JPS5921897A - Expansion shiled excavation method - 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 The present invention relates to an enlarged shield excavation method for cutting and forming a locally enlarged tunnel portion in a part of a tunnel.

Generally, when building a station etc. on a subway, etc.,
It is necessary to provide an enlarged section in a part of the tunnel.

Conventionally, the method for enlarging a tunnel is to use the shield method to excavate a tunnel of normal diameter, and when the area to be expanded is reached, an enlarged blade section is added to the cutter head of the shield machine, and the cutter head is used to continue shielding. In some construction methods, after enlarging an area to be enlarged, the enlarging blade is removed and a tunnel of normal diameter is excavated again.

However, in this construction method, the shield machine excavates both the normal diameter tunnel and the enlarged section, which has the disadvantage of being inefficient and prolonging the construction period.

Another conventional construction method is to excavate a tunnel of normal diameter, then construct a shaft from the ground in the area planned for expansion. .

However, this method has the disadvantage that the excavated shaft must be filled in with only a small manhole remaining after the enlarged part is created, which requires a large amount of cost and time.

The present invention was made to eliminate these drawbacks of the conventional method, and it does not impede the efficiency when excavating a tunnel of normal diameter (in addition, it is possible to excavate an enlarged part of a tunnel in a short time and at low cost). The purpose of the present invention is to provide an expansion shield drilling method that allows for

The present invention will be described below based on embodiments shown in the drawings.

Figures 1-2 show an enlarged shield excavation rig for use in the method of the invention, which rig is installed on the outer surface of a partial segment 1 forming a small 4-diameter tunnel T1. At least one traveling trolley 2, a cylindrical seal 3 that is carried by the trolley 2 and excavates an enlarged tunnel T2 around the primary segment 1, and is attached to the inner peripheral surface of the enlarged tunnel T2. The shield 3 is mounted on the truck 2 in order to obtain a reaction force from the secondary segment 4 and propel the shield 3 (to seal between the pulled jack 5 and the outer surfaces of the truck 2 and the primary segment 1). A sealing member installed between the trolley 2 and the shield 3 in order to seal between a sealing member such as a rubber seal 6 and an air bag-shaped air seal 7 attached to the lower part of the trolley 2 and the inner surfaces of the trolley 2 and the shield 3. A crushing machine 10 is installed on the advancing side of the truck 2 and crushes the face 9.

The small diameter tunnel T+ is formed in advance by a conventional shield construction method.

Further, the rubber seal 6 slides on the primary segment 1 when the truck 2 moves forward, and the air seal 7 separates from the primary segment 1 by removing air when the truck 2 moves forward.
When the truck 2 stops, it is filled with air again and comes into close contact with the primary segment 1 again. In addition, the shield 3
A sliding seal 11 is attached to the rear end of the shield 3 to seal the space between the shield 3 and the secondary segment 4.

Furthermore, the primary segment 1 has a hexagonal bolt mounting hole (
(not shown), a muddy water population 12 and a muddy water outlet 13 are provided. Such muddy water inlet 12 and muddy water outlet 13
can also be provided on the partition wall 8 of the expanded shield drilling equipment A, as shown in FIG. From the muddy water population 13, muddy water is injected to the face 9 side.

On the other hand, although the crushing device 10 is a fresh water jet spraying device in the embodiment of the present application, it can be replaced with a mechanical rotary cutter.

According to an example of the method of the present invention, first, the expansion shield excavation device is placed at the starting end of the expansion tunnel T2 by an arbitrary method, muddy water is injected from the muddy water population 12, and while the crushing device 10 is operated, the jack 5 The truck 2 is moved forward to excavate the face 9, thereby forming an enlarged tunnel T2 in a part of the small diameter tunnel T1. At this time, the excavated face 9 is pushed out from the muddy water outlet 13 into the tunnel T1 or T2.

In addition, when the face 9 is on extremely soft ground, it is not necessary to provide the muddy water population 12 and the crushing device 10 is also unnecessary, and the soft face 9 is simply pressed by the partition wall 8. It can be taken out into the tunnel T1 or T2.The face or sand that has entered the tunnel is removed by means of conventional conveying equipment.

