JPS59102087A - Tunnel enlarging and drilling apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

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 tunnel enlarging device capable of arbitrarily enlarging and excavating by varying the diameter to be enlarged or eccentrically excavating it. It concerns drilling equipment.

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.

Conventional methods for carrying out the above expansion work include, for example, digging a vertical shaft from the ground for each area scheduled for expansion, or excavating a tunnel with a normal diameter, and then attaching an enlarged blade to the cutter head of a shield machine when the area scheduled for expansion is reached. The method used was to expand and excavate by adding parts. However, in recent years, the former has become increasingly difficult to implement due to restrictions on the construction of various above-ground and underground structures, especially in urban areas, and it is also costly, as the shafts that have been excavated have to be backfilled, except for a portion, after expansion work. There was also a problem.

In addition, the latter has limitations on the diameter of the excavation because as the diameter of the expanded excavation increases, it becomes difficult to resist the earth pressure from the surrounding surface.
This method has drawbacks such as the inability to carry out the excavation work of the normal diameter tunnel and the enlarged tunnel in parallel, and the work efficiency of normal diameter tunnel excavation decreases because the enlarged blade part must be attached and detached each time. .

Therefore, the applicant of the present application has previously proposed a tunnel expansion excavation method that improves the above-mentioned conventional construction method. This new construction method involves excavating a normal-diameter tunnel using a secondary shield machine, then removing a segment at one end of the area scheduled for expansion, enlarging the excavation, constructing a launch base, and then assembling and installing it at the launch base. A construction method in which an enlarged shield machine is propelled in the axial direction along the outer periphery of a normal diameter tunnel, and the enlarged section is constructed by removing some segments and attaching secondary segments to the enlarged excavation section while widening the section. It is.

Part 1 - This application proposes an expansion tunnel excavation device suitable for performing expanded excavation within a relatively short range in the axial direction, such as the starting base, and the gist of the application is as follows. It is.

This is a device that sequentially removes some segments of the area planned for expansion installed in a normal diameter tunnel and enlarges and excavates the outer periphery of the segment.A cutting edge is formed on the propulsion tip side, and a built-in propulsion jack is used to excavate the normal diameter tunnel. A circumferential shield machine that excavates along the outer circumference of the circumferential shield machine along the circumferential direction, and a circumferential shield machine that rotatably supports the proximal end side of the circumferential shield machine and is concentric over the entire circumference of some segments at both ends of the planned expansion area. [7] The circumferential shield machine has separable upper and lower bodies that fit into each other [7] A fluid cylinder is attached between each body, and expansion and contraction adjustment of the fluid cylinder is provided. A tunnel enlarging excavation device characterized in that the circumferential shield machine for enlarging excavation is expandable and retractable in the radial direction.

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 expanded and contracted in the radial direction using the built-in fluid jack, it is possible to perform enlarging excavation of any diameter concentrically with the normal tunnel, as well as eccentric enlarging and enlarging 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 the drawings together with the construction method.

1. As shown in FIGS. 1 and 2, some segments 3a on the lower side of some segments 3 in the area 2 to be expanded, which are formed around the outer periphery of the normal diameter tunnel 1, are removed, and The guide ring pieces 5a, 5a on the lower side of the divisible guide rings 5, 6 are installed in advance between the partial segment 3 within the area and the adjacent partial segment 4 outside the planned expansion area. Remove. Then, install a steel box 7 with a rectangular cylindrical frame in position 3a (part of the removed segment), add the required length, press fit it into the ground below using jacks, etc., and sink the steel box 7. After digging out the earth and sand in the box, the bottom plate 7a and the reaction force receiver 8 are respectively attached as shown in FIG.

The steel box 7 mentioned above is for retaining the earth, and may be omitted depending on the soil quality of the ground.

Next, the above-mentioned removal 1. The tag guide ring pieces 5a and 6a have a fourth
As shown in the figure, after the proximal ends of the circumferential shield 1%A are fitted together, the guide link pieces 5a and 6a are reattached to their original positions while being accommodated in the steel box 7.

This circumferential shield machine A has a blade opening 9 formed at the tip of the propulsion side like a general shield machine, and a propulsion jack 10 inside.
is built-in, and the cross section is approximately U-shaped with an arcuate outer circumferential side.

And the circumferential shield machine A of this application is especially designed so that the machine body can be separated.
The upper fuselage 11 and the lower fuselage 12 are fitted into each other, and hydraulic or pneumatic fluid cylinders 13 and 14 whose bases are pivotally connected are attached to both bodies, allowing the fuselage to expand and contract. That is, the fluid cylinder 13.1
4. In the most retracted state, the height of the fuselage is 1 no. 1 as shown in Figure 4A, and in the most extended state, the height of the fuselage is L2 as shown in Figure 4A. It is possible to carry out expanded excavation within the range.

