JP3105349B2 - Existing tunnel removal shield machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shield machine for removing an existing tunnel, which is no longer required.

[0002]

2. Description of the Related Art For example, when excavating a shield tunnel, an existing buried pipeline on the route is sometimes removed. In the conventional method of removing an existing buried pipe, as shown in FIG. 6, a steel sheet pile 3 or the like is driven into the steel sheet pile 3 from the road surface 1 and the underground buried pipe 2 is first secured. Next, the inside of the shaft is dug down to form a shaft 4, and the steel sheet pile 3 is attached to the mountain retaining material 5.
To prevent ground collapse. Then, underground pipe 2
It is common to remove and backfill after removal. Further, the existing buried pipe 6 which is not removed but is exposed in the shaft 4 is hung by the mountain retaining member 5 and is hung by the protection member 7 to be protected.

[0003]

In recent years, as new large-diameter shield tunnels are often planned deep underground, it has become necessary to remove existing buried pipes deep underground. However, the above-mentioned conventional method of removing existing buried pipes is good when the buried pipes are shallow, but there are various problems as follows when removing buried pipes deep underground.

[0004] The depth of the mountain is deep and the construction cost is high. During construction, the road will be occupied and traffic congestion will occur. Often, other buried pipes in shallower locations must be protected. Accordingly, the present invention has been made in view of the above-mentioned conventional problems, and provides an existing tunnel removal shield machine that removes an existing buried pipe by using a shield method, thereby providing a conventional problem. The purpose is to solve.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a single cylindrical shell which is movably inserted into an existing pipe to be removed with its rear end covered by a partition wall and opened at its front end. A shell having an outer diameter larger than that of the shell, being axially movably supported by the axial center of the shell, and having a bit facing the end face of the existing pipe at the outer periphery facing the shell. An existing tunnel removal shield machine equipped with a rotating cutter head, a slide jack fixed in the shell body for pushing the rotating cutter head against the existing pipe, and at least a gripper for fixing the shell body to the existing pipe inner wall while the slide jack is being propelled. It is.

[0006]

[Function] The shell is fixed in the existing pipe by the gripper, and the rotary cutter head is rotated and advanced by the slide jack. The bit drills while excavating and cutting the end face of the existing pipe. At the same time, the crushed pieces of the existing pipe and the filler fed from the outside are injected into the gap formed behind the rotary cutter head. When the slide jack is fully extended, the gripper is released and the shell is advanced a certain distance by towing or other means. At the same time shrink the slide jack.

In this way, by repeatedly removing the end of the existing pipe, excavating the shell, and removing the end of the existing pipe, the existing pipe underground can be removed and backfilled by the shield method.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of one embodiment of the present invention. The existing tunnel removal shield machine 10 has a main body formed of a cylindrical shell 14 having a rear end covered with a partition wall 12 and an open front end. The outer diameter of the shell 14 is formed slightly smaller than the inner diameter of the existing pipe 2 to be removed, and is inserted into the existing pipe 2. A sealing material 15 and a spacer 16 are attached to the outer diameter surface of the inserted shell 14, and are interposed between the inner wall of the existing pipe 2. Since the shell 14 runs inside the existing pipe 2, the spacer 16 is preferably a wheel-shaped spacer. The lip of the sealing member 15 is inclined in a direction in which water from the rear of the shell 14 can be effectively stopped (self-sealing), and the inclination coincides with the traveling direction of the shell 14 and slides at the same time. It is configured to reduce the resistance.

A gripper 17 is provided on the shell 14, and the shell 14 is fixed to the existing pipe by pressing the inner wall of the existing pipe 2 by projecting from the outer diameter surface of the shell 14 as necessary. Like that. A rotating cutter head 18 having a larger outer diameter than the shell 14, that is, an outer diameter substantially equal to the outer diameter of the existing pipe 2 is disposed close to the outside of the partition wall 12 at the rear part of the shell 14. Extends through the partition wall 12 to the axial center of the shell 14 and is supported so as to be movable in the axial direction. Unlike the conventional shield device, the rotating cutter head 18 is provided inside the cutter head, that is, the shell 14.
A bit 19 is provided on the outer peripheral portion on the side facing. These bits 19 are arranged so as to face the end face of the existing pipe 2 to be removed. Further, it is preferable that the rotary cutter head 18 has a structure in which a large slit is opened so that the cut concrete piece of the existing pipe 2 can easily pass through.

A plurality of slide jacks 21 are attached to the inner wall of the partition wall 12 of the shell 14, and the tip of the movable shaft 21a of the slide jack is supported so that the rotary cutter head 18 can slide in the axial direction. Rotary shaft 18
a. In this embodiment, the injection pipe 22 is provided through the rotary cutter head 18 so that the filler can be injected into the rear space while rotating the injection pipe 22 together with the rotary cutter head 18.

A cable 2 as a traveling means is provided on the shell 14.
3 is connected, and is advanced while being pulled by a winch (not shown) installed inside the existing pipe 2. However, as the traveling means of the shell 14, other traveling means provided with a motor or the like on the shell 14, for example, may be provided to be self-propelled. Next, the operation will be described.

The construction procedure using the existing tunnel removal shield machine 10 is as follows. First, the shafts 4 and 4 are installed at the start point A and the end point B of the removal point of the existing pipe 2. The piles 3 are cast, and the existing pipe 2 is in the way, and the places where the piles 3 could not be cast were subjected to ground improvement C and then the inside was excavated (FIG. 2).