If the face 9 is somewhat hard, muddy water is injected from the muddy water population 12 to soften it and push it into the tunnel using the partition wall 8. If the face 9 is even harder, the crushing device 10 is attached to the cart 2 and The cutting blade 9 is made sufficiently soft by the crushing device 10.

As is clear from the description of the above embodiments, the present invention forms an enlarged tunnel using an enlarged shield excavation device that excavates on the outer surface of the primary segment for small diameter tunnels. Construction can be carried out independently from the tunnel construction,
Work efficiency can be improved. In addition, there is no need to provide a vertical shaft in a tunnel with a normal diameter, and it is only necessary to secure a space in which the expanded shield excavation device can fit in a part of the normal diameter tunnel, so that costs and construction period can be significantly reduced.

[Brief explanation of the drawing]

FIG. 1 is a schematic longitudinal sectional view of an enlarged tunnel section showing an embodiment of the method of the present invention, FIG. 2 is a left side view with a part of FIG. 1 omitted, and FIG. 3 is a modification of FIG. 2. FIG. [Explanation of symbols] A... Expanding shield excavation device T1... Small diameter tunnel T2... Expanding tunnel 1... Primary segment 2... Trolley 3... Shield 4... Secondary segment 5・・・Jyatsuki 6・
・・Rubber seal 7・Air seal 8・
...Partition wall 9...Face 10...Crushing device 11...Sliding seal 12...Muddy water population 13...Muddy water outlet 0- Figure 1 Figure 2 Figure 3 Procedure amendment book 1982 October 26th, 2015 Mr. Kazuo Wakasugi, Commissioner of the Japan Patent Office, Indication of the case Patent application No. 571301, Title of the invention
Relationship with the person who performs expansion shield drilling power Pope Patent applicant Mitsui 3-10-1 Iwamoto-cho, Chiyoda-ku, Tokyo
Construction Co., Ltd. President and CEO Town 1) Target of Ryoji Burial King (Amendment of the full text of the description) Akegishi ``Book 1 (Amendment of the full text) 1. Expansion of the name of the invention Shield drilling method 2. Partial amendment of the scope of claims An expansion shield excavation device is installed at the starting end of the area to be expanded in the small diameter tunnel where a While injecting muddy water and injecting water onto the face from a jet injection device installed on the expanding shield drilling device, the expanding shield drilling device is propelled along the outer periphery of some of the segments, and the excavated soil that has become muddy is sequentially removed. An enlarged shield excavation method characterized by creating an enlarged excavation section so as to be taken into the tunnel. 3. Detailed description of the invention The present invention provides a method for creating a locally enlarged tunnel section in a part of a small diameter tunnel. This article relates to an expanded shield excavation method in which the front face side is filled with muddy water and the face is excavated by a jet of water.Generally, it is used for subway construction and underground cable installation work. The shield method is often used as an excellent construction method for excavating tunnels for underground construction, but in order to construct a subway station or create an underground cable connection workshop, it is necessary to enlarge a part of the tunnel. Conventional methods for carrying out this expansion work include, for example, digging a vertical shaft in each area planned for expansion, or adding an enlarged blade to the cutter head of a shield machine once the area planned for expansion is reached. However, in recent years, the method of digging vertical shafts has become difficult to implement in view of the fact that tunnel construction routes have become deeper underground due to restrictions from various aboveground and underground obstacles in urban areas. In addition, there was a problem in terms of cost, as the vertical shaft that had been excavated had to be backfilled except for a part after the enlargement work. In the adding method,
If the enlarged excavation diameter becomes large, it will not be able to resist the earth pressure from the surrounding surface, so the excavation diameter will be limited, and it will not be possible to excavate a normal diameter (small diameter) tunnel and excavate the enlarged section at the same time. Since the enlarged blade part must be attached and detached each time, there are problems such as a decrease in efficiency. Therefore, in a previous application, the applicant proposed a tunnel excavation method that improves these conventional methods. According to the construction method proposed earlier, an expanded excavation section is established at the starting end of the planned expansion area in the tunnel where the -next segment (shield) is installed, and this is the starting point for the enlarged shield machine, and this is the outer circumference of the -next segment 1~. An expansion shield machine is installed that propels the tunnel in the axial direction along Proceed to apply the next segment. This improves the drawbacks of the conventional method and improves the normal diameter (
