JP2634653B2 - Messel shield excavator - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an improvement in a Messel shield excavator used for mechanical excavation of a tunnel.

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

The boom cutter 10 and the arm decker 11 are attached to the inside of the frame 1 formed in a shape similar to the excavation section of the tunnel through the bases 12 and 13 and the messel 2 driven in the front-rear direction on the outer periphery of the frame 1. The boom cutter 10 excavates the face, and the arm decker 11 collects the excavated shears. Further, the collected waste is transported by a belt conveyor 14 to a rear wellhead.

The messel 2 is composed of a front portion 2A that performs ridges outside the frame 1 and in front of the frame 1, and a tail portion 2B that performs ridges behind the frame 1 in succession. Interposed hydraulic messel jack 4
Messel guide 3 fixed to frame 1 by expansion and contraction
And move integrally in the front-back direction.

A large number of such messels 2 are arranged in parallel on the outer circumference of the frame 1 so as to cover the entire circumference, and the messel jacks 4 are extended and driven in accordance with the progress of excavation by the boom cutter 10 to sequentially penetrate the face. , The excavation surface in front of the frame 1 is protected.

Further, when all the messels 2 have advanced forward, the entire messel jacks 4 are contracted to advance the frame 1 by the jack stroke. The reaction force against this is supported by the frictional resistance between the messel 2 and the surrounding ground. In this way, the excavation work is performed while repeatedly expanding and contracting the messel jack 4. Reference numeral 7 denotes a face jack for supporting the front face of the face.

(Problems of the Invention) By the way, when excavating a curved part of a tunnel, extra excavation is performed so that the excavation cross section is slightly larger than the outer shape of the shield excavator in order to gradually change the traveling direction of the shield excavator. Sometimes. In addition, even in the case of a straight portion, similar excavation may be performed for fine adjustment in the excavation direction. However, in such a case, if the ground is not solid, a small-scale collapse may occur as shown in FIG. 7, and the extra space 15 on the side of the frame 1 may be buried in the collapsed earth and sand.

The earth and sand that has filled the extra excavation space 15 exerts a force in the direction of the arrow on the messel 2, making it difficult for the shield excavator to turn. Also, if the excavation is continued while leaving the earth and sand in the straight section, the shield excavator gradually turns upward, and there is a possibility that the direction control may be hindered.

The present invention provides a Messel shield having a function of preventing collapsed earth and sand from dropping into an extra excavation space on the side of a frame in order to solve the above-described problems in the case of performing excavation in a Messel shield excavator. The purpose is to provide an excavator.

(Means for Achieving the Object) The present invention provides a messel shield excavator having a plurality of messels driven back and forth in parallel on the outer periphery of a frame, and protrudes from gaps between the mesels to surrounding ground. A strip-shaped plate member is disposed on both sides of the upper portion of the frame, a jack that drives the plate member between a protruding position and a retracted position where the tip of the plate member is buried in a gap between the mesels, and a support member that supports the plate member at the protruding position. It has.

(Function) When excavation is performed under conditions where the ground is likely to collapse, a strip-shaped plate can be projected from the gap in the messel to the surrounding ground through a jack, and the excavated part will be The landslides are prevented from falling into the extra space on the side of the frame by these plates, and accumulate on the messel. Also,
The support member prevents the plate from falling down due to the weight of the sediment deposited on the messel. Therefore, the surplus space below the plate is maintained without being buried in the earth and sand.

On the other hand, when the excavation is unnecessary or under the condition where the collapse is unlikely to occur, the plate material does not become a resistance to the excavation work by holding the plate material at the retracted position via the jack.

(Embodiment) FIGS. 1 to 4 show an embodiment of the present invention.

In FIG. 1, reference numeral 1 denotes a frame of a shield excavator assembled to have an outer shape similar to a cross section of a tunnel excavation, and a boom cutter and an arm decker similar to the conventional example are installed inside the shield excavator.

A number of messel guides 3 as shown in FIG. 2 are fixedly arranged side by side on the outer periphery of the frame 1, and a messel 2 comprising a front portion 2A and a tail portion 2B having a blade-like tip slides in each messel guide 3 in the front-rear direction. Freely engage. A messel jack for driving the messel 2 back and forth is interposed between the messel 2 and the frame 1.

