JPH02296993A - Tunnel part spread shield method and device thereof and guide segment piece related thereto - 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 (a) Industrial Application Field The present invention provides an economical way to expand the enlarged section necessary to provide evacuation facilities, inspection facilities, or branch 1 convergence sections in underground railway, road tunnels, etc. The present invention relates to a tunnel part enlargement shield construction method and its equipment, and a guiding segment piece related thereto.

(b), Prior Art Conventionally, when partially enlarging a tunnel, it is common to excavate the section to be enlarged from the ground using a cut-and-cover method, and then construct the partially enlarged section.

(C) 0 Problems to be Solved by the Invention However, this method cannot be used in areas where above-ground or underground structures pose obstacles. In addition, even in areas where there are no obstacles above ground or underground and it is possible to excavate from the ground, there are problems such as securing a work zone on the road, interfering with traffic vehicles, interfering with buried objects, etc., and it is also necessary to excavate extra space. This would be uneconomical.

In order to solve the above-mentioned problems, the present invention provides a tunnel partial enlargement shield construction method, an apparatus therefor, and a guide segment piece related thereto, which can form a sub-tunnel using a shield excavator capable of excavating along a main tunnel. The purpose is to provide the following.

(d) Means for solving the 8 problems, that is, 1 of the present invention, the invention of the shield excavator has the outer shell (1
1), and a sliding part (ll) formed in the outer shell (11) in a shape corresponding to the outer peripheral surface (2a) of the main tunnel (2)
b) is provided, and the outer shell (11) is engaged with a guide engagement portion (7a) provided in the main tunnel (2) to engage the outer shell (11).
), an excavation jack (15) is provided, and an excavation means (12) is provided in front of the outer shell (11) in the excavation direction.

Further, among the present invention, the invention of the guiding segment piece has a main body (7b) formed in a circular arc shape, and the main body (7b
) is provided with a guide engagement part (7a) that can guide the shield excavator (5) to excavate in the direction in which the main tunnel (2) is formed.

In addition, in the invention of the tunnel part enlargement shield construction method of the present invention, when constructing a single-line tunnel (2), the guide segment piece (7) is guided by the guide engagement portion (7a) in the direction of formation of the main line tunnel (2). A shield excavator (5) is installed outside the main tunnel (2) with a guide part (17b) engaged with the guide engaging part (7a), and the guide The shield excavator (5) is configured to excavate along the guide engaging portion (7a) via the portion (17b).

Note that the numbers in parentheses are for convenience to indicate corresponding elements in the drawings, and therefore, this description is not limited to the descriptions on the drawings. r (a) below,
The same applies to the column "Effect".

(e) 0 effect With the above-described configuration, the present invention provides a shield excavator (5)
is the guide engagement portion (7a) of the guide segment piece (7)
It works by digging along the

(f), Example Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a plan cross-sectional view of a tunnel construction site where the tunnel enlargement shield construction method according to the present invention is being applied.

Figure 2 is a cross-sectional view taken along the line ■-■ in Figure 1, and Figure 3 is a cross-sectional view of Figure 1.
A cross-sectional view taken along the ■-m line in the figure, Figure 4 is IV-I in Figure 1.
It is a sectional view taken along the V line.

As shown in FIG. 1, a tunnel construction site 1 where the tunnel partial expansion shield construction method according to the present invention is being applied is as follows.
It was divided into arrows A and B, which are the left and right directions in the figure. It is composed of an enlarged construction section AREl and a normal construction section ARE2, and the enlarged construction section ARE1 further includes an enlarged construction completed section ARE 1a and an enlarged construction section rWJARE 1.
It is composed of b. At tunnel construction site 1, enlarged construction section AREI and normal construction section ARE 2 are indicated by arrow A,
It has a cylindrical main line tunnel 2 penetrating in the B direction, and the first part of the main line tunnel 2 in the enlarged section AREla.
A starting base 3 surrounded by a concrete slab 3a is formed at the bottom of the figure. Furthermore, to the left of the starting base 3 in the diagram, there is an enlarged section ARE 1a and an enlarged section AR.
A shield excavator 5 is provided at the boundary of E 1 b so as to be able to freely excavate in the direction of arrow A along the main tunnel 2.

As shown in Fig. 4, in the main line tunnel 2 part in the enlarged section A RE la, a normal segment piece 10 formed in the shape of a circular arc has an occluded circular cross section with a predetermined radius of curvature (outer diameter) R1. It has a segment body 6 assembled into a cylindrical shape, and both ends 6A, 6a of the segment body 6 have a radius of curvature R1 that is the same as the radius of curvature R1 of the segment body 6.
Guide segment pieces 7.7 each having an arc-shaped main body 7b are connected to each other so as to form part of two cylindrical main tunnel sections. A guide groove 7a is provided on the tunnel inner side of the main body 7b of each guide segment piece 7 in the direction in which the main tunnel 2 is formed, so that the shield excavator 5
Expand construction area ARE in the direction of arrows A and B, which are the excavation directions.
Furthermore, a plurality of support columns 9 having a width W1 are installed in the same direction at predetermined intervals between both guide segment pieces 7.7.