We have provided a new expansion shield excavation method that enables work to be carried out in parallel with tunnel excavation (small diameter), and that allows excavation of enlarged sections in a short time and at low cost. The present invention is a development of the above-mentioned invention, in which muddy water is injected into the front face side which is closed by a partition wall and a seal member provided on the expansion shield drilling equipment, and a jet is also provided on the expansion shield drilling equipment. The purpose of the present invention is to provide an expanded shield excavation method for creating an expanded excavation section by jetting water from an injection device to the front face side while spreading water to the outer periphery of the next segment and propelling the expanded shield excavation device. An embodiment of the present invention will be described below based on the drawings. Figures 1 and 2 show an enlarged shield drilling rig @A for use in the method of the invention, which rig A is driven inside so as to run over the outer surface of a partial segment 1 forming a small diameter tunnel T+. an inner cylinder 2 provided with a roller, an outer cylinder 3 provided with a cutting edge at the tip that cooperates with the inner cylinder 2 to excavate an enlarged tunnel T2 around the second segment 1; The outer surface of the inner cylinder 2 and the secondary segment 1 is sealed between a jack 5, which is provided with several bolts so as to propel the outer cylinder 3 by obtaining a reaction force from the secondary segment 4 attached to the inner peripheral surface, and the outer surfaces of the inner cylinder 2 and the secondary segment 1. In order to seal between the inner surfaces of the inner cylinder 2 and outer cylinder 3, a sealing member such as a rubber seal 6 and an air bag-shaped air seal 7 attached to the lower part of the inner cylinder 2 is used. and a sealing partition wall 8 installed to connect the outer cylinder 3, and a jet injection device 10 that injects fresh water at high pressure from a nozzle attached to the advancing side of the inner cylinder 2 to crush the face 9. Equipped with The small diameter tunnel T+ is formed in advance by a conventional shield construction method. Further, the rubber seal 6 partially slides on the segment 1 when the inner cylinder 2 moves forward, and the air seal 7 partially slides on the segment 1 when the inner cylinder 2 and the outer cylinder 3 move forward. When the inner cylinder 2 is stopped, it is filled with air again and comes into close contact with the Mσ-order segment 1. Further, in order to seal the space between the outer cylinder 3 and the secondary segment 4, a sliding seal 11 is attached to the rear end of the outer cylinder 3. Furthermore, the second segment 1 has a hexagonal bolt mounting hole (
A muddy water inlet 12 and a muddy water outlet 13 are provided using a pipe (not shown). Such muddy water population 12 and muddy water outlet 13
can also be provided on the partition wall 8 of the expanded shield drilling equipment A, as shown in FIG. From the muddy water population 13, muddy water is injected into the face 9 side to prevent collapse. According to an example of the method of the present invention, first, the expansion shield excavation device A is placed at the starting end of the expansion tunnel T2 by an arbitrary method, the jack 5 is extended to make the tip of the outer cylinder 3 protrude into the ground, and the muddy water is removed. While injecting muddy water from the population 12, the jet injection device 10 is operated to turn the ground in front of the ground into mud, while the inner cylinder 2 is partially advanced along the outer periphery of the segment 1 by the jack 5, while excavating the face 9. Then, an enlarged tunnel T2 is created in a part of the small diameter tunnel T1. In addition, the excavated soil that has become muddy is sequentially pushed out from the muddy water outlet 13 into the tunnel "1" or "T2", and is discharged out of the tunnel by a pump similar to the known muddy water type shield L method, or the soil and water are separated and the water is drained. It can be used again as pressurized water for the face.As is clear from the description of the above embodiments, the present invention can be used to create an enlarged tunnel using an enlarged shield drilling device that excavates on the outer surface of some segments for a small diameter tunnel. As a result, construction work can be carried out separately and independently from the construction of small diameter tunnels, that is, normal diameter tunnels, and work efficiency can be improved.In addition, there is no need to provide a vertical shaft for normal diameter tunnels, and Since it is only necessary to secure a space in a part of the diameter for the expansion shield drilling equipment to fit into, the cost and construction period can be significantly reduced. Due to its structure that can withstand muddy water and dirt, there is less chance of the face collapsing even on soft ground, and since the face side is closed, workers can work safely from the rear, and no human power is required for excavation and removal of shear. 4. Brief Explanation of the Drawings -7-(.6- Figure 1 is a schematic vertical cross-sectional view of an enlarged tunnel section showing an embodiment of the method of the present invention, and Figure 2 is a schematic longitudinal sectional view of the enlarged tunnel section showing an embodiment of the method of the present invention. A partially omitted left side view and FIG. 3 are explanatory diagrams of a modification of FIG. 2. [Explanation of symbols] A... Expanding shield excavation device T1... Small diameter tunnel T2... Expanding tunnel 1...-Next segment °2...Inner cylinder 3...Outer cylinder 4
...Secondary segment 5...Jackie 6...
・Rubber seal 7...Air seal 8...
・Partition wall 9... Face 10... Jet injection 11... Sliding seal 12... Muddy water population 13... Muddy water outlet') 7L-8-

