JPH02144497A - Messel shield machine - Google Patents

Abstract

PURPOSE:To prevent fallen earth from falling down to an outbreak space of the side of a frame by arranging belt-shaped plate members on both sides of the upper part of a frame, and providing a jack driving the plate members between a projected position and a withdrawn position in which the tips of the plate members are buried into a void between MESSELS and a bearing member to bear the plate members in the projected position. CONSTITUTION:Side faces 5 such as belt shaped plate members are provided to both sides of the upper part of a frame 1, and they are supported outward by two jacks 6 to be laid between the ends of the frame 1. After that, the side faces 5 are projected to the outside from the void of adjacent MESSELS 2 by expansion drive of the jack 6, and the tips are withdrawn up to the withdrawn position where they sink into the voids of the MESSELS 2. Or, when an outbreak is carried out in a poor subsoil having a fear of breakdown, the side faces 5 of both ends of the upper part of the frame 1 are projected to the outside from the voids of MESSELS 2 respectively by the expansion of the jack 6. According to the constitution, the fallen earth can be prevented from falling down to the outbreak of a space of the side of the frame 1.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an improvement of a Metsu cell shield excavator used for T91 machine excavation of tunnels.

(Prior Art) A self-propelled Metsu cell shield excavator as shown in FIGS. 5 and 6 is known as a machine for excavating mountain tunnels.

This is a boom cutter 1 installed through bases 12 and 13 inside a 7 frame 1 formed to have a similar shape to the tunnel excavation cross section.
This excavator is equipped with a Metsu cell 2 that is driven in the front-rear direction on the outer periphery of a frame 1, and a boom cutter 10 excavates the face, and an arm differential car 11 collects the excavated pickpocket. It is supposed to be done. In addition, the collected pieces are conveyed to the rear mine entrance by a belt conveyor 14.

The Metsu cell 2 consists of a front part 2A that holds the outside of the 7-frame 1 and the front part of the frame 1, and a tail part 2B that connects the rear part of the frame 1. By expanding and contracting a hydraulic metsu-sel jack 4 interposed therebetween, they are guided by a metsu-sel guide 3 fixed to the frame 1 and move integrally in the front-rear force direction.

A large number of such metsu cells 2 are arranged in parallel around the outer circumference of the frame 1 so as to cover the entire circumference, and according to the progress of excavation by the boom cutter 10, the metsu cells 2 are sequentially attached to the face by being driven to extend. It penetrates and protects the excavated surface in front of the frame 1.

Also, when all Metsu Cell 2 have advanced forward,
By contracting the entire Messel Noyak N4, the 7 rem 1 is advanced by the Noyanki stroke.The reaction force against this is supported by the frictional resistance between the Messel Noyach 2 and the surrounding ground. In this way, the excavation work is carried out by repeatedly expanding and contracting the metsel jack 4. Note that 7 is a face jack that supports the front surface of the face.

(Problem to be solved by the invention) By the way, when excavating the curved M section of a tunnel, in order to change the progress direction of shield excavation to a gradual one, it is necessary to make the excavation cross section slightly thicker than the external shape of the shield excavator. ,
Sometimes we do extra hori. Further, even in the case of a straight section, similar over-excavation may be performed after fine adjustment of the excavation direction. However, in such a case, if the other mountains are not strong, the Kokimata collapse will occur as shown in Figure 7, and the extra moat space 15 on the side of the mountain 1 will be buried in the collapsed earth and sand. Sometimes.

The earth and sand filling the extra trench space 15 exerts a force in the direction of the arrow on the Metzel 2, making it difficult for the shield excavator to change direction. Furthermore, if the tunnel continues to be excavated with this earth and sand left unattended in a straight section, the shield tunneling machine will gradually move upwards, which may impede directional control.

The present invention aims to solve the above-mentioned problems when over-drilling is performed using a Metsusel Shield excavator, by preventing collapsed earth and sand from falling into the over-drilling space on the 7th side of the tunnel.
The purpose of the present invention is to provide a Metsu cell shield excavator with the following functions.

(Means for Achieving the Object) The present invention has many advantages! In a metsu cell shield excavator equipped with a plurality of metsu cells to be subjected to JJ in parallel on the outer periphery of the frame, band-shaped plates protruding from the gaps between the metsu cells toward the surrounding ground are placed on both sides of the upper part of the frame, It includes a jack that drives the plate between a protruding position and a retracted position where the tip of the plate is buried in the gap between the cells, and a support member that supports the plate in the protruding position.

(Function) When over-drilling is carried out under conditions where the collapse of the ground is likely to occur,
If strip-shaped plates are made to protrude through the gaps between the mensel and towards the surrounding ground through the gloss, the collapsed earth and sand from above the excavation area will be prevented from falling into the over-excavation space on the side of the frame by these plates. , deposited on the metucell. Further, the support member prevents the board from falling down due to the weight of the earth and sand piled up on the mesh cell. Therefore, the trench space below the board is maintained without being filled with earth and sand.

On the other hand, in cases where over-excavation is not required or under conditions where collapse occurs, the planks are held in the retreated position through the gloss so that they do not act as resistance to the excavation work ().

