JPH11294092A - Lining structure of variable cross-sectional shield - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure water stop performance by using a segment having a segment outer peripheral side shape formed in parallel to the taper part as a segment used in the taper part. SOLUTION: For example, in a circular arc-shaped segment, the width directional outer peripheral side is formed in a taper shape in both side surfaces 11z, 11z to prevent a step difference between rings in the segment outside surface. Or a width directional cross section is formed as a parallelogram to prevent a step difference between the segment inside/outside surfaces. Therefore, since the segment outside surface is formed in a taper shape, a tail seal plate 13a of a tail seal 13 is set by following the segment outer periphery. Since clearance between the segment outer periphery and bedrock is almost constant, the tail seal 13 can be arranged without requiring to lengthen and increase bristles of a seal brush 13b. Therefore, water stop performance can be easily improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a variable section shield lining structure in which a tapered section having a variable width is provided between a general section having a circular cross section and a wide section obtained by widening the cross section in the radial direction. In particular, the present invention relates to a lining structure of a tapered portion.

[0002]

2. Description of the Related Art Conventionally, in the case of excavating a tunnel having a widened portion in which an excavation cross section is widened in a general portion having a circular cross section, a portion of a shield body is excavated uniformly in a widening direction. , A so-called parallel expansion / contraction shield propulsion machine is used. When the widening width of the tunnel is large, there is a method of excavating the tunnel by providing a tapered portion in which the widening width gradually changes between the general portion and the widening portion. FIG. 16 is a diagram showing a lining state in a case where excavation is performed in a state where the left and right trunks are parallel to each other using the parallel expansion / contraction type shield propulsion device in the tapered portion. Here, in order to make the tunnel shape of the taper part as smooth as possible,
Each time the shield propulsion machine advances by the width of one segment 11, the shield body is gradually widened and excavated. As the segment 11 used in the lining of the variable section shield, a segment having a rectangular section 11z is used. A tail seal 13 is attached to the gap between the segment 11 and the excavated tunnel so as to prevent earth and sand and water from entering.

[0003]

However, since the shape of the cross section 11z of the segment 11 is rectangular, a step between the rings occurs on both the inside and the outside of the segment, and the tail seal 13 is formed by the step between the rings. There was a problem that it became impossible to follow, and water stop measures became difficult.

[0004] The present invention has been made in view of the conventional problems, and in a variable cross-section shield provided with a tapered portion,
It is an object of the present invention to provide a lining structure of a variable cross-section shield using a segment that can follow the shape of the tapered portion.

[0005]

According to a first aspect of the present invention, there is provided a lining structure for a variable cross-section shield, wherein the segment used for the tapered portion of the variable cross-section shield provided with the tapered portion has a shape on the outer peripheral side of the segment. Is characterized by using a segment formed so as to be parallel to the tapered portion.

The lining structure of the variable cross-section shield according to a second aspect of the present invention is characterized in that the cross-sectional shape of the segment in the width direction is a parallelogram.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a configuration of a shield machine 20 according to an embodiment of the present invention.
1A is an overall sectional view, and FIG. 1B is a front view. In the figure, 1 is a main cutter mounted on the front surface of a shield machine 20 for excavating a face, and 2 is a pair of main cutters mounted on the main cutter 1 and capable of expanding and contracting in the radial direction of the main cutter 1 (radial direction of the shield). Equipment of 3L, 3
R is a left and right widening cylinder having an arc-shaped cross section that moves left and right respectively, 4 is a disk-shaped partition wall arranged at the rear of the main cutter 1, 5A and 5B are a plurality of sub-cutters 5k on the front surface. And a flat horizontal frame extending parallel to the axial direction of the shield machine 20. Reference numeral 5A denotes an upper horizontal frame constituting an upper trunk, and 5B denotes a lower horizontal frame constituting a lower trunk. The horizontal frames 5A, 5B
Constitutes the shield body 3 together with the left and right widening cylinders 3L and 3R. Further, 6 is provided inside the middle body of the shield, and the horizontal frame 5 is provided together with the partition 4.
A column for supporting A and 5B, 7 is the horizontal frame 5A and 5
B, attached to the inside of the shield of B
A slide jack for moving L and 3R to the left and right respectively, 8 is a shaft portion of the main cutter 1, 9 is a driving device of the main cutter 1, and 10 is a shield propulsion for pushing the segment 11 to advance the shield excavator. A jack, 12 is an erector for assembling the segment 11 into a ring shape, and 13 is the segment 11 and the shield machine 2
This is a tail seal for stopping water installed between the tail seal. In the upper and lower horizontal frames 5A and 5B, a driving device 5m for the sub-cutter 5k is provided at the rear of the sub-cutter 5k.
Is stored. Further, in order to simplify the drawing, a mud pipe 14 for sending high-pressure muddy water in front of the partition wall 4 and a drainage for sending earth and sand excavated by the main cutter 1 and the above muddy water to the rear of the shield. The mud pipe 15 is indicated by a two-dot chain line.

