JPH0739994Y2 - Shield excavator drug mixing device - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention is a chemical mixture of a shield excavator in which a chemical such as a soil conditioner is mixed in a screw conveyor for soil discharge provided in a shield body. Regarding the device.

(Prior art) In the conventional earth pressure balance type shield excavator that excavates while injecting sewage into the face of the face and the tip of the shield body to prevent water spouting, the excavated earth and sand are put into the shield body together with the sewage. After it has been taken in, it is carried out to the rear by means of earth and sand, such as a screw conveyor, but because the earth and sand carried out is sludge, it is difficult to handle and transport, and it is difficult to obtain a place to dispose of it. There was a problem.

For this reason, conventionally, a sewage tank is installed on the ground near the starting shaft, and once stored in this sewage tank, a soil conditioner is added to solidify it for transport and disposal.

(Problems to be solved by the invention) However, in the above-mentioned conventional method, since a place for installing a wastewater tank is required near the starting shaft, it is difficult to construct if a place cannot be secured, and the soil improvement agent is injected. However, there was a problem that it required a machine and human power to do so and could not save labor.

In addition, since the earth and sand excavated and discharged by the soil discharge screw conveyor cannot be carried out by piled up on a transport vehicle such as a truck or a belt conveyor, the transport efficiency is poor, and there is also a problem that the transport means is limited. .

The present invention has been made for the purpose of improving the above problems, and provides a soil improvement agent mixing device for a shield excavator capable of mixing the soil improvement agent in a screw conveyor for earth removal installed in the shield body. Therefore, it is intended to facilitate the handling of excavated earth and sand.

(Means and Actions for Solving the Problem) In order to achieve the above object, the present invention shields earth and sand excavated by a cutter head rotatably provided in a front portion of a shield body together with sewage by a screw conveyor for earth discharge. In the earth pressure balance type shield excavator that is taken into the main body and carried out to the rear, in the middle of the above-mentioned screw conveyor for soil discharge, the medicine injection input for injecting the medicine into the sludge-like earth and sand conveyed and the injection of the medicine A screw conveyor for chemical mixing that stirs the soil and sand and forcibly mixes the soil and the chemical is provided, and the sediment is already carried out when it is solidified at the stage when the soil is taken into the shield body. It is an object of the present invention to provide a facilitated chemical mixing device for a shield excavator.

(Embodiment) This invention will be described in detail with reference to an embodiment shown in the drawings.

In the figure, 1 is a shield main body of a soil pressure balance type shield excavator, in which a cutter head 2 is rotatably provided at the front part, and the earth and sand excavated by the cutter head 2 has an airtight wall at the front part of the shield main body 1. It is designed to be taken into the shield chamber 1b formed by dividing the chamber 1a.

The shield chamber 1b is filled with sewage mixed with bentonite, clay, etc. that has been pumped through a sludge pipe (not shown) to balance the earth pressure on the face of the face and the pressure in the shield chamber 1b. At the same time, the earth and sand taken into the shield chamber 1b is taken into the shield main body 1 from the inside of the shield chamber 1b by the screw conveyor 3 for earth discharge.

The soil discharging conveyor 3 has a structure in which a screw shaft 3b is provided in a cylindrical case 3a whose front end projects into the shield chamber 1b, and the rear end of the case 3a is closed by an end plate 3c. A drive motor 4 for driving the screw shaft 3b is attached to the plate 3c.

Further, a baffle plate 5 for preventing the progress of earth and sand along the screw shaft 3b is attached in the middle of the screw shaft 3b, and a drug mixing screw conveyor 6 is installed below the baffle plate 5. .

The above chemical is a soil improvement agent that solidifies the sludge that is mixed with sewage, and is injected into the case 3a through the chemical injection port 7 provided on the upper front end side of the case 3a. ing.

The earth and sand into which the medicine has been injected is blocked by the baffle plate 5, and is accommodated in the case 6a through a communication hole 6c opened at the upper part of the case 6a of the medicine mixing screw conveyor 6,
A screw shaft 6b provided in 6a is agitated to forcibly mix the chemicals into the soil and solidify the sludge-like soil.