(Example) Examples of the present invention are shown in Figures tj4i to 4.

In FIG. 1, reference numeral 1 designates a frame of a Jl shield excavator assembled in an external shape that matches the cross-section of a tunnel excavated, and a boom cutter and arm decker similar to those of the conventional example are installed inside.

7. On the outer periphery of the frame 1, a large number of metsu cell ids 3 as shown in FIG. It engages freely by sliding in the front-rear direction. Further, a metzel jack for driving these metzels 2 back and forth is interposed between the metzels 2 and the 7-frame 1.

On both sides of the upper part of the frame 1, side faces 5, which are strip-shaped plates having shapes as shown in FIGS. 1 and 2, are provided at the positions shown in FIG. 4. This side 7 ace 5 is made of a steel plate with a thickness of about 30 mm, for example, and is supported outwardly by two jacks 6 interposed between both ends and the frame 1. Then, by the expansion drive of the jack 6, it protrudes outward from the gap between the adjacent mensels 2, and by the contraction drive of the gloss 6, it retreats to a retracted position where the tip sinks into the gap between the mensels 2.

In the middle part of the side face 5 located inside the gloss 6, there is a base 5A extending inward of the 7 frames 1.
It is formed at m locations. This base portion 5A is formed in such a length that it still overlaps with the frame 1 even when the side face 5 is in the protruding position, and supports this base i5A from both sides and counteracts the load applied to the side face 5 in the direction of falling.
As shown in FIG. 3, anti-falling voids 8 are fixed at positions corresponding to the base portions 5A of the seven frames 1.

Next, the effect will be explained.

In excavation work that does not require aftershock, or in excavation work that involves aftershock in geological conditions such as rock that does not easily collapse, the side face 5 is held in the retreated position by the contraction of the jar 7 and 6. In the retracted position, the tip of the side face 5 is buried in the gap between the metusels 2, so it does not provide any resistance when the 7-frame 1 is advanced, and the excavation work is carried out in exactly the same manner as in the prior art.

On the other hand, when performing aftershocks on soft soil that is at risk of collapse,
Noyah! By expanding f6, the sides 7A and 5 on both sides of the upper part of the frame 1 protrude outward from the gap in the metsu cell 2 (in this state, for example, the
As shown in the figure, even if the ground above 7th frame 1 collapses, the collapsed earth and sand will be removed by side 7 ace 5 on both sides.
It is prevented from falling into the aftershock space 15 on the side of the frame 1, and is deposited on the Metsu cell 2 held between the side faces 5.

Therefore, the landslide of fallen earth and sand does not act on the Metsu cell 2 at the lower part, and the shield excavator can change direction and finely adjust the direction while effectively utilizing the aftershock space 15. In addition, although a load in the direction of falling is applied to the side 7 ace 5 due to the earth and sand accumulated on the top of the upper metsu cell 2, the falling prevention fixed to the 7 frame 1 causes the side 7 ace 5 to resist this load and move the base 5A. Since it is supported from both sides, there is no fear that side 7 ace 5 will fall or become deformed.

(Effects of the Invention) As described above, the present invention provides a plate material that protrudes outward from the gap between the Metsu cells at the top of the frame of a Metsu cell shield tunneling machine, a jack that drives this plate material, and a jack that causes the plate material to fall. Because it is equipped with a support member that supports the plate in the direction, it does not create resistance to the excavation work by holding the plate in the retreated position during normal excavation, and when performing over-drilling under conditions that are likely to collapse. By causing the plate material to protrude outward by driving the jack, it is possible to prevent fallen earth and sand from filling the aftershock space on the side of the frame.

Therefore, the aftershock space can be effectively maintained even under conditions such as soft soil, and it is possible to smoothly change the direction of the excavator and change the course (g4x) that require the aftershock space.

[Brief explanation of the drawing]

Figures 1 to 4 show an embodiment of the present invention. Figure 1 is a vertical cross-sectional view of the main part of the Metsu cell shield excavator, Figure 2 is a cross-sectional view of the main part, and Figure 3 is a →l ID. FIG. 4 is a cross-sectional view of the main part of the 7-ray frame showing the support h1 of the 7-ace, and FIG. 4 is a schematic cross-sectional view of the tunnel to explain the operation. In addition, Figures 1 to 4 show a conventional example12, and Figure 5 shows a longitudinal section of a Metsu cell shield excavator.1. FIG. 6 is a cross-sectional view of the main part, and FIG. 7 is a schematic cross-sectional view of the tunnel to explain the accumulation of fallen soil. 1... Frame, 2... Metsel, 5... Side 7 Ace, 5A... Base, 6... Jacket, 8...
・It is easy to prevent falling. Patent Applicant: Nippon Koiso Co., Ltd. Second Flash Figures 6 and 4

Claims (1)

[Claims] In a Messel Shield excavator, which is equipped with multiple Messels that are driven back and forth in parallel on the outer periphery of the frame, band-shaped plates that protrude from the gaps between the Messels toward the surrounding ground are placed on both sides of the upper part of the frame. A Messel shield excavator comprising: a jack that drives a plate between a protruding position and a retracted position where the tip of the plate is buried in a gap between the Messels; and a support member that supports the plate at the protruding position.