JPH03180692A - Building method for enlarging tunnel part - Google Patents

Abstract

PURPOSE:To facilitate execution of a work by building a ditchform pit throughout the overall length of an enlargement scheduled section, causing pushing of a small curved pipe body from the one side of the pit in a manner to make one round of the outer periphery of an existing lining to cause the pipe body to arrive at the other side of the pit, and repeating above works. CONSTITUTION:A pit 4 is built throughout the overall length of the enlargement scheduled section of an existing tunnel 1. A pipe body press-in device 5 comprising a small excavator 13, curved so as to have the same curved surface as that of an enlarging tunnel 2, and a jack 11 is disposed in the pit 4. Excavation is progressed by pushing the excavator 13 by means of the jack 11, curved pipe bodies 14 are orderly coupled to the back of the excavator 13 to make one round of the outer periphery of the tunnel 1, and the excavator 13 is excavated to the other side of the pit 4. Further, a similar work described above is repeated by using the pipe bodies 14 serving as a guide to build an enlarging lining part 18. This method freely sets size and a shape and executes a work through small scale excavation.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for constructing an enlarged tunnel section at a desired length of a tunnel constructed by a shield method.

[Conventional technology]

In general, tunnels for sewers, subways, or wiring tunnels are excavated using the shield method, but when building evacuation areas or stations in subways, or when a space for installing drainage and ventilation equipment or a space for wiring is required. In this case, it is necessary to provide an enlarged tunnel portion at a predetermined length of the tunnel.

Such an expanded tunnel section is usually constructed by excavating the tunnel using the shield method, then excavating a vertical shaft from the ground at the planned tunnel expansion location, and using this vertical shaft to construct the desired tunnel expansion section. There is.

However, in urban areas, etc., it may not be possible to excavate a vertical shaft from the ground due to deteriorating road conditions or environmental conservation considerations.

For this purpose, for example, as described in Japanese Patent Publication No. 62-16310, a shield segment of a desired width in an area scheduled for expansion of an existing tunnel is removed over the entire length of the area, and a pit is placed in the area where it was removed. After cutting, a circumferential shielding machine is installed in the pit, and guide members are installed in the circumferential direction at both ends of the area to be expanded, and the base of the circumferential shielding machine is engaged with this guide member to open the shield jack. A method has been developed for constructing a tunnel enlargement by sequentially connecting circumferential shield segments while the circumferential shield machine is propelled along a guide member by elongation.

[Problem to be solved by the invention]

According to this construction method, it is possible to construct an expanded tunnel without excavating a vertical shaft, but it requires large-scale equipment to propel a circumferential shield machine that spans the entire length of the planned area. In accordance with the progress, it is necessary to excavate earth and sand and remove shield segments in areas scheduled for expansion, which causes problems in that work is crowded and efficiency is reduced.

Furthermore, since the circumferential shield machine uses the existing tunnel as a fulcrum and goes around the outer circumference of this tunnel, the tunnel expansion part to be constructed will be formed concentrically with the existing tunnel, and it will be a part of the existing tunnel. It is not possible to form a widened part wider than the other side part.

Further, as mentioned above, since it is difficult to propel a large-scale circumferential shield machine, there have been problems such as difficulty in constructing a tunnel expansion section that is long and has a large cross section.

The present invention provides a method for constructing an enlarged tunnel section, which aims to solve these problems.

[Means to solve the problem]

In order to achieve the above object, the method for constructing an expanded tunnel section of the present invention includes providing a pit having an appropriate width and depth over the entire length of the area to be expanded in an existing tunnel lining constructed by the shield method. , Small-diameter curved pipes having a desired length are connected in series from an appropriate position on one side of the pit, and are propelled around the outer periphery of the existing tunnel lining to reach the other side of the pit. By doing so, an enlarged lining part of one element is formed, and the enlarged lining part is made up of the next row of small diameter curved pipe bodies adjacent to the enlarged lining part, using the small diameter curved pipe body forming this enlarged lining part as a guide. is formed in the length direction of the tunnel, and this work is repeated over the entire length of the planned expansion area to form an expanded lining that covers the existing tunnel lining in the planned expansion area. This method is characterized by removing the existing tunnel lining and excavating and removing the earth and sand within the expanded lining.

