JPS62178696A - 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 the Invention The present invention relates to a shield excavation mode for excavating a tunnel having a cocoon-shaped cross section.

2. Description of the Related Art Conventionally, when excavating a tunnel with a wide cross section, for example, a two-lane subway tunnel, as shown in FIG. As shown in Figure 4, two small-diameter tunnels 52 are installed in parallel.
I was doing some digging. By the way, in a curved tunnel, the diameter of the tunnel becomes smaller, the face is more likely to collapse, the cost of the excavator itself increases, and there is also a disadvantage that there is a lot of wasted space inside the tunnel. Since J3 required two shield tunneling machines, it had drawbacks such as increased running costs and a longer construction period. As a way to eliminate these drawbacks, it is conceivable to make the cross-sectional shape of the tunnel into a shape where two cylindrical tunnels are arranged on the left and right and the opposing sides overlap with a predetermined width, that is, a cocoon shape. . By the way, by printing a shield for excavating and covering a tunnel in a cocoon shape, the cross-sectional shape of the shield main body 53 is made into a cocoon shape, and the cutter head 54 provided at the front part of the shield tree (+53) is made into a cocoon shape. so as not to interfere with each other, the face plates 55 of
It becomes necessary to cover it like a spoke.

Problems that Kitamon is trying to solve As mentioned above, when the face plate of the cutter head is spoke-shaped, there is a problem that it cannot adequately support the face when the other mountain is on soft ground with high collapsibility. .

Here, the purpose of the tree defense is to provide a shield digging method that can solve the above problems.

Means for solving the problem In order to solve the above problem, the shield excavation method of the present invention is as follows.
Two cylindrical shield main bodies are connected in parallel with each other so that their opposing sides partially overlap to form a shield main body having a cocoon-shaped cross section, and a partition is provided in the front part of the shield main body, Left and right cutter heads are rotatably supported at the center of each shield main body of the partition wall, and the face plates of each cutter head are arranged in the same vertical plane,
Each of these face plates is formed into a circular shape with a size that does not overlap with each other, and an excavation 7-m is provided on the outer periphery of each of the face plates to excavate an annular space formed between the face plate and the outer peripheral surface of the shield main body. A rocking device is installed that protrudes from each of the cutter heads and swings each of the cutter heads within a predetermined angle range (C), and a retaining plate that can move in and out toward each annular space is provided in the lower half of the partition wall. At the same time, a screw conveyor-type earth removal device for carrying out excavated earth and sand is connected to the lower half of the partition wall.

Operation In the above configuration, when each cutter head is operated to move the shield body forward, a tunnel having a cocoon-shaped cross section is excavated. According to the above structure, the face plate of each cutter head rotatably provided at the front end of each shield body is made circular in size so as not to interfere with each other, so that a considerable part of the face can be supported. Since a pile retaining plate and a screw conveyor-type earth removal device are provided in the space, pile retaining can be performed even when the operation is stopped.

EXAMPLE Hereinafter, an example of the tree 11 light will be described based on the drawings. In Figures 1 and 2, 1 is constructed by connecting two cylindrical shield main bodies 2 and 3 to each other in parallel to the right and in such a way that their opposing sides are partially ff!I. The main body of the shield has a cocoon-shaped cross section.

That is, if the radius of each cylindrical shield main body part 2, 3 is [< and the distance between the centers of both shield main parts 2, 3 is L, then R and L satisfy the relationship R<L<2R. Selected. Reference numeral 4 denotes a partition wall for forming an earth and sand intake chamber, which is provided in the vicinity of the curved ends of both shield main body parts 2.3 and across both sides. Reference numerals 5 and 6 denote left and right cutter heads rotatably supported by the partition wall 4 at the center of each shield main body 2.3.

The face plates 7 and 8 of the cutter head 5.6 are arranged on the left side 1 in the same vertical plane position (same position in the front and back direction), and are configured in a circular shape with a size that does not intersect with each other. The face plates 7.8 each have a rotary shaft body 9 protruding from the rear surface.
．． 10 is held by being inserted into a holding cylinder 12.13 provided on the partition wall 4 and the support wall 11 behind it through a bearing (not shown). And each of the above face plates 7
, 8, an annular space 14, 15 formed between the outer circumferential surfaces of the face plates 7, 8 and the outer circumferential surfaces of the shield main bodies 2, 3.
A substantially trapezoidal excavation arm 16.17 for excavating
They are individually protruded. In addition, each excavation arm 16.17
A large number of cutter pits 18 are attached to both end edges of the cutter.
In addition, each face plate 7, 8 has a plurality of slits 1 for taking in soil.
9.20 are formed radially, and a number of cutter bits 21 (only some of which are shown in the figure) are attached to the edges thereof. 22 is a front wall disposed to close the lower half of the annular spaces 14 and 15; and the excavating arm 16.
17 with no support for rocking: J is provided at the rear end position of the sea urchin face plates 7 and 8. An earth and sand intake hole 23 is formed between the front wall 22 and the partition wall 4. 24 is holding IFi1
This drive morph is attached to the support wall 11 that supports the excavator 2.13, and allows the face plates 7, 8 and the excavating arm 16, 17 to rotate in conjunction with each other. Ring gears 25 and 26 that mesh with each other are fixed to the rear ends of each rotating shaft body 9 and 10, and a pinion 27 fixed to the output shaft of the motor 24 is attached to one ring. One item is matched to gear 26. In addition, the above motor 2
4, the pinion 27 and the ring gear 25.213 constitute a rocking device. The excavating arms 16, 17 are oscillated and rotated δ by the motor 24 between an upper position (solid line position in FIG. 2) and a lower position (phantom line position in FIG. 2). Of course, at this time, the face plates 7 and 8 also swing and rotate. Further, the swing angle of the excavating arm 113.17 is the same as that of both excavating arms 16.1.
7 is set in an angular range that allows movement through both annular spaces 14 and 15, and the mutual end shapes are made into the same shape and cut off to prevent interference.

