JPH0634470Y2 - Shield machine blocking device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a device for releasing the blockage in the slit of the cutter head of an earth pressure system shield machine or in the earth pressure chamber.

<Prior art> As a support mechanism of the earth pressure type shield machine tip cutter head, a center shaft support mechanism in which a rotation shaft for transmitting rotation is joined to the central portion of the back of the cutter head, and a tip cutter head are driven to rotate on the outer periphery A peripheral support mechanism method is adopted in which it is joined to the body and the rotational force of the drive device is transmitted to the cutter head via the rotary drive body, but in recent years, with the demand for smaller diameter of the propulsion method, the ground including gravel In
In order to easily take in the gravel, it is necessary to increase the screw diameter, and a shield machine with a peripheral support mechanism that does not have a drive device in the central portion of the shield machine is increasingly used.

<Problems to be Solved by the Invention> In the above-described excavation by the shield excavator of the peripheral support mechanism, the excavated debris is taken into the earth pressure chamber from the slit by the rotary cutting of the tip cutter head. The gravel and gravel taken into the earth pressure chamber is plasticized and stored together with the mud material in the earth pressure chamber, and is carried out rearward by the screw conveyor while countering the earth pressure and water pressure of the face, and the pushing jack thrust force on the vertical shaft side. The shield machine is excavated by. But,
Depending on the soil condition and the speed of excavation, due to excessive intake of face soil into the soil pressure chamber and over-compression due to jack thrust, the excavated soil does not plastically fluidize and solidifies in the soil pressure chamber or inside the slit, causing a blockage phenomenon, It often happens that the head torque increases and the propulsion force increases, which causes the cutter head to stop rotating and the propulsion pipe material to be damaged, making it impossible to perform propulsion. As a method of releasing the blockage in the earth pressure chamber and slit, excavate the shield excavator part from the ground, remove the solidified sand in the slit of the cutter head and the earth pressure chamber, and start the shield excavator again. Although the method is adopted, it is the present situation that enormous cost and construction period are required for excavating the shield machine part.

<Means for Solving Problems> In order to solve the problems of the prior art, the present invention has a cylindrical casing provided penetrating a partition wall so that the tip is located in the earth pressure chamber. A screw blade with a shaft is rotatably installed, a nozzle for injecting pressure water is installed at the center shaft tip in any direction, and an injection hole communicating with the nozzle and passing pressure water is formed in the center shaft. The blockage prevention device is characterized in that the screw blade is rotationally driven through a rotary ring fixed to the outer periphery of the rear end of the screw blade.

<Operation> During excavation of the earth pressure system shield machine, if the excavated earth and sand solidify in the earth pressure chamber or in the slit to cause a blockage phenomenon and increase the cutter head torque or propulsion force, By the operation of the equipped pressure pump, the pressure water passes through the injection hole in the center shaft and is jetted from the tip nord. At this time,
The center shaft is given the rotational force of the drive device by a rotating ring fixed to the outer periphery of the rear end of the screw blade, and the nozzle also rotates around the center shaft while injecting pressure water all around the earth pressure chamber. Therefore, it became possible to release the soil and sand that were solidified and blocked in the soil pressure chamber or the slit by the action of pressure water injection.

<Embodiment> An embodiment according to the present invention will be described in detail with reference to FIG.

An earth pressure chamber 5 is formed at the tip of the shield machine 1 main body by a cutter head 2 and a partition wall 4 which are rotationally driven by a peripheral support mechanism. The tip of a tubular casing 6 having one end penetrating the partition wall 4 and the other end located at the rear atmospheric pressure is joined to the partition wall, and inside the casing 6, the center shaft is arranged so that the tip is located in the earth pressure chamber 5. A screw blade 8 having 7 is rotatably installed, and a nozzle 10 for injecting pressurized water is provided at the tip of the center shaft 7 in a direction substantially perpendicular to the center shaft 7. The direction of the nozzle 10 can be changed according to the shield machine diameter and the shape of the earth pressure chamber 5. Further, an injection hole 11 is formed in the center shaft 7 for communicating with the tip nozzle 10 and for passing pressurized water, and a swivel joint is provided at the rear end of the injection hole 11 in the center shaft 7.
A pressure water supply pipe 14 is connected via 13. Also,
A rotary ring 9 is fixed to the outer periphery of the rear end of the screw blade 8,
A drive unit 12 is linked to the rotary ring 9 via a pinion 15.

