JPH04360987A - Method of joining shield machine underground joining shield machine therefor - Google Patents

Abstract

PURPOSE:To enable and ensure the joining of both shield machines when a tunnel is excavated from opposite directions by two shield machines to pass through the tunnel. CONSTITUTION:Rotary excavation cutters of both shield machines 1 and 2 are constituted of disk-like circular cutters 5 and 6 and the peripheral ring cutters 7 and 8 arranged to the peripheral surfaces of the circular cutters 5 and 6 so that they are capable of rotating together as a unit and are capable of sliding front and rear. The circular cutter 6 of one shield machine has a smaller diameter than that of the circular cutter 5 of the other shield machine, the peripheral ring cutter 8 of the circular cutter 5 is advanced, so that it is covered on the circular cutter 6 in a move-back trace of the peripheral ring cutter 8 of one shield machine. In addition, an air tube provided to the peripheral surface of the circular cutter 6 is expanded, and pressure welding of the air tube to the circumferential surface of the peripheral ring cutter 8 is made.

Description

[Detailed description of the invention]

0001

[Industrial Field of Application] The present invention relates to a method for joining both shield machines to each other at the time of excavating and penetrating a tunnel by making two shield machines excavate in a direction approaching each other, and the implementation of this method. This relates to a shield machine used for.

0002

[Prior Art] Conventionally, when a tunnel is excavated from opposite directions using two shield machines and the tunnel excavated by these shield machines is penetrated at the middle part of the tunnel, the tips of both shield machines are brought close together. A method has been adopted in which the outer ground between the tips is frozen to prevent underground water leakage, and then the shield machine is dismantled and the unexcavated area is excavated. However, there are problems in that not only does the construction period become longer, but the construction cost is also higher.

For this reason, while the circular cutter of one shielding machine is moved backward, the circular cutter of the other shielding machine is advanced and inserted into the skin plate of one shielding machine, and as it moves forward, the rotation of the circular cutter causes A shield machine joining method has been developed that excavates the unexcavated ground and penetrates the tunnel.

0004

[Problems to be Solved by the Invention] However, the skin plate and circular cutter of both shield machines are formed to have the same diameter for excavating a tunnel of a constant diameter, and therefore, the skin plate of one shield machine has the same diameter as that of the other shield machine. At present, it is difficult to employ this method because high precision is required to smoothly insert the circular cutter of the shield machine, and there are cases where it is difficult to join reliably. It is an object of the present invention to solve these problems and to provide a method for underground joining of a shield machine and a shield machine for the joining, which can easily and reliably join both shields.

[0005]

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a circular cutter having a diameter smaller than that of the skin plate, and an outer periphery of the tip of the circular cutter protruding from the skin plate, which rotates integrally with the circular cutter. a first shielding machine having a circular cutter having a smaller diameter than the circular cutter of the first shielding machine; and a circular cutter having a smaller diameter than the circular cutter of the first shielding machine, and a circular cutter having a circular cutter having a diameter smaller than that of the first shielding machine; A welding shield machine is used, which has a small-diameter circular cutter, a retractable outer circumferential ring cutter that rotates integrally with the cutter, and a second shield machine in which an air tube is disposed on the outer circumferential surface of the circular cutter.

[0006]Then, both shield machines excavate tunnels in a direction approaching each other, and when these shield machines are joined, the circular cutters of both shield machines are stopped in contact with or close to each other, and then the first shield machine The outer ring cutter of the second shield machine is moved forward and the outer ring cutter of the second shield machine is moved backward to cover the outer ring cutter of the first shield machine over the circular cutter of the second shield machine, and then the air tube is expanded to It is characterized by being brought into pressure contact with the inner circumferential surface of the outer ring cutter of the 1-shield machine.

[0007]

[Operation] Since the circular cutter of the second shield machine is formed to have a smaller diameter than the circular cutter of the first shield machine, when the outer ring cutter of the circular cutter of the first shield machine is advanced, the outer ring cutter of the second shield machine is moved forward. It will easily fit over the circular cutter of the shield machine. Next, when the air tube disposed on the outer peripheral surface of the circular cutter of the second shield machine is inflated, the air tube comes into pressure contact with the inner peripheral surface of the outer ring cutter of the first shield machine, preventing the infiltration of earth and sand and groundwater. to ensure prevention.

[0008]

[Embodiment] Next, an embodiment of the present invention will be described with reference to the drawings. 1 is a first shield machine, 2 is a second shield machine, and the skin plates 3 of these shield machines 1 and 2 are
, 4 are formed to have the same diameter, and the rotary cutters arranged at the open ends of the skin plates 3 and 4 are divided into circular cutters 5 and 6 in the center and outer ring cutters 7 and 8, respectively. It is formed. The circular cutter 6 of the second shielding machine 2 is formed to have a smaller diameter than the circular cutter 5 of the first shielding machine 1.