[For production]

By connecting small-diameter curved pipes having a desired length in series from an appropriate position on one side of the pit, the pipes are propelled around the outer periphery of the existing tunnel lining to reach the other side of the pit. First, since an expanded lining of one element is formed in a portion of the tunnel lengthwise in the planned expansion area, the expanded lining can be constructed by relatively small-scale excavation means, and the expanded lining can also be expanded. The size and shape of the existing tunnel can be set relatively freely, and it is possible to obtain an expanded lining section in which one side of the existing tunnel is wider than the other side. The next enlarged lining section is formed in the length direction of the tunnel as a guide, and by repeating this operation, an enlarged lining is formed by a series of enlarged lining sections over the entire length of the area to be expanded. Expanded lining that is relatively long and has a large cross section can be easily constructed.

After constructing the expansion lining in this way, the existing tunnel lining in the area planned for expansion is removed, and the earth and sand within the expansion lining is excavated and removed. The earth and sand excavation work within the construction site can be carried out sequentially and continuously, allowing the construction work of the enlarged tunnel section to be carried out smoothly and efficiently.

In addition, in the above method, when the small diameter curved pipe for forming the expanded lining section is propelled along the outer periphery of the existing tunnel lining, the inner periphery end is moved from an appropriate position on one side of the pit to the outer periphery of the existing tunnel lining. After forming a ring-shaped guide that reaches the other side of the pit by connecting the guide members that engage with the inner circumferential surface and regulate the dimensions up to the planned expansion lining in series, the guide members are guided to the ring-shaped guide. If the small-diameter curved pipe body of the first expanded lining section is propelled while moving, the construction work of the expanded lining section can be performed more reliably.

In addition, a wire is wound in advance at a suitable location on the existing tunnel lining in the planned expansion area so that the outer circumference of the tunnel lining is wrapped once, and after the pit is formed, a small diameter curvature is propelled from one side of the pit. By fixing one end of the wire to the most extreme side of the pipe body and pulling the other end of the wire into the pit from the other side of the pit as the small diameter curved pipe body is propelled, or by pulling the other end of the wire into the pit from one side of the pit. When propelling the small-diameter curved pipe of the temple that forms the enlarged lining section, a wire is fixed to the tip of the small-diameter curved pipe and the inside of the existing tunnel lining is moved toward the planned propulsion route of the small-diameter curved pipe. Guide members are protruded at appropriate intervals in the circumferential direction along the planned propulsion route, and the small diameter curved pipe body is propelled along the guide member by tensioning a wire in the pit. The direction of propulsion can be precisely controlled.

[Embodiment] To explain the embodiment of the present invention with reference to the drawings, in Fig. 1, (1) is an existing tunnel constructed by the shield method, and (2) is the existing tunnel (1). This is the planned expansion tunnel section to be constructed at the desired location.

First, the lower periphery of the secondary cover segment (3) of the existing tunnel (1) in this planned expansion tunnel section (2) is dug down over the entire length of the planned expansion tunnel section (2), and a pit (4 ) (see Figures 1 to 3).

The formation of this pit (4) is due to the primary covering segment I of the core.
- After removing (3), this may be done by appropriate excavation means, but when constructing the tunnel, a widening segment (3a) is assembled in the area where the pit is planned to be formed, and this segment (3a) is It is also possible to form a pit (4) of a desired depth by using the reaction force of the segment (3) on the upper periphery to push down and dig.

After the pit (4) is thus formed, a tube press-fitting device (5) as shown in FIG. 8 is installed in the pit (4).

This tube press-fitting device (5) is mounted on an underframe (5a) that is movable in the tunnel length direction, and the upper surface is located at the planned enlarged tunnel section (2).
A frame (6) formed in a concave arc surface approximately equal to the curved surface of the lining (2) is fixed, and a tube insertion opening (7) and upper and lower guide rollers (8a ) (8b)
A side plate (9) is provided integrally with the underframe (9).
5a) A reaction wall 00) is erected at the other end, and a jack (11) is attached to the inner surface of the reaction wall 0ω, and a push frame that moves on the frame (6) is attached to the rond tip of the jack 00. (121 is attached.

