JPH1096234A - Open shield machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely bend a machine body without strain only by adding simple constitution such as round steels to a shield machine and to prevent the incursion of earth, sand, etc., in order that the machine body is divided into a plurality of parts in the horizontal direction and that the front end of the rear machine body is fitted to the rear end of the front machine body to enable both machine bodies to bend at their fitting sections. SOLUTION: In an open shield machine 1, a machine body constituted of both right and left side walls 1a and 1b and the bottom plate 1c is divided into a front machine 2 and a tail machine 3 in the horizontal direction, the front end of the tail machine 3 is fitted to the rear end of the front machine 2 to enable both both machines to bend at their fitting sections. Then, a vertical round steel 16a and a horizontal round steel 16b are arranged to the front end circumference of the tail machine 3 in the direction of the width, and it is connected to the rear end inside circumference of the front machine 2 through the round steels.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an open shield machine used for an open shield method.

[0002]

2. Description of the Related Art As is well known, the open shield method is
This is a highly rational construction method that takes advantage of the open-cutting method (open method) and the shield method.

[0003] In this open shield method, the front end of the rear fuselage is fitted into the rear end of the forward fuselage, and the shield can be bent at the mutual fitting portion to enable curve construction and direction correction. There are things that can be done.

[0004] To explain an example, one open shield basically includes left and right side wall plates 1 as shown in FIG.
This is a shield machine having front, rear, and upper surfaces, each of which is made up of side plates 1a and 1b and a bottom plate 1c having the same length as the side wall plates 1a and 1b and connecting them.

As shown in FIG. 8, the open shield machine 1 divides the body into a plurality of parts in the front-rear direction, and the front end of the rear body as the tail machine 3 is fitted into the rear end of the front body as the front machine 2. Therefore, it is possible to bend at the mutual fitting portion.

The front machine 2 is mainly used for excavation. The front end and the upper surface are open surfaces, and the center folding jack 4 is arranged rearward and rearward in the body of the machine, and is arranged in a plurality of vertical stages. ing. On the other hand, the tail machine 3 is for installing the concrete box 8, and the shield jacks 5 are arranged in a plurality of stages up and down, with the shield jacks 5 left and right facing forward and rearward in the body. In the figure, reference numeral 6 denotes a movable split cutting edge provided at the front end of the front machine 2, reference numeral 7 denotes an earth retaining plate provided at the rear end of the tail machine 3, reference numeral 9 denotes struts, and reference numeral 10 denotes a press bar (push angle).

[0007] An open shield method using such an open shield machine 1 is as shown in Figs.
It is constructed between the starting pit and the reaching pit. The open shield machine is assembled in the starting pit 11, the ground in front of the starting pit 11 is excavated by a shovel type excavator 12 installed on the ground, and the shield jack 5 of the shield machine 1 is extended and The shield machine 1 is advanced by applying a reaction force to the reaction wall of the shield machine, the first concrete box 8 forming the underground structure is suspended from above, and the shield is reduced in the tail machine 3 of the shield machine 1 Behind jack 5, strut 9 and press bar 10
Set with. The starting pit 11 is composed of a retaining wall such as a sheet pile. In order to start the open shield machine 1, the retaining wall is partially mirror-cut. In some cases, the ground has been improved.

Next, similarly, the excavator 12 excavates earth and sand from the front or upper surface of the front machine 2 and discharges the earth to move the shield machine 1 forward. Is suspended in the tail machine 3. Thereafter, the same excavation and the setting process of the concrete box 8 are repeated, and the concrete boxes 8 are sequentially buried in the ground in tandem, and backfilled with the dump 14 on the rear concrete box 8, and the open shield machine is opened. When 1 reaches the pit 13, it is disassembled and removed to complete the construction. In the figure
15 is a grouting machine.

The excavation of the shield machine 1 not only extends the shield jack 5 but also extends the shield jack 5.
Is fixed and the front machine 2 is advanced with respect to the tail machine 3 by the extension of the center folding jack 4, and the shield machine 5 and the center folding jack 4 are pushed in two stages.

At this time, if one of the left and right middle folding jacks 4 is extended more, the front machine 2 turns to the opposite side and turns in that direction. Further, if any of the upper and lower sides is extended more, the front machine 2 changes its direction to the opposite side and bends upward or downward. Such curve construction or direction correction is possible.