FIG. 2A is a sectional view taken along the line AA in FIG. 1A. Three sub-cutters 5k are provided at both ends of each of the horizontal frames 5A and 5B. Among the sub-cutters, the center sub-cutter is located on the front side of the other sub-cutters (see FIG. 1B). Further, a mud pipe 14 is provided at the center of the front surface of the upper horizontal frame 5A.
The agitator 16 for stirring the excavated earth and sand and the muddy water from the mud port 14a and the mud port 15 of the mud pipe 15 are provided in the center of the front surface of the lower horizontal frame 5B.
a. One of the outlets 15a in the figure is a spare outlet. Also, the left and right widening cylinders 3L,
Moving portions 3p and 3q are provided on a portion corresponding to the back side of the partition 4 of the 3R so as to be in close contact with the partition 4 with a waterproof seal (not shown) interposed therebetween. FIG.
In the sectional view taken along the line BB of FIG.
It is composed of two parallel bar-like members which are vertically built between the horizontal frames 5A and 5B between 5B. The drive device 9 for the main cutter 1 is provided concentrically with the shield body 3 at left and right three each.
Numeral 0 is provided concentrically inside the shield body 3. Specifically, the horizontal frame 5 which is an upper trunk and a lower trunk
A, the shield propulsion jack arranged inside 5B,
The other shield propulsion jack, which is arranged at the rear of the driving device 5m of the sub cutter 5k, moves the left and right widening cylinders 3
It is arranged inside L, 3R. In FIG. 1B, the erector 12 attached to the column 6 is omitted.

Next, the operation of the shield machine 20 configured as described above will be described. The excavation of the cutting face is performed by rotating the main cutter 1 while feeding high-pressure muddy water from a mud feed port 14a of a mud feed pipe 14 provided on the upper horizontal frame 5A, and a segment assembled in a ring shape by the shield propulsion jack 10. Press 11 to move the shield machine 20 forward. At this time, excavation of a long hole extending in the upper and lower horizontal directions by the sub-cutter 5k provided in the upper and lower horizontal frames 5A and 5B is performed at the same time. Excavated earth and sand
The slurry is stirred together with the mud by the main cutter 1 and the agitator 16, and is sent from the mud outlet 15 a through the mud pipe 14 to a sludge treatment device (not shown) outside the shield machine 20. When the excavation of one segment width is completed, the segment 11 is assembled using the erector 12 at the rear of the shield machine 20. A tail seal 13 is attached to a gap between the segment 11 and the shield machine 20 so as to prevent earth and sand and water from entering.

FIG. 3 shows a partition wall 4 in the front body of the shield, a column 6 built at right angles inside the middle body of the shield, and upper and lower parts mounted on and below the partition 4 and the column 6, respectively. FIG. 5 is a perspective view showing the configuration of a reinforcing frame composed of the horizontal frames 5A and 5B, and details of the arrangement of a slide jack 7 as a moving mechanism of the left and right widening cylinders 3L and 3R. The four slide jacks 7 are attached to the inside of the shield of the horizontal frames 5A and 5B, four at the top and four at the bottom.
Front and rear to move the right wide body slide jacks 7R and 7r, and the front and rear to move the left wide body 3L.
It consists of the rear two left body slide jacks 7L, 7l,
The right body slide jacks 7R, 7r and the left body slide jacks 7L, 7l are arranged alternately in the front and rear directions.
In FIG. 1, reference numeral 5P denotes a partition of the horizontal frames 5A and 5B, which are upper and lower trunks, and is formed integrally with the partition 4 (omitted in FIG. 1A). FIG. 4 is a perspective view showing a shield body (left and right widening bodies 3L, 3R) moving left and right in the shield excavation direction by the slide jack 7, and a main cutter is provided at the rear of the partition wall 4. Moving partition 3 having a rectangular notch for avoiding one of the shafts
p and 3q are located so as to overlap with the partition wall 4.
In addition, a plate-like extension extending in the axial direction of the shield is formed at the rear part of each of the moving bulkheads 3p and 3q, and above and below the left and right widening cylinders 3L and 3R, A jack receiving portion 3x for receiving the distal end portion of the slide jack 7 is provided at a position corresponding to the distal end portion of the slide jack 7 on the inner end surface of the extension portion inside the shield.
The slide jack 7 pushes the jack receiving portion 3x leftward and rightward of the shield, respectively, so that the left and right widening cylinders 3L and 3R move leftward and rightward, respectively, and the shield trunk 3 widens left and right. Is done. In addition, the moving partition walls 3p, 3
A water stop seal (not shown) is provided at a moving portion at the time of widening such as between q and the partition wall 4.

