JPH1077783A - Shield tunnel regeneration construction method, device thereof, and segment for the construction method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To remarkably improve the life of an existing shield tunnel by constructing in order primary linning for new regeneration, while excavating the outer circumferential part of a superannuated existing shield tunnel with a shield machine for regeneration. SOLUTION: A starting vertical shaft 1 is excavated at an existing shield tunnel 2, a shield machine 3 for regeneration is assembled so as to surround the tunnel 2, an entrance packing 5 is on a pit mouth part and a reaction wall 6 is on the opposite side respectively set, and the shield machine 3 is propelled by a propulsion device 7 so as to assemble in order segments 4 for regeneration. A motor-driven ring-like rotary face disc is mounted on the front of the shield machine 3 so as to excavate by means of cutter bits. The segment 4 is provided with many hollow round tubes previously burried therein so as to be used for mud feed/discharge tubes, a mortar injecting tube, piping for power line, and the like, and the segment 4 is provided with projections on the inside so as to prevent it from plane-contacting with existing segments. Consequently, without interrupting the use of the superannuated existing tunnel 2, the life can be remarkably increased.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for reproducing a shield tunnel and a segment used for the method and apparatus.

[0002]

2. Description of the Related Art Shield tunnels have been increasingly constructed in Japan since the 1950's for sewerage, water supply, electric power, communication, and subway use. The waterproof material of these shield tunnels has been used mainly from butyl rubber from the beginning. However, the waterproofing with the waterproofing material is not perfect, and a secondary lining has been used as a means to supplement it.

[0003] Thereafter, waterproof materials have been gradually improved, and in recent years, water-swellable rubber has been used as a mainstream, and there is a situation in which there is no construction section where almost complete waterproofing is performed.

[0004]

However, it is difficult to say that the long-term stability of these waterproof materials is not always sufficiently clear, and the possibility of water leakage in the future cannot be denied. In addition, the shield tunnels that were built in the past caused a new leak due to the recovery of the groundwater level and the accompanying increase in the groundwater pressure due to the regulation of the pumping of groundwater. Some situations are seen.

[0005] On the other hand, although the durability of reinforced concrete structures is not clear, it is generally said that it is around 100 years, but some sewer tunnels and railway tunnels constructed in the past have already passed for a long time after construction. Some of them are
Aging of the reinforced concrete segment, which is the primary lining, will become a major problem in the future. The useful life of concrete segments is unknown, as is the case with ordinary concrete structures.However, many concrete structures have already passed their useful lives and have been demolished. This situation is obvious.

[0006] For this reason, the construction of a new tunnel on another route instead of the deteriorated tunnel is necessary for improving the efficiency of land use while the underground structure is already buried under extreme congestion. Even so, it is assumed that construction costs will be too high, and it will be difficult to secure land for tunnel construction. In view of such a reality, it is expected that a technology for regenerating while utilizing the existing tunnel will be needed in order to maintain the mission and functions of the existing tunnel for a longer time.

The present invention solves the above-described problems of the existing shield tunnel, and a new primary cover for reproduction is provided on the outer periphery of the existing tunnel without impairing the function currently performed of the existing shield tunnel. The purpose of this project is to significantly increase the service life of existing shield tunnels by installing construction materials.

[0008]

In order to achieve the above object, according to the shield tunnel regeneration method of the present invention,
A starter shaft for a regenerative shield machine is constructed in a section of the existing shield tunnel, and a new regenerative shield machine is installed to wrap the outer circumference of the existing shield tunnel from the start shaft, and a regenerative shield is installed. Assemble a new primary lining for regeneration at the rear of the machine, promote the primary lining for regeneration, and excavate the outer periphery of the existing shield tunnel with the shielding machine for regeneration. A new primary lining for regeneration is constructed on the outer periphery of an existing shield tunnel to regenerate the existing shield tunnel.

Further, according to the shield tunnel regeneration method according to the present invention, in the above shield tunnel regeneration scheme, in a shield machine provided with a ring-shaped skin plate wrapping an outer periphery of an existing shield tunnel, a circumferential direction is provided in front of the shield machine. In addition to being equipped with a rotary excavator that rotates and excavates earth and sand, it also has an earth discharging mechanism consisting of a sending and discharging pipe and an agitator that carries the excavated earth and sand to the outside of the mine by a fluid transport device. .

[0010] Further, the construction method segment according to the present invention may further comprise a fluid transporting mud pipe for excavating and transporting excavated earth and sand along a tunnel axial direction inside the regeneration primary lining segment in the shield tunnel regeneration shield machine. A mud pipe, a sliding material injection pipe, a backing injection pipe, and a mortar injection pipe are buried in advance, and a frictional force with an existing segment is reduced on the inner surface of the regenerated primary lining segment, and deformation of the existing segment is prevented. Are further provided, and an inter-ring joint and an inter-segment joint are provided on the outer peripheral surface of the segment.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings showing the most preferred embodiments of the present invention. Fig. 1 shows the construction of a rehabilitating shield shaft for starting a rehabilitation shield machine 1 in a section of an existing shield tunnel 2 in order to construct a rehabilitation primary lining in an existing shield tunnel. 3 shows a vertical state of a tunnel that penetrated No. 3 into the ground.