The medicine mixing screw conveyor 6 has a shorter length than the soil discharging screw conveyor 3 and is provided with a drive motor 8 for rotating the screw shaft 6b at the rear end thereof. The drive motor 8 causes the screw shaft 3b to rotate. The screw shaft 6b provided in parallel with the screw shaft 3b is rotated, and at the same time, the screw shaft 3b is rotated.
As a result, the earth and sand transported in the case 3a are taken into the case 6a while being scraped off by the screw shaft 6b of the medicine mixing screw conveyor 6, so that the medicine and earth and sand can be efficiently mixed.

Further, the earth and sand taken into the case 6a is returned to the inside of the case 3a of the screw conveyor 3 for earth discharge after passing the baffle plate 5.

The screw shaft 3b behind the baffle plate 5 has a small screw pitch P in advance so that soil and sand are transported in a compacted state, which prevents the pressure in the shield chamber 1b from leaking, and the rear of the case 3b. The earth and sand reaching the end is discharged into the shield main body 1 through the discharge port 3d having the gate 9 that can be opened and closed, and is loaded onto a transportation vehicle such as a truck or a conveyor such as a belt conveyor, and then discharged to the rear. It has become.

Although the medicine mixing screw conveyor 6 is shorter than the soil discharging screw conveyor 3 in the above embodiment, the screw conveyors 3 and 6 are provided in two rows as shown in FIG.
Baffle plates 5 and 9 are installed in the middle of the screw shafts 3a and 6b,
These baffles 5 and 9 are used to mix the sand and the chemicals while changing the flow of the sand and sand as shown by the arrows to solidify the sand, and to the inside of the shield body 1 through the discharge port 6d opened at the lower surface of the rear end of the screw conveyor 6. The earth and sand may be discharged and carried out rearward by means of earth and sand conveying means (not shown). If the direction of the earth and sand is changed three times or more as in the above embodiment, the mixing effect of the medicines is further enhanced. It is economical because the injection amount of can be reduced.

(Effect of the Invention) As described in detail above, the present invention removes sludge-like earth and sand excavated by the cutter head 2 provided in the front part of the shield body 1 and taken into the shield chamber 1b of the shield body 1. , When taking in the shield main body 1 by the soil discharging screw conveyor 3, the chemicals are injected in the screw conveyor 3,
Further, since the medicine and the earth and sand are mixed by the medicine mixing screw conveyor 6, the earth and sand discharged into the shield main body 1 by the screw conveyor 3 are solidified and become easy to handle, which makes it easy to handle, such as a trolley transportation vehicle or a belt conveyor. Since it can be carried out to the rear by means such as transporting sludge, it can carry out sediment more efficiently than the conventional sludge can be carried out, and since the excavated tunnel is not polluted by sludge, the inside of the tunnel is clean. Can be kept

In addition, since it is not necessary to install a dirty water tank near the start shaft, it can be easily implemented even if the vicinity of the start shaft is small, and since it can be discarded as it is, problems such as trouble in the disposal site can be solved.

[Brief description of drawings]

FIG. 1 is a schematic sectional view showing an embodiment of the present invention, FIG. 2 is a sectional view taken along the line II-II of FIG. 1, and FIG. 3 is an explanatory view showing another embodiment. 1 …… Shield body, 2 …… Cutter head, 3 …… Earth removal screw, 3b …… Screw shaft, 5 …… Baffle plate, 6 …… Drug mixing screw conveyor, 6b …… Screw shaft, 9 ……
Baffle.

Claims (3)

[Scope of utility model registration request] 1. An earth pressure balance in which earth and sand excavated by a cutter head 2 rotatably provided in a front portion of a shield body 1 are taken into the shield body 1 together with sewage by an earth screw screw conveyor 3 and carried out rearward. In the type shield excavator, in the middle of the screw conveyor 3 for earth removal,
Chemical injection port 7 for injecting chemicals into the sludge-like soil that is transported
And a drug mixing device for a shield excavator, which is provided with a drug mixing screw conveyor for stirring the drug-injected earth and sand and forcibly mixing the earth and sand with the drug. 2. A baffle plate 5 for changing the moving direction of earth and sand in the middle of the screw shaft 3b of the screw conveyor 3 for discharging soil.
The drug mixing device according to claim 1, further comprising: 3. The medicine mixing apparatus according to claim 1, wherein the screw shaft 6b of the medicine mixing screw conveyor 6 is also provided with a baffle plate 9 to change the moving direction of the earth and sand a plurality of times.