JPH0612596U - Horseshoe shield machine - Google Patents

Abstract

(57) [Abstract] [Purpose] To reduce wear of the auxiliary cutter and to prevent difficult soil discharge due to compaction and closing of soil. [Structure] The leading cutter head 2 is provided in front of the shield body 1.
A pair of trailing cutter heads 3 having a smaller diameter than the preceding cutter head 2 are rotatably provided, and a tunnel having a horseshoe-shaped cross section is excavated by the cutter heads 2 and 3.
A horseshoe-shaped shield excavator in which a cutting face left by each of the cutter heads 2 and 3 is excavated by an auxiliary cutter 10, and the auxiliary cutter 10 has a plurality of spokes 10c in a radial direction and is rotationally driven. Body 10b
And a cutter 10e attached to the ends of the spokes 10c of the cutter body 10b.
Since there is no rear surface resistance of e, the wear of the cutter 10e can be reduced, and since the soil is not compacted and blocked, it is not difficult to remove the soil.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a horseshoe shield excavator with an improved auxiliary cutter.

[0002]

[Prior art]

 In recent years, due to the increase in underground structures due to overcrowding in urban areas, various restrictions have been placed on tunnels built underground in urban areas. Along with this, a horseshoe shield machine has been proposed for excavating a tunnel with a horseshoe-shaped cross section, which has a smaller excavation width than the conventional tunnel with a circular cross section. In addition, in the conventional horseshoe shield excavator, in addition to the leading and trailing cutter heads that excavate the horseshoe-shaped cross section, an auxiliary cutter that excavates the uncut portion of the trailing cutter head is provided at the front of the shield body. It is provided for excavating a horseshoe-shaped tunnel with the leading and trailing cutter heads and this auxiliary cutter.

[0003]

[Problems to be solved by the device]

 However, since the auxiliary cutter provided in the conventional horseshoe-shaped shield excavator has a structure in which the arm is swung to excavate the face by the cutter attached to the tip of the arm, it is necessary to use a double-edged cutter. As a result, the back surface resistance of the cutter increased, and the cutter was worn early due to an increase in excavation torque. In addition, since the excavation direction is not constant due to rock excavation, there were problems such as soil being compacted and blocked by the cutter, making it difficult to remove the soil. The present invention has been made in order to solve the above-mentioned conventional problems, and an object thereof is to provide a horseshoe-shaped shield machine having an auxiliary cutter that does not cause wear of the cutter and does not block the soil compaction. Is.

[0004]

[Means for Solving the Problems] In order to achieve the above object, the present invention rotatably installs a leading cutter head and a pair of trailing cutter heads having a smaller diameter than the leading cutter head at the front of the shield body. In addition to excavating a horseshoe-shaped tunnel with these cutter heads and excavating the face left uncut by each cutter head with an auxiliary cutter, in the horseshoe-shaped shield machine, the auxiliary cutters are radiated into a plurality of spokes. It is composed of a cutter body which has a rotation and is driven to rotate, and a cutter which is attached to the spoke tip of the cutter body.

[0005]

[Action]

 Since the excavation torque can be made smaller than the auxiliary cutter that swings and excavates with the above configuration, the wear of the cutter can be reduced, and since the cutter rotation surface is inclined forward and downward, the soil compaction is not blocked. There will be no problems such as difficulty in discharging sediment.

[0006]

【Example】

 An embodiment of the present invention will be described in detail with reference to the drawings. 1 is a front view of the horseshoe shield machine, FIG. 2 is a longitudinal sectional view of the same, and FIG. 3 is a sectional view taken along line XX of FIG. In these figures, reference numeral 1 is a shield body, which has a horseshoe-shaped cross section as shown in FIG. 3, and a circular leading cutter head 2 as shown in FIG. A pair of trailing cutter heads 3 having a smaller diameter than the leading cutter head 2 are rotatably provided.

The trailing cutter head 3 having a smaller diameter than the leading cutter head 2 is located behind the leading cutter head 2, and the leading cutter head 2 is a cutter head motor 4 and the trailing cutter head 3 Are respectively rotated by the cutter head motor 5 to excavate the face in a horseshoe shape by the cutters 2a and 3a provided on the front surface, and the excavated earth and sand are taken into the chamber 1b from the earth and sand intake ports 2b and 3b. Is becoming. The muddy water is injected into the chamber 1b through the mud sending pipe 6, and the earth and sand taken into the chamber 1b is mixed with the mud water to be slurried, and then the mud sending pipe 7 is used from the inside of the chamber 1b to shield the main body. It is designed to be discharged to the rear through the inside of 1.

On the other hand, between the trailing cutter heads 3 and on both side surfaces, auxiliary cutters 10 for excavating the earth and sand left by the trailing cutter heads 3 are provided. The auxiliary cutter 10 is rotatably supported by a drive shaft 10a at a tip of a hollow support member 1c projecting forward and downward from a partition wall 1a of the shield body 1 with a center line slightly inclined forward through a bearing 11. ing.