In addition, as shown in Figure 2, the main line tunnel 2 part within the section AREl b scheduled for expansion is
It is constructed almost the same as the main line tunnel 2 section in REla, but both the upper and lower guide segment pieces 7.7 in the figure
The only difference is that a movable segment piece 20 is installed between them instead of the support column 9. Movable segment piece 2
0 is the segment main body 6, the guiding segment piece 7
It has a main body 20b formed in an arc shape with the same radius of curvature R1 as the radius of curvature R1 of the movable segment piece 2010, the guiding segment piece 7°7, and the segment main body 6 are combined to form a complete cylinder. Two sections of the main line tunnel have been formed.

This movable segment piece 20 has its concave surface, i.e. the main body 2
A tapered engagement hole 20a is formed in the center of the left side surface of FIG. , D direction.

The main line tunnel 2 portion in the normal construction section AREZ is composed of normal segment pieces 10 assembled into a cylindrical shape with the same radius of curvature R1 as the main line tunnel 2 section in the expanded construction section AREl.

Further, as shown in FIGS. 1 and 2, the shield excavator 5 has an outer shell 11 formed in a cylindrical shape with a crescent cross section, and the outer shell 11 has a radius of curvature of the single-line tunnel 2. R1
It is composed of a sub-tunnel forming part 11a having a circular cross section with a smaller radius of curvature R2 and a sliding part 11b having a circular cross section having the same radius of curvature as the radius of curvature R1 of the main tunnel 2.

Note that the sliding portion 11b of the outer shell 11 is formed in an inwardly recessed shape and is in opposing contact with the outer circumferential surface 2a of the single-line tunnel 2. A swinging cutter 12 is supported on the front surface of the outer shell 11, that is, on the left side surface in FIG.
It is connected to a drive motor 13 provided on a bulkhead lid which is provided to block the internal space in the left and right directions in the figure. Furthermore, there are multiple shield jacks 15 on the bulkhead lid.

As shown in FIGS. 1 and 3, the rams 15a are arranged in a semi-circular manner along the sub-tunnel forming portion 11a of the outer shell 11, and the shield jack 15 has rams 15a indicated by arrows A and B.
It is provided so that it can protrude and retract freely in the direction. Behind the ram 15a, as shown in FIGS. 1 and 4, there is a cylindrical sub-tunnel 25 having a truncated circular cross section with the same radius of curvature R2 as the sub-tunnel forming portion 11a of the outer shell 11 of the shield excavator 5. is formed, and the sub-tunnel 25 is composed of sub-tunnel segment pieces 16 connected in the directions of arrows A and B. Further, inside the sub-tunnel 25, an erector 23 for assembling the sub-tunnel segment piece 16 is installed in a form connected to the outer shell 11, that is, in a form that moves together with the outer shell 11 during shield excavation. There is.

In addition, as shown in FIGS. 1 and 3, on the sliding portion 11b of the outer shell 11, a shield excavation guiding device 17 extends from the sliding portion 11b in the direction of arrow C, which is the side of the main tunnel 2. The shield excavation guide device 17 is provided so as to be movable together with the shield excavator 5 in the directions of arrows A and B, which are the shield excavation directions.
b, 17b. That is, a rectangular parallelepiped-shaped main body 17a is fitted between the guiding segment pieces 7.7, and rod-shaped guide bars 17b, 17 whose axes are in the shield excavation direction are provided at the upper and lower ends of the left side of the main body 17a in FIG.
b is the guide groove 7a, 7 of the guiding segment piece 7.7.
They are formed integrally with the main body 17a in such a manner that they are respectively engaged with the main body 17a. Furthermore, the shield excavation guidance device 17 is provided with an existing segment attachment/detachment device 19, and the existing segment attachment/detachment device 19 removes the movable segment piece 20 installed on the left side of the shield m-advance guidance device 17 in FIG. It also has an arm 19a on the right side of the shield excavation guide device 17, on which a support column 9 can be erected.

Since the tunnel construction site 1 has the above-mentioned configuration, the tunnel partial enlargement shield construction method is performed in the following steps. That is, first, by using a tunnel construction method such as the shield method, the enlarged construction section ARE1 and the normal construction section ARE2 are constructed.
The normal segment pieces 10 are arranged with a predetermined radius R.
1 into a cylindrical shape to form a main tunnel 2.

