JPH0967997A - Brocken-type open shield machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To smoothly carry out excavating work without reducing the freedom of the front body and the rear body in a brocken-type open shield machine, and by regulating unnecessary movement in the up and down direction of both the bodied. SOLUTION: In a brocken-type open shield machine consisting of a front body 1 and a rear body 2 connected by a steering jack, an engaging pin 4 is provided in the horizontal direction on the upper part of either one side of the body 1 or the rear body 2; on the other hand, a long hole 5 for penetrating the engaging pin 4 is provided on the other side of the front body 1 or the rear body 2. The long hole 5 is formed in such a way that its longitudinal direction is horizontal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shield machine used in a shield construction method, and in particular, excavation at a shallow surface
The present invention relates to a structure of a center-folding open shield machine in which the top part is a center-folding open type and can carry out earth and sand and lay a box from this top part.

[0002]

2. Description of the Related Art In recent years, a shield construction method has been widely used for tunnel construction. In this method, a shield machine having a frame with a cross section slightly larger than the outer diameter of the tunnel is pushed into the ground, the face part is excavated at the tip, and then the rear end is assembled into a ring shape called a segment. It is a construction method in which the tunnel structure is inserted to support the inner surface of the tunnel, and by repeating this, the tunnel is dug and advanced.

[0003] An open shield method is a method in which this shield method is performed near the surface of the ground, and the tunnel is opened while the upper part of the tunnel is open, that is, a trench is dug. The open shield machine used in this construction method has an open upper part, and it is possible to carry out earth and sand from this part and lay a box body corresponding to a segment. Further, the excavation at the face part can be performed by a shovel car on the ground.

The shield machine is equipped with a shield jack for obtaining a reaction force from the frame (segment) and advancing the shield machine in the ground. That is, it has a mechanism in which a box body already laid is pressed by a shield jack, and the reaction thereof causes the entire frame body to move forward.

Further, such a shield machine is divided into a front vehicle body 20 and a rear vehicle body 21 as shown in FIG. 4, for example, and the front vehicle body 20 and the rear vehicle body 21 are separated into right and left portions. The steering jacks 22 and 22 connected to each other are provided.

By adjusting the extension amounts of the steering jacks 22 and 22, the forward direction of the shield machine can be changed.

[0007]

However, in the above-described conventional shield machine, the front vehicle body 20 and the rear vehicle body 21 are simply connected by the steering jacks 22 and 22, so that the front vehicle body 20 is not connected. And the rear body 21 move separately,
A vertical discrepancy may occur between the two. Therefore, especially when the soil at the construction site is gravel, the unevenness at the misaligned portion poses a problem, and smooth construction is difficult.

If the two are connected by a shaft, there will be no discrepancy in the vertical direction, but delicate steering becomes difficult, which is not desirable. The present invention has been made in view of the above matters, and a front vehicle body and a rear vehicle body in a middle folding shield machine,
It is a technical issue to provide a center-folding open shield machine that is capable of smoothly performing excavation work by restricting unnecessary movements of the two in the vertical direction without compromising freedom.

[0009]

In order to solve the above-mentioned technical problems, the present invention provides a center folding open shield machine in which a front vehicle body 1 and a rear vehicle body 2 are connected by a steering jack 3. It was configured like this.

That is, the engaging pin 4 is horizontally provided on the upper side of one side of the connection surface of the front vehicle body 1 and the rear vehicle body 2, while the engaging pin 4 is provided on the other side of the front vehicle body 1 and the rear vehicle body 2. The technical means is to provide a long hole 5 through which the engaging pin 4 is inserted, and the long hole 5 is formed so that its longitudinal direction is horizontal. [Front Vehicle Body 1] The front vehicle body 1 can be formed in a tubular shape as a whole, and an earth retaining jack can be attached to the tip thereof. [Rear Vehicle Body 2] The rear vehicle body 2 can be formed into a tubular shape as a whole, and a mechanism for accommodating a segment or box culvert, which is a structure in close contact with the tunnel side wall, can be provided at the rear end thereof. [Steering jack 3] A hydraulic jack is suitable for connecting the front vehicle body 1 and the rear vehicle body 2. As for the number of attachments, one is required at least in the left and right positions, but it is preferable to attach about three each on the left and right. [Engagement Pin 4] The engagement pin 4 is provided at a connecting portion between the front vehicle body 1 and the rear vehicle body 2, and is provided on one side of the front vehicle body 1 or the rear vehicle body 2. Its position is at the top of the car body,
It is not desirable to expose it to the outside, and it is better to install it by retracting it inside the vehicle body. It can be attached by welding or bolt nuts. [Elongated hole 5] This is provided so that its longitudinal direction is horizontal, and its width in the lateral direction is set to a dimension such that the engaging pin 4 can be inserted inside and slid to the left and right.