As mentioned above, the circumferential shielding machine A is rotatably mounted on the guide rings 5 and 6 at the proximal end, which are attached to the partial segments 4 located at both ends of the planned expansion area 2, and
As shown in the figure, the front plate 7b of the steel box 7 is removed and the reaction force of the propulsion jack 100 is initially applied to the steel box θλ rear plate 7c.
The circumferential shield machine A is propelled by the reaction force received by the reaction force receiver 8 mounted on the

Then, while excavating the earth and sand inside the propelled circumferential shield machine, a circumferential segment 15 with an arcuate outer circumferential side and a U-shaped cross section is created in the space behind the shield machine created by the forward movement.
are installed, and their proximal ends are fixed to the guide links 5 and 6, respectively. After that, the reaction force is sequentially received by the newly installed circumferential segment 15 instead of the reaction force receiver 8,
While removing some of the inner segments 3 one after another, the circumferential shield machine A guided by each guide ring 5 and 6 is propelled along the outer periphery of the normal diameter tunnel 1 to perform the desired enlarged excavation over the entire circumference. It is something.

For example, when enlarging excavation concentrically with the normal diameter tunnel 1, it is sufficient to propel the body of the circumferential shield machine at a desired constant height using the fluid cylinders 13, 14.

In addition, when excavating an enlarged tunnel 16 having an eccentric circle with the center 02 relative to the center 01 of the normal diameter tunnel 1 as shown in FIG. 6, the fluid cylinders 13 and 14 are The height of the fuselage is set to the most contracted height Ll, and the height of the fuselage is set to L2, which is the maximum extension of the fluid cylinders 13 and 14 at the top of the drawing, which is the maximum excavation diameter, and the height of the fuselage is gradually increased or decreased in the middle part. Perform excavation.

In this case, the aircraft height is increased and the radial direction is expanded during excavation) r, 2-r
, , are made to match the center deviation 02 01. The enlarged excavation diameter circumference shield machine A and the rear plate 7c of the steel box 7
is dismantled and removed, and an enlarged tunnel 16 with a circumferential segment 15 stretched over its inner surface as shown in FIGS. 7 and 8 is constructed. If it is desired to construct a longer expanded tunnel in the axial direction using the expanded tunnel 16 as a starting point, the applicant may propel the vehicle in the axial direction along the outer periphery of some segments as previously proposed by the applicant. An enlarged shield machine is installed, and the front plate 15a of the circumferential segment is removed to perform enlarged excavation along the direction of the arrow. still,
In the above embodiment, when excavating a normal diameter tunnel, guide rings were attached in advance to the end faces of some segments at both ends of the area scheduled for expansion. If the proximal end of the circumferential shield machine is made to protrude inward by this amount so as to be installed on the inner surface of the segment, it can be installed during expansion work, so it is recommended that it be installed in advance at least when excavating a tunnel with a normal diameter. Therefore, it is possible to arbitrarily set the area to be expanded.

Further, it is also possible to add this guide ring each time a segment of the area to be expanded is successively removed along the circumferential direction when performing expansion work.

Further, the circumferential shield machine of the above embodiment has a hollow body with a substantially U-shaped cross section with an open front face on the propulsion side, and is mainly used for excavating the ground by hand digging, etc. However, the conventional shield propelled in the axial direction Similar to the machine, it is also possible to modify it to an earth pressure type or mechanical excavator.

As mentioned above, the tunnel expansion excavation device of the present application has a circumferential shield machine that is propelled along the circumferential direction by a guide ring, which can be expanded and contracted in the radial direction. It is possible to excavate enlarged tunnels and eccentric enlarged tunnels as appropriate.

Oka: In the above embodiment, an eccentric circle was illustrated, but by adjusting the expansion and contraction of the cylinder, it is possible to perform enlarged excavation of a concentric circle or an ellipse. It is also possible to do so.

[Brief explanation of the drawing]

Figures 1, 2, 3, 5, and 6 are process explanatory diagrams showing the enlarged tunnel excavation method, and Figure 4A is a front view of the circumferential shield machine of the present invention in a reduced state. , FIG. 4B is a front view of the shield machine of the present invention in an extended state, FIG. 7 is an end view of the enlarged tunnel in a completed state, and FIG. 8 is a sectional view taken along the line ■--■ in FIG. 7. [Explanation of the title] 1...Normal diameter tunnel 2...Expansion planned area 3, 4
...-Next segment 5, 6...Guide ring 7...Steel box 8...Reaction force receiver 9...Blade portion 1o...Propulsion jack 11...Upper body 12. ...Lower fuselage 13.14...Fluid cylinder 15...Circumferential segment 16...Enlarged tunnel A...Circumferential shield machine Ll, L2...Height of the fuselage 01, 02...Tunnel Center 11 - Figure 1 Figure 2 Figure 3 Figure 4A Figure 48 Figure 5 Figure 6

Claims (1)

[Claims] A device for sequentially taking out some segments of a planned expansion area laid out in a normal diameter tunnel and enlarging and excavating the outer periphery thereof, which has a cutting edge formed on the tip side of the propulsion and a built-in A circumferential shield machine that excavates the outer periphery of the normal diameter tunnel along the circumferential direction with a propulsion jack, and a partial segment at both ends of the expansion planned area that rotatably supports the proximal end side of the circumferential shield machine. The circumferential shield machine includes a guide ring installed concentrically around the entire circumference, and the circumferential shield machine has separable upper and lower bodies fitted together, and a fluid cylinder is installed between each body, A tunnel enlarging excavation device characterized in that the circumferential shield machine for enlarging excavation can be expanded and contracted in the radial direction by adjusting the expansion and contraction of a fluid cylinder.