SU97630A1 - Tunneling shield - Google Patents

Description

In order to provide the possibility of mechanized trapezoidal section workings at the underground (tunnel, trench and elevated) trench and ditch construction, in insufficiently stable soils it is proposed to arrange bucket cutters with a multi-cutter bucket working opgan of swinging action to position the bucket cutters in a step-wise manner, by the height of development, by the height of the mine, them at each step in length in accordance with the change in the width of the slab.

FIG. 1 shows a side view of a multi-cutter bucket tool; in fig. 2, 3 and 4-consecutive positions of the working body when it is fed to the magnitude of the working stroke; in fig. 5-8 are some techniques for using a multi-cutter bucket tool.

The incisors 1, 2, 3, 4 of the multi-cutter bucket tool have different lengths according to the change in width. For underground workings, the cutters should be consistently lengthened from top to bottom, and when making trenches or ditches from bottom to top.

The work of the working body bucket consists in cutting or cleaving the ground with the cutters /, 2, 3, 4, for which the working bucket is communicated to the bucket, i.e., clockwise rotation relative to axis 5. At idle (reverse rotation of the bucket counterclockwise) solid soil bottoming remains “steps that allow the driving shield 6 to move forward by chip thickness (i.e., to the height of the step at the level of axis 5) close to the face, which is prevented from collapsing by the bucket 7 plating.

FIG. 1 shows the position of the bucket body when the working and idling have already been completed, but the feed forward has not yet been made. This position corresponds to FIG. 2, which shows a part of the bucket tool (front view from the side of the slab) and the side inclined wall (cutting edge) 8 of the keystone SHIELD is visible. The thickness e of the cutting edge is assigned in accordance with the number of incisors and the stroke of the bucket, so that after the bucket of the working stroke (Fig. 3 and 4) is completed, the cutters overlap the edge 8, but do not extend beyond

the limits of the contour limited by it (beyond the boundaries of the bottom). The lateral development of the overhanging protrusions of a triangular shape (fig. 3) is cut off by the edge 8 when the shield is moved. The dimensions of the protrusions depend on the magnitude of the stroke of the tool, i.e., on the distance between the incisors /, 2, 3, 4 ..., and can be reduced by additional intermediate cutting tools 9 (Fig. 4). Instead of the incisors 9, incisors 10 parallel to the walls of the excavation can be attached.

FIG. 5 is a diagram of the development of a single multi-tool coaxial 10-bar tool; in fig. 6-scheme with the use of sin multiscale bucket working bodies, which allow to balance the reactive moments arising during the development of the slab. The middle bucket makes its working move from top to bottom, while the side buckets must cut the bottom-up from the bottom up, as they delineate the production not only at the bottom but also on the sides.

FIG. 7 shows a diagram of a shield with two horizontal buckets. In this scheme can be applied

and a greater number of buckets, which allows the face to be shaped closer to the vertical plane. The same scheme can be adapted to counter-cutting rock with buckets in order to keep the jet moments moving.

FIG. Figure 8 shows the direction of the bucket stroke when excavating the trench x. It is clear that in the development of trenches, the previous schemes can also be applied.

Subject invention

Claims (2)

1. A passage shield with a multi-cutter bucket working tool of swinging action, characterized in that, in order to develop mine workings, trapets, and sections, double cutters are arranged stepwise in height, and are made at each step in length in accordance with the change of the slab width. 2. In the shield according to claim 1, use additional cutters to contour the walls of the workings to the steps of the main cutters.