JPH04174190A - Shield excavator for underground docking - Google Patents

Abstract

PURPOSE:To raise the efficiency of docking operation by a method in which a small-diameter docking seal cylinder with an excavating cutter is attached to the front half side of a seal cylinder in such a way as to enable it to rotatably come in or out to the axial and radial directions. CONSTITUTION:A docking seal cylinder 21 is rotatably attached to the small- diameter front half side 20 of the seal cylinder 1 of an excavator through a bearing metal 25. An excavating cutter 4 is provided to the front side of the cylinder 21, and coupling projections 24 are formed on the back of the cutter 4 to permit them to fit into recessions formed on the inner surface of the cylinder 21. An oil-pressure jack 25 for operating the projections and a guide rail 26 are provided to the cutter 4 to enable the projections 24 to rotatably come in or out to the axial and radial directions. The efficiency and safety of docking operation between shield tunnel can thus be raised.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a shield tunneling machine for underground docking used when docking shield tunnels in a mutually intersecting arrangement or abutting arrangement.

(Prior Art) Conventionally, as a shield excavator using muddy water, there is a structure shown in FIGS. 7 and 8. This shield excavator has a partition wall 2 inside the tip of a cylindrical shield ffJ1, and the front side of the partition wall 2 is used as a mud room 3, and an excavation cutter 4 (also known as a cutter disc) supported by the partition wall 2 can be freely rotated around a shaft 5. We are preparing for

The excavation cutter 4 has a plurality of slits 6 which are opened in the front and back in a radial arrangement, and a cutter bit 7, 7, old, etc. is made to protrude forward from the edge of each slit 6.

Furthermore, the bulkhead 2 is penetrated by a mud feeding pipe 8 and a mud draining pipe 9, which feed muddy water into the muddy water chamber 3 and pressurize it to prevent the face from collapsing and to discharge the excavated soil along with the muddy water. . In the figure, 10 is an agitator for stirring the excavated soil and muddy water, 11 is an excavation jack, and 12 is a lining wall assembled by segments.

When excavating a tunnel, the excavation cutter 4 is rotated while sending and discharging mud water into the mud chamber 3 and through the mud drainage pipe 8.9, and the shield eJ1 is pushed out by the jack 11 to tunnel, and the tunnel is excavated for a certain length. Thereafter, the segments are assembled into a cylindrical shape within the rear end of the shield sill 1 to extend the lining wall 12, and then the process of further digging is repeated.

When docking a tunnel in a direction that intersects with an existing tunnel using this conventional device, the excavation is stopped before it comes into contact with the existing tunnel 13, as shown in FIG. The bulkhead 2 and excavation cutter 4 are removed, and the unexcavated portion a between both tunnels 13 and 14 is excavated by hand, and the existing tunnel 13 and the new tunnel 14 are connected as shown in Figure 9 (b). was. In addition, in order to prevent the ground from collapsing and flooding in the hand-dug portion, a ground hardening agent such as cement milk was injected in advance around the unexcavated portion a.

In addition, when tunnels excavated in opposite directions are docked underground in the butt direction, the ground around the docking part may freeze, especially in the ground where the ground is unstable due to high water pressure such as undersea tunnels. There is also a method to stop water and prevent the collapse of the ground by injecting a chemical solution into the ground and solidifying it. A method of passing between tunnels has been developed.

(Problems to be Solved by the Invention) With the conventional shield tunneling machine described above, when docking a tunnel underground, it is necessary to inject a large amount of chemical solution and freeze the ground, which takes a long time, resulting in a large amount of cost and time. However, if there is a flow of groundwater, sufficient consolidation cannot be expected. In addition, the hardened ground must be excavated, and the excavation is done by hand, which is difficult to work with and is often dangerous.

In view of the above-mentioned conventional problems, the present invention aims to provide a shield excavator for underground docking which can shorten the excavation time when docking a tunnel underground and improve work efficiency. It is.

