JPS6217075B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for enlarging and excavating the outer periphery of an already excavated normal diameter tunnel, and in particular, a device for enlarging and excavating a tunnel, which is capable of arbitrarily enlarging and excavating by varying or eccentrically enlarging the diameter of the enlarged excavation. It is related to the device.

The shield method is often used as an excellent construction method for tunnel excavation for subway construction and underground cable burying work, but when building subway stations or connecting underground cables, it is often necessary to use the shield method. It becomes necessary to enlarge the section. The applicant previously proposed a new tunnel expansion excavation method in Japanese Patent Application No. 56-153966 (Japanese Unexamined Patent Publication No. 58-98595) as a construction method for carrying out the above-mentioned expansion work. This new construction method involves excavating a normal-diameter tunnel using a primary shield machine, then removing the primary segment at one end of the area scheduled for expansion and performing enlarged excavation to construct a starting base, and then assembling and installing the expanded This is a construction method in which a shield machine is propelled in the axial direction along the outer circumference of a normal diameter tunnel, and the enlarged section is constructed by performing widening work while removing the primary segment and attaching the secondary segment to the enlarged excavated section.

Therefore, this application proposes an enlarged tunnel excavation device suitable for performing enlarged excavation within a relatively short range in the axial direction, such as the starting base, and the gist of the present application is as follows.

A device that sequentially removes the primary segments of an area scheduled for expansion installed in a normal diameter tunnel and excavates the outer periphery to enlarge the area, the guide being installed concentrically over the entire circumference of the primary segments at both ends of the area scheduled for expansion. ring, a rotary mount which is movably engaged along the guide ring at its distal end and is fitted with a fluid cylinder which expands and contracts in the radial direction of the normal diameter tunnel at its proximal end, and a blade opening at its propulsion distal end. This tunnel expansion excavation device is equipped with a circumferential shield machine whose proximal end side is fixed to the rotary mount, which excavates along the circumferential direction around the outer periphery of the normal diameter tunnel using a built-in propulsion jack.

As a result, there is no need to provide a vertical shaft when carrying out enlarged excavation, and enlarged excavation can be carried out efficiently in the area to be enlarged by parallel work with normal diameter tunnel excavation.

In particular, since the circumferential shield machine can be moved forward and backward in the radial direction using the built-in fluid jack, it is possible to perform enlarged excavation of any diameter concentrically with the normal diameter tunnel, as well as eccentric enlarged excavation. This is a new tunnel expansion excavation device that has the following effects.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Below, embodiments of the apparatus of the present invention will be described with reference to drawings together with a construction method.

First, as shown in FIGS. 1 and 2, the lower primary segment 3a of the primary segment 3 in the area to be expanded 2, which is formed on the outer periphery of the normal diameter tunnel 1, is removed, and the primary segment 3a in the area to be expanded is removed. The guide ring pieces 5a and 6a on the lower side of the divisible guide rings 5 and 6 that have been installed in advance between the primary segment 3 and the adjacent primary segment 4 outside the planned expansion area are removed. Then, a steel box 7 with a rectangular cylindrical frame is installed in the position of the removed primary segment 3a, and while adding the necessary length, it is press-fitted into the other mountain below using jacks etc. After digging out the earth and sand, the bottom plate 7a and the reaction force receiver 8 are respectively attached as shown in FIGS. 3 and 4.

The above-mentioned steel box 7 is for earth retention and may be omitted depending on the soil quality of the ground. Next, the guides 9b and 10b of the rotary mounts 9 and 10 are rotatably fitted into the removed guide ring pieces 5a and 6a, respectively, and then the fluid cylinder 11 mounted on the rotary mounts 9 and 10 is fitted. , 12 is attached to the steel box 7.
Each guide ring piece 5a, 6 is installed in the
Attach a again to its original position. As shown in detail in FIG. 5, the rotating mounts 9 and 10 have bases 9a and 10a made of molded steel on the proximal end and guides 9b and 10b made of arcuate molded steel on the distal end, and pillars 9c, 10c, and one end portions of fluid cylinders 11 and 12 are pivotally mounted to the bases 9a and 10a so as to be swingable in the circumferential direction.

In addition, the circumferential shield machine 13 has a cutting edge part 13a formed at the tip of the propulsion side like a general shield machine, and has a propulsion jack 13b built-in, and the cross section is approximately U-shaped with an arcuate outer circumferential side. be.

The circumferential shield machine 13 has its left and right inner surfaces connected to the other ends of the respective fluid cylinders 11 and 12 which are pivotally mounted to the rotary mounts 9 and 10, and can move forward and backward in the radial direction by expanding and contracting the cylinders. .