Claims (5)

[Claims] (1) A truck that runs on the surface of the primary segment forming a small diameter tunnel, a cylindrical shield that is carried by the truck and excavates an enlarged tunnel around the primary segment, and the expanded tunnel. 2 attached to the inner surface of
A jack that propels the shield by obtaining a reaction force from the next segment, and a sealing member attached to the lower part of the truck and the inner surfaces of the truck and the shield to seal between the surfaces of the truck and the primary segment. In order to seal the area, an expanded shield excavation rig equipped with the trolley and a sealing partition wall installed between the shields is placed at the starting end of the expanded tunnel, and an earthwork is installed on the primary segment or the partition wall of the expanded shield excavation rig. An expanding shield excavation method, characterized in that an expanding tunnel is formed by opening an exit and advancing the expanding shield excavating device toward a face side. (2) a trolley that runs on the outer surface of the primary segment forming a small diameter tunnel; a cylindrical shield that is carried by the trolley and excavates an enlarged tunnel around the primary segment; 2 attached to the inner surface of the tunnel
A jack that propels the shield by obtaining a reaction force from the next segment, and a seal member attached to the lower part of the truck to seal between the surface of the truck and the primary segment, and a seal member that seals between the truck and the inner surface of the shield. In order to seal the tunnel, an enlarged shield excavation rig equipped with the trolley and a sealing partition wall installed between the shield is placed at the starting end of the enlarged tunnel, and a mud water inlet is provided at the primary segment or the partition wall of the enlarged shield excavation rig. and an expanded shield excavation method, characterized in that an expanded tunnel is formed by opening a muddy water discharge port and moving the expanded shield excavation device toward the face while injecting muddy water from the muddy water inlet into the face. (3) A truck that runs on the outer surface of the primary segment forming a small diameter tunnel, a cylindrical shield that is carried by the truck and excavates an expanded tunnel around the primary segment, and the expanded shield tunnel. a jack for propelling the shield by obtaining a reaction force from a secondary segment attached to the inner surface of the carriage; and a sealing member attached to the lower part of the carriage for sealing between the outer surface of the carriage and the outer surface of the primary segment 1. and a sealing partition wall installed between the trolley and the shield in order to seal between the inner surfaces of the trolley and the shield, and a crushing device attached to the advancing side of the trolley for crushing the face. An expanded shield drilling device is arranged at the starting end of the expanded tunnel, and a muddy water inlet and a muddy water discharge port are provided in the primary segment or the partition wall of the expanded shield drilling device, and muddy water is injected into the face from the muddy water inlet and the pulverization is performed. An expanding shield excavation method, characterized in that an expanding tunnel is formed by advancing the expanding shield excavating device toward the face while crushing the face with the device. (4) The method according to claim 3, wherein the crushing device is a fresh water jet spraying device. (5) %) The method according to claim 3, wherein the frame device is a rotary cutter.