JPS6353359B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a gripper for a tunnel excavating machine, and more particularly to a gripper for a tunnel excavating machine that includes cells that expand and contract under fluid pressure.

In tunnel boring machines such as tunnel boring machines and cast-in-place lining type shield machines that excavate tunnels, the propulsion reaction force is applied to the ground or lining surface via grippers.

Conventional grippers of this type were made of iron, and a hydraulic jack built into the gripper was used to spread the gripper over the ground or lining, thereby transmitting the propulsion reaction force.

As a result, the gripper has a large weight and a complicated structure, and the peripheral surface of the gripper is made of iron and has an arc shape, so if the contact surface with the ground or lining is uneven, the load will not be applied evenly. However, the disadvantage was that the desired reaction force could not be obtained.

Also, if the contact surface of the ground or lining is too smooth, it will slip and you will not be able to obtain a reaction force, and if you try to obtain a reaction force by installing claws or protrusions on the gripper side to prevent slipping, the lining surface will be damaged. This causes the inconvenience of putting it away.

The present invention has been made to eliminate the above-mentioned drawbacks of the conventional technology.It is lightweight, provides a reliable reaction force, is not affected by the condition of the contact surface, and is capable of excavating tunnels without damaging the lining. The purpose is to provide a grip on time.

In order to achieve the above object, the present invention employs expandable cells in the parts that come into contact with the ground or lining, and expands and contracts the cells with fluid pressure such as liquid or air to remove the cells from the ground or lining. We adopted a structure that allows us to obtain sufficient reaction force.

Hereinafter, details of the present invention will be explained based on embodiments shown in the drawings.

FIG. 1 explains the construction state using the gripper according to the present invention, and shows an example in which it is used together with a cast-in-place lining type shield machine.

In the figure, 1 excavates the tip of the tunnel using a shield machine.

The shield machine 1 is equipped with a plurality of propulsion jacks 2 at its rear end, and is further provided with a tail portion 3.

The rod end of the propulsion jack 2 is in contact with the tip of the segment type formwork 4.

This formwork 4 has the same length as the effective length of the propulsion jack 2, and a short formwork is used for the sharply curved portion.

A plurality of formworks 4 are provided and are sequentially removed from the rear end as the poured concrete hardens.

A gripper 5 is arranged at the rear end of the formwork 4. The gripper 5 is provided with a plurality of expandable and retractable cells as will be described later.

The gripper 5 is supported by frictional force between it and the inner peripheral surface of the completed tunnel, and can sufficiently withstand pressure in the direction of propulsion and maintain its position.

Reference numeral 7 denotes a concrete pouring pump, and a concrete mixer 8 is connected to the rear end of the pump, which moves forward as the tunnel is excavated.

A concrete pouring pipe 9 extends from the concrete pouring pump 7, and its tip extends toward the most advanced formwork 4 side.

The outside of the most advanced formwork 4 is the part where concrete is about to be poured, and reinforcing bars 10 are assembled on the outside of the formwork.

A concrete stopper formwork 11 is placed outside the formwork to be currently poured, and the tip of the concrete pouring pipe 9 is guided through this stopper formwork 11.

A concrete press jack 12 separate from the propulsion jack is arranged outside the stop form 11, and its rod end is in contact with the stop form 11.

By the way, the gripper 5 has a cylindrical body 13, as shown in an enlarged view in FIG. are located adjacent to each other.

The cell 6 has a structure in which air, liquid, etc. can be supplied through a pressure feeding device (not shown).

Furthermore, wheels 14 for moving the gripper are attached to symmetrical positions at the bottom of the cylinder 13, and these wheels 14 are in contact with the circumferential surface of the lining 15.

Note that the gripper 5 according to the present invention may be in direct contact with the rearmost end of the formwork 4, but it is also possible to provide a jack on the gripper side and contact the rear end of the formwork 4 through this jack.

Next, a digging operation using the gripper according to the present invention will be explained.

First, the gripper 5 is placed in contact with the rearmost end of the formwork 4, and fluid pressure is applied to the cell 6 to expand it, apply large pressure to the lining 15, generate sufficient reaction force, and fix the gripper 5. do.

At this time, since the cells 6 are made of an elastic member, they fit well under any condition of the contact surface of the lining 15 and do not damage the surface of the lining.

Next, at the leading edge of the excavation work by the shield machine 1, when the excavation has progressed by the length of the formwork 4, the excavation work is temporarily stopped, and reinforcing bars 10 are assembled at the part where concrete is to be poured.

Subsequently, a formwork 4 is assembled in this part, a stop formwork 11 is placed at the leading edge, and it is held down by a concrete press jack 12.

The tip of the concrete pouring pipe 9 is attached to the stop formwork 11.

In this state, fresh concrete mixed by the concrete mixer 8 is sent out by the pouring pump 7, and is pumped through the pouring pipe 9 to the assembled reinforcing bars.

The poured concrete is pressurized at a constant pressure by a concrete press jack 12.

After the concrete is placed in this way, the shield machine 1 extends the propulsion jack 2 and starts excavation.

The propulsion pressure at this time is received by the gripper 5 via the formwork 4.

During excavation, the stroke of the concrete press jack 12 is properly controlled to maintain the correct position of the formwork.

When this excavation work is completed, the concrete press jack 12 is retracted to remove the stop formwork 11 and reset to a new pouring position.

Subsequently, the fluid pressure in the cell 6 of the gripper 5 is relaxed, the gripper 5 is shifted, the formwork 4 at the rearmost end is removed, and the gripper 5 is set in a new position.

Thereafter, similar operations are repeated to excavate the tunnel.

As is clear from the above explanation, according to the present invention, the gripper has a structure in which it contacts the lining and the ground through a large number of cells that can expand and contract with fluid pressure to obtain reaction force, compared to the conventional gripper. It is lightweight and easy to move, and it adapts well to any surface condition of the lining and provides reliable reaction force without damaging the surface of the lining.

[Brief explanation of drawings]

The figure explains one embodiment of the present invention.
The figure is a cross-sectional view of the construction state, and Figure 2 is A-A of Figure 1.
FIG. 1... Shield machine, 2... Propulsion jack,
3...Tail part, 4...Formwork, 5...Gritzpa,
6... Cell, 7... Casting pump, 8... Mixer,
9... Casting pipe, 13... Cylindrical body, 14... Wheel, 1
5... Lining.

Claims (1)

[Claims] 1 Comprising a cylinder having a predetermined diameter, a plurality of cells arranged adjacent to the circumferential surface of the cylinder and expanded and contracted by fluid pressure, and wheels for movement provided on the cylinder. A gripper in a tunnel boring machine that is characterized by: