JPS60233293A - shield tunneling 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] Industrial applications The present invention relates to a shield tunneling machine.

Conventional structure and its problems - 1 - Conventionally, the cutter head of the Shield M Ichiki was not provided with only one type of cutter, and therefore, if the soil quality was not uniform (for example, soft, hard Y: , sea urchins), the disadvantage is that efficient excavation cannot be carried out.

OBJECTS OF THE INVENTION Therefore, it is an object of the present invention to solve the above-mentioned drawbacks and provide a shield tunneling machine of 15 mm.

Structure of the Invention In order to achieve the above object, the shield tunneling machine of the present invention has the following features:
A rotating shaft in the front-rear direction having a retaining part in the middle part is provided in the shield main body, and a first cutter head having a first cutter head i and an opening at a predetermined location is fixed to the front part of the rotary shaft. A rotary drive device is interlocked with the rear part of the JL, and when the second cutter bit is movable within the opening of the first cutter bit, the second cutter bit has a protrusion to which a second cutter bit is attached.
The boss portion of the cutter head is engaged with the engaging portion of the rotating shaft so as to be movable only in the axial direction, and the second cutter head is moved forward and backward relative to the first cutter head. It is an IC type equipped with a jacking device to move it.

Embodiment and Function An embodiment of the present invention will be described below with reference to FIGS. 1 to 3. Reference numeral 1 denotes a shield body of a mud water pressurized shield excavator, which is composed of a front body 2 and a rear body 3, and is first expanded and contracted by a telescoping mechanism (hydraulic cylinder) 4. Note that 2a is a rotation prevention frame that projects from the front body 2 into 1421143, and engages with a guide plate 3a provided on the rear body 3 side in the circumferential direction. 5 has a casing 6 and a pair of front and rear bearings 7, 7' in the center of the front body 2.
A first cutter head 9 having a number of first cutter bits (for example, disc bits) 8 is fixed to one part of the front part, and a rotating shaft is rotatably supported through the rear part of the first cutter head 9. Drive device (e.g. hydraulic) 1
0 are interlocked and connected, and a spline 11, which is an example of an engaging portion, is formed at an intermediate portion thereof, that is, between the first cutter head 9 and the casing 6. Furthermore, a 4-circular opening 9a-3- is formed in one portion of the first cutter head 9 at the 4wI location (at the isometric device). (K- means 1st Katsutahito 1-8
are arranged between these openings 9a, that is, in a cross shape when viewed from the front. The rotary shaft 5 is interlocked with the rotary drive device d10 by a large gear 12 on the rotary shaft 5 side and a vinyl member (not shown) on the rotary drive device 10 side that meshes with the large gear 12. Reference numeral 13 denotes a second cutter head from which a second cutter bit 1-, such as round type bits 1 to 14, of a scale different from the first cutter bit 8 described in 1- is removed, and the second cutter bit 14 is placed on the front side. Four fan-shaped protrusions 13a which are attached in large numbers and are located in each opening 9a of the first cutter head 9 and are movable in the front and rear directions; The rotation is transmitted by the spline, which is engaged (fitted externally) so as to be movable only in the axial direction of A. ) It is composed of a boss portion 13b and a connecting portion 13c that connects the boss portion 13b and each of the protruding portions 13a. Further, the second cutter head 13 is moved between the operating position of the second cutter bit 14 (temporary -4- focal line position in Fig. 1) and the first It is movable between an unused position (solid line position in Figure 1) which is located rearward from the cutter bit 8. That is, when the annular plate 17 is installed on the outer periphery of the boss portion 13b so as to only allow rotation via the bearing 16,
This annular plate 17 and the front body 2 side (for example, a support plate 18 of a rotating shaft casing) are connected by a slide seat 15. 19 is a protrusion 1 of the second cutter head 13.
3a Earth and sand scrapers protruding forward on both sides -1-
Of course, in the position of use,
The front end thereof is located at the rear of the front end of the second cutter bit 14.