The side plate (9) of this tube press-fitting device (5) is connected to the pit (4).
), and then install the lining (2) of the planned expansion tunnel section (2) on the pedestal (6).
) is placed, and by extending the jack (11), the small diameter excavators 03), which are curved in the length direction with approximately the same degree of curvature as the curved surface of It is pushed out from the insertion port (7) of the side Fi (9) toward the outer periphery of the lining segment (3) of the existing tunnel (1), and is propelled while excavating the earth and sand.

After this small-diameter excavator 03) is completely propelled underground from the side plate (9), the jack 01) is contracted and the mount (6) is
Above is a small-diameter curved pipe body 04) of a constant size, which has approximately the same diameter as the small-diameter excavator 03) and is curved in the length direction with the same degree of curvature.
is connected to and follows the back of this small-diameter excavator 03), and this small-diameter curved pipe body 0 width is pushed forward with a jack (11), and the ground in front is excavated by the small-diameter excavator θ3). Push the small diameter curved pipe Q4) into the ground.

As shown in FIG. 9, the small diameter curved tube body Oa has an engagement guide groove 05) and a locking protrusion 0ω that can be engaged with the engagement guide groove 05) on both side faces facing the tunnel length direction. are provided protruding in the length direction.

The earth and sand excavated by the small diameter excavator 03) is discharged into the pin I-(4) through the space inside the small diameter curved pipe body 04). Note that the reaction force for pushing the tube by the jack (11) is transmitted to the reaction wall 00), and the tube press-fitting device (5)
tries to retreat, so the reaction wall 00) and the pit (4)
An appropriate reaction force receiver 0'7) is interposed between the other sides.

Following the small diameter excavator 03), a small diameter curved pipe body 0 (1
) is press-fitted into the ground, the next small-diameter curved pipe body side of the same shape is added to the small-diameter curved pipe body 04) and press-fitted in the same manner as above, and hereafter, the small-diameter curved pipe body 0 width is followed by the preceding small-diameter curved pipe body 0 width. A plurality of small diameter curved pipes Q4) are successively connected in series and propelled into the ground around the outer periphery of the lining segment (3) of the existing tunnel (1) as shown in FIG. 5.

At this time, the curved and small diameter curved pipe body side of the small diameter excavator 03) is propelled while controlling the direction to surround the outer circumference of the lining segment (3) of the existing tunnel (1) with an appropriate distance from the outer circumferential surface. The tip of the small diameter excavator 03
) goes around the outer circumference of the tunnel and reaches the other side of the pit (4).

In this way, an enlarged lining part 0 mark corresponding to one element is formed on the outer periphery of the lining segment (3) of the existing tunnel (1) by a series of plural small diameter curved pipe bodies 04), and the pit (
After removing the small diameter excavator A which has reached 4), the small diameter curved pipe body side 04) facing both sides of the pit (4) is spaced between the small diameter curved pipe body sides 04) with the same shape as the small diameter curved pipe body 04) and the engagement guide groove 05) mentioned above. (See FIG. 6).

Next, after moving the tube press-fitting device (5) in the tunnel direction by the thickness interval of the enlarged lining section 04), the tube press-fitting device (5) moves the tube adjacent to the enlarged lining section 08). After the small-diameter excavator 03) is press-fitted through the insertion port (7) of the mount (6), the small-diameter curved pipe body 0 is inserted following the small-diameter excavator 03).
・Press in υ. At this time, the engagement guide of the small-diameter curved pipe body 0 facing the rearmost part of the enlarged lining part that has already been buried, that is, the pit (4) on the side plate (9) side of the pedestal (6). When the locking protrusion 06) of the small diameter curved pipe body 04) to be press-fitted into the groove 05) is engaged and press-fitted in this state, the plurality of small diameter curved pipe bodies (14) forming the enlarged lining part side are Since the engagement guide grooves θ9 are connected in a series of ring shapes, the locking projections 0ω can be pushed and press-fitted in a certain direction while slidingly in contact with these engagement guide grooves 05).

