JPH076345B2 - Enlarged tunnel lining method - Google Patents

Description

The present invention relates to a method for constructing an enlarged tunnel portion in a desired length portion of a tunnel constructed by a shield construction method.

[Conventional technology]

Generally, tunnels such as sewers, subways, and wiring pits are excavated by the shield construction method, but when constructing evacuation sites and stations in subways, or where drainage, ventilation equipment installation sites and wiring lead-in spaces are required. In this case, it is necessary to provide an enlarged tunnel portion in a predetermined length portion of the tunnel.

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

However, in urban areas and the like, it may not be possible to excavate a shaft from the ground due to deterioration of road conditions and environmental protection.

Therefore, for example, as described in Japanese Examined Patent Publication No. 62-16309, in the expansion planned area in the existing tunnel constructed by the shield construction method, the tunnel lining at one end is cut open to form an expanded excavation portion, An expansion shield excavator for excavating the outer circumference of the existing tunnel is installed in this expansion excavation part, and the expansion shield excavator is promoted while sequentially removing the existing tunnel lining in front of it, and the expansion part is expanded to the planned expansion area. A method of building a building has been developed.

[Problems to be Solved by the Invention]

According to this method, the tunnel expansion part can be built without excavating the vertical shaft, but the existing tunnel lining is sequentially removed prior to the excavation of the expansion part by the shield excavator for expansion. If the existing tunnel lining constructed on the ground or the flooded ground is removed, there is a problem that the ground collapses or groundwater enters the tunnel to significantly reduce workability.

In addition, the removal work of the existing tunnel lining must be performed while sequentially moving the lining segment dismantling device forward, and the guide rail of the lining segment dismantling device is removed as the expansion shield excavator advances. Work such as is required.

The present invention provides a method for enlarging a lining of a tunnel, which aims to solve such problems.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, the tunnel expansion lining method of the present invention is to remove both end lining parts in an expansion planned area of an existing tunnel lining constructed by the shield construction method and to set an expansion starting base on one of the removal marks. After excavating and forming the expansion reaching base on the other side, an excavation face plate that is approximately equal to the outer peripheral shape of the expansion lining to be built at the expansion starting base is provided, and the front face of the excavation face plate is covered with the existing tunnel covering exposed to the expansion starting base. The expanded lining material of one element is arranged on the rear surface of the outer peripheral portion while being brought into contact with the rear end surface of the work, and then the expanded lining material and the excavated face plate are pressed by pressing the rear surface of the expanded lining material with a propulsion device. The existing tunnel lining in the planned expansion area is pushed through to the expansion destination base side and the ground to be expanded in front is excavated by the excavation part of the excavation face plate protruding outward from the rear end of the existing tunnel lining. While taking it into the starting base, removing the existing tunnel lining part that reached the expansion base by promotion and removing the existing tunnel lining part in the base, while the next expansion lining is in contact with the rear surface of the expansion cover inside the base. It is characterized by constructing an enlarged portion by an enlarged lining material over the entire length of the area to be enlarged by repeating the above operation by pushing it in the same manner as above with a propulsion device.

[Action]

An expansion start base and an arrival base are excavated and formed at both ends of the expansion planned area of the existing tunnel lining, and an excavation face plate having substantially the same outer peripheral shape of the expansion lining to be built at the extension start base is provided. The front surface of the expanded lining material is brought into contact with the rear end surface of the existing tunnel lining exposed at the expansion starting base, and the expanded lining material of one element is arranged on the rear surface of the outer peripheral portion. Since it presses, the existing tunnel lining in the planned expansion area is generally pushed to the arrival base side while being buried in the ground, while preventing inundation of groundwater etc. with the existing tunnel lining. The excavated face plate allows the ground in the planned expansion area to be dug forward.

Furthermore, since the existing tunnel lining that has reached the expanded arrival base due to propulsion is to be removed within the arrival base, the tunnel lining segment dismantling device is not moved, and the existing tunnel lining is kept in a stationary state. The segments can be dismantled and removed sequentially.