On both sides of the upper part of the frame 1, the first
As shown in FIG. 2 and FIG. 2, a side face 5 which is a band-shaped plate material having a shape is provided. The side face 5 is made of, for example, a steel plate having a thickness of about 30 mm.
Are supported outward by two jacks 6 interposed between the two jacks. Then, the jack 6 is extended outward from the gap between the adjacent messels 2 by the extension driving of the jack 6, and is retracted by the contraction driving of the jack 6 to a retracted position in which the tip is submerged in the gap of the messel 2.

A base 5A extending toward the inside of the frame 1 is provided at an intermediate portion of the side face 5 located inside the jack 6.
Formed at the location. The base 5A is formed to have a length that overlaps the frame 1 even when the side face 5 is in the protruding position, and supports the base 5A from both sides to counter the load in the falling direction applied to the side face 5. Third
The fall prevention guide 8 shown in the figure is the base 5A of the frame 1.
Are fixedly provided at the positions corresponding to the above.

 Next, the operation will be described.

In excavation work that does not require extra excavation or excavation work with extra excavation in geological conditions such as rock that is hard to collapse,
The side face 5 is held at the retracted position by the contraction of the jack 6. At the retracted position, the tip of the side face 5 is buried in the gap between the messels 2, so that there is no resistance when the frame 1 is advanced, and the excavation work is performed in exactly the same manner as in the conventional example.

On the other hand, when excavation is performed on soft soil that may collapse, the side faces 5 on both upper sides of the frame 1 are projected outward from the gaps of the messel 2 by extending the jack 6. In this state, even if the ground above the frame 1 collapses during the excavation work, as shown in FIG. 4, for example, the collapsed earth and sand is removed by the side faces 5 on both sides and the extra space 15 on the side of the frame 1. And is deposited on the messel 2 sandwiched between the side faces 5.
For this reason, the earth pressure of the collapsed sand does not act on the lower messel 2, and the shield machine can perform the direction change and the fine adjustment of the direction while effectively using the extra excavation space 15.
A load in the falling direction acts on the side face 5 due to the earth and sand deposited on the upper messel 2, but the fall prevention guide 8 fixed to the frame 1 supports the base 5A from both sides against this load. As a result, there is no possibility that the side face 5 will fall or be deformed.

(Effects of the Invention) As described above, the present invention supports a plate material projecting outward from a gap between mesels at the upper portion of a frame of a messel shield excavator, a jack for driving the plate material, and supporting the plate material in a falling direction. With the support member, during normal excavation, holding the plate in the retracted position does not cause resistance to excavation work, and when excavating under conditions that are easily collapsed, drive the jack By protruding the plate material to the outside, it is possible to prevent the collapsed earth and sand from filling the extra space on the side of the frame.

For this reason, the excavation space can be effectively maintained even under conditions such as soft soil, and the direction change and fine adjustment of the course of the excavator that requires the extra excavation space can be smoothly performed.

[Brief description of the drawings]

1 to 4 show an embodiment of the present invention. FIG. 1 is a longitudinal sectional view of a main part of a Messel shield excavator, FIG. 2 is a transverse sectional view of the same main part, and FIG. FIG. 4 is a schematic cross-sectional view of a tunnel for explaining the operation, and FIG. 5 to 7 show a conventional example, FIG. 5 is a longitudinal sectional view of a Messel shield machine, FIG. 6 is a transverse sectional view of the same main part, and FIG. FIG. 1 is a schematic cross-sectional view of a tunnel. 1 ... frame, 2 ... messel, 5 ... side face, 5A ... base, 6 ... jack, 8 ... fall-stop guide.

Claims (1)

(57) [Claims] 1. A messel shield excavator having a plurality of messels driven back and forth in parallel on the outer periphery of a frame, wherein strip-shaped plate members projecting from gaps between the mesels to surrounding ground are provided on both sides of an upper portion of the frame. And a jack that drives the plate between a projecting position and a retracted position in which the tip of the plate is buried in the gap between the mesels, and a support member that supports the plate at the projecting position. Messel shield excavator.