At this time, only on the construction side of the secondary tunnel 25 of the main tunnel 2 section within the expanded construction section AREl, that is, on the right side of Figure 2.
Instead of the usual segment piece 10, the guide segment piece 7.7 and the movable segment piece 20 are assembled in a form in which segment pieces of the same type are connected in the directions of arrows A and B. Then, the guide grooves 7a, 7a of the guide segment piece 7.7.

The enlarged construction sections ARE1 are formed linearly in the same direction along the entire length thereof.

Next, after reinforcing the ground 26 at the bottom of Figure 1 of the main line tunnel 2 section in the expanded construction section ARE 1 using auxiliary methods such as ground improvement, a concrete slab 3a was poured into a box shape at the same location. 1 Launch base 3 will be established. The shield excavator 5 is carried into this starting base 3, and the sliding part 11b of the outer shell 11 of the shield excavator 5 is aligned with the outer circumferential surface of the guiding segment piece 7.7 and the movable segment piece 20, that is, the outer circumferential surface of the main tunnel 2. 2a, and the guide bars 17b, 17b of the shield excavation guide device 17.

The guiding segment pieces 7.7 are installed facing leftward in FIG. 1 so as to engage with the guide grooves 7a, 7a of the guiding segment pieces 7.7, respectively.

Also, at this time, the main body 17a of the shield excavation guiding device 17
is positioned in one segment having a width L1 of the main tunnel 2.

In this way, when the shield excavator 5 is installed beside the main tunnel 2, the work of forming the sub tunnel 25 begins. To do this, first, using the erector 23, move the auxiliary tunnel segment piece 16 along the outer shell 11 behind the retracted ram 15a of the shield jack 15 of the shield excavator 5, that is, to the right in FIG. Assemble and install in a circular shape.

Next, the existing segment attaching/detaching device 19 is driven to remove one movable segment piece 20 installed on the left side of the shield excavation guide device 17 in FIG. 1 toward the top in FIG. This removed movable segment piece 20 faces the sliding part 11b of the outer shell 11, and
Since water pressure etc. are not acting, movable segment piece 2
0 removal work can be done safely. Next, the drive motor 13 is driven to swing the swing cutter 12 in the directions of arrows S and T, and the ram 15 of the shield jack 15 is
A is made to protrude in the direction of arrow B in FIG.
The swinging cutter 12 is connected to the face 27 through the ID and outer shell 11.
direction, that is, in the direction of arrow A. Then, due to the pressing force, the face 27 and the swing cutter 12 come into contact with each other with a predetermined contact pressure, and the face 27 is excavated by the swing cutter 12 in the direction of arrow A.

At this time, during excavation work by the swing cutter 12, the outer shell 11 supporting the swing cutter 12 may be affected by uneven protrusion of the rams 15a of a plurality of shield jacks 15, softness of the face 27 to be excavated, etc. Due to reasons such as partial non-uniformity,
Although there is a possibility that the excavation will deviate from the six desired arrow directions and attempt to dig in an unexpected direction, the outer shell 11 is provided with the shield excavation guide device 17, as described above.

There is no such worry. That is, the shield excavation guiding device 1
The guide bars 17b, 17b of the guiding segment pieces 7.7 move in the same direction so as to engage with the guide grooves 7a, 7a of the guiding segment pieces 7.7, which are linearly connected in the direction of shield excavation. There is no digging in any direction other than the direction of arrow A, and the digging operation is properly performed.

In this way, the outer shell 11 digs a distance L1 in the six directions of the arrow, and the main body 17a of the shield digging guide device 17 reaches the next ring installation position, that is, the ring position where the movable segment piece 2o that was removed immediately before was installed. Then,
The arm 19a of the existing segment attachment/detaching device 19 is moved to the rear of the existing segment attachment/detachment device 19. Thereafter, one pillar 9 of the book W1 is erected using the arm 19a on the right side of the shield excavation guiding device 17 in FIG. This prevents the main tunnel 2 and the sub-tunnel 25 from deforming or collapsing due to external pressure such as the earth pressure of the surrounding ground 26 and water pressure.

Note that the width W2 of the main body 17a of the shield excavation guide device 17 in the directions of arrows A and B, which is the excavation direction, is smaller than the width L1 of the segments constituting the single-line tunnel 2, so the outer shell 1
1 by a distance L1 in the six directions of the arrow,
The main body 17a is always positioned at the next ring portion, and when installing the support 9, one main body 17a will not interfere and prevent work from being done.

In this way, when the support 9 is installed behind the shield excavation guide device 17, the ram 15 of the shield jack 15
a in the direction of arrow A, sub-tunnel segment piece 16
It is moved back by a length Ll corresponding to one ring. Then, a space having a distance L1 is formed between the ram 15a and the installed sub-tunnel segment piece 16. Therefore, the auxiliary tunnel segment piece 16 is assembled and installed in the space using the erector 23 in a circular shape so as to be connected to the auxiliary tunnel segment piece 16 that has been installed. Thereafter, when construction is carried out in the same manner as the above-described procedure, the sub-tunnel segment pieces 16 are successively assembled and installed in the direction of arrow A, and the sub-tunnel 25 is formed.