In addition, following the forward movement of the excavation face plate, the expanded lining material is sequentially connected and pushed forward, and the expanded portion of the expanded lining material can be efficiently constructed over the entire length of the planned expansion area.

〔Example〕

An embodiment of the present invention will be described with reference to the drawings. In FIG. 1, (1) is an existing tunnel constructed by a shield construction method, and (2) is an existing tunnel to be constructed at a desired portion of the existing tunnel (1). It is an enlarged tunnel section.

First, both ends of the lining portion (3) of the existing tunnel (1) in the enlarged tunnel portion (2) to be constructed, that is, the lining portion (formation end portion and end portion of the formation of the enlarged tunnel portion (2) ( The segment (3 ') of 3) is removed by an appropriate length, and the ground is excavated from the removed portion in the outer diameter direction of the existing tunnel (1) by an appropriate excavation means to construct an expanded tunnel section (2). Enlarged starting base at the start of formation (4)
And the extended arrival bases (5) are respectively formed at the end portions.

At this time, before the segment (3 ') is removed, the portion where the bases (4) and (5) are formed is frozen through the hole formed in the segment (3') into the ground by a known freezing method. After 6), these bases (4) and (5) will be excavated.

Further, when building the tunnel (1), in the segment in which the tunnel lining part (3) is formed in the planned construction part of the enlarged tunnel part (2), the expandable segment (3) is formed at appropriate intervals in the tunnel length direction. 3a) is assembled in a ring shape, and a lubricant (18) is injected from an injection hole (not shown) formed at an appropriate position in the segment between the outer peripheral surface of the tunnel lining portion (3) and the ground.

As shown in FIG. 6, this telescopic segment (3a) has a pair of left and right segment pieces (3a ') (3a') arranged and fixed in one segment piece (3a '), and an intermediate push jack (7).
(7) is connected to the left and right directions (tunnel length direction) so as to be able to expand and contract, and a plurality of expanding and contracting segments (3a) configured in this way are provided at a plurality of positions of the tunnel lining part (3). A part of the lining portion is formed by assembling in a ring shape through the bolt connection hole (8) formed in the segment.

Therefore, when the bases (4) and (5) are excavated and formed, the telescopic segment (3a) of the base (4) (5) is pushed into the intermediate push jack (7).
By contracting in the lengthwise direction of the tunnel (1) by contracting, the segment of the desired tunnel length portion can be easily removed.

The expansion start base (4) has a concrete peripheral wall portion (4a) surrounding an excavation face plate (9) described later and a reaction force wall portion (4b) connected to the rear end of the peripheral wall portion (4a), On the inner peripheral surface of the front end of the peripheral wall portion (4a), there is provided a packing (11) which is in sliding contact with and adheres to the outer peripheral surface of the excavation face plate (9) and the expanded lining material (10) which will be described later. In (5), the inner peripheral surface of the front end of the peripheral wall (5a) is watertightly fixed to the outer peripheral surface of the tunnel lining outside the planned expansion area, and the inner peripheral surface of the rear end inner peripheral surface of the tunnel lining section in the planned expansion area ( A packing (12) is provided around the outer peripheral surface of (3) so as to be in sliding contact with and in close contact with the outer peripheral surface.

In this way, after forming the starting base (4) and the reaching base (5), the expanded lining (13) to be built on the starting base (4)
The excavation face plate (9) formed in a shape substantially equal to the outer peripheral shape of the tunnel arranging part is provided, and the front surface of the excavation face plate (9) is exposed to the excavation surface of the starting base (4). ) Contact the rear end surface.

The excavation face plate (9) has a central hole (14) approximately equal to the inner diameter of the tunnel lining portion (3), and the front surface around the central hole (14) of the segment (3 ') is as described above. The earth and sand intakes and the excavator (15) are brought into contact with the rear end surface and at a suitable interval in the circumferential direction on the plate surface portion projecting in the outward extension direction from the contact portion.
(See FIG. 3) is provided, and a blade opening (16) is provided on the outer peripheral edge so as to project forward.