[0012] The starting shaft 1 is an existing shield tunnel 2.
In order not to impair the function, the ground is preliminarily improved around the area by a chemical injection method or the like, and the surrounding area is constructed by an excavation method or the like. that time,
Since the existing tunnel in the shaft is exposed, reinforcement will be implemented so that the tunnel will not be damaged if exposed. To start the regenerative shield machine 3, after assembling the regenerative shield machine 3 so as to surround the existing shield tunnel 2 in the start shaft 1, the ground improvement is performed at the wellhead in the same manner as the known shield machine starts. Ground improvement for starting protection by chemical injection method and the like, and installation of entrance packing 5 and the like are performed.
At this time, a reaction wall 6 for receiving the propulsion reaction force of the regenerative shield machine 3 is installed on the earth retaining wall opposite to the wellhead, and the reaction wall 6 starts in the same manner as the known propulsion method. It receives the reaction force generated at the time of propulsion of the shield machine propulsion device provided in the shaft 1.

By extending the propulsion device, the reproducing shield machine 3 is advanced, and thereafter, while assembling new reproduction segments sequentially in a space created by retracting the propulsion device, this operation is repeated. , And to promote the reproduction shield machine. In the embodiment shown in FIG. 1, the shield machine is propelled to the left from the starting shaft 1. However, the shield machine may be started in both the left and right directions from the shaft in the same manner as the known shield method and propulsion method.

FIG. 2 shows a situation in which the shield machine for reproduction is propelled to some extent and a segment for reproduction is partially constructed, and FIG. 3 is a view taken in the direction of arrows AA in FIG. FIG.
FIG. 5 is a vertical sectional view of the reproducing shield machine 3, and FIG. A ring-shaped face plate 9 or a spoke that rotates in the circumferential direction is provided on the front surface of the reproducing shield machine 3, and a cutter bit 1 installed on the face plate 9 is provided.
With 0, the ground is cut in the same way as a normal shield machine.
In order to rotate the face plate 9 or the spoke in both the left and right directions, a plurality of cutter driving motors 12 are installed on the circumference. In the figure, reference numeral 11 denotes a skin plate.

Further, between the cutter driving motor 12, a mud pipe 13 for carrying out the excavated earth and sand by fluid transportation,
A plurality of sludge pipes 14 and a plurality of agitators are provided, respectively, so that the face can be stably held and the excavated earth and sand can be carried out by a mechanism similar to the known muddy water shield method. Further, a plurality of tail seals 15 which are the same as the tail seals of the known shield machines are provided at a plurality of stages on the contact surface between the existing shield tunnel 2 and the inside of the shield machine 3 for reproduction, whereby muddy water in the chamber is reduced. It prevents leakage to the rear. On the other hand, the main reproduction shield machine 3
Is not equipped with a shield propulsion jack, which is provided in a normal shield machine, in order to propell with a main pushing device provided in a part of the starting shaft.

FIG. 6 shows a regeneration segment 4 used in the present construction method. In the segment 4, a ring is divided into several pieces similarly to a known RC segment. And a bolt box portion installed on the outer peripheral surface of the segment, which is connected by bolts. A hollow circular tube is embedded in this segment in advance, and when the segment is assembled, this circular tube is connected in the axial direction of the tunnel, and the shield start shaft 1
Then, the chamber chamber of the regenerative shield machine penetrates through this circular tube. (See FIG. 7) A number of these pipes having a required inner diameter are installed according to the purpose of use, and a mud feeding pipe 13 and a mud discharging pipe 14 necessary for fluid transport of excavated earth and sand, a back filling injection pipe, a segment, and the like. Lubricant injection pipe for reducing the frictional force between the ground and the regeneration segment during propulsion, mortar injection pipe 19 for mortar filling the gap between the regeneration primary lining and the existing primary lining, and the power line of the shield machine Used as an installation space. Of these, the back mortar injection pipe and the lubricant injection pipe 18 have their ends penetrated not into the chamber of the shield machine chamber but through the ground surface outside the regeneration segment. (See FIG. 8) Also, the mortar injection pipe 19 has the tip of the pipe penetrated through the existing tunnel surface inside the regeneration segment 4. (See FIG. 9) Further, at the time when the construction of the regeneration segment 4 is completed, these pipes are reinforced with reinforcing steel or the like as necessary and filled with mortar to increase the strength of the regeneration segment 4 body. Shall be.

Further, several projections 20 are provided inside the reproduction segment 4, and each of the projections 20 prevents the reproduction segment 4 from coming into surface contact with the existing segment when the reproduction segment 4 is assembled. By doing so, the frictional force between the reproduction segment 4 and the existing segment can be almost eliminated. As a result, the propulsive force of the shield machine can be reduced, and long-distance propulsion can be performed with a small-scale propulsion facility. Further, movement and deformation of the existing segment can be restrained by the reproduction segment 4 by the projection 20, and damage to the existing segment when the reproduction segment 4 is constructed can be prevented.