The existing tunnel removing shield machine 10 is assembled in the shaft 4 at the starting point A, and the existing tunnel removing shield machine 10 is assembled to the existing pipe 2 at the beginning of the removed portion of the existing pipe 2 (FIG. 3). Backfill the inner space of the shaft 4 at the starting point A with sand and buried F,
Pull out the pile 3 (Fig. 4). The shaft 4 at the end point B is used for entry and exit of objects and people between the outside and the inside of the existing tunnel removal shield machine 10.

While breaking the existing pipe 2, the shaft 4 at the end point B
Of the existing tunnel removal shield machine 10 toward the side (FIG. 5). That is, first, the gripper 17 is extended from the shell 14 of the existing tunnel removal shield machine 10,
The shell 14 of the existing tunnel removing shield machine 10 is fixed in the existing pipe 2 by pressing the inner wall against the existing pipe 2 in the radial direction. Thereafter, the movable shaft 21a of the slide jack 21 is extended while the rotary cutter head 18 is driven to rotate. Thereby, the rotary cutter head 18 can be advanced while cutting the end face of the existing pipe 2 with the bit 19. Simultaneously with the advance, a clearance space is created behind the rotary cutter head 18. Concrete fragments or the like of the existing pipe 2 cut by the bit 19 of the rotary cutter head pass through the large slit of the rotary cutter head 18 and are discharged into the gap space. At the same time, for example, a mortar-based filler is injected from the injection pipe 22 into the space. In this embodiment, at this time, since the injection pipe 22 is rotating together with the rotary cutter head 18, the filler discharged from the injection pipe 22 and the concrete fragments of the existing pipe are well dispersed and uniformly distributed. The unique effect that the space can be filled while mixing is obtained.

When the movable shaft 21a of the slide jack is fully extended, the gripper 17 is loosened to release the fixing of the shell 14. Next, the shell 14 is pulled while the cable 23 is wound by the winch of the traveling means. Since the shell 14 rides on the wheel-shaped spacer 16, the shell 14 is lightly pulled and advances in the existing pipe 2. At this time, since the sealing material 15 is inclined in a direction that does not go against the traveling direction of the shell 14, its sliding resistance is extremely small and does not hinder the running of the shell 14. When the traveling means is a self-propelled type, the shell 14 naturally travels by itself. The travel distance of the shell 14 is limited to the stroke length of the slide jack 21. Then, as the shell 14 advances, the movable shaft 21a of the slide jack is contracted. Subsequently, the gripper 17 is extended again,
The rotary cutter head 18 is rotated to move to the next excavation cycle.

As described above, the shell 14 is fixed, the end of the existing pipe 2 is broken by the rotation of the rotary cutter head 18 and the excavation of a predetermined distance, and the gap space generated behind the rotary cutter head 18 is filled. By repeating the cycle of releasing the fixing of the shell 14, traveling for a certain distance, and fixing the shell 14 again, the existing underground pipe 2 from the starting shaft 4 at the starting point A to the shaft 4 at the ending point B is removed and backfilled. Can be performed in a shielded manner.

[0017]

As described above, the shield machine for removing an existing tunnel according to the present invention has a shell movably inserted into an existing pipe to be removed and an outer diameter larger than the shell. A rotating cutter head, which is axially movably supported by the axial center of the shell and has a bit on the outer peripheral side facing the shell facing the end face of the existing pipe, and is fixed in the shell to rotate At least a slide jack for pushing the cutter head against the existing pipe, and a gripper for fixing the shell to the inner wall of the existing pipe, and filling in a gap space formed rearward while breaking the end of the existing pipe with the rotary cutter head. Is repeated while traveling in the existing pipe by a predetermined distance to remove the existing pipe. Therefore, the following effects can be obtained.

Since it is not necessary to carry out the broken concrete waste of the existing pipe to the surface of the ground, it is economical because no excavated soil treatment costs and transportation costs are required. Excavated soil and concrete debris do not enter the inside of the existing tunnel removal shield machine, so a safe and clean work space can be maintained. Because it is underground work, roads are not occupied during construction and road traffic is not obstructed.

[0019] The construction cost does not increase in the shoring work, there is no need to protect other buried pipes in a shallow place, and there is no need to circulate the buried pipes. Can be saved.

[Brief description of the drawings]

FIG. 1 is a sectional view schematically showing one embodiment of the present invention.

FIG. 2 is an explanatory view of a construction procedure using an existing tunnel removal shield machine shown in FIG. 1;

FIG. 3 is an explanatory view of a construction procedure.

FIG. 4 is an explanatory view of a construction procedure.

FIG. 5 is an explanatory view of a construction procedure.

FIG. 6 is a diagram illustrating an example of a conventional existing tunnel removal work.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Existing tunnel removal shield machine 12 Partition wall 14 Shell 17 Gripper 18 Rotary cutter head 19 Bit 21 Slide jack 22 Injection pipe

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Takashi Hagiwara Taisei Corporation, 1-25-1, Nishi-Shinjuku, Shinjuku-ku, Tokyo (58) Field surveyed (Int. Cl. ⁷ , DB name) E21F 15 / 00 E21D 9/06 301 E21D 9/06 311 E21D 9/08

Claims (1)

(57) [Claims] 1. A single cylindrical shell which is movably inserted into an existing pipe to be removed with its rear end covered by a partition wall and whose front end is opened, and having a larger outer diameter than the shell. A rotary cutter head that is supported by the axial center of the body so as to be movable in the axial direction, and that has a bit on the outer peripheral portion facing the shell and that faces the end face of the existing pipe; and the rotary cutter fixed to the shell and fixed to the rotary body. An existing tunnel removal shield machine comprising at least a slide jack for propelling a head against the existing pipe, and a gripper for fixing a shell to an inner wall of the existing pipe while the slide jack is being propelled.