JPS61229097A - Shield 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 Field of the Invention The present invention relates to improvements in shielding machines, particularly small machines.

(Prior Art) Conventional shield machines had an electric motor built directly into the main body of the machine, so there was a problem in that the main body of the machine became larger due to the installation of a speed reducer and the like.

(Problems to be Solved by the Invention) The present invention has been made in view of the above points, and its purpose is to enable miniaturization with a simple structure, and also to enable excavation using jet water. To provide a shield machine which has excellent excavation efficiency despite its small size and does not require equipment such as a pump for supplying jet water.

(Means for Solving the Problems) The present invention provides a cutting nozzle 3 on the front side of a cutter head 2 mounted on a machine body 1, and a drive shaft 4 for the cutter head.
A jet pipe 5 is arranged inside the cutter head 2 with the cutter head made hollow, and the tip of the jet pipe 5 is connected to the excavation nozzle 3, and the base end of the jet pipe 5 is connected to the jet supply pipe 6. A water pressure motor 9 is disposed inside the main body 1, and this water pressure motor 9 is used as a drive means for the cutter head 2.
The gist is a shield machine characterized in that the discharge pipe of the hydraulic motor 9 is formed as the jet supply pipe 6.

(Example) Hereinafter, the present invention will be explained in detail based on illustrated embodiments.

The shield machine A is formed by disposing a cutter head 2 on the front side of a machine body 1, as shown in FIG. . The drive means for the cutter head 2 is a hydraulic motor 9, which connects a pressure fluid supply motor (not shown) to a pressure fluid supply pipe 1.
1 to supply pressure fluid to the hydraulic motor 9 to drive the hydraulic motor 9. The pressure fluid supply motor is not built into the machine body 1, but is placed on the starting shaft B or on the ground.

The cutter head drive shaft 4 is formed hollow, and a jet pipe 5 is disposed within the drive shaft 4. cutter head 2
A drilling nozzle 3 is formed on the front surface of the cutter head 2, and a jet path 10 is formed in the cutter head 2.
The tip of the jet tube 5 is connected to. On the other hand, the base end of the jet pipe 5 is connected to a jet supply pipe 6, and this jet supply pipe 6 also serves as a drain pipe for the hydraulic motor 9. Fig. 2 is an enlarged half cross-section of part A in Fig. 1. As shown in the figure, a jet water introduction chamber 13 having an annular jet water introduction passage 12 is formed along the inner circumferential wall of the drive shaft 4. The jet pipe 5 is led out from the jet water introduction chamber 15. Further, a jet water introduction hole 17 is formed in the outer peripheral wall of the jet water introduction port 13, and the jet water introduction hole 17 communicates with the jet supply pipe 6 through a so-called swivel structure. That is, the outer cylinder 20 is loosely fitted to the drive shaft 4 so that the drive shaft 4 can rotate freely, and the jet water supply hole 21 is formed in the outer cylinder 20 so as to correspond to the jet water introduction hole 17, respectively. It is formed.

23 is a packing, and 24 is a bearing. Therefore, the discharged water discharged from the hydraulic motor 9 becomes jet water J, passes through the jet water introduction path 12 and the jet pipe 5 from the jet supply pipe 6, and is injected from the excavation nozzle 3 toward the stratum G.

Incidentally, the excavated earth and sand are recovered from the vacuum 26 of the mud drain pipe 8 together with the jet water.

FIG. 3 shows an overall diagram of the excavation operation of the shield machine A. The shield machine A is set on the starting shaft B, and the press-fitting jack 27 is used to press the fume pipe 28 and the shield machine A to excavate and propel the machine. It is.

(Effects) As described above, in the present invention, a water pressure motor is disposed inside the machine body and this water pressure motor is used as a drive means for the cutter head. The internal drive means is only a water pressure motor, and there is no need for a speed reducer, resulting in a simple structure and miniaturization.

In addition, a cutting nozzle is installed on the front of the cutter head attached to the machine body, the drive shaft for the cutter head is made hollow, and a jet pipe is arranged inside this canter head, and the tip of this jet pipe is connected to the drilling nozzle. Since the proximal end of the jet/double pipe is connected to the jet supply pipe, it is possible for the cutter head to work together with the jet water, resulting in improved excavation efficiency despite its small size. play.

Furthermore, since the discharge pipe of the water pressure motor is used as a jet supply pipe, the pressure discharged water of the water pressure motor can be used as jet water, and therefore a device such as a pump for supplying jet water is not required, resulting in a simple structure. In addition, since water is used as the driving fluid, it is possible to use the water on site, and there is no need for a cooler.Furthermore, unlike oil, the quality of the driving fluid does not change, making it possible to supply a stable driving fluid to the motor. . In addition, rust countermeasures when using a water pressure motor are as follows:
This problem can be solved by applying a coating to the flow path of the motor.

[Brief explanation of the drawing]

Figures 1 (a) and (b) are a side sectional view and a front view of the shield machine of the present invention, Figure 2 is an enlarged half sectional view of the part A in Figure 1, and Figure 3 is the excavation of the same. It is an operation explanatory diagram.

Claims (1)

[Claims] (1) A cutting nozzle is installed on the front of the cutter head attached to the machine body, the drive shaft for the cutter head is made hollow, a jet pipe is arranged inside this cutter head, and the tip of this jet pipe is connected to the drilling nozzle. At the same time, the base end of the jet pipe is connected to the jet supply pipe, and on the other hand, a water pressure motor is disposed within the machine body, this water pressure motor is used as a drive means for the cutter head, and the discharge pipe of the water pressure motor is configured as the jet supply pipe. A shield machine featuring: