JPH0593496A - Shield excavator - Google Patents

Abstract

PURPOSE:To mix soil excavated by cutter head with a grout injected into the excavated soil with stirring. CONSTITUTION:While turning a cutter head 2 provided to the tip of a shield body 1, the shield body 1 is advanced. In such a shield excavator, spokes provided to the cutter head 2 are set by deviating them back and forth. Cutters 2c are also provided to the spoles 2a and 2b, and the soil excavated by the cutter head 2 is mixed with a grout injected into the soil by means of the spoles 2a and 2b and the cutter 2c. Since the excavated soil is mixed by using the spokes 2a and 2b of the cutter head 2, the needs to provide stirring blades can be eliminated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shield excavator in which the spokes of a cutter head are used to stir and mix excavated soil and sludge material.

[0002]

2. Description of the Related Art Conventionally, in a soil-cutting type shield and a mud pressure type shield, the excavation is performed while balancing the earth pressure in the chamber provided in the front part of the shield body with the earth pressure of the ground. There is.

As a shield construction method for excavating while balancing the earth pressure in the ground and the earth pressure in the chamber, for example, the one disclosed in Japanese Patent Publication No. 56-54435 is known. The shield construction method disclosed in the above publication is
Behind the cutter head provided in the front part of the shield body, a stirring blade for stirring and mixing the sand excavated by the cutter head and the viscosity imparting material injected into the chamber is provided. By mixing the materials, the excavated earth and sand is made into a highly viscous, impermeable mud with a unit volume almost equal to that of the ground, and the mud is filled in the chamber to reduce the earth pressure in the ground and the chamber. By balancing it, the digging is carried out while preventing the ground from collapsing.

[0004]

However, in the above-mentioned conventional shield construction method, since the shield machine used is provided with a stirring blade for stirring and mixing the excavated soil and the viscosity-imparting material, If there are boulders, etc., the stirring blades will damage the stirring blades and the stirring effect will be reduced at an early stage, and if the stirring blades are damaged, it will be difficult to repair, or even if repairs are possible, many repairs will be required. There were problems such as requiring man-hours. The present invention has been made for the purpose of improving such conventional problems, and an object thereof is to provide a shield machine which is not damaged by cobblestones and which can satisfactorily mix excavated soil and sludge material. is there.

[0005]

In order to achieve the above object, the present invention provides a shield excavator for propelling the shield body while rotating a cutter head provided at a front portion of the shield body. A plurality of spokes provided on the cutter head are provided by shifting the positions in the front and back, and the cutters are attached to these spokes, and the earth and sand excavated by the cutter head and the sludge material injected into the earth and sand are rotated to rotate the cutter head. Accordingly, the spokes and the cutter attached to the spokes are used for stirring and mixing.

[0006]

With the above construction, the spokes of the cutter head and the cutter attached to the cutter can stir and mix the excavated soil and the sludge material, so that it is not necessary to separately provide a stirring blade.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail with reference to the drawings. 1 is a front view of the shield machine, and FIG. 2 is A- of FIG.
A sectional view taken along line A and FIG. 3 are sectional views taken along line BB in FIG.

In these figures, reference numeral 1 is a shield body, and a chamber 1b partitioned by a partition wall 1a is formed in the front portion, and a cutter head 2 is provided in front of this chamber 1b. The cutter head 2 has a plurality of spokes 2
It is configured by arranging a and 2b in a cross shape, for example, and a rotary shaft 3 is provided in the center portion, and an intermediate portion of the rotary shaft 3 is rotatably supported by the partition wall 1a.

A drive source (not shown) is installed on the rear surface of the partition wall 1a, and the cutter head 2 is rotated by the drive source via the rotary shaft 3.
An arrow head cutter 4 is attached to the front end of the rotary shaft 3. Further, in the rotary shaft 3, a slurry material supply passage 3a
Is formed, and one end of the slurry supply path 3a is connected to a slurry injection port 3b opened on the outer peripheral surface of the rotary shaft 3 on the front end side, and the other end is connected to the rear end of the rotary shaft 3. It is connected to a slurry material supply pipe (not shown) via a rotary joint 5 provided, and the slurry material supplied by this slurry material supply pipe is injected from the slurry material injection port 3b into the earth and sand excavated by the cutter head 2. It is supposed to be done.

On the other hand, each spoke 2 of the cutter head 2
As shown in FIG. 1, a and 2b are fixed to the rotary shaft 3 with their positions displaced forward and backward with respect to the excavation direction of the shield body 1. A plurality of cutters 2c and 2d are attached to the front and outer peripheral edges of the spokes 2a and 2b. Of the cutters 2c and 2d, the cutter 2c attached to the front surface of the spokes 2a and 2b is provided on the rear side so that the tips are aligned, even though the spokes 2a and 2b are provided so as to be shifted forward and backward. The allowance X of the cutter 2c attached to the spoke 2b is larger than the allowance Y of the cutter 2c attached to the front spoke 2a.

Next, the operation will be described. The shield body 1 is rotated while the cutter head 2 is rotated by a drive source (not shown).
The propeller, the spokes 2a, 2 of the cutter head 2
The shield head 1 includes the cutters 2c and 2d attached to the b and the arrow head cutter 4 attached to the front end of the rotary shaft 3.
Excavate the front face.

When the excavated earth and sand are taken into the chamber 1a, the spokes 2 are provided with the positions thereof shifted to the front and rear.
It is agitated by a and 2b and a cutter attached thereto, and is agitated and mixed with the slurry material ejected from the slurry material injection port 3b. As a result, the excavated earth and sand are given the same degree of viscosity as the natural ground, are taken into the chamber 1a, and are filled in the chamber 1a. Therefore, excavation is possible while balancing the natural pressure and the earth pressure in the chamber 1a. Become.

Further, by excavating the earth and sand corresponding to the amount of excavation from the chamber 1a by an earth discharging device (not shown) along with the excavation, the excavated earth and sand can be delivered while maintaining the earth pressure in the chamber 1a. In the above embodiment, the cutter head 2 is supported by the rotating shaft 3 provided at the center portion, but a structure is provided in which an intermediate beam is provided and the peripheral portion of the cutter head supported thereby is rotatably supported. Good.

[0014]

As described above in detail, according to the present invention, the plurality of spokes provided on the cutter head are offset from each other in the front-rear direction so that the cutter head excavated by the spokes and the cutter attached to the spokes. Since the sludge material injected into the excavated soil is agitated and mixed, it is possible to agitate and mix the excavated soil and the sludge material without providing a stirring blade as in the conventional case. This simplifies the structure of the agitation unit, thus reducing the cost of the shield machine itself, and because the strong structure of the spokes and cutters mix and mix, the spokes are damaged even if there are cobblestones in the excavated earth and sand. Nothing. Therefore, it is possible to solve problems such as a decrease in stirring effect and a large number of man-hours required to repair the damage.

[Brief description of drawings]

FIG. 1 is a front view of a shield machine according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

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

[Explanation of symbols]

 1 Shield body 2 Cutter head 2a Spoke 2b Spoke 2c Cutter

Claims (1)

[Claims] 1. A shield excavator for propelling the shield body 1 while rotating the cutter head 2 provided at the front portion of the shield body 1, wherein a plurality of spokes 2a provided on the cutter head 2, 2b is provided by shifting the position back and forth, and the cutters 2c are attached to the spokes 2a, 2b. A shield machine, characterized by stirring and mixing with spokes (2a, 2b) and cutter (2c) attached thereto.