JPH0291393A - Shield drilling machine - Google Patents

Abstract

PURPOSE:To properly support a ground with a joint plate and an external ring, and prevent the collapse of a ground by providing a cutter head with the external ring having a plurality of joint plates in a peripheral direction, and installing a pressing jack device on a shield body for projecting the joint plates toward the front of a cutter blade. CONSTITUTION:After two shield drilling machines are docked to each other after drilling from both sides, a jack device 12 fitted to a shield body 1 is operated and the joint plate 8 of an external ring 7 is projected toward the front of a cutter blade, thereby being kept in contact with the external ring 7 of the other shield drilling machine. Furthermore, after a ground is improved and facilities behind the shield drilling machines are disassembled, the external ring 7 and the joint plate 8 projected therefrom are welded, and the joint plate 8 and the external ring of the other machine in contact therewith are welded to each other. According to the aforesaid construction, it is possible to ensure the prevention of the collapse of a ground and safety for a worker.

Description

Detailed Description of the Invention: Industrial Field of Application This invention relates to a shield excavator used for excavating large-diameter tunnels in an underground docking method in which two shield excavators that advance by excavating from both sides are docked in the middle. .

Conventional technology Generally, when excavating a side tunnel with a shield tunneling machine,
Generally, the shield tunneling machine is started from one starting shaft and the tunnel excavation is completed at the other arrival shaft. However, when it is not possible to secure a site for a shaft midway, such as on the ocean floor or at great depth, shield tunneling machines 23.
Excavation started at 24, and both shields were excavated in the middle part fi23.
An underground docking method will be adopted in which the tunnel is connected by docking 24.

In this underground docking method, at the docking position where the shield excavation is 5%23.24, the ground around the shield excavator 23.24 is frozen, and the ground is improved by chemical injection to prevent groundwater seepage and ground collapse. After that, the shield tunneling machine was dismantled and the lining and other connection work was carried out.

Problems to be Solved by the Invention Complete ground improvement is difficult when excavating large-diameter tunnels with deep earth cover and high earth pressure and water pressure using only the conventional ground improvement methods described above, such as freezing and chemical injection. There was a risk of mountain collapse, making it difficult to ensure the safety of workers.

The present invention solves the above problems, and even when excavating large-diameter tunnels with deep earth cover and high earth pressure and water pressure using the underground docking method, it is possible to reliably prevent ground collapse and ensure the safety of workers. The purpose is to provide a shield tunneling machine.

Means for Solving the Problems In order to solve the above problems, the present invention provides a cutter head that is rotatably supported at the front of the shield body, and a plurality of bonding plates that can move in and out toward the front of the face in the circumferential direction. The shield body is provided with an outer circumferential ring, and the shield body is provided with a push-in jack device that causes the joint plate to protrude to the front surface of the face.

Operation In the above configuration, after docking the two shield excavators excavating from both sides, the jacking device of one shield excavator is activated, and the joint plate of the outer ring is projected toward the front face of the face, and the other shield excavator excavates. Place it in contact with the outer ring of the machine. Then, the ground in the docking area was frozen to improve the ground, and the rear equipment of the shield tunneling machine was dismantled, and then the outer ring and the joint plate protruding from this outer ring were welded, and the joint plate was brought into contact with the outer ring. Weld it to the outer ring of the other shield tunneling machine.

In this way, since the ground at the docking portion is supported by the joint plate and the outer ring, it is possible to reliably prevent the collapse of the ground even when excavating a large diameter tunnel with deep earth cover and high earth pressure and water pressure.

EXAMPLE An example of the present invention will be described below with reference to FIGS. 1 to 4.

As shown in FIGS. 1 and 2, a cutter head 2 is supported at the front of the shield body 1 so as to be rotatable about an axis A, and a rotation drive device (see FIG. (not shown) and the ground is excavated. The cutter head 2 has a plurality of frames 3 arranged in a radial direction centered on the axis A, and these frames 3 have slits 4 for taking in soil formed on both sides of the frame 3, as shown in FIG. A large number of cutter bits 5 facing the front are attached. Also,
A cutter face plate 6 is disposed between these slits 4, and an outer ring 7 is attached to the outer periphery of the cutter head 2.

