JPH01310091A - Shield excavator - Google Patents

Abstract

PURPOSE:To perform excavation without entailing any unexcavated remnants behind by attaching an excavating plate to plural numbers of eccentrically rotating shafts, and constituting this excavating plate to be free of movement on a surface in parallel with an excavating surface. CONSTITUTION:Plural numbers of revolving shafts 3 driving an excavating plate 2 are attached to a direction orthogonal with an excavating surface of this excavating plate 2. In addition, the driving side of these revolving shafts 3 is attached to an eccentric position of a rotating shaft 31. With this constitution, the excavating plate 2 repeats its continued up, down and traverse movements by means of each rotation of two revolving shafts 3.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a shield excavator that can be used when excavating a tunnel with a cross section other than a circular cross section.

<Conventional technology> Shield excavation involves placing a large number of jacks inside a cylindrical shield body, assembling segments at the rear, and using the expansion and contraction of the jacks to create a reaction force on the segments to dig a tunnel underground. Machines are widely used.

<Problems with conventional technology> A rotary disk is located in front of such a conventional shield excavator, and excavation is performed by this rotary disk.

However, since excavation is performed by rotation, the cross-sectional shape of the excavation is limited to a circular shape.

If an attempt is made to excavate a cross section other than a circle, a plurality of rotary cutters will be used in combination, but it will not be possible to excavate areas where the rotation trajectories do not overlap.

Nowadays, there is a trend for tunnels to have larger cross sections, and as a result, demand for tunnels with non-circular cross sections is increasing.

This is because even if a tunnel with a circular cross section is excavated, only the central belt-shaped part can be used, and the unusable area is thicker vertically. This is because it becomes uneconomical.

<Object of the present invention> The present invention was made to solve the above-mentioned problems, and provides a shield excavator that can excavate a non-circular tunnel cross section without leaving any excavation residue. The purpose is to

<Configuration of the present invention> Next, embodiments of the present invention will be described.

<A> Overall structure (Fig. 1) The overall structure of the shield tunneling machine is the same as that of conventional equipment.

However, the shape of the cylindrical main body 1 is a shape other than a circle, that is, a non-circular shape such as an ellipse or a rectangle.

A large number of jacks are arranged inside the cylindrical main body 1, and various driving devices, rotating devices, and auxiliary devices are installed inside.

Note that related devices are not shown because they are similar to conventional structures.

<mouth> drilling machine An excavator 2 is placed in front of the shield excavator main body 1.

This excavator 2 does not have a structure that covers the entire front surface of the main body, but has an area smaller than the cross-sectional area of the main body 1.

Therefore, a space will be created around the excavation disk 2.

However, when excavation is stopped for a long time, the collapse of earth and sand from the space is blocked by the shielding plate 5 which is moved in and out by the jack 51 as shown in FIG. 5, so there is no problem.

By the way, this excavation board 2 is a single plate-shaped body, and differs from the structure of conventional equipment in which a plurality of cutters are combined.

One excavator 2 is connected to a driving part on the main body 1 side via a plurality of revolution shafts 3.

<C> The plurality of revolving shafts 3 that drive the revolving shaft excavator 2 are
It is installed in the direction perpendicular to the excavation surface.

The drive side of the revolution shaft 3 is attached to an eccentric position of the rotating shaft 31.

There is an eccentric distance P between the center of the rotation axis 31 and the center of the revolution axis 3.

Each rotation shaft 31 is connected to a drive source and rotates in the same direction at the same rotation speed.

As a result, the rotation of the rotation axis 31 causes the revolution axis 3 to revolve, and the rotation of the revolution axis 3 causes the excavation disk 2 to move on the plane.

<2> Wooden circular cross section (FIG. 2) A case will be described in which the main body 1 has an elliptical cross section. In this case, the excavating disk 2 is connected by two revolution shafts 3.

Due to the rotation of the two revolution shafts 3, the excavator 2 repeatedly ascends, descends, and moves laterally.

Therefore, by appropriately selecting the distance fiP from the center of the rotation axis 31 to the center of the revolution axis 3 and the shape of the excavation disk 2, it is possible to make the excavation disk 2 move to completely cover the cross section of the main body 1. can.

<E> Semicircular cross section (Fig. 3) This is the structure of a shield tunneling machine in which the floor of a tunnel with a circular cross section is formed by an arc with a large radius.

In this case, the excavator 2 is connected to a drive source by three revolution shafts 3.

In this case as well, by appropriately selecting the eccentric distance P from the center of the rotation axis 31 to the center of the revolution axis 3 and the shape of the excavation plate 2, the excavation plate 2 is caused to move to completely cover the cross section of the main body 1. be able to.

<<>> Rectangular cross section (FIG. 4) When the cross section of the shield tunneling machine main body 1 is a rectangular cross section, for example, a configuration in which the excavating disk 2 is connected to a drive source by four revolution shafts 3 can be adopted.

(G5) When excavating tunnels with other cross-sections or other shapes, the rotation axis 31 is also used.
Eccentric distance P from the center to the center of the revolution axis 3 and the excavation plate 2
By appropriately selecting the shape of the excavator 2, it is possible to make the excavator 2 move so as to completely cover the cross section of the main body 1.

Effects of the Present Invention Since the present invention employs the above-described structure, the following effects can be expected.

<B> Tunnels with cross sections other than circular can be excavated.

In this case, instead of having a structure in which multiple discs are rotated, the entire front excavation disc moves within the entire cross section, so there is no leftover part of the excavation.

<Mouth> A large number of drilling blades (bits) attached to the front of the drilling machine all move the same distance.

Therefore, uniform digging resistance acts on all bits,
Abrasion of the bit is not concentrated, and the entire bit is worn uniformly, allowing a long service life to be maintained.

<C> Behind the excavator is a stirrer that takes in and stirs the earth and sand, similar to conventional equipment.

Since this stirrer also performs a similar movement, it is possible to prevent co-rotation with earth and sand inside the chamber.

(2) Conventional excavators are supported and driven only by a rotating shaft at the center of the circle.

However, in the device of the present invention, the excavation disk is supported and driven by multiple rotating shafts, so even if eccentric force is applied due to the resistance of earth and sand during excavation, the shape of the excavation disk can be stably supported and the rotation transmitted. This can prevent failures from occurring.

By attaching multiple excavators so that they do not interfere with each other and giving them rotation, it is also possible to excavate sections with extremely large diameters.

[Brief explanation of the drawing]

Fig. 1 A sectional view of the device of the present invention Fig. 2 An explanatory drawing seen from the front Fig. 3.4 An explanatory drawing of another embodiment seen from the front Fig. 5
Cross-sectional view of the device of other embodiments Fig. 1 Fig. 3

Claims (1)

[Claims] (1) A shield excavator with an excavator positioned in front of the shield body, characterized in that the excavator is attached to a plurality of eccentrically rotating shafts, and the excavator is movable on a plane parallel to the excavation surface. A shield tunneling machine