JPH03202590A - Shield excavator - Google Patents

Abstract

PURPOSE:To facilitate execution by providing the front drum having the other side capable of expanding in the direction of the shaft center against one side and the rear drum to a shield cylinder, providing clippers capable of penetrating a bedrock to both drums and, at the same time, providing a driving jack. CONSTITUTION:Clippers 17 and 18 of the front drum 2 and rear drum 3 are projected, and a rotary cutter 9 is rotated in a state to penetrate the clippers into a bedrock to drive forward. Then, after they are moved forward by a certain length, the clipper 18 is projected, the clipper 17 is pulled back, a driving jack 4 is expanded to retreat the rotary cutter 9, and the front drum 2 is driven forward. After that, the excavated earth is removed by a stirring spoke 10, the clipper 17 is penetrated into the bedrock, the clipper 18 is pulled back, the jack 4 is shortened to advance the rear drum 3 by one stroke, and it is driven forward. According to the constitution, high speed execution with safety can be carried out by giving reaction force to the clippers 17 and 18.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a shield excavator that excavates while assembling a lining wall made up of segments at the rear.

(Prior Art) A conventional shield tunneling machine is equipped with a rotary cutter at the front end of a cylindrical shield tube, and a segment assembly device inside the rear end, and a shield assembled on the rear side by the segment assembly device. A hydraulic jack for propulsion that takes a reaction force against the excavation wall is installed in the shield cylinder, and the hydraulic jack moves the entire shield cylinder forward and provides a reaction force during excavation.

(Problems to be Solved by the Invention) Conventional shield excavators like this are propelled while being pushed out under the earth pressure of the surrounding ground, which generates a large reaction force. Since it is supported by a lining wall made of segments assembled at the rear, if the bearing strength of the ground is low, the lining will buckle. For this reason,
There was a problem in that the shield excavator could not be propelled until the strength of the ground was sufficiently strengthened by the backing material for the lining and the ground hardening agent, resulting in a long construction period.

In view of the above-mentioned conventional problems, the present invention aims to provide a shield excavator that can be propelled without placing a load on the rear lining by segments and can perform high-speed construction.

(Means for Achieving the Object) A feature of the shield excavator of the present invention for solving the above-mentioned conventional problems and achieving the intended purpose is that a rock is inserted into the front end of the cylindrical shield tube. In a shield excavator equipped with a rotary cutter for excavating and a segment assembly device at the rear end, the shield cylinder is configured with a front body and a rear body, the other side of which is expandable and retractable in the axial direction. and providing the partition wall and the rotary cutter on the front body,
The segment assembly device is provided in the rear body, grippers projecting from the outer circumferential surface and penetrating into the ground are provided on both bodies, and a propulsion jack is provided for compressing the space between the two bodies.

(Function) In this shield excavator, when excavating with a rotary cutter with the gripper protruding from both the front and rear bodies and penetrating the ground, the reaction force at the time of excavation is received by the gripper, and the rear No load is applied to the lining wall. In addition, by protruding the gripper on the rear body and extending the propulsion jack with the gripper on the vJ body retracted, the reaction force is taken by the gripper on the rear body and the front body is moved forward, and then the front body is moved forward. By protruding the gripper and retracting the propulsion jack with the gripper on the rear body retracted, the f& body is propelled toward the front body by taking a reaction force to the gripper on the front body, thereby promoting overall propulsion. will be done.

In any of the above cases, the reaction force of propulsion is not transmitted to the rear lining wall.

(Example) Next, embodiments of the present invention will be described with reference to the drawings.

In the figure, 1 is a cylindrical shield tube, and this shield FJI is composed of a front body 2 and a t&E3. The rear end of the front body 2 is fitted outside the slide portion 3b on the outer periphery of the tip of the rear body 3 so as to be freely slidable in the axial direction. A propulsion jack 4 is connected between the two shots 2 and 3 to extend and contract them in the axial direction.

A partition wall 5 is provided at approximately the center of the front body 2 to partition the inside into front and rear parts, and the front side of the partition wall 5 serves as an excavation and kneading chamber 6.

A bearing 7 is fixed to the central part of the partition wall 5.
A cutter shaft 8 is axially slidable and rotatably supported. A rotary cutter 9 is fixed to the tip of the cutter shaft 8.

Further, inside the chamber 6, a stirring spoke 10 for excavating and kneading soil is housed, which is located on the front side of the partition wall and rotatably supported by the cutter shaft 8. An internal gear 11a is fixed, and a pinion gear llb of a drive motor 12 fixed to the partition wall 5 is attached to the internal gear 11a.
are engaged with each other, and are driven to rotate separately from the rotary cutter 9.