In addition, the lining material (10) that constitutes the enlarged lining (13) is formed into a large ring shape by connecting segments of a certain size in the circumferential direction and the outer shape thereof is approximately equal to the outer peripheral shape of the excavation face plate (9). The enlarged lining material (10) is brought into contact with the outer peripheral portion of the rear surface of the excavation face plate (9), and the rear surface of the enlarged lining material (10) and the reaction force wall portion (4b) of the starting base (4). ) Intervening propulsion jacks (17).

Then, the excavator attached to the excavation face plate (9) (1
When the propulsion jack (17) is extended while rotating the cutter of 5), the excavation face plate (9) is propelled together with the expanded lining material (10), and the starting base (4) and reaching base (5) are in front of it.
Push the tunnel lining section (3) in between.

At this time, a lubricant (18) was placed between the tunnel lining section (3) and the ground.
Since it is filled with, the tunnel lining part (3) can be propelled by reducing the frictional resistance against the ground.

Further, the expansion and contraction segments (3a) arranged at a plurality of locations of the tunnel lining portion (3) are contracted in advance, or when the tunnel lining portion (3) is propelled and then pushed forward by the propulsion jack (17). When the space between the segment pieces (3a ′) (3a ′) of the telescopic segment (3a) is extended in the tunnel length direction by the extension of the intermediate push jack (7), the tunnel lining portion (3) to the arrival base (5) side is formed. ) Can be promoted smoothly.

In this way, the excavator (15) and the cutting edge (16) mounted on the excavation face plate (9) excavate the ground in front of the excavation face plate (9), and the excavation face plate (9) is propelled while the excavated soil plate is taken into the tunnel. 2) is excavated and formed, and the enlarged lining material (10) following the excavated face plate (9) is pressed into the excavation track while sliding the outer peripheral surface of the enlarged lining material (10) to the packing (11) to form the enlarged lining portion. To form.

At this time, when the promotion of the expanded lining material (10) for one element is completed, the next expanded lining material (10) is assembled and propelled by the segment assembly device (not shown) in the starting base (4). It is joined to the rear surface of the expanded lining material (10) in a polymerized state,
Hereinafter, similarly, the enlarged lining portions are sequentially joined and subsequently joined.
A lubricant (19) is injected from an injection hole (not shown) provided at an appropriate position in the foremost expanded lining material (10) between the outer peripheral surface of the expanded lining material (10) to be promoted and the ground.

On the other hand, the segment (3 ') of the existing tunnel lining part (3) on the arrival base (5) side arrives while being replaced with the expanded lining material (10) in accordance with the promotion of the expanded lining material (10). It is pushed into the base (5), disassembled by a segment dismantling device (not shown) arranged in the arrival base (5), and removed through the tunnel.

In this way, the segment (3 ') of the tunnel lining section (3) that reaches the arrival base (5) side in accordance with the promotion of the expanded lining material (10) from the start base (4) side is sequentially dismantled and removed,
When the excavation face plate (9) reaches the reaching base (5), the expanded lining material (10) joined in succession to the excavation face plate (9).
(10) ... (10) is used to build the enlarged lining (13) of the enlarged tunnel section (2) between the starting base (4) and the reaching base (5) (Fig. 5).

After construction of the expanded lining (13), the lubricant (19) filled between the outer peripheral surface and the ground is replaced by injecting a curable backing agent (20), and the excavation face plate (9) is disassembled, At the same time as removing it, remove the propulsion jack (17).

After that, concrete is placed on the inner surfaces of the peripheral walls of the starting base (4) and the reaching base (5) to form a continuous wall surface (21) on the inner surface of the expanded lining (13).

In the above examples, the construction of the circular expanded lining (13) which is eccentric to one side with respect to the existing tunnel (1) is illustrated, but the expanded lining of concentric circles and the shape are different. Of course, the expanded lining can be constructed by the above method.

