JPS5826194A - Shield drilling machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a shield excavator, in which muddy water is added to excavated earth and sand discharged to the discharge side of a cutter face plate to form muddy water, the fluid is transported, and the discharge side is kept under a predetermined pressure. In a shield excavator equipped with a cutter chamber that stabilizes the face side by maintaining a At the same time, a peripheral cutter chamber is formed at the periphery to discharge excavated soil as muddy water with a higher concentration compared to the axial core, and a cutting face is formed at the periphery of the cutter face plate. Related to a shield excavator that prevents the inflow of earth and sand to the side ↓ and discharge side and stabilizes the face.

In the conventionally known technique of adding muddy water to the earth and sand in a cutter chamber formed on the discharge side of the cutter face plate and transporting the fluid, the cutter chamber is formed as a single chamber on the discharge side of the cutter face plate. Since muddy water is added to dilute the sediment that forms and stays in the chamber, the muddy water in all the rooms has the same concentration, and it is not possible to partially change this concentration.

For this reason, it becomes difficult for the earth and sand at the top of the face, which is the most important part for the stability of the face, to flow in through the slit in the cutter face plate or the gap between the cutter face plate and the shield frame, which may lead to collapse of the face and the ground. If an unexpected obstacle is found underground during excavation of the face, remove most or all of the muddy water and earth and sand from the cutter chamber, close all the earth and sand intake slits on the cutter face plate, and close the cutter chamber. However, with large-diameter excavators, it takes a lot of time and work to remove the muddy water and dirt, resulting in loss of time and money. The present invention was devised to effectively solve the above-mentioned problems of the conventional 71P excavator, and its purpose is to add muddy water to the excavated earth and sand taken into the cutter chamber. In a shield excavator that discharges muddy water, the cutter chamber is divided into two chambers, a shaft center cutter chamber and a peripheral edge cutter chamber, and the muddy concentration of earth and sand in each chamber is adjusted to suit fluid transport and stable maintenance of the face. An object of the present invention is to provide a shield excavator that can be adjusted.

An embodiment of the present invention will be described in detail below based on the accompanying drawings. As shown in FIG. 1, a cutter face plate 2 is provided on the face side of the shield frame 1.

A cutter pit 3 is fixedly installed on the face side of the cutter face plate 2, and a cutter slit (not shown) for taking in excavated earth and sand is provided so as to take in the excavated earth and sand to the discharge side at the back. There is. On the discharge side of the cutter face plate 2, a ring girder 4 is fixedly fixed in an annular manner along the inner peripheral surface of the shield frame 1 at predetermined intervals. A cutter chamber 6 is formed by dividing a predetermined space. A driving ring T is provided between the above-mentioned ring carrier 4 and the bulkhead 5. The drive ring 7 is an annular member having a flange portion 8 on the side of the cutter chamber 6 and a flange portion 9 on the other end and having an opening-shaped cross section concentric with the seven-fold frame 1 . A radial bearing 1G is provided between the drive ring 7 and the ring girder 4, and a seal member 11 is provided between the bulkhead 5. A thrust bearing 12 is provided between the flange portion 8 of the drive ring 7 and the ring girder 4, and a seal member 13 is provided on the outer periphery of the thrust bearing 12. A driven gear 14 is provided on the other flange portion 9 of the drive ring 7 to drive the cutter drive motor 1.
It is connected to a main drive gear 15 extending from 6. A portion of the radial bearing 10 described above extends along the flange portion 9, and the ring serves as a bearing in contact with the bearing 4, and a sealing member IT is provided on the outer periphery of the radial bearing 10. A cylindrical cutter chamber dividing member 1B is connected between the back part (discharge side) of the cutter face plate 2 and the flange part 8 of the drive ring, and divides the cutter chamber 6 in the radial direction. Peripheral cutter chamber 2
0 is partitioned. With the above-described configuration, the cutter face plate 2, the dividing member 18, and the drive ring 7 are integrated into an integral rotating body, and the main drive gear 15 is driven by the cutter drive motor 16.
, is rotatable via the driven gear 14, the face is excavated by the Cantervit 3, and the excavated soil is taken into the shaft core cutter chamber 19 and the peripheral edge cutter chamber 20 through the slit.