At the bottom of the partition wall 5, there is a screw conveyor 1 for carrying out the excavated soil.
3 are connected to each other so that the earth and sand excavated by the rotary cutter 9 and mixed by the stirring spokes 10 is carried out to the rear.

A segment assembly device F14 is provided inside the rear shell 3, and the segments 15 are assembled within the rear end so that the cylindrical lining is successively extended. Further, a segment push-out jack 16 is provided on the front side of the segment assembly section.

A plurality of grippers 17 are provided on the front body 2 and the rear body 3, respectively.
, 18 are provided.

As shown in FIG. 3, each of the grippers 17 and 18 is housed in a gripper case 19 whose tip is opened on the outer periphery of the cylinder 2 (and 3) so that it can be taken in and out.
It is designed to be operated in and out by 0.

Next, the excavation process using the shield excavator constructed as described above will be explained with reference to FIG. 4. First, as shown in FIG. 4(A), with the grippers 17 and 18 of the front body 2 and rear body 3 protruding and penetrating into the ground, the rotary cutter 9 is rotated and advanced to remove the ground. excavate.

At the same time, the stirring spoke 10 is also rotated to mix the excavated soil with the mud, and the zero-rotation cutter 9, which is sequentially carried out by a screw conveyor, is advanced by a certain length, and then, as shown in FIG.
As shown in FIG. 4(c), the gripper 18 of the rear trunk 3 is projected, and the gripper 17 of the front Jr. J2 is retracted.Then, the propulsion jack 4 is extended as shown in FIG. As a result, a propulsive force acts on the front trunk 2 while the reaction force is received by the gripper 18. By retracting the rotary cutter 9 in accordance with the extension of the propulsion jack 4, the front f12 is propelled while excavation is stopped.

At this time, the stirring spoke 10 continuously stirs the excavated soil and discharges the excavated soil.

After moving the front body 2 forward by one stroke in this way,
As shown in FIG. 4(d), the gripper 17 of the front body 2 is projected and penetrated into the ground, and the gripper 18 of the rear body 3 is retracted.

Next, the propulsion jack 4 is retracted. As a result, the rear trunk 3 is moved forward by one stroke with the reaction force being received by the gripper 18, and the entire shield excavator is propelled by one stroke.

In addition, when the rear fuselage is propelled, the segment extrusion jack 16 is extended in accordance with the forward movement of the rear fuselage, and the segments 15 assembled earlier in the f&Ir1B are extruded rearward.

In addition, although the above-mentioned Example shows the example implemented to the so-called earth excavation and kneading type shield excavation machine, it goes without saying that it may be implemented to other shield excavation machines.

(Effects of the Invention) As described above, the shield tunneling machine of the present invention has a shield tube composed of a front body and a rear part, and the space between the parts is extendable and retractable by means of jacks, and grippers that penetrate into the ground at each part are provided. - By equipping the gripper, it is possible to have all the reaction force during excavation and propulsion.
Therefore, it is possible to excavate without applying any load to the lining made of the rear segments, and backfilling outside the lining can be done.
It becomes possible to propel the shield excavator regardless of ground improvement, allowing safe and high-speed construction.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a sectional view schematically showing the entire device, FIG. 2 is a sectional view taken along line AA in FIG. 1, and FIG. 3 is a sectional view taken along line BB in FIG. Line sectional views and FIGS. 4(A) to 4(2) are sectional views of the excavation process. l...Shield tube, 2...Front body, 3.
... Rear body, 4 ... Propulsion jack, 5.
...Partition wall, 6...Chamber, 7...
...Bearing, 8...Cutter shaft, 9...
・Rotary cutter 10... Stirring spoke, lla
...Internal gear, 11b... Pinion gear, 12... Drive motor 13... Screw conveyor, 14... Segment assembly device, 15 ...Segment, 16...Segment extrusion jack, 17.18
...Gripper 1...Gripper case, 20...Hydraulic cylinder Fig. 4

Claims (1)

[Claims] In a shield excavator comprising a rotary cutter for excavating earth at the front end of a cylindrical shield tube and a segment assembly device at the rear end, the shield tube is placed on one side and the other side is axially oriented. comprising a telescopic front body and a rear body, the front body is provided with the partition wall and the rotary cutter, the rear body is provided with the segment assembly device, and both bodies protrude from the outer peripheral surface and penetrate into the ground. A shield excavator characterized by being equipped with a flexible gripper and a propulsion jack that expands and contracts between the two bodies.