This outer circumferential ring 7 is formed with a storage groove 9 that opens along the front outer periphery and stores a plurality of joint plates 8 so as to be able to protrude from each other. 119 is divided into four parts by connecting the outer ring 7 and the frame 3 of every 90@ with the outer end bit 5a. Each joint plate 8 is
For example, five arcuate thin steel plates 3a and 3b are stacked and connected at their ends parallel to the axis A, and are long and strong in the circumferential direction, and the storage groove 9 is formed as shown in FIG. A stepped portion 9a is formed at a location where the connecting portion of the thin steel plates 8a and 8b is accommodated. This outer ring 7 also has a storage groove 9.
Two circumferentially long pushing holes 10 penetrating from the bottom to the rear surface of the outer ring 7 are formed in each of the thin steel plates 9a and 9b.

As shown in FIG. 4, the inner front part of the shield main body 1 has a long hole 1 at a position opposite to the long hole 10 for pushing in the outer ring 7.
Storage via 1? A plurality of push jack devices 12 are installed which have push rods 11 that can project the joining plate 8 in #I8 to the front surface of the face. Each push jack device 1
2, the jack main body 12a is installed inside the shield main body 1 behind the pressure bulkhead 13 via the bin 12b and the bracket 12c, and the push rod 11 penetrates the pressure bulkhead 13 and is guided by the guide body 14 so that it can move in and out. Each push-in rod 11 is covered with a cover 15 to be shielded from earth and sand.

Next, the function of this shield excavator in the underground docking method will be explained.

When the shield tunneling machine is launched from the shafts on both sides and docked on the same axis A in the middle part, the cutter head 2 is moved so that the long hole 10 for pushing in the outer ring 7 faces the pushing jack device 12 in the shield body 1. Next, each push jack device 12 is operated to stop the push rod 1.
1, and the joint plates 8 in the housing grooves 9 are respectively projected toward the front surface of the face through the long holes 10 for pushing, and the outer circumferential ring 7' of the cutter head 2' in the other shield tunneling machine is extended.
If a problem occurs with the joint plate 8 of one shield tunneling machine, which is brought into contact with (metal touch), the joint plate of the other shield tunneling machine may be pushed into the front face of the face.Furthermore,
In parallel with the freezing work, the rear equipment in the shield body 1 supplies freezing liquid from a freezing pipe (not shown) installed in the cutter head 2 to freeze the earth and sand around the inside and outside of the protruding joint plate 8. After dismantling the frozen earth and sand, the outer circumferential ring 7 and the protruding joint plate 8 are welded from inside the chamber, and the outer circumferential ring of the other shield excavator with which the joint plate 8 comes into contact is welded. are joined by welding. Further, after dismantling the cutter heads 2, 2' except for the outer ring 7 and the joint plate 8, the outer ring 7 and the joint plate 8 are buried and a secondary lining is performed to complete the tunnel docking work.

Effects of the Invention As described above, according to the present invention, in the underground docking method, the joint plate is protruded from the outer ring of the cutter head of one docked shield tunneling machine toward the front face of the face, and the tip of the joint plate is connected to the other side. The outer ring of the cutter head of the shield tunneling machine is brought into contact with the outer ring of the cutter head to freeze or improve the ground, and after dismantling the rear equipment, the outer ring and the joint plate protruding from this outer ring are welded together, and this joint plate and the outer circumferential ring of the other shield excavator that was in contact with each other are welded and fixed. Therefore, even the ground of a large-diameter tunnel with deep earth cover and high earth pressure and water pressure can be reliably supported by the joint plate and the outer ring, and the safety of workers can be ensured.

[Brief explanation of drawings]

Figures 1 to 4 show one embodiment of the present invention, Figure 1 is a partially cutaway side view of a shield tunneling machine, Figure 2 is a front view of the shield machine, and Figure 3 is shown in Figure 2. A partially enlarged view, FIG. 4 is a side view showing the push jacking device, and FIG. 5 is an explanatory diagram of the underground docking method. 1... Shield body, 2... Cutter head, 7...
・Outer ring, 8... Joint plate, 8a, 8b... Thin steel plate, 9... Storage groove, 10... Elongated hole for pushing, 11.
... Push-in rod, 12... Push-in jack device. Agent Yoshi Morimoto Buddhist painting 1st figure 3rd figure! 7-・Outside) Tsubasa 2゜

Claims (1)

[Claims] 1. A cutter head rotatably supported at the front of the shield body is provided with an outer ring having a plurality of joint plates in the circumferential direction that can move in and out toward the front face of the face, and the joint plates are attached to the shield body so that the joint plates are attached to the front face of the face. A shield excavator characterized by being provided with a push-in jack device that protrudes into the shield.