Reference numeral 20 denotes third cutter bits 1 to (for example, 3 center bits) attached to the front end of the J2 rotary shaft 5, which are of a different type from the first and second cutter bits 8 and 14 described above. Also, since a water pressure chamber 21 is formed at the rear of the dual force vine head 9°13, a sealing inner cylinder 22 is provided protruding from the casing 6 side so as to cover the boss portion 13b. A sealing outer cylinder 23 that fits into the sealing inner cylinder 22 projects from behind the connecting portion 13c of the cutter head 13, and a sealing material 24 is installed between these inner and outer cylinders 22,23. A partition wall 26 is provided between the inner cylinder 22 and the front l512 to block the rear atmospheric pressure chamber 25 side. Reference numeral 27 denotes a mud feeding pipe for supplying muddy water into the water pressure chamber 21, with a distance of W! 261
It is opened into the water pressure chamber 21 by passing through the section. Reference numeral 28 denotes a slurry transport pipe for transporting the earth and sand taken into the water pressure chamber 21 to the outside of the mine, and is provided so as to pass through the lower part of the partition wall 26. Reference numerals 29 and 29' are grip devices numbered at multiple locations around the front body 2 and rear body 3, respectively. It is composed of a grip jack (hydraulic cylinder) 31 that allows the These grip devices 12
9. By using the telescopic jack 4 described in 29' and -, the shield main body 1, that is, the front +1i12 can be moved back and forth alternately with respect to the rear body 3 and the rear body 3 with respect to the front body 2 like an inchworm. can. For example, when moving the front trunk 2 forward, the grip main body 30 on the rear trunk 3 side should protrude into the ground and extend the telescopic jack 4; when moving the rear trunk 3 forward, the front trunk 2 The grip body 30 on the side may be protruded into the ground and the telescopic jack 4 may be retracted. 32 is a shield jack, and uses a higment 33 - (shield body 1
Used when moving forward.

Next, the effect will be explained.

For example, if the soil of the excavated ground is hard, the slide jack 15 is retracted to move the second cutter head 13 to a non-use position as shown by the solid line in FIG. 9 is rotated to perform excavation with the first cutter bit 8. If the soil at the site of excavation is soft, extend the slide jack 15 to advance the first cutter head 9 to the use position as shown by the imaginary line in FIG. J: The second cutter head 13 is rotated via the respline 11 to perform excavation with the second cutter pits 1 to 14. Note that when using the first or second cutter bits 8, 14,
The third cutter pit 1-20 is also used at the same time to assist the excavation by the first or second cutter pit 8.14. Then, the excavated earth and sand is scraped up by the scraper 19 provided in the second cutter head 13 and thrown into the water pressure chamber 21, where it is mixed with muddy water to form a slurry, and the slurry transport pipe 28 It is transported to a predetermined location via. In this way, the first and second cutter heads having different types of cutter pits can be selected and used at will, so even if the soil quality of the excavated ground changes, efficient excavation can be performed with a cutter pit suitable for the soil quality. be able to.

In addition, in the above description, a spline was explained as an engaging part of a rotating shaft, but of course, a key may also be used.

Effects of the Invention 112 According to the structure of the present invention, the first cutter head and the second cutter head can be used separately, so if different types of cutter pits are attached to each cutter head, the soil quality of the excavated ground can be adjusted. Even if the soil changes, a cutter pit suitable for the soil type can be selected immediately, and therefore efficient excavation can be performed at all times.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is an overall sectional view, FIG. 2 is a half front view, and FIG. 3 is a half sectional view taken along the line II in FIG. 1-8. . 1... Shield body, 2... Front torso, 3... Rear torso,
5... Rotating shaft, 8... First cutter pit, 9...
First cutter head, 9a... opening, 10... rotary drive device, 11... spline (engaging portion), 13...
・Second cutter head, 13a...protrusion, 13b...
・Boss part, 13c...Connecting part, 14...Second cutter pit, 15...Slide jack (jacket device) Agent Yoshihiro Morimoto9- Figure 3

Claims (1)

[Claims] 1. A rotating shaft in the front-rear direction having an engaging portion in the intermediate portion is provided in the shield main body, and a first cutter head having a first cutter pit and an opening at a predetermined location is fixed to the front portion of the rotary shaft. and a second cutter pit, which is interlocked with a rotary drive device at the rear thereof, is movable within the opening of the first cutter pit, and has a protrusion to which a second cutter pit is attached.
A jacking device is provided which engages the boss portion of the cutter head with the engaging portion of the rotating shaft so as to be movable only in the axial direction thereof, and moves the second cutter head in the front and back direction with respect to the first cutter head. Characteristic shield excavator.