JPH04140394A - Shield excavator for underground docking - Google Patents

Abstract

PURPOSE:To make it possible to carry out a docking method surely and safely with simple construction by shifting housing positions of matching plates provided on the peripheral surfaces of cutter heads to oppose shield excavators to each other, and projecting the matching plates to interlock them with each other. CONSTITUTION:A plurality of matching plates 9... capable of projecting to the front of a facing are provided on the peripheral surfaces of cutter heads 2 and 2 borne on the front of a shield body 1 so that they are capable of rotating at certain intervals in the circumferential direction. After that, forced jacks 11 and 11 projecting the matching plates to the front of the facing are provided on the cutter heads 2. Then, two opposed shield excavators are stopped by shifting phases of housing positions of the matching plates 9, and both matching plates 9 are projected to interlock. Opposed cutter heads 2 are brought into contact with each other under that condition, and two shield excavators are made to dock. According to the constitution, specification of both shield excavators can be made same.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Use The present invention relates to a method of docking two shield tunneling machines underground that face each other, and particularly relates to a shield tunneling machine used for excavating large-diameter tunnels.

2. Description of the Related Art Generally, when a tunnel is excavated by a shield excavator, the shield excavator is generally started from one starting shaft and finishes excavating the tunnel at the other arrival shaft. However, if it is not possible to secure a site for a shaft in the middle of the tunnel, such as at great depths on the ocean floor or on land, excavation is started using shield excavators from the shafts at both ends, and both shield excavators are docked underground to connect the tunnels. construction method is adopted.

In this type of underground dotting method, the ground at the dotting location is frozen or the ground is improved by injecting chemicals to prevent groundwater from penetrating and the ground from collapsing to increase the compressive strength of the ground, and then shield excavation is carried out. We are carrying out connection work such as dismantling the machine and lining it. However, it is difficult to reliably improve the ground by simply freezing or injecting chemical fluids when excavating large-diameter tunnels with deep earth cover and high soil pressure and water pressure. There was a problem that workers were exposed to danger.

Therefore, shield tunneling machines shown in FIGS. 8 to 10 have been proposed. That is, this means that each shield body 21.
22 has a cutter 23a that is extendable and retractable in the cross-sectional direction of the shield main body 21 and 22, and a cutter 23 that is slidable in the front and rear directions is rotatably supported. A cylindrical penetration ring 24 that can protrude toward the front surface of the face is attached to the front end of one shield body 21.
Further, a penetration chamber 26 is formed at the front end of the other shield main body 22 and encloses the pressure-receiving rubber ring 25 over its entire circumference. When docking, as shown in Figure 10,
After retracting the cutter 23a, the force/yield head 23 is slid into the shield body 21, 22, and the penetration ring 24 is extended and inserted into the penetration chamber 26.

Problems that the invention aims to solve However, the above conventional example has the following problems.

(1) Since the structure of the docking portion of both shield tunneling machines is complicated, there is a possibility that errors may occur during manufacturing, and the cost also tends to be high.

(2) An extremely large penetration (driving) force is required to penetrate the penetration ring 24 into the front surface of the face, and the penetration ring 24 itself requires a material with high mechanical strength. Difficult to accommodate front tilt.

(3) In order to provide a specially expandable cutter 23a, the shape of the cutter head 23 must be changed, resulting in a complicated structure. Legacy costs will also increase. And cutter 23a
It is an object of the present invention to provide a shield excavator for underground docking aimed at solving the above-mentioned problems. It is in.

Means for Solving the Problems In order to solve the above-mentioned problems, the underground docking shield excavator of the present invention has a cutter head rotatably supported at the front of the shield body, which protrudes toward the front surface of the face. A plurality of flexible bonding plates are provided at regular intervals in the circumferential direction, and the cutter head is provided with a pushing jack device that causes the bonding plates to protrude to the front surface of the face.

Effect According to the above configuration, when docking two opposing shield tunneling machines, the phase of the storage position of the joint plates is shifted and stopped, and the pushing jack is extended to project each joint plate toward the front face of the face. , the inner joining plates are brought into contact with the opposing cutter heads in a state of engagement. Then, the ground at the docking area is frozen to improve the ground, the rear equipment of the shield tunneling machine is dismantled, and the joining plates and the outer circumferential member of the cutter head in contact with the joining plates are welded together, and the ground at the docking area is welded together. The mountain is supported by these members. This makes it possible to reliably prevent rock collapse even when excavating a large-diameter tunnel with deep earth cover and high earth pressure and water pressure. Moreover,
Both shield tunneling machines can have the same structure, and since the joint plate can be made small, the penetration driving force can be reduced, and the inclination of the cutter head can be easily accommodated by the amount of protrusion of the joint plate.

EXAMPLE An example of the present invention will be described below with reference to FIGS. 1 to 7.

In this shield tunneling machine, a plurality of conventional joint plates are arranged at regular intervals, and the joint plates protrude from the double-force vine head in an interlocking state in a docked state.

That is, 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 the axis 0°0'. The ground is excavated by rotation by a rotary drive device (not shown). The cutter head 2 has a plurality of spokes 3 arranged in a radial direction centered on the axes o and o', and these spokes 3 have a cutter bit 5 that faces the dirt intake slits 4 formed on both sides of the spokes 3. are installed in large numbers.

Further, a fan-shaped cutter face plate 6 is disposed between these slits 4, and the spokes 3 and the outer ends of the cutter face plate 6 are connected by an outer peripheral plate 7. Inside the outer peripheral plate 7 of each cutter face plate 6, there are a plurality of circular arc-shaped insertion holes 8 along the circumferential direction at regular intervals in the circumferential direction (every 30 degrees around the axis O).
At the rear of the insertion hole 8, a storage box 10 for a joint plate 9 that can freely protrude to the front side of the face through the insertion hole 8 is disposed.

