JPS6149100A - Oval shield drilling machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial Application Minute Hand The present invention relates to an elliptical shield excavator suitable for use when excavating a tunnel or the like having an elliptical cross section by the shield method.

(b), Prior Art Conventionally, most tunnels excavated by shield excavators have a circular cross section, and therefore the cross section is an ellipse (here, "ellipse" is a mathematical term). It does not mean a strict ellipse, but rather an ``elongated circle'' that is not a ``perfect circle'' such as an ``ellipse'' or an ``oddly shaped ellipse''.Of course,
It also includes a strict "ellipse" in the mathematical sense. ) There are no shield excavators capable of excavating tunnels, and most of them have a circular cutter attached to a cylindrical shield shell facing in the direction of excavation propulsion.

(C)0 Problems to be Solved by the Invention However, recently there has been a strong demand for tunnels with an elliptical cross section, and there is a desire for the development of a shield excavator that can excavate such elliptical tunnels using the shield method.

SUMMARY OF THE INVENTION In view of the above-mentioned circumstances, an object of the present invention is to provide an elliptical shield excavator that can easily excavate tunnels having an elliptical cross section by a shield construction method.

(d) Means for solving the zero problem, that is, the present invention has an outer shell having an elliptical cross section when viewed from the front in the excavation propulsion direction, and one or more circular cutters are provided in the outer shell. is provided so as to be rotatably driven in the direction of excavation propulsion, and a fixed excavation means which itself does not move mechanically during excavation is provided between the cutter and the outer shell.

(e) Operation With the configuration described above, the present invention operates in such a way that it is possible to excavate the soil along an oval shell by means of a rotating cutter and stationary excavation means.

(f), Example Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a front view showing an embodiment of an elliptical shield excavator according to the present invention, FIG. 2 is a sectional view taken along line II-[ in FIG. 1, and FIG. 3 is a sectional view taken along line 1-111 in FIG. 4 is a front view showing another embodiment of the present invention, FIG. 5 is a sectional view taken along the line ■-■ in FIG. 4, and FIG. 6 is a front view showing still another embodiment of the present invention. , FIG. 7 is a front view showing still another embodiment of the invention, FIG. 8 is a front view showing still another embodiment of the invention, and FIG. 9 is a front view showing still another embodiment of the invention. It is a diagram.

As shown in FIGS. 1 to 3, the elliptical shield excavator 1 has an outer shell 2 that is entirely shaped like an elliptical cylinder.
On the front side of the outer shell 2 in the excavation propulsion direction, that is, on the left side in FIGS. 2 and 3, a circular cutter 3 having a plurality of excavation blades 3b provided on an excavation surface 3a is rotatably provided. There is. As shown in FIGS. 2 and 3, between the cutter 3 and the outer periphery of the elliptical outer shell 2, a fixed blade 5 is arranged in an inclined manner from the outer periphery tip 2a to the outer periphery of the cutter 3. As shown in FIG.
A large number of ultra-high pressure water injection nozzles 6 are provided over the entire surface. Among the nozzles 6, the nozzle 6 provided closest to the outer shell 2 is equipped with a spray direction variable device 6, as shown in FIG.
A is provided, and a jet direction variable device 6a can change the jet direction of ultra-high pressure water from the nozzle 6.

Further, on the right side of the cutter 3 in FIGS. 2 and 3, a plurality of hydraulic jacks 7 are disposed in an annular shape so that the cutter 3 can protrude and retreat in the direction of the arrow A1B. A plurality of propulsion hydraulic jacks 9 are provided inside the central portion of the outer shell 2 along the elliptical cross section of the outer shell 2 . A segment 10 in an assembled state is installed on the right side of the ram 9a of the hydraulic jack 9, and an elliptical state of the assembled segment 10 is located near the rear end of the outer shell 2 of the assembled segment 10. An elliptical holding device 11 is provided for correct holding and shaping. Further, number 12 is an erector for assembling the segment 10.