As shown in FIG. 2, the circular cutters 5 and 6 have closed cutter plates 5a and 6a, each having a large number of excavation bits 10 protruding from the front surface and an earth and sand intake slit (not shown). and cylindrical wall portions 5b, 6b integrally provided on the outer peripheral edges of the closed cutter plates 5a, 6a toward the inside of the machine.
and these circular cutters 5 and 6.
is formed to have a smaller diameter than the skin plates 3 and 4, and its tip portion protrudes from the skin plates 3 and 4.

The outer circumferential ring cutters 7, 8 are fitted onto the outer peripheries of the tips of the circular cutters 5, 6 protruding from the skin plates 4, 5, and have a large number of drilling bits 11 protruding from their front end faces. Cutting parts 7a, 8a with hollow rectangular cross section
and cylindrical parts 7b and 8b extending inward from the inner peripheral walls of the cutter rings 7a and 8a, respectively, and the outer diameters of the cutter rings 7a and 8a are made equal to the outer diameters of the skin plates 3 and 4. The inner diameter of the cylindrical portion 7b is
, 8b are formed to have diameters that make sliding contact with the outer peripheral surfaces of the circular cutters 5 and 6, respectively.

[0011] Therefore, the cutting part 8a on the second shielding machine 2 side is thicker than the cutting part 7a on the first shielding machine 1 side by the small diameter of the circular cutter 6. The cylindrical portion 8b extending from the inner periphery of the cutter ring 8a is formed to be thicker than the cylindrical portion 7b of the outer ring cutter 7 on the first shield machine 1 side, so that it is not connected to the skin plates 3 and 4. It is preferable that the gaps between the skin plates 3 and 4 are substantially the same, and sealing members 12 and 13 made of wire brushes are provided on the outer circumferential surfaces of these cylindrical portions 7b and 8b, respectively, and protrude from the inner circumferential surfaces of the skin plates 3 and 4. There is a sliding contact.

Reference numeral 9 denotes an annular air tube provided around the outer circumferential surface of the circular cutter 6 of the second shielding machine 2, and a circumferential groove 1 is formed in the outer circumferential portion of the cylindrical wall portion 6b facing the inner circumferential surface of the cutting portion 8a.
4 is provided and recessed in this circumferential groove 14, and an air hose 15 is connected and communicated with the air tube 9 by passing through a suitable position of the cylindrical wall portion 6b from inside the machine, and is connected to this air hose 15 at a suitable position inside the machine. By pressurizing air from the disposed compressed air supply source 20, the air tube 9 is expanded outward from the outer peripheral surface of the cylindrical wall portion 6b.

Reference numerals 16 and 17 designate a plurality of hydraulic jacks that are mounted at regular intervals in the circumferential direction on the inner peripheral surfaces of the cylindrical walls 5b and 6b of the circular cutters 5 and 6, respectively, and are integrally attached to the rod ends of the hydraulic jacks. The connected bracket bodies 18 and 19 are integrally fixed to the inner surfaces of the end portions of the cylindrical portions 7b and 8b of the outer circumferential ring cutters 7 and 8, respectively, and the operation of these hydraulic jacks 16 and 17 allows the first shield machine 1 to be The outer ring cutter 7 is moved forward, and the outer ring cutter 8 of the second shield machine 2 is moved backward. In addition, the hydraulic jack 1 on the first shield machine side
A slit for guiding the bracket body 18 is provided in the cylindrical wall portion 5b of the circular cutter 5 so as not to interfere with the advancement of the bracket body 18 when the bracket body 6 is operated.

Furthermore, in order for the circular cutters 5 and 6 and the outer ring cutters 7 and 8 to rotate together during excavation, uneven grooves that engage with each other are provided in the longitudinal direction on the opposing circumferential surfaces of the cutters 5 and 6 to form a spline-fitting state. Or use circular cutters 5 and 6.
A plurality of pin or bolt insertion holes (not shown) are formed through the inner surfaces of the cylindrical wall portions 5b and 6b, and these pins or bolts are provided on the inner circumferential surfaces of the outer ring cutters 7 and 8. A means is provided for locking and screwing the pin or bolt into the hole and removing the pin or bolt after excavation.