〔The invention's effect〕

As described above, according to the tunnel expansion lining method of the present invention,
An expansion start base and an arrival base are excavated and formed at both ends of the expansion planned area of the existing tunnel lining, and an excavation face plate having substantially the same outer peripheral shape of the expansion lining to be built at the extension start base is provided. The front surface of the expanded lining material is brought into contact with the rear end portion of the existing tunnel lining exposed at the expansion starting base, and the expanded lining material of one element is arranged on the rear surface of the outer peripheral portion, and the rear surface of the expanded lining material is the propulsion device. Since it is pushed by, the existing tunnel lining part of the expansion planned area is totally buried in the ground without being dismantled and propelled to the arrival base side, so it is possible to intrude into the tunnel such as groundwater. It is possible to smoothly and efficiently perform the formation of the enlarged tunnel portion by the excavation of the excavation face plate and the enlarged lining by the promotion of the enlarged lining material while reliably preventing the existing tunnel lining portion.

Furthermore, since the existing tunnel lining section that has reached the expanded arrival base by promotion is to be removed within the arrival base, without moving the dismantling device of the tunnel lining segment,
The lining segment of the existing tunnel can be dismantled and removed in a fixed state.

[Brief description of drawings]

The drawings show an embodiment of the present invention. Fig. 1 is a cross-sectional plan view of a tunnel in an enlarged planned area, Fig. 2 is a vertical sectional side view showing a state in which the enlarged tunnel is started to be constructed, and Fig. 3 is an excavated face plate portion. FIG. 4 is a simplified vertical sectional front view, FIG. 4 is a vertical sectional side view of an enlarged tunnel portion under construction, FIG. 5 is a longitudinal sectional side view of a built enlarged tunnel portion, and FIG. 6 is a perspective view of a telescopic segment. (1) …… Existing tunnel, (2) …… Enlarged tunnel section,
(3) …… Tunnel lining section, (3 ′) …… Segment,
(3a) …… Expansion / contraction segment, (4) …… Expansion start base,
(5) …… Expansion arrival base, (9) …… Excavation face plate, (10)
…… Expanded lining material, (13) …… Expanded lining, (17) …… Propulsion jack.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshiaki Iwada 1-3-10 Moto-Akasaka, Minato-ku, Tokyo Okumuragumi Co., Ltd. Tokyo branch office (72) Toshio Izawa 2nd Sanbancho, Chiyoda-ku, Tokyo Tobishima Construction company (72) Inventor Kenichi Matsushima 2-3 Sanbancho, Chiyoda-ku, Tokyo Toshima Construction Co., Ltd. (72) Inventor Taro Kasuya 2-3-5 Misaki-cho, Chiyoda-ku, Tokyo Steel Construction Co., Ltd. In-company (72) Inventor Shigeru Matsuoka 2-5-3 Misaki-cho, Chiyoda-ku, Tokyo Inside Iron Construction Co., Ltd. (56) Reference JP 59-102086 (JP, A) JP 62-133292 ( JP, A) JP 61-242297 (JP, A)

Claims (2)

[Claims] 1. An expansion starting base is excavated on one side of the removal mark and an expansion starting base is formed on one side of the removal mark by removing both end linings in an expansion planned area of an existing tunnel lining constructed by the shield construction method, and then expanded. An excavation face plate that is approximately equal to the outer peripheral shape of the expanded lining to be built at the starting base is provided, and the front surface of the excavation face plate is brought into contact with the rear end face of the existing tunnel lining exposed at the expansion starting base and at the rear face of the outer peripheral portion. One element of the expanded lining material is arranged, and then the rear surface of the expanded lining material is pressed by a propulsion device to expand the existing tunnel lining in the planned expansion area via the expanded lining material and excavation face plate. While pushing the ground to be expanded forward by the excavation part of the excavation face plate protruding outward from the rear end of the existing tunnel lining while pushing it toward the arrival base side, take it into the starting base.
The propulsion device is installed by removing the existing tunnel lining portion that has reached the expansion reaching base by propulsion in the arrival base and arranging the next expansion covering material in contact with the rear surface of the expansion covering material in the starting base. According to the method described above, an expanding lining method for a tunnel is characterized in that the expanding part is constructed with the expanding lining material over the entire length of the expansion planned area by repeating this work. 2. The expanded lining of a tunnel according to claim 1, wherein segments which expand and contract in the tunnel direction are arranged at appropriate intervals in the tunnel length direction in the existing tunnel lining in the expansion planned area. Method.