Since the elliptical shield excavator 1 has the above configuration, the elliptical shield excavator 1 excavates a tunnel 1 having an elliptical cross section.
3, as shown in Figure 2, point the excavation surface 3a of the cutter 3 in the excavation direction of
Rotate. As the cutter 3 rotates, ultrahigh pressure water is ejected from the nozzle 6 of the fixed blade 5 toward the face 13a, and the soil around the cutter 3 is excavated in an elliptical shape along the shape of the outer shell 2. As the soil around the cutter 3 is excavated using ultra-high pressure water, the hydraulic jack 9 is driven to remove the ram 9a.
Using the assembled segments 10 as scaffolding, the outer shell 2 is gradually moved in the direction of arrow A, which is the excavation driving direction. Then, the soil that has been excavated and softened by the ultra-high pressure water is scraped in an elliptical shape around the soil by the fixed blade 5 that is propelled in the A direction. Therefore, the hydraulic jack 7
is driven to project the cutter 3 in the direction A in a rotating state, and the cutter 3 excavates the soil in the central part of the unexcavated state in a circular shape. In this way, the cutter 3 excavates the soil in the center in a circular shape, and the fixed blade 5 excavates the soil around the cutter 3 with ultra-high pressure water from the nozzle 6 in a shape that matches the outer shape of the outer shell 2, so that the tunnel 13 is The cross section is excavated in an elliptical shape. As shown in Part B, if the excavation continues while the outer shell 2 is advanced in the direction A using ultra-high pressure water from the cutter 3, fixed blade 5, and nozzle 6, a tunnel 13 with an oval cross section will be formed. be done.

In addition, as in this embodiment, if a jet direction variable device 6a is provided in part or all of the nozzle 6 provided on the fixed blade 5 to change the jet direction of ultra-high pressure water, the ultra-high pressure water can be Excavation such as overcutting becomes possible by ejecting in the direction of the arrow in FIG. 2, that is, outwardly from the outer shell 2.

Although the above-mentioned embodiment describes the case where there is only one cutter 3, it goes without saying that the number of cutters 3 is not limited to one, but may be used in any number of combinations, such as two or more. As shown in Figure 5, one large-diameter cutter 3A is installed in the center.
In addition, it is also possible to provide two small-diameter cutters 3 on both sides, and to provide fixed blades 5 at four locations between the cutters 3.3 and the outer shell 2.

In addition, in FIG. 6, four cutters 3 are provided, and the cutters 3
An example is shown in which four fixed blades 5 are arranged between the outer shell 20 and the outer shell 20.

Note that, as is clear from the examples in FIGS. 4 and 5, the fixed blade 5 does not necessarily have to be provided around the entire circumference of the cutter 3, and the outer circumference of the cutter 3 coincides with the outer circumference of the outer shell 2. Of course, in such a case, there is no need to provide the fixed blade 5 in that part. Therefore, the fixed blades 5 are also provided at one or more locations depending on the arrangement of the cutter 3. FIG. 7 shows a combination of two large-diameter cutters 3A and two small-diameter cutters 38, FIG. 8 shows a combination of two cutters 3, and FIG. What is shown is a case where two cutters 3 partially overlap. In both cases, the fixed blade 5 is provided with a nozzle 6 for jetting ultra-high pressure water.

(g) 0 Effects of the Invention As explained above, according to the present invention, the outer shell 2 has an elliptical cross section when viewed from the front in the excavation propulsion direction, and the outer shell 2 has one or more A circular cutter 3! ! A fixed blade 5, an ultra-high-pressure water injection nozzle 6, etc. are provided between the cutter 3 and the outer periphery of the outer shell 2 so as to be rotatable in the cutting direction. Since the structure is provided with a fixed excavation means that does not move with the propulsion of the shield, the tunnel 13 having an oval cross section can be easily excavated by the shield method using the cutter 3 and the fixed excavation means. , it becomes possible to provide an elliptical shield excavator 1 that can meet the recent demands for excavating tunnels 13 with an elliptical cross section.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an embodiment of an elliptical shield excavator according to the present invention, FIG. 2 is a cross-sectional view taken along line II-I in FIG. 1, and FIG. 3 is a cross-sectional view taken along line I-N in FIG. 4 is a front view showing another embodiment of the present invention, and FIG. 5 is a front view showing another embodiment of the present invention.
6 is a front view showing still another embodiment of the present invention, FIG. 7 is a front view showing still another embodiment of the present invention, and FIG. 8 is a front view showing still another embodiment of the present invention. A front view showing an example;
FIG. 9 is a front view showing still another embodiment of the present invention. 1. Elliptical shield excavator 2...Outer shell 3...Cutter 5...Fixed excavation means (fixed blade) 6...Fixed excavation means (nozzle) Applicant
Mitsui Construction Co., Ltd. Agent Patent Attorney Phase 1) Pressure work Fig. 8 Fig. 9

Claims (1)

[Scope of Claims] An outer shell having an elliptical cross section when viewed from the front in the excavation propulsion direction, and one or more circular cutters are provided on the outer shell so as to be rotatably driven in the excavation propulsion direction. Also, an elliptical shield excavator comprising a fixed excavating means that does not move mechanically during excavation between the cutter and the outer shell.