In the above manner, the sub tunnel 2 is installed beside the main tunnel 2.
5, it is only necessary to excavate the area to be expanded, so there is no need to excavate the ground 26 vertically from the ground to the area using the cut-and-cover method.

In the above embodiment, the shield excavator 5 has an outer shell 11 with a crescent cross section, but the present invention is capable of excavating horizontally along the outer peripheral surface 2a of the single-line tunnel 2. , a shield excavator 5 having an outer shell 11 of any cross-sectional shape may be used.

(g) 6 Detailed explanation of the invention As described above, the invention of the shield excavator has an outer shell 11, and the outer shell 11 has a shape corresponding to the outer circumferential surface 2a of the main tunnel 2. The sliding part 11 formed in
b is provided in the outer shell 11 to engage with a guide engagement portion provided in the single-line tunnel 2 such as the guide bar L7b, and the outer shell 1
1, an excavation jack such as a shield jack 15, and an excavation means such as a swing cutter 12 in front of the outer shell 11 in the excavation direction. By engaging with the guide engagement part provided in the tunnel 2 and guiding the outer shell 11 along the main tunnel 2, a sub tunnel 25 can be easily formed beside the existing main tunnel 2, and the tunnel portion can be easily formed. It becomes possible to carry out expansion construction.

According to one aspect of the present invention, the guide segment piece has a main body 7b formed in an arc shape, and the main body 7b
Since a guide engaging portion such as a guide groove 78 for guiding the shield excavator 5 to excavate is provided in the forming direction of the main tunnel 2, the guide portion of the shield excavator 5 can be engaged with the guide engaging portion. By moving the shield excavator 5 along the guide engagement portion, the shield excavator 5 can be accurately excavated along the main tunnel 2.

Furthermore, according to the invention of the tunnel part enlargement shield construction method of the present invention, when constructing the main line tunnel 2, the guide segment piece 7 is moved so that the guide engaging portions such as the guide grooves 7a are aligned with the direction in which the main line tunnel 2 is formed. A shield excavator 5 is installed outside the main tunnel 2 with a guide section such as a guide bar 17b engaged with the guide engagement section, and Since the structure is such that the shield excavator 5 excavates along the joint, the shield excavator 5 is used to excavate along the main tunnel 2 beside the main tunnel 2 regardless of the presence or absence of obstacles on the ground or underground. This makes it possible to easily form the sub-tunnel 25. Therefore, there are no problems such as securing a work zone on the road or causing obstacles to traffic vehicles, which is the case when using the cut-and-cover method.
Further, the labor of excavating the ground 26 in the vertical direction is also saved, and it is possible to carry out partial enlargement of the tunnel extremely economically.

[Brief explanation of the drawing]

FIG. 1 is a plan sectional view of a tunnel construction site to which the tunnel enlargement shield method according to the present invention is being applied, and FIG. 2 is a sectional view taken along the line ■-■ in FIG. FIG. 3 is a cross-sectional view along tn-mg of FIG. 1. FIG. 4 is a sectional view taken along line V-IV in FIG. 1. 2...Main tunnel 2a...Outer peripheral surface 5...Shield excavator 7...Guiding segment piece 7a...Guide engaging portion ( Guide groove) 7b...
...Main body 11...Outer shell 11b...Sliding portion 12...Excavation means (oscillating cutter) 15...
... Excavation jack (shield jack) 17b...
...Guide part (guide bar) AREI...
Expansion construction section ARE1 a...Expansion construction completed section ARE 1
b...Expansion planned section ARE2...
Normal construction section Figure 2 ARElb

Claims (3)

[Claims] (1), having an outer shell; The outer shell corresponds to the outer peripheral surface of the main line tunnel. A sliding part formed in the shape is provided, A guide provided in the main line tunnel is attached to the outer shell. a guide portion that engages with the do engagement portion and guides the outer shell; Furthermore, a jack for digging is installed, An excavation means is provided in front of the outer shell in the excavation direction. A shield excavator configured with (2) The main body is formed in an arc shape, and the main body is provided with a guide engagement portion in the direction of forming the main tunnel, which allows the shield excavator according to claim 1 to guide the excavation. induction segment piece, (3) When partially enlarging a tunnel using the shield excavator and the guide segment piece according to claims 1 and 2, the guide segment piece is used when constructing a main tunnel. The guide engaging portion is installed so as to match the forming direction of the main line tunnel, a shield excavator is installed outside the main line tunnel with the guide portion engaged with the guide engaging portion, and the guide portion is A shield construction method for enlarging a tunnel portion, in which a shield excavator excavates along the guide engagement portion through the tunnel portion.