Now, the blockage releasing device having the above configuration will be described. The gravel and gravel is taken into the earth pressure chamber 5 through the slit 3 by the rotary cutting of the cutter head 2 at the tip of the earth pressure system shield machine 1 and is stirred and mixed in the earth pressure chamber 5 together with the mud material to be plasticized and fluidized and stored. It The accumulated gravel is gradually conveyed to the rear atmospheric pressure by the rotational drive of the screw blade 8 while countering the face earth pressure and water pressure, and the shield jack excavator is driven by the thrust of the vertical jack (not shown). 1
Is being dug up. However, the soil quality under normal ground is rarely the case with uniform soil conditions and often changes constantly. For this reason, when it becomes easy to take in the cutting face earth and sand due to changes in the soil quality, the earth and sand are excessively taken into the earth pressure chamber 5 and are over-compressed in the earth pressure chamber 5 and the slits 3 and consolidated. As a result, a blockage phenomenon occurs and an increase in the torque of the cutter head 2 and an increase in the propulsion force occur. Further, due to the soil or the sludge having a large adhesive force, the sand and sand are easily attached to the inside of the slit 3 and the earth pressure chamber 5, and the blockage phenomenon is caused as described above. At this time, the excavation of the shield machine 1 is suspended,
A pressure pump (not shown) mounted on the rear side is operated, and the pressure water is pressure-fed from the supply pipe 14 through the injection hole 11 in the center shaft 7 to the Nords 10 at the tip. The nozzle 10 swirls in the earth pressure chamber 5 together with the center shaft 7 as the screw blades 8 rotate, and blows off while blowing pressured water to the soil solidified in the slits 3 and the earth pressure chamber 5 to block it. To cancel. It is possible to release the blockage more easily by rotating the tip cutter head 2 at the same time as the screw blade 8 rotates.

<Effect of the device> In the earth pressure system shield excavator of the peripheral support mechanism type of the tip cutter head, there was no other way to cope with the blockage in the earth pressure chamber and the slit, only by excavating the shield machine part. , It was possible to release the blockage surely with a simple structure.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a blockage releasing device of an earth pressure type shield machine of the present invention. FIG. 2 is a front view of a tip cutter head of the shield machine of the present invention. FIG. 3 is a vertical cross-sectional view for explaining a closed state of a conventional earth pressure shield machine. FIG. 4 is a front view for explaining slit closing of the tip cutter head. In the figure, 1 is a shield machine. 2 is a cutter head. 3 is a slit. 4 is a partition wall. 5 is an earth pressure chamber.
6 is a cylindrical casing. 7 is a center shaft. 8 is a screw blade. 9 is a rotating ring. 12 is a drive device. 13 is a swivel joint. 14 is a supply pipe. 15 is a pinion. 16 shows the solidified sand.

Claims (1)

[Scope of utility model registration request] 1. A shield head is equipped with a cutter head by a peripheral support drive mechanism, and an earth pressure chamber is formed by a rear partition wall on the back of the cutter head, and excavated earth and sand are stored in the earth pressure chamber and filled with excavated earth. In an earth pressure system shield excavator that excavates while generating counter earth pressure against earth pressure and water pressure, a cylindrical casing having one end penetrating the partition wall and the other end located at the rear atmospheric pressure is provided. A screw blade having a center shaft is rotatably installed so that the tip is located inside the earth pressure chamber, and the center shaft tip is equipped with a nozzle for injecting pressure water in any direction.
Further, an injection hole is formed in the center shaft so as to communicate with the nozzle for passing pressured water, and the screw blade is rotationally driven through a rotary ring fixed to the outer periphery of the rear end. Release device.