The present invention comprises the above-mentioned essential components, but an auxiliary machine usually attached to a center-folding open shield machine, for example, a shield jack is added to advance the center-folding open shield machine in the ground. Even if you do. Further, the engagement pin 4 and the elongated hole 5 may be provided not only as one set but also as two or more sets.

In the above structure, the movement of the connecting portion between the front vehicle body 1 and the rear vehicle body 2 freely moves in the horizontal direction on the horizontal plane, but the front vehicle body 1 and the rear vehicle body 2 move vertically in the horizontal plane. There is no discrepancy and movement.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. A indicates the whole of the center-folding open shield machine, which is formed in a tubular shape as a whole. The front vehicle body 1 and the rear vehicle body 2 are connected by a steering jack 3. An earth retaining jack 6 is provided on the front surface of the front vehicle body 1, and an earth retaining plate 7 is provided at the tip of the earth retaining jack 6. A shield jack 9 is provided in the rear vehicle body 2.

The earth retaining jacks 6 are provided in the left and right positions of the vehicle body, four in total and eight in total. The rear body 2
An engaging pin 4 is welded to the upper part of the front surface of the. As shown in FIG. 2, the engagement pin 4 is provided inside the outer wall of the vehicle body and has a diameter of 80 millimeters.

On the other hand, an elongated hole 5 through which the engaging pin 4 is inserted is provided on the upper rear surface of the front vehicle body 1. This elongated hole 5 is formed in H steel fixed to the front vehicle body 1 side. The long hole 5 is provided so that its longitudinal direction is horizontal,
The width in the lateral direction is set to a dimension such that the engaging pin 4 can be inserted inside and slid to the left and right.

In the above embodiment, the elongated hole 5 is provided on the front vehicle body 1 side and the engagement pin 4 is provided on the rear vehicle body 2 side. Conversely, the elongated hole 5 is provided on the rear vehicle body 2 side. Hole 5
The engagement pin 4 may be provided on the front vehicle body 1 side.

With such a structure, the front vehicle body 1 and the rear vehicle body 2 are locked by the engaging pins 4 and the elongated holes 5, so that the front vehicle body 1 and the rear vehicle body 2 cannot move in the direction of arrow F in FIG. There is no step in the vertical direction. On the other hand, since the engaging pin 4 can move horizontally in the elongated hole 5, it can move to some extent in the G direction indicated by the arrow. Therefore, there is no hindrance to the lateral bending by the steering jack 3.

The center folding open shield machine A having the above-mentioned construction is used as shown in FIG. The center-bending open shield machine A advances with the top surface thereof buried in a depth such that the top surface is approximately at the same level as the ground surface. When advancing, first, the front of the center folding open shield machine A is excavated by the backhoe 10 to remove soil, and the box body (box culvert) 12 is inserted at the rear end of the rear vehicle body 2. The crane 11 is used for this insertion. Then, the box 12 is pressed by the shield jack 9, and the reaction causes the box-type open shield machine A to move forward.

By repeating this operation, a tunnel (groove) is formed.
To build in the ground. At this time, the steering jack 3 is actuated as necessary to perform the steering, but since the front vehicle body 1 and the rear vehicle body 2 are regulatedly connected as described above, for example, the ground is unstable. Even in soil, the front vehicle body 1 and the rear vehicle body 2 do not sink separately, and the vehicle can proceed stably and smoothly.

[0020]

As described above, according to the present invention, in the front and rear vehicle bodies of the center folding type shield machine, unnecessary movements of both of them in the vertical direction can be restricted, so that steering in the horizontal direction on the horizontal plane can be controlled. The excavation work can be carried out smoothly without any trouble. In particular, the front vehicle body and the rear vehicle body do not sink separately even on unstable ground such as gravel.

[Brief description of drawings]

FIG. 1 is a sectional view of an entire apparatus showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view of essential parts of a connecting portion between a front vehicle body and a rear vehicle body showing an embodiment of the present invention.

FIG. 3 is a side view of a state of use of the present apparatus showing the embodiment of the present invention.

FIG. 4 is a cross-sectional view showing a conventional center-folding open shield machine.

[Explanation of symbols]

 1 ... front vehicle body, 2 ... rear vehicle body, 3 ... steering jack, 4 ... engagement pin, 5 ... elongated hole.

Claims (1)

[Claims] 1. A center-folding open shield machine in which a front vehicle body 1 and a rear vehicle body 2 are connected by a steering jack 3, wherein an upper portion on one side of a connecting surface of the front vehicle body 1 and the rear vehicle body 2 is provided. , The engaging pin 4 is provided in the horizontal direction, and an elongated hole 5 through which the engaging pin 4 is inserted is provided on the other side of the front vehicle body 1 and the rear vehicle body 2. A center-folding open shield machine characterized by being formed horizontally.