JPH0835397A - Leading body in small diameter shield machine - Google Patents

Abstract

PURPOSE:To obtain strong torques of a screw and a cutter head, by fixing a movable swash plate eccentrically on the periphery of a screw sleeve, while fixing a rotor cylinder on the periphery of the screw sleeve by making the screw sleeve of a leading body as a driving axis. CONSTITUTION:By making the screw sleeve 3 of a leading body 1 as a driving axis, a rotor cylinder 6 composed by providing nemerous cylinders 6a in the ring form on the intermediate tube 4C of an outer tube 4 is supported. Then, a swash plate 7 to which the sleeve 3 penetrates a little eccentrically is provided, and the swash plate 7 is composed of a fixed swash plate 7a and a movable swash plate 7b. Then, a hydraulic pressure is delivered from a hydraulic pump to the cylinders 6a through an oil feed hole 5a, pistons 6b are projected in order and their tips are abutted to the surface of the swash plate 7b, and the swash plate 7b is rotated in a specific direction together with the sleeve 3 by the function of the generated component force. Consequently, since the driving mechanism of a cutter head 2 is provided, a strong torque can be obtained regardless of the length of the shield tunnel.

Description

Detailed Description of the Invention

[0001]

[Field of Industrial Application] This invention is buried underground.
Excavators for small-diameter shield propulsion method widely used in construction fields such as sewer pipes, gas pipe laying, undergrounding of electric wires, etc., especially rotary drive of cutter heads and screw sleeves installed in the front conductor To the point that was done by the hydraulic rotary motor provided in the leading conductor,
It has characteristics.

[0002]

2. Description of the Related Art For example, in the construction of sewer pipes in recent years, instead of the conventional excavation method of digging the surface of the ground and embedding a pipe from above, a small-diameter shield propulsion is performed by excavating underground. Construction methods have become mainstream.

It is known that this small-diameter shield construction method has great results in mitigating noise, vibration, traffic obstacles and the like that are associated with excavation work on roads and the like. In this case, as a small-diameter excavator, the starting pit and the reaching pit are dug down from the surface keeping a certain distance, a screw is built in the starting pit, and a cutter head is attached to the tip to rotate and propel the front conductor. A method of installing a device and sequentially connecting and propelling a fume tube having a predetermined diameter with a screw separately installed in accordance with the advance of the above-mentioned conductor is widely adopted.

It is also known to provide a function of correcting the direction of excavation in the above-mentioned conductor and a pinch valve function for controlling the flow rate of water stoppage or discharged soil by utilizing the connecting portion of the fume pipe.

[0005]

The drive of the cutter head of the leading conductor and the screw interlocking with the cutter head of the preceding conductor in the above-described conventional excavation device is performed by the electric or hydraulic motor installed in the starting shaft. Since it was carried out, not only the turning force of the cutter head and the intermediate screw, whose distance increases as the excavation progresses, is gradually attenuated and the excavation capacity is lowered, but this also contributes to the hole bending, which contributes to the excavation of the long hole. There is a common problem that is limited.

[0006]

SUMMARY OF THE INVENTION In view of the above circumstances, according to the present invention, a swash plate is fixedly mounted on the outer circumference of a screw sleeve incorporated in an outer pipe portion of the lead conductor for driving the lead conductor. By applying the principle of the axial type plunger pump typified by Jeanne pump, a large number of pistons are sequentially abutted against one surface of the swash plate so that the swash plate can rotate in a certain direction. A rotary motor (hereinafter referred to as "piston motor") is configured to drive a screw and a cutter head in the leading conductor via the screw sleeve, thereby solving the problem in the conventional excavator of this type.

That is, in a small-diameter shield excavator in which a propulsion device is installed in the starting pit and the shield pit is excavated by the front conductor toward the arrival pit on the other side, the screw sleeve of the front conductor is used as the drive shaft. A plurality of hydraulic cylinders are fixed to the outer circumference of the cylinder in a circular manner, and a swash plate is slightly eccentrically mounted and fixed at a position where the successively protruding piston tips collide with each other.

[0008]

According to the leading conductor of the excavating device of the present invention having the above-mentioned structure, since the driving mechanism for the cutter head including the screw is provided in the screw sleeve in the leading conductor, regardless of the length of the shield pit to be dug, It has a special effect of obtaining a strong screw (cutter head) rotation (driving) force.

Further, since the drive mechanism provided in the lead conductor is a piston motor, there are no inconveniences such as wear and damage of gears and infiltration of earth and sand into the inside of the lead conductor, which are seen in a general gear rotating structure. The structure of the body is simply finished and efficient excavation is ensured.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The mechanism of the present invention will be described in more detail below with reference to the implementation side shown in the drawings. FIG. 1 is a schematic view of a small-diameter shield propulsion method using the excavating device according to the present invention. The starting pit S and the reaching pit R, which are dug down at a depth, are dug down with a certain distance maintained, and a propulsion device F including a hydraulic jack or the like having a push plate P that can be moved back and forth is provided in the starting pit S in advance.

Then, in a state where the push plate P is retracted, after the leading conductor 1 described later is suspended at a predetermined position on the side of the starting pit S, the leading conductor 1 is driven while being driven by the propulsion device F. Then, when the excavation by the leading conductor is completed, the push plate P is retracted, the fume pipe H having a separate screw is suspended and added to continue the excavation, and by repeating such a process, the shield shaft Is passed through the reaching pit R on the other side, but this process / operation is the same as that of the previous small-diameter shield propulsion method.

The structure and specifications of the propulsion device F installed in the above-mentioned starting pit S and the fume pipe H, etc., each having a built-in screw are the same as those conventionally used in this type of shield propulsion method. Since it can be used, explanations of those details will be omitted,
Hereinafter, the leading conductor 1 driven mainly by the piston motor
Will be described.

FIG. 2 is a side sectional view showing a cross section of a main portion of the tip conductor 1 of the present invention. The tip conductor 1 has a cutter head 2 rotatably provided at the tip, A screw sleeve 3 which is located behind the cutter head 2 and fixedly incorporates a screw 3a is arranged.
By connecting and fixing the tip of the shaft 3b of a to the center of the back surface of the cutter head 2, the screw 3a and the cutter head 2 can be integrally rotated via a screw sleeve 3 rotated by a piston motor described later. It is the one.

Thus, the outer cylinder portion 4 of the leading conductor 1 is the front cylinder 4
a, a rear cylinder 4b and an intermediate cylinder 4c. The front and rear cylinders 4a, 4b and the screw sleeve 3 are rotatable with the screw sleeve 3 via a bearing (Be) or a bush (Bu). On the other hand, the intermediate cylinder 4c supports a rotor cylinder 6 fixed to the peripheral surface of the screw sleeve 3 and penetrating a large number of cylinders 6a at equal intervals in the axial direction.
The rear cylinder 4b is bored so that it can communicate with the pressure oil passage 5 whose upper half is an oil feed hole 5a and whose lower half is an oil drain hole 5b.

Next, an example of the piston motor will be described. The screw sleeve 3 has a swash plate portion 7 penetrating eccentrically, and the swash plate portion is fixed to the inner step portion 4d of the front cylinder 4a. A fixed swash plate 7a, and a movable swash plate 7b rotatably attached to the fixed swash plate 7a via thrust bearings 7c. Each of the cylinders 6a of the rotor cylinder 6 is attached to the surface of the movable swash plate 7b. The movable swash plate 7b is made to be rotatable in a fixed direction by the action of the component force by abutting the tip of the piston 6b which projects sequentially.

To explain this point in more detail, a plurality of cylinders 6a in the rotor cylinder 6 which communicate with each other through oil feed holes 5a from a hydraulic pump (not shown) installed outside or at the starting pit S are defined. Hydraulic pressure is supplied, and the corresponding piston 6b is sequentially projected so that its tip is movable swash plate 7b.
By abutting against the surface, the movable swash plate 7b rotates in a certain direction by the action of the component force generated at that time, and at the same time, the hydraulic pressure in the cylinder 6a that has moved downward is discharged from the oil drain hole 5b, and this portion is discharged. Since the piston 6b is pushed back, the movable swash plate 7b smoothly rotates with the screw sleeve 3.

Reference numeral 4e in the drawing denotes a concave spherical portion provided at the rear end of the rear outer cylinder 4b, which is in swingable contact with the spherical sleeve 8.
The direction of the screw sleeve 3 including the cutter head 2 can be adjusted at any time by operating the rocking cylinder 8a provided behind it.

[0018]

As is apparent from the above detailed description, according to the leading conductor of the excavating device of the present invention, since the driving mechanism for the cutter head including the screw sleeve is provided in the leading conductor, it is as before. Since it is not necessary to install a drive mechanism such as a cutter head inside the starting pit, not only can the space inside the pit be effectively used, but also a powerful screw and cutter head drive regardless of the length of the shield pit to be digged. The special effect of gaining power is obtained.

Further, the drive mechanism for the above-mentioned lead conductor can be manufactured in a simple and compact structure by adopting a piston motor, and at the same time wear and wear of parts and the like can be reduced.
Many benefits are brought about, for example, the labor for maintenance or repair can be omitted and running cost can be greatly reduced.

[Brief description of drawings]

FIG. 1 is a schematic view of a small-diameter shield propulsion method using the excavation device of the present invention,

FIG. 2 is a side sectional view showing a cross section of a main portion of a lead conductor of the device of the present invention;

3 is a cross-sectional view taken along the line AA in FIG.

4 is a sectional view taken along line BB in FIG.

5 is a sectional view taken along line CC in FIG.

[Explanation of symbols]

 1 Leader conductor 2 Cutter head 3 Screw sleeve 4 Outer cylinder part 5 Pressure oil passage 6 Rotor cylinder 7 Swash plate part 8 Spherical sleeve

Claims (1)

[Claims] 1. A small-diameter shield excavation in which a rotating and propulsion device for a leading conductor having a screw or the like built in a cutter head and a sleeve is installed in a starting pit and a shield pit is digging toward a reaching pit on the other side. In the apparatus, a screw cylinder of the above-mentioned conductor is used as a drive shaft, and a rotor cylinder formed by arranging a number of hydraulic cylinders around the outer circumference is fixed, while a movable swash plate is eccentrically fixed on the circumference of the screw sleeve. And a tip of the piston of the rotor cylinder that sequentially protrudes so as to come into contact with the tip end conductor in a small-diameter shield excavator.