JPS62178698A - Shielding excavator - 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 Industrial Application The present invention relates to a shield excavator for excavating and covering a tunnel with a cocoon-shaped cross section. When excavating and covering a subway tunnel, a tunnel 51 with a large diameter that includes the entire 2 medium line segment is excavated as shown in Fig. 3, or a tunnel 52 with a small diameter is excavated as shown in Fig. 4. Two holes were being excavated in parallel. By the way, in the title of the song, there is a disadvantage that as the diameter of the tunnel becomes larger, the face becomes easier to collapse, the excavation itself becomes more difficult, and moreover, there is a lot of empty space inside the tunnel. In this case, two shields! The disadvantages of hats include increased running costs and longer construction periods because they require a new machine. As a way to overcome these shortcomings,
It is conceivable to make the cross-sectional shape of the tunnel into a cocoon-like shape, such as by arranging two cylindrical cylinders on the left and right, so that their opposing sides overlap with each other with a predetermined width. As a shield excavator that excavates in shapes,
As shown in FIG. 5, the cross-sectional shape of the shield body 53 is made into a cocoon shape, and the face plate 55 of the cutter head 54 provided at the front part of the shield body 53 is shaped into a spoke shape so as not to interfere with the shield body 53. The need arises.

The problem that Kitamon is trying to solve As mentioned above, if the face plate of the canterhead is spoke-shaped, there is a problem that it cannot sufficiently support the face if the ground is soft and highly collapsible. Ta.

Therefore, the present invention aims to solve the above problems and provide a blue shield excavator.

Lower stage for solving the problem In order to solve the above problem, the shield tunneling machine of the present invention has the following steps:
Two cylindrical shield main bodies are connected in parallel with each other and their opposing sides partially overlap to form a shield main body with a cocoon-shaped cross section, and at the front ends of both shield main bodies. The rotary axis of the cutter head, which is installed so that it can rotate freely, is the same as the face plate! In addition to intersecting each other in the same horizontal plane so as to face outward, each face plate is formed into a circle with a size that does not interfere with each other.
- A moving cutter is installed to excavate the lower gap.

Operation At the above +lη configuration 63, if each cutter head and the mobile cutter are set to f11 and the shield body is advanced, a tunnel having a cocoon-shaped cross section is excavated.

According to this configuration, the cutter head is arranged at the front end of each shield body so as to face outward, so the face plate of the cutter head can be made circular, so even if the other mountain is on soft ground with high collapsibility, the face can be easily removed. It has sufficient support, and the double-force vine heads are arranged symmetrically on both sides, making digging stable and providing excellent directionality.

EXAMPLE Hereinafter, an example of the present invention will be described based on the drawings. 1st
In the figure and FIG. 2, 1 is 2fl! The cylindrical shield main bodies 2 and 3 of I are arranged in left and right parallel to each other, and a portion of the opposite side parts are ff! It is a shield main body with a cocoon-shaped cross section that is connected as seen.

That is, if the radius of each cylindrical shield body 2.3 is R, and the distance between the centers of both shield bodies 2, 3 is L,
R and L are selected to satisfy the relationship R<1<2H. Reference numerals 4 and 5 designate cutter heads rotatably installed at the front ends of the shield main bodies 2 and 3, respectively, and each face plate 6.7 is circular and faces outward. That is, each shield body part 2, 3
In the vicinity of the front end, partition walls 8 and 9 for forming pressure chambers are provided so as to face outward and laterally, and a rotary shaft body 10 is provided protruding from the rear of the face plates 6 and 7 of each cutter head 4.5. , 11 is
It is held via a bearing 39 in a holding cylinder 1, 1.15 which is arranged in a support cylinder 12°13 which is attached to the partition walls 8, 9 so as to be movable in layers in the axial direction thereof, and is further rotated in both directions. Shaft body 10.
The rotation axes of 11 intersect with each other in the same horizontal plane (for example, 1
It is arranged so that it hangs (20° culm degree). Furthermore, each of the face plates 6 and 7 is shaped into a circle with a diameter that is small enough to avoid interference with the surface. Multiple articles (e.g. 8
Slit l-1 (i, 17 is formed radially and there are many cutter bits on the edge of the slot ξ, only a part of which is shown in the figure) 18 is provided.

