JPH0610598A - Existing tunnel withdrawing shield machine - Google Patents

Abstract

PURPOSE:To make it possible to withdraw the existing buried pipe in the ground by means of a shield method. CONSTITUTION:A backfilling injection pipe 30 supplying backfiller to spaces made backward of a shell body after a driving jack 22 and the existing buried pipe are withdrawn is provided to the inside of the shell body 15 having double pipe construction constituted of the rear trunk 13 covering the rear end and the front trunk 14 combined thereto in an expansible manner through a seal member 16 and equipped with a rotary cutter head 19 on the front end. Earth on the periphery of the existing pipe is excavated by the rotary cutter head 19, and the existing pipe taken into the shell body 15 is withdrawn while driving gradually the rear trunk 13 and front trunk 14 alternately through the driving jack 22 to drive forward. The spaces made backward of the shell body 15 are filled with backfiller supplied from the backfilling injection pipe 30.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an existing tunnel removal shield machine for removing an unnecessary existing buried pipe.

[0002]

2. Description of the Related Art For example, when excavating a shield tunnel, an existing buried pipeline on the route may be removed. As shown in FIG. 9, the conventional method for removing an existing buried pipe is to mount a steel sheet pile 3 or the like between the road surface 1 and an underground underground buried pipe (hereinafter simply referred to as “existing pipe”) 2 to create a mountain cleat. To do. Then, the inside of the shaft is dug down to the vertical shaft 4
Is formed and the steel sheet pile 3 is supported by the mountain retaining member 5 to prevent the ground from collapsing. After that, it is common to remove the existing underground pipe 2 and backfill after the removal. The existing pipe 6 that is not removed and is exposed in the vertical shaft 4 is protected by being suspended from the mountain retaining member 5 by the suspension protection member 7.

[0003]

In recent years, as new large-diameter shield tunnels are often planned deep underground, it has become necessary to remove existing pipes buried underground. However, the conventional method for removing an existing pipe described above is good as long as the existing pipe is shallow, but has the following various problems with respect to removing the existing pipe deep underground.

[0004] The mountain stay becomes deeper and the construction cost becomes higher. During construction, the road will be occupied, leading to traffic congestion. It is often necessary to protect other existing pipes at shallower depths. Therefore, the present invention has been made by paying attention to the above-mentioned conventional problems, and the conventional problems can be solved by providing an existing tunnel removal shield machine for removing an existing pipe by using a shield construction method. The purpose is to resolve.

[0005]

SUMMARY OF THE INVENTION According to the present invention for achieving the above object, a rear body whose rear end is covered by a partition wall, and a rear body which is extensible and retractable via a seal member and should be removed at the front end. A shell body of a double pipe structure consisting of a front body having an opening into which the end of the existing pipe is inserted, and a rotary cutter head for digging the crust on the outer periphery of the existing pipe, which is arranged on the outer periphery of the opening at the front end of the shell. At least the excavation means provided, the excavation jack mounted inside the shell, and the buried soil injection pipe that penetrates the partition wall at the rear end of the shell and supplies the backfill material to the space after removal of the existing pipe.

[0006]

[Operation] The rear body and the front body of the shell, which has a retractable double-tube structure, are gradually advanced by the expansion and contraction operation of the digging jack to excavate the shell while removing the existing pipe taken into the shell. To go. That is, the excavation jack is extended to press the outer ground which is in contact with the partition wall of the rear trunk. By rotating the rotary cutter head while applying the reaction force to the front body, the outer circumference of the existing pipe is excavated and the front body is propelled by a predetermined distance. The end of the existing pipe taken inside the shield machine by this excavation is broken down and removed by a cutter or other means. The rear body contracts the digging jack and pulls it forward. In this way, the space formed behind the partition wall is filled with the filling material to fill the space. As described above, by excavating the outer circumference of the existing pipe, promoting the shell by excavating the front barrel and pulling the rear barrel, and removing the end of the existing pipe, the existing underground pipe is removed and backfilled. Can be done by a shield method.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of an embodiment of the present invention. The existing tunnel removal shield machine 10 of this embodiment includes a rear body 13 having a rear end covered with a partition wall 12 and a front body 14 having a larger diameter than the rear body 13 and assembled in a nested manner. A shell 15 having a telescopic double-tube structure is provided. The front end portion of the rear body 13 and the rear end portion of the front body 14 are axially slidably coupled to each other, and a seal member 16 is attached to the coupling portion to prevent intrusion of earth and sand or water from the outside. To prevent. In the figure, the front end of the rear body 13 is represented by the front body 14
Although the structure is shown in which the two ends are sandwiched by the rear end portions, the front body 14 side may be sandwiched by the rear body 13 side.

