.

When the 3-position switching valve 26 is positive, the 3-position switching valve 2
5 is set positive, the left jack 14l extends and the right jack 14r contracts, as shown by the solid line arrow in FIG. The right jack 14l contracts and the right jack 14r extends, generating bending forces in the respective directions. If the three-position switching valves 25 and 26 are set to the neutral position during operation, the bent state is maintained. In this hydraulic circuit, after the bending is completed,
When the 3-position switching valve 25 is switched in the opposite state when the 3-position switching valve 26 is in the reverse state, as shown in FIG.
Both the left and right jacks 14l and 14r are reduced, and as a result, a force is generated to pull the rear divided trunk 2 in the direction of the front divided trunk 1, so that the burden of traction by the rotary connection pin 3 can be reduced.

As described above, according to the present invention, the following effects can be obtained.

(1) While the bending angle of a conventional folding type shield tunneling machine is about 2.5 degrees at most, the bending angle of the shield tunneling machine of the present invention can be increased to about 10 degrees.

(2) Since the body can be bent to fit a predetermined curve, extra digging can be minimized. Therefore, it is possible to prevent the ground from collapsing, and also to prevent the ground from collapsing and subsidence in the gap between the ground and the segment, that is, the so-called tail poid.

(3) The required amount of backfilling material to be filled into the tailpoid can be reduced.

(4) The accuracy of curve construction is improved, and it is possible to prevent the shield machine from sinking, especially in the case of mechanical excavation, since it is no longer necessary to perform over-digging all around the circumference.

(5) In general, in shield construction, the bending direction is limited to left and right, and construction of sharp curves in the vertical direction is rare. Therefore, if the structure is such that bending is possible only in the left and right directions, it is possible to prevent vertical meandering since almost no vertical bending occurs.

[Brief explanation of the drawing]

FIG. 1A is a cross-sectional plan view showing a conventional shield tunneling machine in a curved construction state, and FIGS.
FIG. 2 is an overall vertical sectional side view of one embodiment of the present invention;
Figure 3 is a cross-sectional side plan view of the folded state, Figure 4
Figures A and B are schematic plan views showing the state of a shield tunneling machine according to an embodiment of the present invention when it is moving straight and when it is bent; Figure 5 is a perspective view of an example of a flexible cover;
The figure is a perspective view of another example of the cover, Figure 7 is a vertical side view of the bending jack part, Figure 8 is a vertical side view of the connecting rod, and Figures 9, 10 and 11 are of the propulsion jack part. 12 and 13 are longitudinal sectional side views and partial front views of still another embodiment of the propulsion jack portion, and FIG. 14 is a three-part folding type. A schematic cross-sectional view of an embodiment of the present invention, FIG. 15 shows the hydraulic circuit of the bending jack, and FIG. 16 shows the state in which it is switched to the traction state. 1... Front split trunk, 2... Rear split trunk, 3, 3
a, 3b...Rotary connection pin, 4, 4a...Gap,
5...Cover, 6...Propulsion jack, 7,7a...
...Pin, 8...Press ring, 9...Erector device, 14...Bending jack, 15, 15a...
...Pin, 16...Connecting rod, 23...Medium split barrel,
S...Segment, a...Shield excavator, b...
...Extra gap, c...Gap, d...Jack, e...
...Bolt, f... air gap.

Claims (1)

[Scope of Claims] 1. The outer shell of the shield tunneling machine body is divided in the longitudinal direction, and each divided body is bendably connected by a pair of coaxial rotary connecting pins, and the propulsion jack moves the front part forward. It is rotatably supported on the torso, and the rear part is elastically supported by the rear torso so that it can be displaced according to the bending of the divided torso.
A flexible cover is provided around the joint outer shell to cover the gap created at the bending part, and bending jacks are provided on the front and rear shells to assist in bending the split shell and maintain the bent state. A shield excavator characterized in that a hydraulic circuit for towing the rear trunk is provided in the bending hydraulic circuit of the bending jack, which is provided on both sides of the bending jack. 2. The connecting pin is located at the center of the body in the left-right direction,
The shield tunneling machine according to claim 1, characterized in that its axis is vertical. 3. Providing a step on the outer shell of the connecting part of each of the divided cylinders,
The shield excavator according to any one of claims 1 and 2, wherein the flexible cover is stretched within the step. 4. Claims 1 to 3, characterized in that a forward propulsion jack is rotatably supported on the press ring in the rear split shell and the front split shell.
The shield tunneling machine described in any of the paragraphs.