JPH03257282A - Upward shield excavating method and upward shield excavator - Google Patents

Abstract

PURPOSE:To excavate effectively by assembling segments circularly below excavating cylinder propulsion jacks, and bringing the lowest segments into contact with existing shield jacks so as to push the height up by one segment. CONSTITUTION:A shield excavator 1 is composed of a cutter 3, an excavating cylinder 4, a motor 6, excavating cylinder propulsion jacks 7, a sludge pipe, and the like. Segments 9 are assembled circularly below the excavating cylinder propulsion jacks 7, and the lowest ends of the assembled segments 9 are brought into contact with the upper ends of existing shield jacks 10 disposed in a circle. At the time of assembling the segments 9, a part of jacks 10 is pulled in, and thereon the segment 9 is fitted in and fastened to the other segment 9. This operation is repeated to assemble the segments 9 for one ring, and the jacks 10 are elongated. Upward excavating efficiency is thereby improved.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an upward shield excavation method for excavating ground from a horizontally excavated tunnel upwards in order to provide ventilation holes in mountain tunnels, etc. It concerns shield tunneling machines.

[Prior Art] When excavating the ground upward from a horizontally excavated tunnel in order to provide ventilation holes in mountain tunnels, etc., conventionally, piles were driven from the ground surface to reach the horizontal tunnel. A cutter for excavation was attached to the bottom end of the pile, and while the pile was being pulled up, the cutter was used to excavate the ground upwards.

[Problem to be solved by the invention] When excavating the ground upward using an excavation cutter attached to the lower end of the pile, it will not collapse in the case of hard geology, but in the case of soft geology. There is a danger of it collapsing.

Therefore, a shield excavator suitable for excavating soft geology may be used to excavate the ground by pointing upwards, but when assembling segments, it is not possible to use the same means for assembling horizontal segments as is.

An object of the present invention is to provide an upward shield excavation method and an upward shield excavation machine equipped with segment assembly means suitable for upward excavation with a shield excavation machine.

[Means for Solving the Problems] The present invention assembles a segment at the lower part of the excavation tube propulsion jack of a shield excavator that excavates upward, and uses the shield jack to move the lower part of the assembled segment into segment 1.
After assembling the segments for one ring by repeating the operation of pushing up the shield jack by the height of one ring, then retracting a part of the shield jack and assembling the next segment at the bottom of the assembled segment, the shield An upward shield excavation method characterized by pushing up a segment assembled by extending a jack by the height of one segment, and an excavation in which the excavation tube of a shield excavation machine that excavates upward is pushed upward. It is characterized by comprising a cylinder propulsion jack, and a plurality of shield jacks that are arranged in a circle on the ground below the tunnel propulsion jack and push up the segments assembled at the lower part of the tunnel cylinder propulsion jack. It is an upward shield tunneling machine.

[Operation] It is possible to perform excavation while assembling the segments, and the segments can be assembled from the outside.

[Example] Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a longitudinal cross-sectional view of an embodiment of the present invention, showing a state in which an upward shield excavator i is excavating the ground from the middle of a horizontal tunnel 2 upwards. The upward shield tunneling machine l is equipped with a cutter 3, a tunneling tube 4, a bulkhead 5, a cutter rotation motor 6, a tunneling tube propulsion jack 7, a mud removal pipe 8, etc., and a segment 9 is provided below the tunneling tube propulsion jack 7. The lowermost segment 9 is assembled in a circular manner one after another, and the upper ends of a plurality of shield jacks 10 arranged in a circular manner come into contact with the lower surface of the lowermost segment 9. The plurality of shield jacks 10 are arranged in a circular manner on the ground 11 in the horizontal tunnel 2 below the tunnel propulsion jack 7 to push up the segment 9.

When assembling the segment 9, as shown in Fig. 3, part of the shield jack IO is retracted, and the segment 9 is fitted onto the retracted shield jack 10 from the outside of the segment 9. Fasten one segment 9 to another segment 9. Since this fastening work can be performed from the outside of the segment 9 within the horizontal tunnel 2, the bolt holes t2 of the segment 9 are provided on the outside of the segment 9, as shown in FIG.

The segments 9 for one ring can be assembled by sequentially inserting and fastening the segments 9 while sequentially retracting the shield jack 10. This segment 9
Even during the assembly operation, the upward excavation operation of the upward shield excavator 1 can be performed continuously by rotating the cutter 3 shown in FIG. 1 and extending the excavation tube propulsion jack 7.

When the assembly of one ring of segment 9 is completed on the retracted shield jack IO, all the shield jack IOs are simultaneously extended by the height of one ring of segment 9, and the excavation pipe is extended by the same dimension. By retracting the propulsion jack 7, all assembled segments 9 are
It can be pushed upwards by the amount of the ring. Next, while sequentially retracting the shield jack IO, assemble the next segment 9 below the already assembled segment 9, and repeat the process of extending the shield jack 10, thereby assembling the segments 9 from the lower end and moving upward one by one. It can be pushed up and penetrated to the ground surface.

The interior of the tunneling tube 4 and the segment 9 assembled into a cylindrical shape are used for the riding of a person who controls the upward shield tunneling machine 1.
Ring-shaped work stages 13 shown in FIGS. 1 and 2 are provided at appropriate heights inside, and segments 9 equipped with ladders 14 on the inner surface are arranged in a vertical row for climbing up and down to the work stages 13. Installed side by side, ladder 14 and work stage 13
A cutout hole 15 is provided in the work stage 13 so that it can be easily transferred between the work stage 13 and the work stage 13.

[Effects of the Invention] According to the present invention, the segments can be easily fastened from the outside of the segments assembled into a cylindrical shape, and excavation can be performed even during the segment assembly work, so there is no fear of the ground collapsing and the work is efficient. It has the effect of allowing upward shield digging.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view of one embodiment of the present invention, FIG. 2 is a cross-sectional view taken along the line -■ in FIG. 1, and FIG. 3 is a vertical cross-sectional view showing a state in which segments are fitted. In the figure, 1 is an upward shield excavator, 4 is an excavation tube, 7 is an excavation tube propulsion jack, 9 is a segment, 10 is a shield jack, and 11 is the ground.

Claims (1)

[Claims] 1) Assemble a segment to the lower part of the excavation tube propulsion jack of a shield excavator that excavates upward, and push the lower part of the assembled segment up by the height of one segment with the shield jack, Next, the operation of retracting a part of the shield jack and assembling the next segment below the assembled segment is repeated to assemble one ring of segments, and then the shield jack is extended and the assembled segment is assembled into segments. An upward shield excavation method characterized by pushing up by the height of one piece. 2) An excavation tube propulsion jack that pushes upward the excavation tube of the shield excavation machine that excavates upward, and an excavation tube propulsion jack that is arranged in a circular manner on the ground below the excavation tube propulsion jack and that is located below the excavation tube propulsion jack. An upward shield excavator characterized by being equipped with a plurality of shield jacks that push up assembled segments.