FIG. 5A is a view showing an example of the slide jack 7. The slide jack 7 extends and contracts a rod 7p by a cylinder 7a housed in a guide member 7b, and is shown in FIG. 5B. So, shield machine 20
Before and after the slide jacks 7R, 7L, 7r, 7
The amount of expansion and contraction of each rod 7p is appropriately set, and the amount of widening in the front and rear directions of the shield body (left and right widening bodies 3L and 3R) is changed. Note that even when the left and right widening cylinders 3L and 3R are not parallel, the jack receiving portion 3x is pressed uniformly,
The tip 7x of the rod 7p is formed as a curved surface so that the left and right widening cylinders 3L and 3R can move smoothly.
Reference numeral 7q denotes a receiving portion of the movable partition walls 3p and 3q, which is normally in contact with the jack receiving portion 3x.

FIGS. 6A and 6B are a front view and a sectional view taken along the line AA (see FIG. 1) of the shield machine 20 when the widening section is constructed. 3R is moved left and right by the slide jack 7 described above,
The over-digging device 2 provided on the main cutter 1 is driven to perform left and right widening excavation. Excavation device 2 is shown in FIG.
As shown in (a), an excavating cutter 2b is attached to the tip of an expanding and contracting arm 2a, and one excavating cutter 2b is attached to each of the symmetrical positions of the main cutter 1. Left and right widened cylinders 3L, 3R
Main cutter 1
The length of the arm 2a is controlled in synchronization with the rotation of the arm. At this time, the movable partition walls 3p and 3q are widened to the left and right while overlapping with the partition wall 4. Since the shield excavator 20 is reinforced by the above-mentioned reinforcing frame, the rigidity of the shield excavator 20 as a whole is high, and therefore, it is possible to sufficiently receive the reaction force received by the left and right widening cylinders 3L and 3R during widening excavation. it can.

FIG. 6 (c) is a view showing the state of the shield machine 20 during the widening construction in the sectional view taken along the line BB (see FIG. 1). The slide jack 71 pushes the left widening cylinder 3L and the right widening body slide jack 7r pushes the right widening cylinder 3R to the left and right, respectively.
At this time, the respective propulsion jacks 10 arranged inside the left and right widening cylinders 3L, 3R move left and right, respectively, integrally with the widening cylinders 3L, 3R. When the excavation of one segment width is completed, the segment 1
Assemble 1. FIG. 7A is a diagram illustrating a digging shape of a general portion by the shield machine 20, and FIG. 7B is a diagram illustrating a digging shape of the widened portion. In the figure, a backfill material made of a mixture of cement, water glass and the like is injected and filled into a tail void 17v (hatched portion in the figure) generated by excavation by the subcutter 5k. Further, as described later, the segment 11 used for the general portion and the widening portion is used in accordance with the excavation shape of the tunnel.

FIG. 8 shows a shield machine 2 according to the present embodiment.
FIG. 4 schematically shows how to excavate a tunnel 18 provided with a tapered portion in the excavation direction using 0, and the amount of widening of the shield body 3 in the left and right directions is measured before the shield excavator 20. Since it can be changed in the backward direction, the entire shield excavator 20 can be moved along the tunnel shape. Therefore, the amount of extra excavation can be reduced, and as a result of excavation,
The clearance between the shield machine and the ground can be reduced.

FIG. 9A is a diagram showing a state where the segment 11 is assembled on a general portion having a circular cross section, and FIG. 9B is a diagram showing a state where the segment 11 is assembled on a tapered portion or a widened portion. is there. In the general part, as shown in FIG.
A, 11B, and 11K are used. In the tapered portion or the widened portion, in addition to the segments 11A and 11K, FIG.
As shown in (b), segments 11M and 11N having a horizontal portion 11y between two arc portions 11x are used.

When the segment is a segment used in a tapered portion, the segment width direction (digging direction) is formed in a tapered shape. For example, in the arc-shaped segment 11A, as shown in FIG. 11A, the outer circumferential side in the segment width direction is formed in a tapered shape on both side surfaces 11z, 11z of the segment 11A, and a step is formed between the rings on the outer surface of the segment. Not to occur. Alternatively, FIG.
As shown in (b), the cross section in the segment width direction is formed as a parallelogram so that no step is formed on both the inner and outer surfaces of the segment. However, no taper is formed on the segment 11K, which is a K segment, and no taper is formed on the side surface on the segment K side of each of the segments 11B, 11M, and 11N adjacent to the segment K. FIG.
Is a view in which a segment having a parallelogram segment cross section is used to assemble the segment in the widened portion. Since the outer surface of the segment 11A is formed in a tapered shape, the tail seal plate 13a of the tail seal 13 is attached to the segment. It can be set following the outer circumference. In addition, since the gap between the outer periphery of the segment and the ground is substantially constant, the tail seal 13 can be attached without increasing the length of the seal brush 13b or increasing the number of hairs, and the water stoppage can be easily improved.