Reference numerals 21 and 22 are passages for injecting water-stopping material provided in the skin plates 3 and 4 of both shield machines 1 and 2, and the opening ends thereof are connected to the cutting portions 7a of the outer ring cutters 7 and 8.
It is facing the back side of 8a. and these passages 21
, 22 are connected and communicated with injection devices 23 and 24 installed at appropriate locations in the first and second shield machines 1 and 2, respectively, through appropriate piping 25 and 26, as shown in FIG.

A water stop material injection hole 27 is also formed in the tip of the cylindrical wall portion 6b of the circular cutter 6 of the second shielding machine 2, and a supply pipe 28 is connected to and communicated with this injection hole 27. ing. This supply pipe 28 and the air hose 15 are connected to the circular cutter 6
The hydraulic jacks 16 and 17 are connected and communicated with the compressed air supply source 20 and an injection device 31 disposed at an appropriate position inside the machine through the central rotating shaft 30 of the machine. From sources 32, 33 to rotating shafts 29, 30
The inside is communicated via pipes 34 and 35.

The rotary shafts 29 and 30 of the circular cutters 5 and 6 of the first and second shield machines 1 and 2 are rotated and moved back and forth by partition walls 36 and 37 that are integrally fixed within the front ends of the skin plates 3 and 4, respectively. It is freely penetrated and supported, and the partition walls 36, 3
The rotary drive motors 38 and 39 installed on the back side of the 7 rotate through an appropriate transmission mechanism such as a meshing gear train, and the longitudinal drive motors are connected between these rotating shafts 29 and 30 and the partition walls 36 and 37, respectively. It is configured to be moved back and forth in the axial direction by jacks 41 and 42. 43,
Reference numeral 44 denotes propulsion jacks attached to multiple locations on the inner peripheral surfaces of the skin plates 3 and 4.

Further, the spaces between the opposing surfaces of the circular cutters 5 and 6 and the partition walls 36 and 37 are formed into earth and sand intake chambers 45 and 46, respectively, and a feeding and mud removal pipe 47 that communicates with the earth and sand intake chambers 45 and 46 is formed.
, 48; 49, and 50 are constructed so that the excavated earth and sand brought into the room by the muddy water flowing back is discharged to the outside of the tunnel.

The first shield machine and the second shield machine constructed in this way
The joining shield machine consists of a shield machine and a first shield machine 1 and a second shield machine 2. The first shield machine 1 and the second shield machine 2 are propelled toward each other from starting pits with an appropriate length interval, and while excavating a tunnel, approach each other. let The ground is circular cutter 5
, 6 and the outer ring cutters 7, 8 are rotated together, and the excavated soil is taken into the earth and sand intake chambers 45, 46 and discharged through the mud water pipes 47-50.

Further, as the tunnel is excavated, its wall surface is covered with a segment lining 51, and the shield machines 1 and 2 are equipped with propulsion jacks 43 and 44 on the end faces of the segment lining 51.
It is propelled by extending the jacks 43 and 44.

In this way, the first and second shield machines 1 and 2
While excavating and constructing the tunnel 52, both shield machines 1 and 2 approach each other, and when they have excavated sufficiently close to each other as shown in FIG. 2, they are stopped in that state. Next, by operating the jack 42 while rotating the circular cutter 6 of the second shield machine 2 together with the outer ring cutter 8 and moving it forward toward the first shield machine 1, both shield machines are cut as shown in FIG. The unexcavated ground 53 between 1 and 2 is excavated.

The circular cutter 6 and the outer ring cutter on the second shield machine 2 side until the circular cutters 5, 6 and outer ring cutters 7, 8 of the first and second shield machines 1, 2 come into contact with or come close to each other. Unexcavated ground 5 due to the unexcavated advance of 8
3 is excavated, and after stopping in that state, the circular cutters 5 and 6 of both shield machines and the outer ring cutters 7 and 8 are released from the pins, bolts, etc., and the hydraulic jacks 16 and
17 to move the outer circumference ring cutter 8 on the second shield machine 2 side backward, and move the outer circumference ring cutter 7 on the first shield machine 1 side forward, and move the outer circumference ring cutter 7 on the first shield machine 1 side to the second shield machine 1 side. Cover the outer periphery of the circular cutter 6 at the trace of the outer ring cutter 8 that has retreated on the shield machine 2 (Fig. 4
reference).

At this time, since the circular cutter 6 of the second shielding machine 2 is formed to have a smaller diameter than the circular cutter 5 of the first shielding machine 1, the circular cutter 6 and the outer ring cutter on the first shielding machine side are Since a relatively large gap is provided between the shields 1 and 8, the outer ring cutter 7 can be easily fitted onto the circular cutter 6 even if the shield machines 1 and 2 are connected somewhat eccentrically.

