JP2797028B2 - Non-circular section shield machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a shield machine capable of excavating into a non-circular cross section, and more particularly, to a shield machine having an excavation function.

<Conventional technology> A shield machine generally has a circular cross section.

Conventionally, it is known that when a curved section is constructed or when the direction of excavation is corrected, the outside of the shield body is dug.

This extra work is carried out by projecting a rod-shaped bit called a copy cutter, which is housed freely on the circumferential surface of the disk-shaped rotary cutter, in the radial direction of the rotary cutter.

<Problems of conventional technology> At present, excavation of a non-circular cross section is attracting attention from the viewpoint of economical efficiency of construction.

Applying the conventional over-digging technique to the excavation of a non-circular cross section is not economically impossible, but it is uneconomical because many extra copy cutters are required.

In addition, access control of a large number of copy cutters becomes complicated.

For this reason, there is a demand for a technique capable of effectively excavating a shield machine having a non-circular cross section.

<Object of the present invention> The present invention has been made in view of the above points, and an object of the present invention is to provide a shield machine having a non-circular cross section which can be easily dug with a simple structure.

<Means for solving the problem> That is, the present invention has a revolving plate that revolves while inscribed in the shield body on the front surface of the shield body, and revolves a plurality of cutter bits protruding from the front surface of the revolving plate. In a shield machine having a non-circular cross section to be excavated, an inner cylinder is provided separately in the shield body, and a partition wall for eccentrically supporting a revolving disk is provided in the inner cylinder, and the inner cylinder and the shield machine are provided. A shield machine having a non-circular cross-section, characterized by interposing an extra-excavation jack capable of moving the inner cylinder in the extra-excavation direction between peripheral surfaces.

Further, the present invention provides a shield machine having a non-circular cross-section, which has a revolving plate that revolves while being inscribed in the shield body on the front surface of the shield body and revolves and excavates a plurality of cutter bits protruding from the front surface of the revolving plate. , A partition wall for eccentrically supporting the revolving disk in the shield body and rotatably supporting the revolving disk is provided, and an excavation jack capable of moving the partition wall in the excavation direction is interposed between the partition wall and the peripheral surface of the shield machine. A shield machine with a non-circular cross section.

<Configuration of the Present Invention> Next, the present invention will be described.

<A> Shield body FIG. 1 shows a horizontal sectional view of the shield machine, and FIG. 2 shows a front view of the cutter face.

Reference numeral 1 denotes a cylindrical shield body 1 having an oval contour.

In addition to the above, the contour of the shield main body 1 can adopt various non-circular shapes corresponding to the excavated cross-sectional shape such as an elliptical shape and a short shape.

<B> The cutter 2 is a revolving plate that is revolvably arranged on the front surface of the shield body 1, and a large number of cutter bits 21 are planted on the front surface of the revolving plate 2.

The outer shape of the revolving wheel 2 has a similar shape to the outer shape of the shield body 1.

The cutter bit 21 is made of a polygonal column, and has a chip embedded in each peak, so that it can be excavated in all directions.

Also, the cutter bits 21 are arranged so that a part of the digging locus of each cutter bit 21 overlaps with each other so that the entire cross-sectional area of the shield body 1 can be excavated.

<C> Revolving Means The present invention is based on the premise that the revolving disk 3 is revolved in parallel with the excavation surface to excavate the entire cross section of the shield main body 1.

That is, the partition walls 3 are provided in a state of being separated from the shield main body 1 side, and the rotating disks 4 and 5 are rotatably provided at a plurality of positions of the partition walls 3.
1 and 51 are connected to each other, the tip of each revolving shaft 41 and 51 is connected to the back side of the revolving disk 2, and the rotation of the rotating disks 4 and 5 in the same direction is received by the rotation of the motor 6 arranged on the back of the partition wall 3 By providing rotation, the revolving disk 2 can be revolved in a state of being inscribed in the contour of the shield main body 1.

What is important when the orbiting plate 2 revolves is that each of the rotating plates 4 and 5 and each of the orbital shafts 41 and 51 are eccentric and that each of the orbiting shafts 41 and 51 has the same rotation angle. 4 and 5, and to give rotation to the rotating discs 4 and 5 in the same direction.

In the drawing, reference numeral 11 denotes an annular shielding plate provided on the inner peripheral surface of the shield main body 1 in front of the partition 3, and reference numeral 12 denotes a pressure receiving bracket provided on the inner peripheral surface of the shield main body 1 behind the partition 3.