As mentioned above, the circumferential shield machine 13 attached to the primary segment 4 located at both ends of the planned expansion area 2 removes the front plate 7b of the steel box 7 and transfers the reaction force of the propulsion jack 13b to the steel box 7. The reaction force receiver 8 attached to the rear plate 7c of the box receives it and propels it.

Then, while excavating the earth and sand inside the propelled circumferential shield machine, a circumferential segment 14 having an arcuate outer circumferential side and a substantially U-shaped cross section is installed in the rear space created by the forward movement. As shown in the figure, a piece material 15 is inserted between the guide rings 5 and 6 and bolted together. After that, the reaction force is sequentially received by the newly installed circumferential segments 14 in place of the reaction force receiver, and the rotating mounting base 9 is guided by each guide ring 5, 6 while sequentially removing the segments 3 on the propulsion side. , 10 and the circumferential shield machine 13 attached thereto are propelled along the outer periphery of the normal diameter tunnel 1, as shown in FIG. 7, to carry out a desired enlarged excavation over the entire circumference.

As a result, as shown in FIGS. 8 and 9, an enlarged tunnel 16 having circumferential segments 14 stretched on its inner surface is constructed.

If the expanded tunnel 16 is desired to have a concentric shape with the normal diameter tunnel 1, for example, the fluid cylinders 11 and 12 may be propelled with the fluid cylinders 11 and 12 extended to a certain length. In addition, when it is desired to make the fluid cylinders eccentric as in the above embodiment, the fluid cylinders 11, 1
By expanding and contracting the circumferential shield machine 2 appropriately to a predetermined length, the circumferential shield machine 13 is propelled while moving forward and backward in the radial direction.

In the above embodiment, guide rings were attached in advance to the end faces of the primary segment at both ends of the area to be expanded when constructing a normal diameter tunnel. If the shape of the guide is changed to suit the guide, there is no need to install it in advance, and therefore it becomes possible to arbitrarily set the area to be expanded.

Furthermore, in the above embodiment, the circumferential shield machine is a hollow body with a substantially U-shaped cross section with an open front face on the propulsion side, but it can also be modified to an earth pressure type or mechanical excavator like the conventional shield machine propelled in the axial direction. It is possible.

As mentioned above, the tunnel expansion excavation device of the present application is
By attaching the circumferential shield machine to a rotating mounting base guided by a guide ring via a fluid cylinder and making it possible to advance and retreat in the radial direction, it is possible to create a tunnel of any diameter concentrically with the normal diameter tunnel. It is possible to excavate an enlarged tunnel or an eccentric enlarged tunnel as appropriate.

In the above embodiment, the eccentric circle was exemplified, but
By adjusting the expansion and contraction of the cylinder, it is of course possible to perform enlarged excavation in a circular or elliptical shape, and it is also possible to perform enlarged excavation in a rectangular shape, although the four corners are gently arcuate.

[Brief explanation of the drawing]

Figures 1, 2, 3, 6, and 7 are process explanatory diagrams showing the enlarged tunnel excavation method;
FIG. 4 is a sectional view taken along the line ``-'' in FIG. 3, FIG. 5 is a perspective view of essential parts of the device of the present invention, FIG. 8 is an end view of the enlarged tunnel in the completed state, and FIG. 9 is a sectional view taken along the line ``-'' in FIG. It is. Explanation of symbols, 1...Normal diameter tunnel, 2...Expansion planned area, 3, 4...Primary segment, 5, 6
...Guide ring, 7...Steel box, 8...
Reaction force receiver, 9, 10... Rotating mounting base, 11, 12...
...Fluid cylinder, 13...Circumferential shield machine, 14
...Circumferential segment, 15... Piece material, 16...
...Expanding tunnel.

Claims (1)

[Claims] 1 A device that sequentially removes the primary segments of the area scheduled for expansion installed in a normal diameter tunnel and excavates the outer circumference to enlarge the area, and is installed concentrically over the entire circumference of the primary segments at both ends of the area scheduled for expansion. a guide ring, a rotating mount having a distal end movably engaged along the guide ring and a proximal end equipped with a fluid cylinder that expands and contracts in the radial direction of the normal diameter tunnel; and a propulsive distal end having a blade. A circumferential shield machine having a proximal end fixed to the rotary mount, which excavates along the circumferential direction around the outer periphery of the normal diameter tunnel with a propulsion jack having a built-in mouth and a built-in propulsion jack. Tunnel expansion excavation equipment.