Further, a pressure chamber 19 is provided between the face plates 6, 7 and the partition walls 8, 9.
．． 20 will be formed. 21.22 is a motor for rotating the cutter head 4.5, and supports brackets l-23゜24 protruding from each holding cylinder i4.15.
At the same time, each of the horn shafts 21a, 22a
The binions 25.2+3 attached to each rotary shaft body 10
．． Reference numeral 29.30 meshed with the ring gear 27.28 attached to the rear end of 11 is a first cylinder device for moving the cutter head 4.5, that is, the face plate 6.7, forward and backward in the longitudinal direction of its axis of rotation. For example, one pair each is provided between the holding cylinders 8 and 9 and the holding cylinders 14 and 15. Reference numerals 31 and 32 designate a pair of left and right movable cutters for excavating the triangular gap between the upper and lower portions of the double-sided plates 6 and 7, which are arranged so as to be movable in the front and back directions within the front ends of the shield bodies 2 and 3, respectively. It consists of a pair of left and right cutter bodies 33 and 34 in a triangular shape, and a second cylinder device 35 that moves in and out of these J-shaped cutter bodies 33 and 34. Further, on the upper edge of the upper side joint cutter main body 33 and the lower edge of the lower measuring cutter main body 34, a multi-tipped sawtooth bit 36 is provided.
are provided for each. J3, h not shown
(A water pipe and a mud pipe are connected to each of the partition walls 8.9.

Further, 37 is a shield jack, and 38 is a bar 1 cal segment pushing diagonal λ-.

When J3 is in the above 4M configuration and a tunnel with a cocoon-shaped cross section is to be excavated, the cutter heads 4 and 5 are rotated by the respective motors 21 and 22, and the movable cutters 31 and 32 are moved in and out to excavate the tunnel. J, yes. At this time, slurry from a water pipe (not shown) is injected into each pressure chamber 19.20 to support the face 1.1+, and
The excavated earth and sand is discharged from the q mud pipe (not shown).

When performing half-way excavation, the predetermined cutter head 4 may be projected as shown by the imaginary line in FIG. 1 and excavation may be performed.

5. Effect of Ming According to the configuration of the Mokubei Gate mentioned above, it is possible to excavate a tunnel with a cocoon-shaped cross section, so the overall tunnel width is narrower than when two circular tunnels are excavated, making it easier to secure land, for example. It becomes right-handed at the point, then turns again, and the number of drilling pieces decreases, making it right-handed even for FL bay fish. In addition, since the cutter head 4 is placed at the front end of each shield main body so as to face outward, the face plate of the cutter head is circular, so it has a spoke-like shape like the conventional one, and the ground is InJI.
Even in soft ground with high A property, the face can be sufficiently supported, and since the double-strength digging head is arranged symmetrically to the /i right, excavation is stable and has excellent directionality. Furthermore, since a movable cutter is placed in the triangular gap between the upper and lower parts of the two power digging heads, it is possible to excavate a tunnel in the form of a cocoon.

[Brief explanation of drawings]

Figures 1 and 2 show an embodiment of the present invention. Figure 1 is a horizontal sectional view, Figure 2 is a view taken in the direction of the 1=■ arrow in Figure 1, and Figures 3 to 5 are This shows a conventional example, and Figures 3 and 4
The figure is a sectional view of the tunnel, and FIG. 5 is a front view of the cocoon-shaped shield tunneling machine. DESCRIPTION OF SYMBOLS 1... Shield main body, 2, 3... Cylindrical shield main body part, 4.5... Cutter head, 6, 7... Face plate,
8゜9...Partition wall, 10.11...Rotating shaft body, 12.
13... Support cylinder, 14, 15... Holding cylinder, 19.2
0...pressure chamber, 21.22...[-ta, 23.24
...Support bracket 1~. 31.32...Movable cutter, 33.34...Cutter body, 35...Second cylinder device, Agent: Morimoto ZanhiroFigure 2

Claims (1)

[Claims] 1 or 2 cylindrical shield main bodies are connected in parallel with each other so that their opposing sides partially overlap to form a shield main body with a cocoon-shaped cross section, and the shield main body rotates at the front end of both shield main bodies. The rotational axes of the freely provided cutter heads are made to intersect in the same horizontal plane so that the respective face plates face each other outward, and each face plate is formed into a circular shape large enough not to interfere with each other, so that the above-mentioned double-sided plates face each other. A shield excavator characterized by being equipped with a movable cutter that excavates the upper and lower gaps between edges.