Next, the circular cutter 6 is connected to the air hose 15.
Compressed air is supplied to the air tube 9 disposed in the circumferential groove 14 to expand the air tube 9 and bring it into pressure contact with the inner peripheral surface of the fitted outer ring cutter 7. At this time as well, even if the circular cutter 6 and the outer ring cutter 7 are slightly eccentric, the air tube 9 is moved around the entire circumference according to the state.
Press with uniform pressing force.

In this way, the joining of both the shield machines 1 and 2 is completed, but after the completion or while the outer ring cutters 7 and 8 are moving, the water stop material injection passages 21 and 22 and the water stop material injection Filling the excavated gap (junction) between the opposing surfaces of the skin plates 3 and 4 with a water stop material 54 through the hole 27;
Let solidify.

After that, both shield machines 1 and 2 are disassembled, leaving the skin plates 3 and 4 and the outer ring cutters 7 and 8, and the inner peripheral surface of the joint is reinforced by pouring concrete, etc., and both shields are removed. It connects the tunnels excavated by machines 1 and 2.

[0027]

As described above, according to the present invention, the circular cutter of the second shielding machine is formed to have a smaller diameter than the circular cutter of the first shielding machine, and each circular cutter has an outer ring cutter having the same outer diameter. are arranged to be integrally rotatable and slidable back and forth, so that the inner diameter of the outer ring cutter of the first shield machine is larger than the outer diameter of the circular cutter of the second shield machine. By retracting the outer ring cutter on the second shield machine side and advancing the outer ring cutter on the first shield machine side, even if both shield machines are slightly eccentric, the outer ring cutter on the first shield machine side can be moved forward. It can be easily placed over the circular cutter on the two-shield machine side, making it possible to securely join the two-shield machine, and to efficiently perform penetrating work between tunnels excavated by both shield machines.

Furthermore, since an air tube is disposed on the outer circumferential surface of the circular cutter of the second shield machine, air is pressurized into this air tube and expanded.
Even if the fitting state of the outer ring cutter of the shield machine and the circular cutter of the second shield machine is slightly eccentric, the inner circumferential surface of the outer ring cutter can be pressed evenly over the entire circumference, and dirt and groundwater can be prevented. It is possible to achieve a bonded state that reliably prevents the infiltration of

[Brief explanation of drawings]

[Fig. 1] A simplified longitudinal cross-sectional side view of a joining shield machine showing the state of tunnel excavation.

[Fig. 2] Partially enlarged vertical sectional side view before joining,

[Fig. 3] Partially enlarged vertical sectional side view at the time of joining,

FIG. 4 is a partially enlarged vertical cross-sectional side view showing a state in which joining is completed.

[Explanation of symbols]

1 First shield machine 2 Second shield machine 3. Skin plate 4. Skin plate 5 Circular cutter 6 Circular cutter 7. Outer ring cutter 8. Outer ring cutter 9 Air tube

Claims (2)

[Claims] 1. A first shielding machine comprising a circular cutter having a diameter smaller than that of the skin plate, and an outer peripheral ring cutter that rotates integrally with the circular cutter and can move forward on the outer periphery of the tip of the circular cutter that protrudes from the skin plate. , a circular cutter having a smaller diameter than the circular cutter, and an outer ring cutter on the outer periphery of the circular cutter protruding from the skin plate, which rotates integrally with the circular cutter and is retractable; further, an outer peripheral surface of the circular cutter; A tunnel is excavated in a direction approaching each other by a second shield machine having an air tube arranged in the first shield machine, and when joining these first and second shield machines, the circular cutters of both shield machines are brought into contact with or close to each other. Then, the outer ring cutter of the first shield machine is moved forward, and the outer ring cutter of the second shield machine is moved backward, so that the outer ring cutter of the first shield machine covers the circular cutter of the second shield machine. . Then, the air tube is expanded and brought into pressure contact with the inner circumferential surface of the outer ring cutter of the first shield machine. 2. A shielding machine for underground joining consisting of a first shielding machine and a second shielding machine, wherein the first shielding machine rotates integrally with the circular cutter on the outer periphery of the tip of the circular cutter protruding from the skin plate. In addition, the second shield machine is equipped with a peripheral ring cutter that is advanced by a jack, and the second shield machine has a ring cutter with a smaller diameter than the circular cutter of the first shield machine in the front end opening of a skin plate that has the same diameter as the first shield machine. A circular cutter is provided, and an outer ring cutter that rotates integrally with the circular cutter and can be retracted by a jack is provided on the outer periphery of the circular cutter, and an air tube is further provided on the outer peripheral surface of the circular cutter. A bonding shield machine characterized by: