JPS602303Y2 - Chemical injection device for shield tunneling machine - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a chemical liquid injection device for a shield tunneling machine that is designed to improve workability when injecting a chemical liquid from inside the shield tunneling machine to the crown ground in front of the shield.

Generally, when excavating soft soil with a shield excavator, a chemical solution such as water glass is injected into the soil in order to harden the top soil face or topsoil in front of the shield to prevent collapse and water gushing. It is known to do so.

By the way, there are two ways to inject chemicals into the crown ground in front of the shield: one is by polling from the ground, and the other is directly from inside the shield excavator, but this in-machine injection method is particularly useful when excavating deep strata. It is generally adopted because it can be carried out in relation to the geographical situation on the ground.

This in-machine chemical injection is performed by installing a chemical injection device inside the shield machine or in an excavation hole behind it, and inserting the chemical liquid injection nozzle into the ground through the shield frame of the shield machine.

However, in the past, the above-mentioned liquid injection device was not installed in a fixed location and had to be installed each time an injection operation was performed, which required a lot of work and time to perform the injection operation.

In particular, when installing a chemical injection device, the chemical injection nozzle must be placed across the inside of the shield excavator, so the screw conveyor installed inside the shield excavator gets in the way, and this must be carried out every time injection work is performed. This caused the problem of having to be removed, resulting in very poor workability.

The present invention has been devised to effectively solve the above-mentioned circumstances.

The purpose of this invention is to enable a chemical injection device for a shield tunneling machine that can easily carry out the injection work regardless of any structures that may obstruct the inside of the shield tunneling machine when injecting chemicals inside the machine, thereby improving work efficiency. is to provide.

A preferred embodiment of the present invention will be described below in detail with reference to the accompanying drawings.

In FIG. 1, reference numeral 1 denotes a shield excavator which is rotatably equipped with a cutter 3 rotatably driven by a motor M at the front end of a cylindrical shield frame 2. As shown in FIG.

The cutter 3 has a cutter chamber 4 formed in a hollow shape,
The cutter chamber is designed to take excavated earth and sand (hereinafter referred to as waste), and a screw conveyor 5 with one end facing the cutter chamber 4 is installed in the shield frame 2 along the axis of the screw conveyor 5. It is configured to carry out waste to the rear of the shield excavator 1.

On the other hand, in the shield frame 2, as shown in FIGS. 1 and 2, an erector 6 is provided via a pulley 7 so as to be rotatably driven along the circumferential direction.

This erector 6 is a ring-shaped rotating body, and is integrally provided with a segment assembly device 8 consisting of a hanging beam 8a for assembling segments S.

The shield excavator 1 configured as described above is provided with a chemical injection device 9.

This injection device 9 has a chemical liquid injection hole 10 and a chemical liquid injection nozzle 11.
It mainly consists of a chemical solution supply device 12 having a chemical solution supply device 12, and its related configuration will be explained next.

That is, the chemical liquid injection hole 10 is a guide hole through which the chemical liquid injection nozzle 11 is removably inserted and guided to the outside of the shield excavator 1. As shown in an enlarged view in FIG. A cylindrical body 1 is formed facing toward the front of the shield frame, and in the illustrated example, one end 14a is connected to a through hole 13 formed in the shield frame 2, and the other end 14b is supported with the other end 14b positioned near the erector.
The section is formed by 4.

The drug solution injection holes 10 configured in this manner are formed in two locations diagonally above the shield frame 2, as shown in FIG.

Of course, this embodiment is just an example, and the number of locations where the drug solution injection holes 10 are formed is not limited to two locations, and may be provided at appropriate locations over the entire circumference if necessary.

In addition, the chemical injection hole 10 has an inlet 10a at the inner end of the shield frame 2, and an outlet 10b at the through hole 13. In particular, in the embodiment, it is formed into a conical shape that gradually widens from the inlet 10a to the outlet 10b. It is.

Therefore, the tip of the chemical liquid injection nozzle 11 is swung as shown in FIG. 5 within the diameter range of the chemical liquid injection hole 10 formed in a conical shape, and the chemical liquid can be sprayed over a wide range. .