J3, the support wall 11 is equipped with a rocker so that the above-mentioned 1st movement is carried out automatically. A pair of upper and lower limit switches (not shown) are arranged to determine the III range, and on the ring gear 25, 26 side opposite to this limit switch is a kicker (not shown) that operates the limit switch.
is installed. 28 is each annular space part 14.1 mentioned above.
Above 5? A cylinder device that is disposed at the r position and in a state in which multiple pieces (for example, four pieces) are arranged in the circumferential direction, and is supported by the bulkhead 1 and the shield main body 2.3. and a retaining plate 30 attached to the tip of the rod of this shilling device 29. Reference numeral 31 designates a screw conveyor-type earth removal device which is disposed between the lower half portions of each of the annular spaces 14 and 15, but in the circumferential direction, one piece (for example, five pieces) at a time. Earth and sand intake hole 32 whose front end is formed in the moebei 22
A cylindrical casing 33 connected to the earth and sand intake chamber 23 and having an earth and sand intake opening 33a formed therein, a screw blade 34 rotatably disposed within this cylindrical casing 33, and this screw blade 34. Motor 3 that rotates
It consists of 5. 3G is a J71' mud pipe connected to the earth and sand outlet 33b formed at the lower rear of the cylindrical casing 33 via the communication box 37, and 38 is a water pipe connected to the upper part of the partition wall 4.

, When excavating a tunnel with a cocoon-shaped cross-section in the configuration described in F, the motor 24 rotates the face plate 7.8 and the excavation arm 16.17 back and forth once as shown by the arrow (A) in FIG. All you have to do is dig. The above drilling arm 16
．． The earth and sand excavated by No. 17 is transferred to the earth and sand intake hole 3 in the lower half.
The earth and sand discharged from the soil removal device 31 through the IA mud pipe 36 and taken into the earth and sand intake chamber 23 through the slits 19 and 20 of the face plates 7 and 8 fall downward and are taken in. The soil enters the tilling device 31 through the opening 33a and is then used through the mud removal pipe 3G. Note that during excavation, water is constantly supplied into the earth and sand intake chamber 23 through the water pipe 38.

By the way, during excavation, the crest retaining plate 30 is retracted to the rear position (the imaginary line position in Figure 2), but the gap between the face plate 7°8 and the crest retaining plate 30 will be adjusted to adjust the amount of soil taken in. In addition, when the operation is stopped, the crest retaining plate 30 is projected to the front position where it becomes the face plate 7, 8 (solid line position in Fig. 2), and the crest retaining plate 30 is secured to the J hub. ,
Regarding the lower cliff part (Yo, screw blade 3 of engineer device 31
A similar fI function is achieved by 4.

Effects of Lighting According to the above-mentioned M4 structure of the tree R-light, it is possible to excavate a tunnel with a cross-sectional shape of a cylindrical shape, so the overall tunnel width is narrower than when two circular tunnels are excavated. It is advantageous in terms of security, and at the same time, the amount of excavation is reduced, which is advantageous in terms of economy. In addition, the face plate of each cutter head, which is rotatably provided at the front end of each shield main body, is circular in size so that it does not interfere with each other, so it can support a considerable portion of the face compared to conventional spoke-shaped ones. In the annular space around the outer periphery of the face plate, insert a thread fastener and a screw 1.
Since a conveyor-type soil removal device is installed, it is possible to carry out heaping even when the operation is stopped.

[Brief explanation of drawings]

Figures 1 and 2 do not show an embodiment of the wood 51 light.
Fig. 1 is a horizontal sectional view, Fig. 2 is a view taken along the I-I arrow in Fig. 1,
Figures 3 to 5 show conventional examples, so Figures 3 and 4
The figure is a sectional view of the tunnel, and FIG. 5 is a front view of the rectangular shield excavator. DESCRIPTION OF SYMBOLS 1... Shield main body, 2.3... Cylindrical shield main body part, 4... Partition wall, 5.6... Cutter head, 7,
8...face plate, 14.15...1. ? i-shaped space part, 1
6.17...Drilling arm, 22...671! u,
23... Sediment intake chamber, 24... Motor, 25° 2G
...Ring-): ~I, 27...Vini A, 28.
...111 '+'i: Equipment, 29...Cylinder loading, 30...Temporary pile retaining, 31...Earth removal amount, 32.
... Soil intake hole, 33 ... Cylindrical coushing, 34 ...
・Screw blade, agent Yoshihiro Moriki Figure 8 Figure 4 Figure S

Claims (1)

[Claims] One or two cylindrical shield main bodies are connected in parallel with each other so that their opposing sides partially overlap to form a shield main body having a cocoon-shaped cross section, and a partition wall is provided in the front part of the shield main body. The left and right cutter heads are rotatably supported at the center of each shield main body of the bulkhead, and the face plates of the cutter heads are arranged in the same vertical plane, and the face plates are sized so that they do not interfere with each other. A digging arm is provided on the outer periphery of each face plate to excavate the annular space formed between the face plate and the outer circumferential surface of the shield body, and each cutter head is moved within a predetermined angle range. A rocking device is provided in the upper half of the bulkhead, and a retaining plate that can move in and out toward each annular space is arranged in the upper half of the bulkhead, and a screw conveyor for transporting excavated soil is installed in the lower half of the bulkhead. A shield excavator characterized by being connected to a type earth removal device.