This earth and sand is sealed in each cutter chamber 19, 20 by a seal member 11 provided between the bearing ring 7 and the bulkhead 5 and a seal member 13 provided between the drive ring 7 flange portion 8 and the ring girder 4. state. Shaft center cutter chamber 1
At 9, a mud water pipe 21 and a mud discharge pipe 22- extending from a mud water treatment facility (not shown) installed on the ground are connected to each other through the bulkhead 5. Peripheral cutter chamber 20
A mud water pipe 23 extends from the mud water treatment equipment to the upper side of the shield frame 1 and is connected to the ring girder 4, and a screw conveyor 24 for mud removal passes through the ring girder 4 to the lower side. It extends toward the rear of the shield frame 1.

The screw conveyor 24 is equipped with a motor M that rotates a built-in auger 25, and a soil discharge port 26 opened at the rear has a soil discharge adjustment tank 27 for transporting soil fluid that also serves as a gravel separator.
is connected. The waste soil adjustment tank 27 is provided with a screen 28 for separating large-diameter gravel unsuitable for fluid transport, and a mud water pipe 30 extending from the ground mud water treatment equipment.
and a drainage pipe 31 are connected. The bulkhead 5 is provided with a watertight manhole 35 for access to and from the shaft core cutter chamber 19. 32 is a ring-shaped member protruding from the face side of the cutter face plate 2.

The operation of the present invention having the above configuration will be described. 1st
As shown in the figure, when the shield excavator including the shield frame 1t is advanced in the excavation direction by the shield jack 34 while taking a reaction force to the stretched segments 33, the cutter face plate 2 comes into contact with the face of the ground. Therefore, the cutter drive motor 16 is driven and its driving force is transmitted by the gears 14 and 15 to the drive ring 7, which is a rotating body, and the dividing member 18.
By transmitting this to the cutter face plate 2 and causing a rotational movement, the cutter pit 3 excavates the entire face, and the excavated soil is transferred from the slit to the discharge side of the cutter face plate 2 into the shaft center cutter chamber 19 and the periphery, which are divided into two parts. and the cutter chamber 20, respectively.

The earth and sand in the shaft center cutter chamber 19 is mixed with muddy water sent from the muddy water treatment equipment on the ground via the muddy water pipe 21, and the muddy water with a concentration suitable for fluid transport is sent to the muddy water treatment equipment through the drainage muddy water pipe 22. It will be done. The earth and sand in the peripheral cutter chamber 20 is mixed with mud water sent from the above-mentioned ground mud water treatment equipment through the mud water pipe 23 to an extent that increases the fluidity of the earth and sand, and is formed into a slurry-like (highly concentrated muddy water like sludge). The soil is transferred through the conveyor by the rotation of the auger 25 of the screw conveyor and transferred to the soil discharge adjustment tank 27 via the soil discharge port 26. Turn the earth and sand into a slurry in the peripheral cage chamber 20.
For c, the amount of mud water to be fed may be reduced, or mud water may be fed intermittently. Transfer of the large-diameter gravel contained in the earth and sand transferred to the earth removal adjustment tank 2γ is stopped by the screen 28, and the earth and sand, which has become a slurry, is transferred from the muddy water treatment equipment on the ground to the mud water pipe 30. It is mixed with the muddy water to be sent, diluted, turned into muddy water suitable for fluid transport, and sent to the muddy water treatment facility through the mud drain pipe 31. Screen 28VC Remaining gravel is removed as appropriate. Since the mud feeding water pipes 21, 23 and 30 described above are each provided independently, the shaft center cutter chamber 19
It is possible to appropriately supply the required amount or concentration of mud water to the peripheral edge cutter chamber 20 and soil discharge adjustment tank 27, respectively, and depending on the condition of the ground face, the viscosity of the earth and sand in the peripheral edge cutter chamber 20 can be increased. Imparting agent (highly concentrated bentonite solution, etc.)
It is also possible to measure the stability of the working face by mixing the cutting face with Highly concentrated muddy water (sludge-turned earth and sand) K
In addition to being more stable, the earth and sand excavated at the center of the face can be efficiently transported by the mud feeding water pipe 21 and mud draining water pipe 22 connected to the shaft core cutter chamber 19. Note that if the muddy water in the peripheral edge cutter chamber 20 has a concentration that is sufficient to transport the muddy hydraulic fluid, and if it is not possible to stabilize the face with this muddy water, a mud drainage pipe may be used instead of the screw conveyor 23. May be used. In addition, as a means for taking large diameter gravel present in the face into the peripheral cutter chamber 20, it is sufficient to increase the opening degree of the cutter slit in this part, and in order to prevent it from being taken into the shaft center cutter chamber 19, The cutter slit in that part may be made smaller. In addition, in the event of an unexpected situation such as when an obstacle appears during the excavation of the face (1), the cutter hole 1 corresponding to the cutter chamber 1'9 of the shaft center portion is closed by a closing device (not shown). After removing muddy water and earth and sand from the cutter chamber 19 to make it a safe space, a worker can enter the cutter chamber 19 through a manhole 35 provided at Norkhet °5 and perform the required work. In this case, it is only necessary to remove muddy water and dirt from the cutter chamber 19, so it takes time and effort to remove it.
tt can be decreased.