In this way, the small-diameter curved pipe body side is successively press-fitted by the pipe press-fitting device (5) in a continuous manner to form an enlarged lining part 08) adjacent to the already buried enlarged lining part 08).

By performing this work sequentially in the length direction of the existing tunnel (1), as shown in Figure 10, the adjacent expanded lining sections 08) are connected to each other over the entire length of the planned expanded tunnel section (2). An enlarged lining 12rj is obtained by a series of parallel enlarged lining parts 08) side...08) that are in contact with the guide section 05) via the locking protrusion 0ω.

In addition, by appropriately setting the degree of curvature of the small-diameter excavator 0 and the small-diameter curved pipe body 04) and its press-in direction, the size of the cross-sectional shape of the enlarged lining 12 (Il) can be determined, and the size of the cross-sectional shape of the expanded lining 12 (Il) can be determined. Enlarged lining Q eccentric to 1)
(D) In other words, the expanded lining C!Φ can be constructed on both sides of the existing tunnel from the outer periphery of the tunnel so that one part of the lining becomes a widened part that is further apart from the other side part.

In this way, after applying the expansion lining QO to the area scheduled for expansion of the existing tunnel (1), the lining segment (3) of the tunnel (1) in the area is removed, or the lining segment (3) In parallel with the removal of
The expanded tunnel section (2) is formed by excavating and removing the earth and sand surrounded by the excavation means using an appropriate excavation means.

In addition, in each enlarged lining section 08), the small diameter curved pipe body 04) at the frontmost part and the small diameter curved pipe body 0 brown at the rearmost part are connected by a curved pipe body 09) in the pit (4). Concrete (21) is placed in the space between the lower circumference of the curved pipe body 09) and the inner bottom surface of the pit (4) (Fig. 7).

Next, in the above embodiment, the shape of the expanded lining section 08) to be constructed first is determined by the degree of curvature of the small-diameter excavator 03) and the small-diameter curved pipe body 04) that follows it, so that it is propelled to a predetermined trajectory. However, it is preferable that the enlarged lining section side is controlled via a direction control means as described below.

That is, as shown in FIGS. 11 and 12, the lining segment (3) of the existing tunnel (1) in the planned expansion area
A locking interval part (23) is provided at a proper position along the entire circumference of the guide member (22), and a guide member (22) is inserted into the locking interval part (23) from the negative side of the pit (4) as shown in FIGS. 13 and 14. As shown in the figure, a locking roller (24) that locks on the inner surface of the lining segment of the existing tunnel (1) is rotatably supported at the inner end, and retaining guide grooves (15a) are provided on both sides of the outer end. and locking protrusion (16
The fan-shaped plate-shaped guide members (22) having appropriate heights, each of which is protruded from a), are successively connected in series and jacked (25).
After forming a ring-shaped guide (A) that reaches the other side of the pit (4), this ring-shaped guide (A)
The engagement guide groove (15a) and the locking protrusion (15a) communicate with each other in a series.
In 16a), a small diameter curved pipe body 0 following the small diameter excavator 03)
While engaging the locking projections 06) or the engagement guide grooves 05) of 4), the small diameter curved tubes 04) are sequentially press-fitted using the tube press-fitting device (5) in the same manner as described above.

The locking interval portion (23) through which the guide member (22) is inserted
) can be effected by interposing a removable ring-shaped member between the lining segments of the tunnel (1) during construction.

In addition, if the guide member (22) can be inserted and locked into the locking interval (23) from the inner surface of the existing tunnel (1), the ring-shaped guide ( A) can be formed.

Furthermore, as shown in FIG. 15, this guide member (22) is provided with a curved tube part (14a) having the same shape as the small diameter curved tube body 04) at the tip thereof.
Similarly to the above, the tubular body press-fitting device (5) may be connected to the small-diameter excavator 03) and sequentially press-fitted from the inside to form a ring-shaped guide. In this case, the curved pipe body part (14a
The engagement guide groove (15b) and locking protrusion (16b) protruding from both sides of ) serve as engagement guides for the locking protrusion 06) and engagement guide groove 05) of the small diameter curved tube body (b). It is something.