[0011]

However, in the above-mentioned conventional shield machine, the front end of the tail machine is fitted to the rear end of the front machine with a gap, that is, loosely fitted. However, there is a risk that the airframes may damage each other, or that earth and sand may enter through gaps, thereby eliminating a space for bending.

[0012] An object of the present invention is to solve the above-mentioned disadvantages of the prior art, to divide the body into a plurality of parts in the front-rear direction, and to insert the front end of the rear body into the rear end of the front body and to form a mutual fitting portion. An object of the present invention is to provide an open shield machine which can bend easily and surely by simply adding a simple structure to the shield machine so as to be bendable, and which can prevent intrusion of earth and sand.

[0013]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention firstly divides a body consisting of left and right side walls and a bottom plate into a plurality of parts in a front-rear direction, and attaches a rear body to a rear end of a front body. In the open shield machine in which the front end of the body is fitted and can be bent at the mutual fitting part, a round steel is arranged in the width direction around the front end of the rear body, and the front body is rearwardly inserted through the round steel. Secondly, the round bar is rigidly attached to the front end of the left and right side wall plate or the front end of the bottom plate plate of the rear body, and thirdly, the front body and the rear Each of the fitting portions of the fuselage has a rectangular body by laying a beam plate between the left and right side wall plates, and the round steel is formed so that the left and right side wall plate front end, the bottom plate front end and the beam plate of the rear body surround these from outside. It is intended to be mounted in a rigidly connected state.

According to the first aspect of the present invention, in the front body and the rear body which are combined front and rear, the round steel provided in the width direction on the outer periphery of the front end of the rear body is joined to the front body. Since it bends as a fulcrum, it can bend smoothly. In addition, the space between the front body and the rear body is narrowed by the round bar and the gap is reduced, so that intrusion of earth and sand can be prevented.

According to the second aspect of the present invention, in addition to the above-described operation, the round bar is attached to the front ends of the left and right side walls of the rear body in a rigidly connected state, and is effective in bending right and left. .

According to the third aspect of the present invention, there is further provided:
The round bar is also provided at the front end of the bottom plate, and is also effective when bent back and forth.

According to the fourth aspect of the present invention, the front body and the rear body are fitted with each other in a state where the rectangular bodies are restrained on all sides, and the round steel on the outer periphery of the rear body is formed in the front body. Since it is joined to the inner periphery of the airframe, the mutual airframe does not shift, and reliable bending can be obtained in any of the left, right, front and rear directions.

[0018]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a vertical sectional front view showing a first embodiment of the open shield machine of the present invention, and FIG. 2 is a vertical sectional side view of the same.

The open shield machine of the present invention is also divided into a plurality of bodies in the front-rear direction similarly to the conventional example shown in FIG.
The front end of the rear body as the tail machine 3 is fitted into the rear end of the front body as the front machine 2 so as to be able to bend at the mutual fitting portions.

Among them, the front machine 2 has a movable split blade 6
The front end and the upper surface having an opening are open surfaces, and the center-fold jacks 4 are arranged in a left and right direction and a plurality of stages up and down toward the rear in the body. On the other hand, the tail machine 3 is provided with shield jacks 5 arranged left and right toward the front and rearward in the body, and in a plurality of vertical stages, and a retaining plate 7 at the rear end.

The front end of the tail machine 3 is reduced in diameter at the front end thereof.
A gap is secured between the front machine 2 and the tail machine 3, but the left and right side wall plates 1 a, 1 b of the tail machine 3 are vertically oriented in the width direction. A round steel 16a was provided, and a horizontal round steel 16a was provided on the bottom plate 1c in the width direction. As shown in FIGS. 5 and 6, the vertical round bar 16a and the horizontal round bar 16b are welded to the side wall plates 1a, 1b and the bottom plate 1c, or are rigidly connected to the side plates 1a, 1b and the bottom plate 1c by means of a bolt 18 or the like.

The vertical round bar 16a and the horizontal round bar 16b may be located at the same position as each other and arranged in a U-shape as a whole. However, the present invention is not limited to this. The end may be shifted in the direction.