The front end of the front body 14 is an opening 17 into which an existing pipe is taken in, and an excavating means 21 including a rotary cutter head 19 and a driving motor 20 for the rotary cutter head 19 is disposed on the outer periphery of the opening 17. The rotary cutter head 19 of the excavating means 21 has a ring shape and is rotatably disposed on the outer peripheral portion of the opening 17 of the shell 15 via a bearing (not shown), and has a large number of bits 19a on the front surface of the head. ing.
The drive motor 20 of the rotary cutter head 19 is the front body 1
The rotary cutter head 19 is fixed to the inner wall of the rotary unit 4 and rotationally driven via the output gear 24.

Further, inside the shell body 15, the excavation means 21 is provided.
A plurality of excavation jacks 22 are arranged along the circumference as excavation means for advancing together with the shell 15. In this embodiment, the body of the excavation jack 22 is attached and fixed to the inner wall of the front case 14, while the tip of the jack is arranged so as to be locked to the partition wall 12 of the rear case 13. May be fixedly attached to the rear body 13, and the tip of the jack may be arranged so as to be locked to the front body 14.

The shell body 15 of this embodiment further has a concrete cutter 25 as a crushing means for the existing tunnel.
Is equipped with. The concrete cutter 25 is attached to a turning ring 27 which is driven to rotate by a turning motor 26 and is movable in the front-rear direction and is supported by an unillustrated erector device. The concrete cutter 2 is shown in FIG.
Although only the one that cuts the existing pipe 2 into a ring is shown as 5, the swivel ring 27 also cuts the existing pipe 2 in the axial direction.
It may be attached to and used together.

Numeral 30 is an existing tunnel removal shield machine 10.
Is an injection pipe of a filling material used for backfilling the space formed behind the partition wall 12 of the shell body by the excavation of
Reference numeral 0 passes through the existing buried pipe 2 and penetrates the partition wall 12 to open. Reference numeral 31 is a seal interposed between the inner wall of the front case 14 and the existing pipe 2. Next, the operation will be described.

The construction procedure using this existing tunnel removal shield machine 10 is as follows. First, shafts 4 and 4 are installed at the starting point A and the ending point B of the removal location of the existing pipe 2. The mountain retaining pile 3 is driven, and the ground improvement C is applied to the place where the existing pipe 2 cannot be placed due to the hindrance of the existing pipe 2 before excavating the inside (FIG. 2).

The existing tunnel removal shield machine 10 is assembled in the vertical shaft 4 at the starting point A, and the starting end of the removed portion of the existing pipe 2 is taken into the machine (FIG. 3). Backfill the inner space of the shaft 4 at the starting point A with sand and earth F
Pull out the Yamadome pile 3 (Fig. 4). The vertical 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.

The vertical shaft 4 at the end point B while destroying the existing pipe 2.
The existing tunnel removal shield machine 10 is propelled toward the side (Fig. 5). That is, the concrete cutter 25 is driven and the turning ring 27 is driven to move the shell 15
The end portion of the existing pipe 2 taken inside is cut off by a predetermined length and divided into blocks of a transportable size. The divided block is carried out by a carry-out device (not shown) provided inside the existing pipe 2 and discharged outside from the vertical shaft 4 at the end point B (FIG. 6).