The size and shape of the expanded lining section 0■ are similar to the existing tunnel (
The distance from the locking part of the lining segment (3) in 1) to the circumferentially continuous retaining guide groove and locking protrusion of the ring-shaped guide (A), and the series of retaining guide grooves or engaging protrusions. The lining segment of the existing tunnel (1) can be set by changing the height (dimension from the inner end to the guide groove or engagement protrusion) of the guide member (22) sequentially. 3) It is possible to construct expanded linings with different spatial widths around the area.

Figure 16 shows another directional control means, in which the lining segment (3) of the existing tunnel (1) in the area planned for expansion is shown.
When constructing the tunnel, lining segments (3
) The wire (26) is wound around the outer circumference of the pit (4) once, and after forming the pit (4),
) One end of the wire (26) is fixed to the tip of a small-diameter excavator 03) that is propelled into the ground by a jack (27) from the - side of the pit (4), and from the other side of the pit (4)
) into the small diameter excavator 0.
3), a series of small diameter curved pipes 04) are pulled into the existing tunnel (1) by being pulled by a winch (28) installed in the pit (4) as the small diameter curved pipes are pushed in sequentially. The direction of propulsion is controlled so as to follow a desired trajectory on the outer circumference of the lining segment (3), thereby forming an enlarged lining portion 08) of the first element.

Using this enlarged lining part (18) as a guide, the pipe body press-fitting device (5) is used as in the above embodiment to sequentially enlarge the lining part 0.
8) and build the desired expanded lining C1). After construction, the lining segment (3) of the tunnel (1) in the area planned for expansion is removed and the expanded lining i2G is constructed.
Excavate and remove the earth and sand surrounded by the enlarged tunnel section (
2).

FIG. 17 shows still another direction control means, in which the small diameter curved pipe body side is propelled from the -side of the pit (4) to form the first enlarged lining section 08). While fixing a wire (26) to the tip of the small diameter excavator 0 connected to the tip of the small diameter excavator 04), the inside of the existing tunnel lining segment (3) is The guide roller (28) is inserted from the front end through the insertion locking interval part (23) described in the above embodiment.
A guide rod (29) of desired length that rotatably supports the
are projected at appropriate intervals in the circumferential direction along the planned propulsion route, and the wire (26) is connected to the roller (28) of the guide shaft (29).
The wire (26) is pulled by the winch (30) in the pinto (4) while being guided by a series of small diameter curved tubes.
4) is controlled so as to advance by tfi along the guide member.

In this case, the wire (26) may be wound once around the outer periphery of the lining segment (3) and pulled from the other side of the pit (4), as described in the above direction control means.

[Effects of the Invention] As described above, according to the method for constructing an expanded tunnel section of the present invention, the area to be expanded in the existing tunnel lining constructed by the shield method has an appropriate width and depth over the entire length of the area. A pit is provided, and small-diameter curved pipes having a desired length are connected in series from an appropriate position on one side of the pit, and are propelled around the outer periphery of the existing tunnel lining to open the other side of the pit. By reaching this point, an expanded lining of one element is first formed in a portion of the tunnel lengthwise in the area to be expanded, so the expanded lining is formed by relatively small-scale excavation means. In addition to being able to freely set the size and shape of the expanded lining, it is possible to form an expanded lining in which one side of the existing tunnel is wider than the other side. It is something that can be done.

Furthermore, using this expanded lining section as a guide, the next expanded lining section is formed in the length direction of the tunnel, and by repeating this operation, an expanded lining section is formed by a series of expanded lining sections over the entire length of the area to be expanded. Therefore, an enlarged lining with a desired length and large cross section can be easily constructed.

