JPH04293897A - Separate type shield excavator - Google Patents

Abstract

PURPOSE:To prevent a large load from operating by a natural ground to an oscillating arm cutter when the oscillating arm cutter is stopped at the oscillation end to turn back. CONSTITUTION:Plural shield machines 13 and 14 furnishing rotary cutters 17 and 18 for excavating a natural ground at the front side are lined up in parallel under placing a specific interval. And oscillating arm cutters 20 which turn back at the rear side of the rotary cutters 17 and 18 and excavate the remaining part of the natural ground other than the part excavated by the rotary cutters 17 and 18, of the natural ground of the form to compose the section outline of the shield machines 13 and 14, are provided at the rear side of the rotary cutters 17 and 18.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention is a separate type in which a plurality of shield machines are provided, and these shield machines work together to excavate a tunnel with an enlarged excavation cross section, or individually excavate a tunnel with a circular cross section. It concerns shield tunneling machines.

0002

[Prior Art] As is well known, in the shield construction method, a cutter device installed at the front of a shield excavator having a cylindrical outer skin plate excavates the ground, and a cylindrical divided body is excavated inside the shield excavator. By assembling the segments and extending the shield jack inside the shield excavator by taking a reaction force at the front end of the segment, the entire shield excavator is propelled forward, and by repeating these steps, a tunnel is created underground. This is a method of forming.

The cross section of excavation by this shield excavator is a circular cross section whose diameter is approximately equal to the outer diameter of the skin plate. However, inside tunnels, when excavating underground stations or branching or merging parts of urban road tunnels,
It is necessary to make the excavation cross section larger than the normal excavation cross section. In such cases, conventionally, a separate type shield excavator shown in FIGS. 4 and 5 has been used.

[0004] In FIGS. 4 and 5, what is indicated by the entire reference numeral 1 is a separate type shield tunneling machine (hereinafter simply referred to as an "excavating machine").
), and this excavator 1 consists of two shield machines 2, 2 installed in parallel at a predetermined interval with their axes parallel to each other, and a machine installed behind these shield machines 2, 2. It is roughly composed of a reaction force body 3 that is

The shield machine 2 is a commonly used shield machine with a well-known configuration, and has a rotary cutter 5 for excavating the earth at the front of a cylindrical skin plate 4, and a rotary cutter 5 for excavating the ground on the inner peripheral surface of the rear part. A plurality of propulsion jacks 6, 6 are provided at intervals in the circumferential direction. The working end 6a of this propulsion jack 6 is directed toward the rear of the shield machine 2. The scale of each shield machine 2 is almost the same, and the rotary cutters 5, 5 are also provided so as to be located on the same plane.

The reaction body 3 is formed into a cylindrical shape with a diameter that allows it to be inserted into the skin plate 4 of each shield machine 2, and the front end is in contact with the working end 6a of the propulsion jack 6. The parts 3a, 3a are connected to the rear of the insertion parts 3a, 3a, and are formed in a cocoon shape (see FIG. 5) in which the outer diameter contours of the skin plates 4, 4 of each shield machine 2, 2 are connected. The main body portion 3b is generally composed of a main body portion 3b.

This reaction body 3 has a swinging arm that excavates the remaining part excavated by the rotary cutter 5 of each shield machine 2, 2 from the ground surrounded by the outer contour of the main body 3b. A cutter 7 is provided at the center of the main body 3b and is located on the same plane as the rotary cutter 5 of the shielding machine 2.

Furthermore, on the inner surface of the main body portion 3b of the reaction force body 3,
A plurality of propulsion jacks 8 are provided at intervals in the circumferential direction. The working end 8a of the propulsion jack 8 is directed toward the rear of the reaction force body 3 and comes into contact with the assembled segment 9.

When forming a tunnel such as an underground station with an excavated cross section extending long in the width direction or height direction using the conventional apparatus described above, as shown in FIG. The tunneling machine 1 with the shield machines 2, 2 and the reaction force body 3 combined is launched from the location, and a tunnel is formed by this tunneling machine 1. That is, while excavating the ground with the rotary cutter 5 and swing arm cutter 7 of the shield machine 2,
By assembling the segments 9 into a cocoon shape using the erector devices 10, 10 in the reaction force main body part 3b, and taking a reaction force to the front end of these assembled segments 9, the propulsion jack 8 is extended, and the excavator Propel the entire unit forward. By repeating these steps, a tunnel can be formed underground.

When forming a tunnel with a normal circular excavation cross section, such as at a branch point, after stopping tunnel formation by the excavator 1 at that point, each shield machine 2, 2 is moved as shown in FIG. It is launched from the front of the reaction force body 3, and a tunnel is formed by these shield machines 2, 2. That is,
As is well known, while excavating the earth with the rotary cutter 5 of the shield machine 2, the segments 11 are assembled in a cylindrical shape within the skin plate 4, and further, by taking a reaction force at the front end of these assembled segments 11, propulsion is achieved. By extending the jack 6, the entire shield machine 2 is propelled forward. By repeating these steps, multiple tunnels with circular excavation cross sections can be individually excavated underground.

[0011]

[Problems to be Solved by the Invention] When excavating a long excavation section such as an underground station using the conventional excavator 1, the swing arm cutter 7 is a rotary cutter as shown in FIGS. 4 and 5. 5
, 5 is exposed at the front, and the remaining portion excavated by the rotary cutters 5, 5 is excavated while repeating reciprocating and reversing rocking. When the swing arm cutter 7 is reversed at the swing end, it will stop for a short time and then swing in the opposite direction.