<D> Excavation means The shield machine according to the present invention is characterized in that the entire partition 3 including the motor 6 can be moved in a direction perpendicular to the axis of the shield main body 1.

That is, the inner cylinder 7 is positioned on the outer periphery of the partition wall 3, and an extra jack 8 is interposed between the inner cylinder 7 and the peripheral surface of the shield body 1.

One or more sets of extra excavation jacks 8 are arranged at symmetrical positions of the inner cylinder 7.

By arranging the extra excavation jacks 8 at regular intervals between the entire peripheral surfaces of the inner cylinder 7 and the shield main body 1, extra excavation can be performed in all directions.

<Operation> Next, an excavation method will be described.

<A> Straight excavation When going straight through the shield excavator, the length of each of the extra excavation jacks 8 at the symmetrical position is made equal as shown in FIG.

Then, when the motor 6 shown in FIG. 1 is operated to rotate the rotary discs 4 and 5 in the same direction, the revolving disc 3 moves to an inscribed position with the shield body 1 via the revolving shafts 41 and 51. Orbiting while revolving.

With the revolution of the orbiting plate 2, each cutter bit 21 group starts revolving at the same time, and excavation by the cutter bits 21 in a direction orthogonal to the excavation surface proceeds.

When the revolution board 2 completes one revolution, excavation of the entire cross section of the shield main body 1 is completed.

Thus, the shield machine is made to go straight while excavating the entire cross section of the shield body 1.

<B> Excavation When constructing a curved section or when it is desired to perform extra excavation to correct the direction of excavation, one of the opposing extra excavation jacks 8a and 8b as shown in FIG. And at the same time, the other extra excavation jack 8a is contracted, and the inner cylinder 7 is moved in parallel in the extra excavation direction.

The revolving disk 2 is revolved while the inner cylinder 7 is translated.

With the movement of the inner cylinder 2, the excavation range of the revolving disk 2 moves in parallel in the direction of extra excavation.

After completion of the excavation, the inner cylinder 2 is returned to the original position, and the remaining portion 9 is excavated.

 A predetermined amount is dug while repeating the above.

<Other Embodiment 1> FIG. 5 shows another shield machine.

The shield machine has a structure in which the inner cylinder 7 of the above-described embodiment is omitted, and the partition 3 is directly supported by a plurality of extra excavation jacks 8.
Are configured to be able to move in parallel in a direction perpendicular to the axis.

<Other Embodiment 2> Although the case where the cutter bit is revolved and excavated has been described above, the present invention can be applied to various known rotary excavation types.

<Effects of the Present Invention> Since the present invention employs the above-described structure, the following effects can be expected.

<A> By simply jacking the drive source that gives the revolving wheel a motion for excavation in the direction of excavation, overexcavation can be easily performed.

Therefore, it is most suitable for the excavation of a non-circular cross section which has been difficult until now.

<B> No extra bits or cutters are necessary.

[Brief description of the drawings]

 Fig. 1: Horizontal cross section of shield excavation Fig. 2: Cross section of II-II in Fig. 1 Fig. 3: Cross section of III-III in Fig. 1 Fig. 4: Cross section of shield excavation at the time of excavation Fig. 5: Cross section of another shield machine

Continued on the front page (72) Inventor Fumiya Takano 650 Kandate-cho, Tsuchiura-shi, Ibaraki Pref.Hitachi Construction Machinery Co., Ltd. (58) Field surveyed (Int.Cl. ⁶ , DB name) E21D 9/06 301 E21D 9/08

Claims (2)

(57) [Claims] 1. A shield excavator having a non-circular cross section having a revolving disk on the front surface of a shield body and revolving while being inscribed in the shield body and revolving a plurality of cutter bits protruding from the front surface of the revolving disk. An inner cylinder is provided separately in the shield body, a partition wall for eccentrically supporting the revolving disk is provided in the inner cylinder, and the inner cylinder is excavated in a direction between the inner cylinder and a peripheral surface of the shield machine. A shield machine with a non-circular cross section, characterized by interposition of an extra excavation jack that can be moved to the outside. 2. A shield machine having a non-circular cross-section, wherein a revolving disk that revolves while being inscribed in the shield body is provided on the front surface of the shield body, and a plurality of cutter bits protruding from the front surface of the revolving disk are revolved and excavated. A partition wall is provided in the shield body to eccentrically support the revolving disk and is rotatably supported, and an excavation jack capable of moving the partition wall in the direction of excavation is interposed between the partition wall and the peripheral surface of the shield machine. A shield machine with a non-circular cross section.