As shown in FIGS. 3 to 5, this joint plate 9 includes a main body 9a having an arcuate cross section with a pointed outer end, and a main body 9a fixed to the inner circumferential side of the distal end of the main body 9a, with the distal end slanting toward the outer circumferential side. Front plate 9b
and both side plates 9c fixed to the inner peripheral side of both side ends of the main body 9a.
It consists of Inside the joint plate 9, piston rods 11a that can move backward and forward are arranged at regular intervals in the storage box 1.
0's rear plate 1 (multiple pieces (three in the drawing) fixed to la)
A push-in jack 11 is fixed in the front-rear direction, and pressure oil is supplied into its working chamber 11b from a hydraulic pipe 12 through an oil supply hole 11d formed in a piston 11c and a piston rod 11a. Further, a freezing pipe 13 is disposed in a roundabout manner in a portion of the joining plate 9 that protrudes from the cutter head 2, and is connected to the freezing pipe 13 via a flexible hose (not shown) or the like so that freezing liquid can be supplied thereto. Reference numeral 14 denotes a guide shoe for the joint plate 9 disposed inside the storage box. The interval Ω between these joint plates 9 is set to be slightly larger than the width W of the joint plates 9, and cutter bits 5 are attached to the spokes 3 between the joint plates 9. Although not shown, the hydraulic pipe 12 and the freezing liquid supply/discharge pipe are connected to the shield body 1 side via the support legs of the cutter head 2 and the like.

Next, the underground docking method using this shield tunneling machine will be explained with reference to FIGS. 6(a) to (h). In addition, the shield excavation I used for this tunnel excavation! lA.

B has the same structure.

1. [Fig. 6(a)] The preceding shield excavator A is brought to the joining point, and the ground is improved around the outer circumference of the cutter head 2 depending on the condition of the ground.

2. [Figure 6(b)] Check polling is performed at the point where the trailing shield tunneling machine B approaches a predetermined distance.

3. [Fig. 6 (C)] Check the posture of the leading shield excavator A and the trailing shield excavator B by check polling, and check the difference in the deviation and inclination of the center line (axis center) of both. Trailing shield excavation II to be within the predetermined error
Bring B closer.

4. [Fig. 6(d)] The cutter head 1 of the trailing shield excavator 1 mB is stopped so that the phase is shifted by 15 degrees from the cutter head 2 of the leading shield excavator WAA, and both shield excavators A and B are joined. The plate 9 is made to protrude in an interlocking manner as shown in FIG. 7 by extending the push-in jack 11. At this time, even if there is a deviation between the shield axes o and o', for example as shown in FIG. can be easily accommodated.

5. [FIG. 6(e)] The movable freezing tube 15 disposed in the shield book #, 1 is made to protrude outward from the front through the poling hole to freeze the outer periphery of the ground.

Also, the soil taken in inside the pressure chamber 16 is solidified.

6. [FIG. 6 (D)] The joint portion is frozen using the freezing tube 17 provided in the hood of the shield body 1 and the freezing tube 13 inside the joining plate 9.

7. [Figure 6 (g)] In parallel with the freezing work, dismantle the shield excavator, and connect the joint plate 9 and the outer periphery of the cutter head 2 directly or with reinforcing material as necessary. or by welding through a water-stopping member.

8. [Fig. 6 (h)] The joint plate 9, the outer circumferential plate 7 of the cutter head 2, the skin plate of the shield body 1, etc. are left as structures, and concrete 18 is attached to their inner circumferences to form a secondary covering. carry out construction.

Effects of the Invention As stated above, according to the present invention, ■ Since the specifications of both shield excavators for docking can be made the same, it is possible to prevent troubles during manufacturing, and the cost is low. Since the joining plates are made to protrude from the machine in an interlocking manner, the joining plates can be made small and their penetration force is small, and the strength of the joining plates themselves can be increased.Furthermore, by adjusting the amount of protrusion of each joining plate,
Easily accommodates tilting of the front surface of the cutter head.

■Since the cutter head can be made into almost the same structure as the conventional one, the technology cultivated in the past can be applied without reducing the digging force and soil uptake force during normal excavation.

Moreover, the structure is extremely simple, with no need for a telescopic cutter, and there are no problems with wear or durability.

[Brief explanation of drawings]

1 to 7 show an embodiment of the present invention, in which FIG. 1 is a half-plane view of the cutter head, FIG. 2 is a partially cutaway side view of the cutter head, and FIG.
Figures 3 to 5 are front views, side sectional views, and plan views showing the joining plate, Figures 6 (a) to (h) are explanatory diagrams of the docking method, and Figure 7 is a partial perspective view showing the docking state. Figure, 8th
Figures 1 to 10 show a conventional underground docking shield excavator, with Figure 8 being a 111 sectional view, Figure 9 being a front view, and Figure 9 being a front view.
Figure 0 is a longitudinal sectional view showing the docking state. 1... Shield body, 2... Cutter head, 3...
・Spoke, 6... Cutter face plate, 7... Outer plate, 8
...Insertion hole, 9...Joining plate, 10...Storage box, 1
1... Push jack, 13... Freezing tube. Agent Yoshihiro MorimotoFigure 5Figure 1Figure 2

Claims (1)

[Claims] 1. A plurality of joint plates that can protrude toward the front face of the face are provided at regular intervals in the circumferential direction on the outer periphery of the cutter head rotatably supported on the front part of the shield body, and the joint plates are attached to the cutter head so that the joint plates are attached to the front face of the face. A shield excavator for underground docking, characterized in that it is equipped with a push jack device that protrudes from the ground.