JPH0415879B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a propulsion device that is applicable to not only open type but also closed type shield excavation machines that can excavate in a curved shape. .

[Conventional technology]

FIG. 6 is a longitudinal sectional side view of a conventional open shield tunneling machine. In the figure, 1 and 2 are a front body and a rear body formed by dividing the outer shell of the shield tunneling machine in the longitudinal direction, and both are connected in a flexible manner by a bending connection part 4 equipped with a seal member 3. There is. 5
is a bending jack that bends the front body 1 with respect to the rear body 2, and the tip of the piston rod 6 and the base end of the cylinder 7 are pinned to brackets 8 and 9 on the inner circumferences of the front body 1 and the rear body 2, respectively. It is pivotally connected by 10 and 11. Reference numeral 12 denotes a propulsion jack disposed on the inner periphery of the front shell 1 in parallel to the axis of the front shell 1. Its cylinder 13 is inserted through a jack guide 15 and its base end is fixed to a pressure receiving plate 16. Further, a pushing body 18 is connected to the tip of the piston rod 14 via a spherical joint 17, and the pushing body 18 pushes the tip end surface of the segment 20 to propel the front shell 1. In the figure, 21 is an excavator, and 22 is an erector device for assembling the segments 20.

In order to propel the front body 1 by the above-mentioned propulsion jack 12, the piston rod 14 of the propulsion jack 12 is extended by hydraulic operation, and the pushing body 18 presses the segment 20 and the tip end surface. Then, the propulsive force of the propulsion jack 12 will be transferred to the pressure receiving plate 16.
is transmitted to the front body 1 through the front body 1, and the front body 1 moves forward accompanied by the rear body 2.

[Problem that the invention seeks to solve]

In conventional shield tunneling machine propulsion devices, the propulsion jack was fixed to the front fuselage as described above.
When the propulsion jack 12 is extended as shown in FIG. 7a, the pressing body 18 interferes with the inner wall of the rear body 2 on the outside of the bend. Therefore, in order to avoid this interference, an elastic body is attached to the jack guide 15 of the front body 1.
There are 9. Moreover, as shown in FIG. 7b, the pressing body 18 separates from the inner wall of the rear body 2 on the inside of the bend, and cannot press the center of the segment 20. In any case, the axis of the propulsion jack 12 is eccentric and inclined relative to the segment 20.

Therefore, if the bending angle is increased beyond a certain level, the segments may be damaged. For this purpose, a structure in which the propulsion jack is fixed to the rear fuselage side has been proposed, but although the inclination between the propulsion jack and the segment is eliminated, the thrust of the propulsion jack must first be received by the rear fuselage, so the structure of the rear fuselage is is disadvantageous in terms of strength. Another problem was that the bending jack had to have a large capacity in order to transmit the force from the front body to the rear body through the bending jack.

Furthermore, even if a propulsion jack is arranged on the rear fuselage side so that the axes are parallel, and the front fuselage is also propelled by the propulsion jack, if the propulsion jack is bent while thrust is applied, the propulsion jack will Since interference occurs between the front body and the jack guide, it is not easy to bend the front body. In particular, in closed-type shield tunneling machines such as mud water pressurization type and closed mechanical type, unlike open-type shield tunneling machines such as hand-drilling type and semi-mechanical type, it is necessary to constantly maintain the force from the face with the propulsion jack. Therefore, there was a problem in applying it to a closed type shield excavator.

[Means for solving problems]

A propulsion device for a shield tunneling machine according to the present invention is a shield tunneling machine in which a front trunk and a rear trunk, which are divided into front and rear parts, are connected in a flexible manner via a sealing member. A propulsion jack is arranged in parallel with the jack, and the propulsion jack is slidably inserted into the jack guide, and a buffer material is interposed between the propulsion jack and the jack guide, and if the restoring force of the buffer material is insufficient, A positioning device is provided to correct the axis of the propulsion jack, and a pressing body that contacts the segment tip surface is connected to the tip of the piston rod of the propulsion jack via a spherical joint.
The base end of the cylinder of the propulsion jack is slidably abutted against a pressure receiving plate provided in the front body.

[Effect]

In the present invention, the propulsion jack is slidably supported parallel to the axis of the rear shell by the jack guide provided on the inner periphery of the rear shell. The shock absorbing material of the jack guide absorbs and softens the force that tends to tilt the slider. Further, by assembling the segments, the thrust of the propulsion jack is released, the restoring force of the buffer material acts, and the axis of the propulsion jack becomes parallel to the axis of the rear fuselage. Therefore, the segment can be pressed concentrically by the pressing body connected to the tip of the piston rod of the propulsion jack, and this pressing point can be used as the reaction force point of the propulsion jack. moreover,
Since the base end of the cylinder of the propulsion jack is provided so as to be slidably in contact with the pressure receiving plate on the front body side, a large propulsive force is not transmitted to the rear body.

〔Example〕

Hereinafter, a case where a positioning device is installed as an embodiment of the present invention will be explained with reference to the drawings.

Figures 1a and b are longitudinal sectional side views showing the propulsion jack before and after the position of the propulsion jack in this embodiment is corrected, Fig. 2 is a detailed view of the propulsion jack, and Fig. 3 is a front view along the line shown in Fig. 2. . Components that are the same as those shown in FIG. 6 are denoted by the same reference numerals, and explanations thereof will be omitted. In the figure, 25 is a jack guide disposed on the inner periphery of the rear body 2, and the cylinder 25 is moved so that the axis of the propulsion jack 26 is parallel to the axis of the rear body 2.
7 is slidably inserted and supported via a cushioning material 29. Piston rod 28 of propulsion jack 26
A pressing body 18 is connected to the distal end of the segment 20 via a spherical joint 17 as in FIG. 6, and the pressing body 18 concentrically presses the distal end surface of the segment 20. The proximal end of the propulsion jack 26 is in contact with a pressure receiving plate 16 formed on an arc and disposed on the inner periphery of the front body 1 . That is, the propulsion jack 26 has the body of the cylinder 27 slidably supported by the jack guide 25 and the buffer material 29 in the rear body 2, and the tip of the piston rod 28 between the segment 20 and the pressure receiving plate 16 on the front body 1 side. The pressing body 18 and the base end of the cylinder 27 are slidably brought into contact with each other. Reference numeral 30 denotes a positioning device for correcting the inclination of the axis of the propulsion jack 26, which is comprised of a gripping device as described below. The positioning device 30 is supported on the side surface of the jack guide 25.

As shown in FIG. 1a, when the front barrel 1 is bent while thrust is applied to the propulsion jack 26, the axis a of the base end of the cylinder 27 is caused by the frictional force with the pressure receiving plate 16, so that the axis a of the rear barrel Slightly inclined from the axis b of 2,
It begins to cause interference with the jacking guide 25. Therefore, after releasing the hydraulic pressure to the cylinder 27, the propulsion jack 26 is restored to its original position by the buffer material 29 made of an elastic member, and if the restoration is insufficient, the cylinder 27 is gripped by the positioning device 30. Then, as shown in Figure 1b, it is accurately returned to its original position. During this time, other propulsion jacks 2
6 will share.

2 and 3 show details of the propulsion jack positioning device. In particular, this example of the positioning device 30 shows a case where the propulsion jacks 26 are positioned one by one. The propulsion jacks 26 and the bending jacks 5 are arranged alternately and evenly on a jack guide 25 made of an annular plate. In the figure, 31 is the cylinder 27 of the propulsion jack 26.
A pair of arms grip the lever, and the intermediate portion thereof is pivotally supported on a mounting base 32 on the jack guide 25 by a pin 33. 34 is a hydraulic cylinder for gripping connected to the base end of the arm 31, and its piston rod 35
The distal end is connected to the base end of one arm 31 with a pin 36, and the base end of the cylinder 34 is connected to the other arm 31.
It is connected to the base end of the body by a pin 37.

Therefore, when the piston rod 35 of the hydraulic cylinder 34 is extended, the tips of the pair of arms 31 approach each other and can grip the body of the cylinder 27 of the propulsion jack 26. Since the pair of arms 31 is supported on the mounting base 32 at the normal position of the jack guide 25, the propulsion jack 26 held by the arms 31 has its axis a aligned with the axis b of the rear body 2. modified to match exactly.

Next, FIGS. 4 and 5 show another embodiment of the positioning device 30, in this case configured to position several propulsion jacks 26 together. That is, it consists of one arc-shaped grip plate 38 that is rotated by a hydraulic cylinder 34 along the side surface of the jack guide 25, and the other arc-shaped grip plate 38a that is similarly rotated by a hydraulic cylinder 34a. ing. The arcuate gripping plates 38, 38a have V-shaped notches 39, 39 for gripping the body of the cylinder 27 of the propulsion jack 26.
a are provided facing each other. Further, notches 40 and 40a are provided to form elongated holes so as not to interfere with the bending jack 5. In the diagram, 4
1 is a guide for the arcuate gripping plates 38, 38a.

〔Effect of the invention〕

As described above, according to the present invention, the propulsion jack is disposed parallel to the axis of the rear shell between the segment and the pressure receiving plate in the front shell, and the jack guide, through which the propulsion jack is slidably inserted, is arranged in the rear shell. Since it was installed on the inner circumference,
It is possible to restore the tilt of the propulsion jack's axis using only the cushioning material and keep it always parallel to the axis of the rear fuselage.Therefore, a concentric reaction force point is formed against the segment, which can damage the tip end surface of the segment. Without,
Further, it is possible to prevent a large force from being applied to the rear body from the front body side, and there is no need to increase the capacity of the bending jack. Further, since the front body can be bent even when thrust is applied to the propulsion jack, the propulsion device of the present invention can also be applied to a closed type shield excavator.

[Brief explanation of drawings]

Figures 1a and b are longitudinal sectional side views showing the position of the propulsion jack before and after the position correction according to the embodiment of the present invention, Fig. 2 is a detailed view of the propulsion jack, and Fig. 3 is Fig. 2-
4 is a side view showing an example of another positioning device for the propulsion jack; FIG. 5 is a front view taken along the line 4 - FIG. 6 is a vertical sectional side view of the entire conventional shield tunneling machine. , FIGS. 7a and 7b are longitudinal sectional side views showing the extension side and the contraction side of a conventional propulsion jack. 1: Front body, 2: Rear body, 3: Seal member, 16:
Pressure receiving plate, 17: Spherical joint, 18: Pressing body, 20:
segment, 25: jack guide, 26: propulsion jack, 27: cylinder, 28: piston rod, 29: buffer material, 30: positioning device.

Claims (1)

[Claims] 1. A shield excavator comprising a front body and a rear body which are divided into front and rear halves and which are connected in a flexible manner. The cylinder is slidably inserted and supported via a cushioning material, and includes a jack guide provided on the inner periphery of the rear body, and a pressing body connected to the tip of the piston rod of the propulsion jack. A propulsion device for a shield tunneling machine, characterized in that a base end is slidably abutted on a pressure receiving plate provided in the front shell.