Even while the swing arm cutter 7 is stopped for reversal, excavation by the rotation of the rotary cutters 5, 5 continues, and the entire excavator 1 is propelled forward. Therefore, the rocking arm cutter 7 that has stopped for reversal is subjected to a large force due to the ground, which has the drawback of increasing the excavation resistance of the excavator.

The present invention eliminates these conventional drawbacks and
To provide a separate type shield excavator which prevents a large force from being applied to the swing arm cutter by the ground and increases excavation resistance when the swing arm cutter stops for reversal at the swing end. The purpose is to

[0014]

[Means for Solving the Problems] A separate type shield excavator of the present invention has a plurality of shield machines each having a rotary cutter for earth excavation in the front part arranged in parallel at a predetermined interval, and behind the rotary cutter. a swinging arm cutter having a swinging center at , and excavating the remaining portion of the ground excavated by the rotary cutter among the ground having a shape that reverses behind the rotary cutter and connects the cross-sectional contour of the shield machine; It is characterized in that it is provided at the rear of the rotary cutter.

[0015]

[Operation] When the swing arm cutter stops for reversal, the swing arm cutter is hidden behind the rotary cutter and is no longer exposed to the front.

[0016]

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a front view of an embodiment of the present invention when FIG. 2 is viewed from the direction I, and FIG. 2 is a cross-sectional view, in which the entire reference numeral 12 represents a separate type according to the present embodiment. This is a shield tunneling machine (hereinafter simply referred to as "excavation machine"), and this tunneling machine 12 consists of two shield machines 13 and 14 that are arranged in parallel at a predetermined interval with their axes parallel to each other. and a reaction force body 3 provided at the rear of these shield machines 13 and 14. Skin plate 1 of shield machine 13, 14
Rotary cutters 17, 18 for earth excavation are installed at the front of 5, 16.
are located on the same plane.

The reaction body 3 includes insertion portions 3a, 3a formed in a cylindrical shape with a diameter that can be inserted into the skin plates 15, 16 of each shield machine 13, 14, and these insertion portions 3a, 3a.
The main body part 3b is connected at the rear of the shield machines 13 and 14 and is formed in a shape in which the outer contours of the skin plates 15 and 16 of the shield machines 13 and 14 are connected in an arc shape.

The reaction body 3 is provided with shield machines 13, 1 from the ground surrounded by the outer contour of the main body 3b.
Two spoke-shaped rotary cutters 19 excavate most of the remaining portion excavated by the rotary cutters 17 and 18 of No. 4.
The spoke-shaped rotary cutters 19 are arranged above and below the center of the cutter b, and the spoke-shaped rotary cutters 19 are positioned behind the rotary cutters 17 and 18.

Skin plate 1 of shield machine 13, 14
5, 16 At the upper and lower parts of the front part near the rotary cutter 19,
A swing arm cutter 20 is provided behind the rotary cutter 19. As shown in FIG. 1, the swing center 21 of the swing arm cutter 20 is behind the rotary cutters 17 and 18, and one reversal position 22 of the swing arm cutter 20 is behind the rotary cutters 17 and 18. The other reversing position 23 is located behind the rotary cutter 19. The swing arm cutter 20 swings back and forth between reversal positions 22 and 23 around a swing center 21, and cuts the rotary cutter 17, The remaining portion excavated by steps 18 and 19 is excavated, and the excavator 12 as a whole excavates a tunnel 24 having an oval outline as shown in FIG.

The swing center 21 of the swing arm cutter 20 is located behind the rotary cutters 17 and 18, one reversal position 22 is located behind the rotary cutters 17 and 18, and the other reversal position 23 is located behind the rotary cutters 17 and 18. Since it is placed behind the rotary cutter 19, when the swing arm cutter 20 stops for reversal, it is hidden behind the rotary cutters 17, 18, and 19 and is not exposed to the front, so that the force from the ground is not a load. It will be in a state where it will not be done.

When forming a tunnel with a normal circular excavation cross section, such as at a branch point, the swing arm cutter 20 is stopped at the reversal position 22 and is hidden behind the rotary cutters 17 and 18, so that the shield machines 13 and 14 When the rotary cutter 19 is started from the reaction body 3, the rotary cutter 19 remains at the branch point together with the reaction body 3, and the rotary cutters 17 and 18 of the shield machines 13 and 14 can individually excavate a tunnel with a circular excavation cross section. .

[0023]

Effects of the Invention: The swing arm cutter of the present invention reverses its swing behind the rotary cutter, so when it stops for reversal, it hides behind the rotary cutter and is not exposed to the front. This has the effect that the excavation resistance of the excavator does not increase because it does not receive a large force from the excavator.

[Brief explanation of the drawing]

FIG. 1 is a front view of an embodiment of the present invention when FIG. 2 is viewed from the I direction.

FIG. 2 is a cross-sectional view of one embodiment of the invention.

FIG. 3 is a cross-sectional view of an excavated tunnel.

FIG. 4 is a cross-sectional view of a conventional device.

FIG. 5 is a front view of FIG. 4;

FIG. 6 is a sectional view showing a tunnel being formed using a separate shield excavator.

[Explanation of symbols]

12 Separate shield excavator 13, 14 Shield machine 17
,18,19 Rotary cutter

Claims (1)

[Claims] Claim 1: A plurality of shield machines each having a rotary cutter for earth excavation at the front are installed in parallel at a predetermined interval, and the shield machine has a swing center behind the rotary cutter and is inverted behind the rotary cutter. A swing arm cutter is provided at the rear of the rotary cutter to excavate the remaining portion of the earth excavated by the rotary cutter among the rock having a shape that connects the cross-sectional contour of the shield machine. Separate type shield excavator.