On the other hand, the chemical solution supply device 12 has a normal structure in which a pipe of a predetermined length constituting the chemical solution injection nozzle 11 is connected and the chemical solution is sequentially and continuously delivered to the chemical injection hole 10 .

This chemical solution supply device 12 is provided on the erector 6 via a bracket 15, as shown in FIGS. 3 and 4.
The chemical liquid injection nozzle 11 is supported by a bracket 15 so as to be tiltable and rotatable so that it can be swung.

In particular, the chemical solution supply device 12 is set so that the outlet 12a through which the chemical solution injection nozzle 11 is sent out faces the inlet lea of the chemical solution injection hole 10.

Note that reference numeral 16 in FIGS. 1 and 2 indicates propulsion shield jacks provided within the shield frame 2 at appropriate intervals along its circumferential direction.

Next, the operation of the above embodiment will be described.

The device of the present invention is used to improve the ground in order to prevent collapse of the front top of the shield when excavating soft soil.

In this operation, first, by rotating the erector 6, the chemical solution supply device 12 is set so that its delivery port 12a is located at the inlet 10a of the chemical solution injection hole 10.

When the setting is completed, the chemical liquid supply device 12 is activated, and the chemical liquid injection nozzles 11 are sequentially and continuously fed out and inserted into the chemical liquid injection hole 10, and the outlet 10
From b, the chemical liquid injection nozzle 11 is placed in the soil outside the shield excavator 1.
Insert the tip of the

When the injection nozzle 11 is extended a predetermined length from the outlet 10b, the feeding or delivery operation of the chemical solution supply device 12 is stopped, and a chemical solution such as water glass is supplied to the injection nozzle 11.

Then, the chemical solution is injected into the soil from the tip of the injection nozzle 11, thereby solidifying the front top end of the shield.

In such injection work, the drug solution injection hole 10 is connected to the inlet 1.
Since it is formed in a widening shape from 0a to the outlet 10b, the tip of the chemical liquid injection nozzle 11 can be swung within the diameter range as shown in Fig. 5, thereby injecting the chemical liquid over a wide range. Then you can.

On the other hand, when the injection of the chemical solution is completed, the injection nozzle 11 is pulled back from the injection hole 10 and placed in the supply device 12, thereby completing the injection work.

Note that the outlet 10b of the chemical liquid injection hole 10 in the above embodiment
Needless to say, the container is provided with an opening/closing lid that closes the container except during injection work.

In summary, the present invention provides the following excellent effects.

(1) Since the chemical supply device is installed in the erector, which is a rotating body,
The chemical solution supply device does not interfere with excavation work and can be left in place, and the screw conveyor in the shield excavator does not interfere at all when performing the chemical injection work.

(2) Therefore, even if there is a structure such as a screw conveyor inside the shield tunneling machine that gets in the way when there is liquid in the machine, the injection work can be easily carried out regardless of the structure, improving work efficiency as much as possible. obtain.

(3) Since the structure is simple, it is easy to manufacture and can be easily adopted into existing shield excavators without changing the design.

[Brief explanation of the drawing]

The drawings show a preferred embodiment of the present invention; FIG. 1 is a longitudinal sectional view of a shield tunneling machine, FIG. 2 is a rear view of the shield tunneling machine, and FIG.
FIG. 3 is an enlarged vertical cross-sectional view of the main part of the chemical injection device, FIG. 4 is a cross-sectional view taken along the line IV--IV in FIG. 3, and FIG. 5 is a front view of the shield tunneling machine. In the figure, 1... Shield excavator, 2... Tooled frame, 6... Erecta, 11...
. . . Chemical liquid injection nozzle, 12 . . . Chemical liquid supply device.

Claims (1)

[Scope of utility model registration request] In a shield excavator equipped with an erector that rotates along the circumferential direction of the cylindrical shield frame, a chemical injection hole is formed in the vicinity of the erector of the shield frame, facing outward in the radial direction and in front of the shield frame. A chemical liquid injection device for a shield excavator, characterized in that the erector is provided with a chemical liquid supply device having a chemical liquid injection nozzle that can be detachably inserted into the chemical liquid injection hole.