In addition, after constructing the expanded lining in this way, the existing tunnel lining in the area scheduled for expansion is removed, and the earth and sand within the expanded lining is excavated and removed, so it is not the same as the removal work of the existing tunnel lining. The work of excavating earth and sand in the expanded lining can be carried out continuously, and the construction work of the expanded tunnel can be carried out smoothly and efficiently.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; Fig. 1 is a cross-sectional plan view of the tunnel in the area to be expanded, Fig. 2 is a longitudinal sectional front view, and Fig. 3 is a longitudinal sectional front view with a focused state. Figures 4 to 7 are longitudinal sectional front views showing the construction process of the enlarged lining section;
Fig. 8 is a longitudinal sectional front view of the pipe press-fitting device, Fig. 9 is a cross-sectional view showing the connection state of adjacent small diameter curved pipes, Fig. 10 is a cross-sectional plan view of the tunnel section where the enlarged lining has been constructed, and Fig. 1I The figure is a cross-sectional plan view of the direction control means installed, FIG. 12 is a simplified vertical cross-sectional front view showing the installation state of the direction control means, FIG. 13 is a front view of the guide member, and FIG. 14 is its side view. ,
FIG. 15 is a side view showing a modified example of the guide member, and FIGS. 16 and 17 are simplified longitudinal sectional front views showing other direction control means. (1) Existing tunnel, (2) Planned expansion tunnel section, (3) Lining segment, (4) Pinto, (5) Pipe press-in device, 0 1...Small diameter excavator, 04...Small diameter curved pipe body, 08)...Expanded lining section, QO...Expanded lining section. To Nebe Note 2 Be Introduction A to Ote Layer 1 λ Beme 7/1 Nojite 3 Go back, Da 2 Ice Zusho) ≧66 Layer Kine X To Noah side

Claims (4)

[Claims] (1) A pit with an appropriate width and depth is provided over the entire length of the area scheduled for expansion in the existing tunnel lining constructed using the shield method, and a small diameter pit with the desired length is installed from an appropriate location on one side of the pit. The curved pipe bodies of the above are connected in series in sequence and are propelled around the outer periphery of the existing tunnel lining to reach the other side of the pit, thereby forming an enlarged lining part of one element. This work is planned to be expanded by forming an enlarged lining section consisting of the next row of small diameter curved pipe bodies adjacent to the enlarged lining section in the length direction of the tunnel using the small diameter curved pipe body that formed the lining section as a guide. This is repeated over the entire length of the area to form an expanded lining that covers the existing tunnel lining in the area planned for expansion, and then the existing tunnel lining in the area scheduled for expansion is removed and the earth and sand in the expanded lining is removed. A method of constructing an enlarged tunnel section characterized by excavating and removing. (2) When propelling the small diameter curved pipe body for forming the expanded lining section along the outer periphery of the existing tunnel lining,
A guide member whose inner peripheral end engages with the inner peripheral surface of the existing tunnel lining to regulate the dimensions of the planned expanded tunnel lining is moved from a suitable position on one side of the pit to the other side of the pit while being successively connected in series. Construction of an enlarged tunnel section according to claim (1), characterized in that after forming a ring-shaped guide that reaches , the small-diameter curved tube of the first enlarged lining section is propelled while being guided by this ring-shaped guide. Method. (3) A wire is wound in advance at a suitable location on the existing tunnel lining in the planned expansion area so that the outer circumference of the tunnel lining is wrapped once, and after the above-mentioned pit is formed, the wire is propelled from one side of the pit. The small diameter curved tube is propelled by fixing one end of the wire to the tip side of the small diameter curved tube and pulling the other end of the wire drawn into the pit from the other side of the pit as the small diameter curved tube is propelled. The method for constructing an enlarged tunnel portion according to claim 1, characterized in that the direction is controlled. (4) When propelling a small-diameter curved pipe for forming an enlarged lining section from one side of the pit, a wire is fixed to the tip of the small-diameter curved pipe, and the planned propulsion path of this small-diameter curved pipe Guide members are protruded from inside the existing tunnel lining at appropriate intervals in the circumferential direction along the planned propulsion route, and by tensioning the wire in the pit, the small diameter curved pipe body is guided along the guide members. A method of constructing an enlarged tunnel section, characterized by controlling the enlarged tunnel section so as to propel it.