Another use of this space (shaft core cutter chamber) is to effectively inject soil improvement chemicals from this space into the face when the soil quality of the face becomes unstable. can.

Further, as shown in FIG. 1, on the face side of the cutter face plate 2, a ring plate 32 is arranged in a ring shape at the same height as the cutter bit 3 on an extension line of the cylindrical cutter chamber dividing member 18 in the cutter chamber 6. This ring plate 32 penetrates the face and prevents muddy water of different concentrations flowing out from the shaft center cutter chamber 19 or the peripheral edge cutter chamber 20 to the face side from mixing into other cutter chambers. prevent. In the above embodiment, each of the mud feeding water pipes, mud draining water pipes, screw conveyors, etc. has been described as being one, but a plurality of them may be used as necessary.

As described above, the ICJ of the present invention provides the following excellent effects.

(1) Since the cutter chamber is divided into two chambers, one at the tube shaft core and the other at the periphery, the earth and sand taken into each chamber is diluted in the shaft core to be suitable for fluid transport and turned into muddy water at a normal concentration. In some areas, highly concentrated mud (sludge) is effective for stabilizing the face.
As a result, it is possible to prevent the force from the face side and the inflow of earth and sand, allowing safe tunnel excavation.

(2) The earth pressure applied to the cutter face plate during excavation and the reaction force when the excavator moves forward can be transmitted to the bearing part without strain in terms of strength by the cylindrical cutter chamber dividing member connected to the cutter face plate. The strength required for the cutter structure of large-diameter excavators can be ensured.

(3) When an obstacle appears during face excavation and confirmation processing is required, the cutter chamber is divided into two parts, so it is necessary to remove muddy water and earth from only one of the chambers, the shaft core cutter chamber. For example, since the worker can enter and exit the room, the time and amount of work required to remove muddy water and dirt can be reduced compared to the conventional method.

FIG. 1 is a side sectional view showing one embodiment of the present invention, and FIG. 2 is a sectional view taken along the line ■--■ in FIG.

In the figure, 1 is the shield frame, 2 is the cutter face plate, GFi
A cutter chamber, 18 is a cutter chamber dividing member, 1.9 is a shaft center cutter chamber, and 2o is a peripheral edge cutter chamber.

Patent applicant: Ishikawajima-Harima Heavy Industries Co., Ltd. Agent Patent attorney: Nobuo Kinutani

Claims (1)

[Claims] In a shield excavator equipped with a cutter chamber on the discharge side of the cutter face plate, which takes in excavated earth and sand, turns it into muddy water, transports it as a fluid, and maintains the discharge side at a predetermined pressure to stabilize the face side. is divided into a shaft core part and a peripheral part in the radial direction, and a shaft core cutter chamber is formed in the shaft core part to discharge the excavated earth and sand in the form of muddy water, and the peripheral part has a cutter chamber that discharges the excavated earth and sand in the form of slurry. Shield excavator 0 because it is characterized by forming a peripheral cutter chamber that discharges as highly concentrated muddy water.