As described above, according to the present embodiment, the left,
A shield excavator 20 that can change the width of the right widening cylinders 3L and 3R in the left and right directions in the forward and backward directions of the excavation direction.
As a segment used for the widened portion and the tapered portion, a segment in which the outer peripheral side in the segment width direction is formed in a tapered shape, or a segment in which the cross-sectional shape in the width direction is a parallelogram, is used as a variable cross section. Since the shield is wrapped, there is no step between the rings on the inner and outer peripheries of the segment 11, so that the followability of the tail seal 13 can be improved, and the lining with high waterproofness can be performed.

In this embodiment, the outer peripheral side in the segment width direction is formed in a tapered shape, or
Although the cross section 11z in the segment width direction is formed as a parallelogram, as shown in FIG. 13 (a), even if only the vicinity of the end of the outer surface of the segment 11 is formed in a tapered shape, the gap between the rings outside the segment can be obtained. Can be eliminated, and the water stoppage can be improved. FIG. 13B is an enlarged view of the section 11z of the segment 11, and a taper portion having a slope larger than the slope is formed at the end of the section 11z of the segment 11 on the side where the slope of the tunnel is increased. , So as to eliminate the step outside the adjacent segment.

[0019]

As described above, according to the first aspect of the present invention, as the segment used for the tapered portion of the variable cross-section shield provided with the tapered portion, the shape on the outer peripheral side of the segment is the same as the tapered portion. Since the segments formed so as to be parallel are used, the step between the rings outside the segments can be eliminated, the followability of the tail seal can be improved, and a highly water-resistant lining is performed. be able to.

According to the second aspect of the present invention, since the tapered portion of the variable-section shield is covered by using a segment having a parallelogram-shaped cross-section in the width direction of the segment, the inside and outside of the segment can be covered. There is no step between the rings in the circumference, and the water stoppage can be further improved.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a shield machine according to an embodiment of the present invention.

FIG. 2 is a sectional view of the shield machine according to the embodiment of the present invention.

FIG. 3 is a diagram showing a frame structure of the shield machine according to the embodiment of the present invention.

FIG. 4 is a diagram showing a widening cylinder of the shield machine according to the embodiment of the present invention.

FIG. 5 is a diagram for explaining a mechanism for moving the widening cylinder according to the embodiment of the present invention.

FIG. 6 is a diagram showing a front view of the shield machine when widening and a cross section of the shield body.

FIG. 7 is a diagram showing an excavation shape by the shield machine according to the embodiment.

FIG. 8 is a diagram showing a state of excavation in a tapered portion of the shield excavator according to the embodiment.

FIG. 9 is a diagram showing an assembled state of segments according to the embodiment of the present invention.

FIG. 10 is a diagram showing an example of a segment shape according to the embodiment of the present invention.

FIG. 11 is an example of a segment having a taper according to the embodiment of the present invention.

FIG. 12 is a diagram showing a tunnel cross section of a tapered portion using a segment having a parallelogram cross section according to the embodiment of the present invention.

FIG. 13 is a diagram showing a tunnel section when a segment having a section having a taper near an end is used.

FIG. 14 is a view for explaining a method of lining a tapered portion of a variable-section shield by a conventional parallel-expansion type shield propulsion device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main cutter 2 Overhanging device 3 Shield trunk 3L Left widening cylinder 3R Right widening cylinder 4 Partition wall 5A, 5B Horizontal frame 6 Post 7 Slide jack 8 (Main cutter) shaft 9 (Main cutter) drive 10 Shield propulsion jack 11 Segment 12 Elector 13 Tail seal 14 Mud feed pipe 15 Drain pipe 16 Agitator 20 Shield excavator

Continued on the front page (72) Inventor Shin Koda 2-1 Tsukudo-cho, Shinjuku-ku, Tokyo Tokyo Main Office (72) Inventor Tomoo Mimura 2-1 Tsukudo-cho, Shinjuku-ku, Tokyo Kumagaya Gumi Tokyo head office

Claims (2)

[Claims] 1. A segment used for a tapered portion of a variable cross-section shield provided with a tapered portion having a widened width varying between a general portion having a circular cross section and a widened portion obtained by widening the cross section in a radial direction. A lining structure for a variable-section shield, wherein a segment formed so that an outer peripheral shape is parallel to the tapered portion is used. 2. The lining structure of a variable cross-section shield according to claim 1, wherein the cross-sectional shape of the segment in the width direction is a parallelogram.