In this way, the front machine 2 and the tail machine 3 bend at the fulcrum where the vertical round bar 16a and the horizontal round bar 16b are joined, so that they can be bent right and left or back and forth. Can bend smoothly even in the case.

Further, the vertical round steel 16a and the horizontal round steel 16a
The gap between the front machine 2 and the tail machine 3 is narrowed by the amount of b, so that intrusion of earth and sand can be prevented.

FIGS. 3 and 4 show a second embodiment of the present invention. Each of the front machine 2 and the tail machine 3 has a rectangular body with a beam plate 17 provided between the left and right side walls 1a and 1b. The tail machine 3 also rigidly connects the horizontal round steel 16b to the outside of the beam plate 17 in the width direction, and surrounds the front end of the tail machine 3 from the outside with the vertical round steel 16a and the horizontal round steel 16b. I did it.

According to the second embodiment, the front machine 2 and the tail machine 3 combine the vertical round steel 16a and the horizontal round steel 16b with the rectangular bodies mutually restrained on all sides. The front machine 2 does not float with respect to the tail machine 3 even when bending in the vertical direction.
Reliable bending is obtained.

In the above-described embodiment, the open shield machine 1 has two bodies, such as a front machine 2 and a tail machine 3.
Although the case of division has been described, the present invention can be applied to a case where a middle machine is added between the front machine 2 and the tail machine 3 to divide the machine into three or more.

[0028]

As described above, in the open shield machine of the present invention, the fuselage is divided into a plurality in the front-rear direction, and the front end of the rear fuselage is fitted into the rear end of the forward fuselage, and the mutual fitting portion is formed. However, by simply adding a simple configuration of round steel to the shield machine, it is possible to bend the machine body without difficulty and prevent intrusion of earth and sand.

[Brief description of the drawings]

FIG. 1 is a vertical sectional front view showing a first embodiment of an open shield machine of the present invention.

FIG. 2 is a vertical sectional side view showing a first embodiment of the open shield machine of the present invention.

FIG. 3 is a vertical sectional front view showing a second embodiment of the open shield machine of the present invention.

FIG. 4 is a vertical sectional side view showing a second embodiment of the open shield machine of the present invention.

FIG. 5 is a side view of an essential part showing an example of rigid connection of a round bar.

FIG. 6 is a side view of a main part showing another example of rigid connection of a round bar.

FIG. 7 is a vertical sectional front view showing an outline of the open shield machine.

FIG. 8 is a vertical sectional side view showing an outline of the open shield machine.

FIG. 9 is a side view showing a first step of the open shield method.

FIG. 10 is a side view showing a second step of the open shield method.

FIG. 11 is a side view showing a third step of the open shield method.

FIG. 12 is a side view showing a fourth step of the open shield method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Open shield machine 1a, 1b ... Side wall plate 1c ... Bottom plate 2 ... Front machine 3 ... Tail machine 4 ... Center folding jack 5 ... Shield jack 6 ... Movable split blade opening 7 ... Soil plate 8 ... Concrete box 9 ... Strut 10 ... Press bar 11 ... Starting pit 12 ... Excavator 13 ... Arrival hole 14 ... Dump 15 ... Grout machine 16a, 16b ... Round steel 17 ... Beam plate 18 ... Band

Claims (4)

[Claims] 1. An open body in which a body consisting of a left and right side wall plate and a bottom plate is divided into a plurality of parts in the front-rear direction, and a front end of a rear body is fitted into a rear end of a front body and can be bent at a mutual fitting part. An open shield machine characterized in that a round bar is arranged in the width direction on the outer periphery of the front end of the rear body in the shield machine, and is joined to the inner periphery of the rear end of the front body via the round steel. 2. The open shield machine according to claim 1, wherein the round steel is rigidly attached to the front ends of the left and right side walls of the rear body. 3. The open shield machine according to claim 1, wherein the round steel is rigidly attached to the front ends of the left and right side walls and the bottom plate of the rear body. 4. Each of the fitting portions of the front body and the rear body has a rectangular body with a beam plate provided between the left and right side walls, and the round steel is formed by a front end of the left and right side walls of the rear body and a bottom plate. The open shield machine according to any one of claims 1 to 3, wherein the open shield machine is attached to the front end and the beam plate so as to surround them from outside.