The drive shaft 10a is connected to an auxiliary cutter motor (both not shown) in the shield body 1 via a power transmission means such as a chain or a gear train provided in the support member 1c. The motor rotates in the direction of arrow A in FIG. 6, and a cutter body 10b is attached to the lower portion of the drive shaft 10a. The cutter body 10b has a plurality of spokes 10c in the radial direction, and a cutter 10e having a blade 10d in the rotational direction is attached to the lower surface of the spokes 10c on the tip side.

Further, by tilting the central axis of the drive shaft 10a forward, the rotation surface of the cutter 10e is tilted at an angle θ with respect to the skin plate 1d of the shield body 1, and thus the tip of the skin plate 1d is tilted. As shown in FIG. 5, it can be provided so as to be wrapped with the cutter body 10b, and a gap B that gradually widens backward is formed between the lower surface of the cutter 10e and the skin plate 1d. Is prevented from being closed by compression. The side auxiliary cutter also has the same function.

Further, the upper surface of the spoke 10c of the cutter body 10b is an inclined surface whose tip side is inclined low, and a digging rake surface C is formed in a hatched portion shown in FIG. Since the auxiliary cutters 10 provided on both sides of the lower part of the shield body 1 have the same structure, detailed description thereof will be omitted. Further, reference numeral 12 in the figure denotes an agitator for stirring the earth and sand and the muddy water taken into the chamber 1b.

Next, the operation will be described. The shield main body 1 is propelled while rotating the leading cutter head 2 and the trailing cutter head 3 to excavate a tunnel having a horseshoe-shaped cross section by these cutter heads 2 and 3 and at the same time. The cutter body 10b of the auxiliary cutter 10 is rotated to excavate the part of the face left uncut by the trailing cutter head 3 with these auxiliary cutters 10. Since the auxiliary cutter 10 is rotated in one direction to excavate the face, it has less rear surface resistance than the conventional rocking excavator. Therefore, it is possible to excavate with a small excavating torque and the rotating surface of the cutter 10e. Is inclined in advance by the angle θ, so that when the excavated earth and sand is taken into the chamber 1b, it is not tightly closed in the gap B between the cutter body 10b and the skin plate 1d of the shield body 1. Moreover, since the excavation rake face C is formed by making the upper surface of the spokes 10c of the cutter main body 10b into the forward descending slope, the excavated earth and sand can be excavated while naturally collapsing, and at the same time, the soil compaction is also prevented. can do.

[0013]

[Effect of device]

 As described in detail above, this invention can excavate a horseshoe-shaped tunnel, so it can be easily constructed even in places with limited separation, such as underground areas in urban areas, and the cutter head can be rotated by an auxiliary cutter that rotates in one direction. Since the face left after cutting is excavated, the excavation torque can be reduced as compared with the conventional excavation by swinging the auxiliary cutter. As a result, the size of the auxiliary cutter motor can be reduced, and the life of the cutter can be extended, so the cutter can be replaced longer, which is economical. Furthermore, since the rotating surface of the cutter is tilted forward and downward, a gap that expands backward is formed between the skin plates of the shield body, which makes it difficult to discharge the sand due to the compaction of the sand. In addition to eliminating problems such as the above, the gap between the cutter body and the skin plate can also be made smaller, so it is possible to prevent the face from collapsing and sinking the ground caused by taking in dirt more than necessary. You can

[Brief description of drawings]

FIG. 1 is a front view of a horseshoe-shaped shield excavator according to an embodiment of the present invention.

FIG. 2 is a vertical sectional view of a horseshoe-shaped shield excavator according to an embodiment of the present invention.

FIG. 3 is a sectional view taken along line XX of FIG.

FIG. 4 is an arrow view from the Y direction of FIG.

FIG. 5 is an enlarged side view of an auxiliary cutter according to an embodiment of the present invention.

FIG. 6 is an enlarged bottom view of an auxiliary cutter according to an embodiment of the present invention.

FIG. 7 is a sectional view of an auxiliary cutter according to an embodiment of the present invention.

FIG. 8 is an operation explanatory view of the auxiliary cutter according to the embodiment of the present invention.

[Explanation of symbols]

 1 Shield body 2 Leading cutter head 3 Trailing cutter head 10 Auxiliary cutter 10b Cutter body 10c Spokes 10e Cutter

Claims (2)

[Scope of utility model registration request] 1. A leading cutter head 2 and a pair of trailing cutter heads 3 having a diameter smaller than that of the leading cutter head 2 are rotatably provided on the front part of the shield body 1, and these cutter heads 2 and 3 have a horseshoe-shaped cross section. In a horseshoe-shaped shield excavator that excavates a tunnel and excavates the face left uncut by the cutter heads 2 and 3 with the auxiliary cutter 10, the auxiliary cutter 10 has a plurality of spokes 10c in the radial direction, Cutter body 10 that is driven to rotate
A horseshoe-shaped shield excavator comprising b and a cutter 10e attached to the ends of the spokes 10c of the cutter body 10b. 2. The horseshoe-shaped shield excavator according to claim 1, wherein the rotation center of the cutter body 10b is inclined forward so that the rotation surface of the cutter 10e is inclined forward and downward.