[0018]

According to the present invention, as described above, a starting shaft of a regenerative shield machine is installed in a certain section of an existing shield tunnel, and a new rehabilitation tunnel is wrapped around the existing shield tunnel. Establish a new primary lining outside the existing shield tunnel by installing a shield machine, installing a regenerative shield machine, and constructing a new regenerative primary lining at the rear of the regenerative shield machine As a result, the lining member can be regenerated, and the service life of the tunnel can be increased.

Further, since the recycled primary lining is superposed on the existing lining member and resists external pressure as a whole, the strength of the entire lining is increased, and the earthquake resistance is improved. Furthermore, according to the present invention, a complete water leakage prevention measure can be achieved without losing the inner cross section of the existing tunnel, for example, by constructing a secondary lining inside the tunnel. According to the invention of claim 2, a rotary excavator is provided on the front surface of the shield machine provided with a ring-shaped skin plate wrapping the outer periphery of the existing shield tunnel in the shield tunnel regeneration method, and the excavator has a circumferential shape. By excavating the earth and sand by rotating in the direction, and excavating the excavated soil out of the pit by a fluid transport device such as a mud pipe, an agitator, etc. Complete measures to prevent water leakage can be made without delay.

When the existing lining member is removed after the primary lining is constructed, the cross section inside the tunnel is enlarged, and the function of the tunnel is improved. According to the third aspect of the present invention, a recycling shield is preliminarily buried along a tunnel axis in a primary lining segment for reclaiming, and a feeding / discharging pipe, a lubricating material, and a backing material injecting pipe for carrying out excavated earth and sand are previously buried. The excavation work is efficiently performed by the machine, and the protrusions provided on the reclaimed primary lining segment prevent frictional deformation with the existing segment, thereby preventing deformation of the existing segment.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing the construction of a starting shaft of a shield machine for reproduction.

FIG. 2 is a cross-sectional view showing the state of propulsion of the reproducing shield machine.

FIG. 3 is a view taken on line AA of FIG. 2;

FIG. 4 is an enlarged sectional view of a main part of FIG. 2;

FIG. 5 is a BB view of FIG. 4;

FIG. 6 is a perspective view of a reproduction segment.

FIG. 7 is a vertical cross-sectional view showing a mounting state of a reproduction segment.

FIG. 8 is a cross-sectional view showing a situation in which a lubricant is injected from the segment shown in FIG. 7;

FIG. 9 is a cross-sectional view showing a mortar injection state from the segment shown in FIG. 7;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Starting shaft 2 Existing shield tunnel 3 Reproduction shield machine 4 Reproduction segment 5 Entrance packing 6 Reaction wall 7 Propulsion device 8 Soil wall 9 Face plate 10 Cutter bit 11 Skin plate 12 Cutter driving motor 13 Mud pipe 14 Discharge Mud pipe 15 Tail seal 16 Joint between rings 17 Joint between segments 18 Back mortar injection pipe and lubricant injection pipe 19 Mortar injection pipe 20 Projection

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Sadao Kimura 4-12-20 Nihonbashi Honcho, Chuo-ku, Tokyo Inside Sato Kogyo Co., Ltd.

Claims (3)

[Claims] 1. A starting shaft for a regenerative shield machine is constructed in a section of an existing shield tunnel, and a new regenerative shield machine is installed so as to wrap the outer periphery of the existing shield tunnel from the starting shaft. , A new primary lining for reproduction was assembled at the rear of the shield machine for reproduction,
While promoting the primary lining for regeneration, while excavating the outer periphery of the existing shield tunnel with the shield machine for regeneration, a new primary lining for regeneration is sequentially assembled and a new one is formed on the outer periphery of the existing shield tunnel. A method for regenerating a shield tunnel, comprising constructing a primary lining for regeneration and regenerating the existing shield tunnel. 2. In the shield tunnel regeneration method, in a shield machine having a ring-shaped skin plate wrapping the outer periphery of an existing shield tunnel, the shield machine is rotated in the circumferential direction in front of the shield machine to excavate earth and sand. A rotary excavator is provided, and a sending and discharging pipe that carries excavated earth and sand to the outside of the pit by a fluid transport device,
A shield tunnel regenerating device comprising an earth discharging mechanism comprising an agitator. 3. In the shield tunnel regeneration shield machine, inside the segment for primary lining for regeneration, a mud pipe, a mud pipe, a slip material injection pipe, a back pipe for fluid transport for excavating earth and sand along the tunnel axis direction. Injection pipe, and mortar injection pipe is buried in advance, and while reducing the frictional force with the existing segment on the inner surface of the regeneration primary lining segment,
A segment for a shield tunnel regeneration method, comprising a projection for preventing deformation of an existing segment, and further comprising an inter-ring joint and an inter-segment joint installed on an outer peripheral surface of the segment.