Subsequently, the excavation jack 22 is extended and the partition wall 12 of the rear body is pressed. The outside of the partition wall 12 is filled with buried soil, and a forward force is applied to the front body 14 by a reaction force of pressing by the excavation jack 22. In this state, the rotary cutter head 19 of the excavating means 21 is rotated to excavate the natural ground E on the outer peripheral portion of the existing pipe 2 with the bit 19a. The excavation by the rotary cutter head 19 and the removal of the remaining soil are performed by sending and discharging muddy water. As a result, the front body 14 is dug forward. After excavating a predetermined distance, the rotation of the excavation means 21 and the excavation jack 22
Stop the extension operation. With this excavation, the existing pipe 2
The end of the is taken into the opening 17 of the front body 14 (FIG. 7).

Subsequently, the excavation jack 22 is driven in the reverse direction to contract, and the rear body 13 is pulled toward the front body 14. When the front body 14 is pulled, a space is formed behind the partition wall 12. Immediately after this, the filler is supplied from the filling material injection pipe 30 to fill the gap (FIG. 8). By repeating the above operation, the vertical shaft 4 from the starting point A to the vertical shaft 4 at the end point B
It is possible to remove the existing pipe 2 up to and to refill the space after removal.

In the above embodiment, the existing pipe 2
Although the concrete cutter 25 built in the shell body 14 has been described as the crushing means, the abrasive water jet or the like may be used. Further, it is not always necessary to rely on an automatic machine, and a machine operated manually can be used. Further, when the segment is exposed, it can be removed by removing the bolt or the like, the labor for cutting the concrete can be omitted, and the concrete cutter 25 is not necessary.

The existing pipe 2 that can be removed by the existing tunnel removing shield machine 10 is not limited to a concrete pipe, but may be a steel pipe or a brick pipe.

[0019]

As described above, the existing tunnel removal shield machine of the present invention has a retractable double tube structure including a rear body having a bulkhead at the rear end and a front body attached to the rear body. It has a shell structure, and excavates the outer crust of the existing pipe with a rotating cutter head arranged at the front end, extends the excavation jack to advance only the front barrel, and then retracts the excavation jack to pull the rear barrel closer. , It was decided that the space created at that time would be dug back and the end of the existing pipe taken into the shell body would be demolished. Therefore, the following effects can be obtained.

Since it is underground work, the road is not exclusively occupied during construction, and road traffic is not hindered. Construction costs will not be increased due to mountain retaining work, there will be no need to cut underground pipes, and construction costs will be reduced, including trial drilling. Since it is not necessary to install a propulsion device for the existing tunnel removal shield machine 10 inside the existing pipe, work such as transportation of the removed existing pipe can be carried out efficiently, and the work site is neat and worker safety is also secured. It's easy to do.

It is reliable because the removal of the existing pipe can be directly confirmed with the eyes.

[Brief description of drawings]

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

FIG. 2 is an explanatory view of a construction procedure by the existing tunnel removal shield machine shown in FIG.

FIG. 3 is likewise a diagram explaining the construction procedure.

FIG. 4 is likewise an illustration of a construction procedure.

FIG. 5 is likewise an illustration of a construction procedure.

6 is an explanatory view of a cutting process of an existing pipe by the apparatus of FIG.

FIG. 7 is an explanatory diagram of a front torso advancing process in the apparatus of FIG.

8 is an explanatory diagram of a rear body pulling process and a filling material injecting process in the apparatus of FIG.

FIG. 9 is a diagram illustrating an example of conventional existing tunnel removal work.

[Explanation of reference numerals] 10 existing tunnel removal shield machine 12 partition wall 13 rear body 14 front body 15 shell body 17 opening 19 rotary cutter head 21 excavation means 22 excavation jack 30 buried soil injection pipe

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masanori Hirachi 1-25-1, Nishishinjuku, Shinjuku-ku, Tokyo Taisei Corporation

Claims (1)

[Claims] 1. A rear body having a rear end covered with a partition wall, and a front body having an opening into which an end of an existing pipe to be removed is inserted, which is extensiblely attached to the rear body via a seal member. A shell having a double pipe structure consisting of, and a digging means provided with a rotary cutter head for digging the crust on the outer periphery of an existing pipe, which is arranged on the outer periphery of the opening at the front end of the shell, and an excavation jack installed inside the shell. An existing tunnel removal shield machine having at least a buried soil injection pipe that penetrates the partition wall at the rear end of the shell and supplies a backfill material to the space after removal of the existing pipe.