(Means for Achieving the Object) A feature of the present invention for achieving the above-mentioned object is a shield excavator which is provided with an excavation cutter rotatably provided on the front side of a partition wall provided at the front end of a shield tube. , a docking seal cylinder is provided on the outer periphery of the front end of the shield cylinder, the tip of which can protrude to the front of the excavation cutter, is rotatably supported with respect to the shield cylinder, and has a cutting bit protruding from the tip; An engagement protrusion that engages with the inner surface between the docking seals is supported on the back surface of the excavation cutter so as to be movable in and out of the rotation radius of the excavation cutter and reciprocated in the axial direction. The present invention is provided with a driving means for moving the protrusion in the radial direction and the axial direction.

(Function) In the underground docking shield excavator of the present invention,
With the docking seal tube retracted, it excavates in the same way as a conventional shield excavator, and the lining wall made of segments is sequentially extended to the rear. When docking a tunnel underground, the advancement of the shield tube is stopped, and the engagement protrusion supported by the excavation cutter is moved to the retreating side and protrudes in the radial direction to engage between the docking seals. In this state, the engaging protrusion is moved in the forward direction while rotating the excavating cutter. As a result, the docking seal cylinder advances while cutting other ridges into a cylindrical shape using the cutting bit at the front end. Then, after advancing the engaging protrusion by one stroke in the front-rear direction, the engaging protrusion is retracted and re-engaged with the rear side of the docking seal cylinder. Advance to a predetermined length position.

When docking on the side of an existing tunnel in this way, the lining wall of the existing tunnel is cut into a cylindrical shape between the above-mentioned docking seals, and the seal tube is hung between the existing tunnel and the shield tube. When docking in opposite directions, the docking seal tube is advanced to the outer periphery of the tip of the shield tube of the opposing shield tunneling machine, and the hook is passed between the two opposing shield tubes. The unexcavated portion of the tunnel will be excavated and the tunnels will be dotted.

(Example) Next, an example of the present invention will be described with reference to FIGS. 1 to 6. Note that the same parts as those in the prior art described above are given the same reference numerals, and the explanation thereof will be omitted.

This shield tunneling machine has a small-diameter portion 20 approximately in the front half of a shield tube 1, and a cylindrical docking seal tube 21 is rotatably fitted to the outer periphery of the small-diameter portion 20 via a bearing metal 22. ing. This seal cylinder 21 has a length such that its tip is located at the rear edge of the excavation cutter 4 in the most retracted state, and a number of cutting bits 21a are protruded from the tip edge.

On the inner peripheral surface of the seal cylinder 21, a recess 23 (shown in FIG. 3) into which an engaging protrusion described later is fitted is located at a predetermined angular position in the circumferential direction and is parallel to the axial direction of the seal cylinder 21. A plurality of them are arranged side by side.

On the other hand, on the back surface of the excavation cutter (cutter disk) 4, a plurality of engagement protrusions 24 are supported outward in the rotational radial direction of the excavation cutter 4.

The engaging protrusion 24 is moved in and out in the radial direction by a hydraulic jack 25 for moving the protrusion in and out.

Further, the hydraulic jack 25 is movably supported by a guide rail 26, and this guide rail 26 is fixed to a bracket 27 protruding from the back of the excavation cutter 4.
It is oriented parallel to the direction of the rotational axis of the cutter 4.

A hydraulic jack 28 for sliding the protrusion is interposed between the hydraulic shirt 825 and the excavation cutter 4, and by sliding the hydraulic jack 25 along the kite rail 26 with this hydraulic jack 28, the engagement protrusion is removed. 24 is adapted to be moved in the axial direction of the excavation cutter.

Next, underground docking of a tunnel by the above-mentioned shield excavation 11A will be explained.

First, when intersecting and docking the existing tunnel 13, as shown in FIG.
The excavation is stopped at a position approaching , the hydraulic jack 28 is extended and the engagement projection 24 is retreated, and the
The retaining protrusion 24 is made to protrude, and its tip is sealed fi.
21 into the concave portion 23 on the inner surface thereof.

In this state, the hydraulic jack 28 is retracted while rotating the excavation cutter 4. As a result, the seal gap 21 moves forward while excavating the ground in a cylindrical shape with the excavation bit 21a. Then, after advancing the hydraulic jack 28 by one stroke, it is stopped, the engaging protrusion 24 is retracted, and the engaging protrusion 24 is retreated again to engage the rear concave portion 23 again. Move forward while rotating. In this way, the seal fi21 is advanced and the lining wall 1 of the existing tunnel 13 is
3a is excavated into a cylindrical shape, and the seal tube 21 is passed between the lining wall 13a and the shield tube 1. After that, the partition wall 2 and the excavation cutter 4 are removed and the earth and sand in the seal tube 21 is discharged. Both tunnels are dotted.

In addition, when docking between newly constructed tunnels excavated in opposite directions, the shield excavator A according to the present invention is used on one side of the opposing shield excavators, and as shown in FIG. 111A and 111B, and in the same way as above, move between the seals 21 of shield tunneling machine A.
The shield cylinder 1 of the other shield tunnel machine B is advanced to the outer periphery of the tip of the shield cylinder 1, and the seal cylinder 21 is passed between the two shield cylinders 1°1 as shown in Fig. 6 (b). The partition wall 2 and excavation cutter 4 are removed and the earth and sand in the seal cylinder 21 are removed, thereby docking both tunnels.

(Effects of the Invention) As described above, the underground docking shield excavator of the present invention has a docking seal tube with a drilling bit protruding from the tip on the outer periphery of the tip of the shield tube, which is rotatable, By attaching it in a slidable manner and allowing it to move forward by engaging with the engagement protrusion provided on the back of the excavation cutter, when docking between shield tunnels underground, it is possible to This docking seal tube can be hung between the shield tube of the shield tunneling machine, and the docking work efficiency is significantly improved, allowing the work to be completed safely and in a short time. This is what became.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing the schematic structure of an embodiment of the underground docking shield tunneling machine according to the present invention, and FIG. 2 is a front view of the same.
Figure 3 is an enlarged sectional view of the same part, Figure 4 is A-A in Figure 3.
Line cross-sectional views, Figures 5 (a) and (b), and Figures 6 (a) and (b) are cross-sectional views showing different underground docking states, and Figure 7 is a cross-sectional view showing a conventional example of a shield tunneling machine. Figure 8 is a front view of the same;
FIGS. 9(a) and 9(b) are cross-sectional views showing the conventional docking method. a... Unexcavated part, 1... Shield cylinder, 2... Bulkhead, 3... Mud water chamber, 4...
...Drilling cutter, 5...Axis, 6...
...Slit, 7...Cutter bit, 8...
...Sludge feeding pipe, 9...Sludge removal pipe, 10...
... Agitator, 11 ... Excavation jack, 1
2...Lining wall, 13...Existing tunnel, 14...New tunnel, 20...Small diameter section, 21...For docking Seal tube, 21a
・・・・・・Cutting bit, 23 ・・・Recessed part, 2
4... Engaging protrusion, 25.28... Hydraulic jack, 26... Guide rail, 27...
bracket.

Claims (1)

[Claims] In a shield excavator which is rotatably provided with an excavation cutter on the front side of a partition wall provided at the front end of a shield tube, the shield includes a shield on the outer periphery of the front end of the shield tube, the tip of which can protrude to the front of the excavation cutter; The excavation cutter is equipped with a docking seal cylinder that is rotatably supported relative to the cylinder and has a cutting bit protruding from its tip, and an engagement protrusion that engages with the inner surface of the docking seal cylinder on the back surface of the excavation cutter. What is claimed is: 1. A shield excavator, which is supported so as to be movable in and out in the rotational radial direction and reciprocally movable in the axial direction, and includes a driving means for operating the engaging protrusion in the radial direction and the axial direction.