JP3879105B2 - Shield connection method to existing tunnel - Google Patents

Description

  The present invention relates to a shield joining method to an existing tunnel for docking a new shield tunnel in a direction intersecting with the existing tunnel.

Conventionally, as a method of docking a new tunnel having a smaller diameter than an existing tunnel, cutting is performed at the inner peripheral position of the skin plate 2a of the shield machine 2 of the new tunnel 1 as shown in FIGS. The cutter ring 4 to which the working bit 3 is fixed is installed so as to be able to move forward, and the shield ring machine 2 is stopped at a position close to the existing tunnel 5 while the cutter ring 4 is rotated. Then, the existing tunnel lining 5a is cut into a circle, and then the cutter ring 4 is removed from the existing tunnel 5 side, the inside of the shield machine is dismantled, leaving the cutter ring 4 and the skin plate 2a. There is a method of forming the lining 1a on the peripheral surface (for example, Patent Document 1).
JP-A-10-280867

  In the conventional methods described above, since earth pressure and water pressure act on the existing tunnel in the radial direction to maintain the balance, this balance is lost due to the lining cutting at the time of joining the new tunnel. May lead to a bad state.

  In addition, when rotating the cutter ring and advancing while cutting with the cutting bit at the tip thereof, it is necessary to prevent the cutting groove and the cutter ring from competing with each other, and since it is necessary to drain the cutting waste, the width is larger than the thickness of the cutter ring. Therefore, it is necessary to overcut the cutting groove. For this reason, a gap is formed between the outer surface of the cutter ring and the inner surface of the cutting groove, and when cutting is completed, groundwater runs through the gap and generates water in the tunnel. The problem arises.

  In view of such a conventional problem, the present invention can cut the existing tunnel lining while maintaining a stable state without losing its balance, and the water stop after the completion of the cutting is discharged into the tunnel. It was made for the purpose of providing a shield connection method to an existing tunnel that can be easily and completely performed without any problems.

  The feature of the present invention for solving the conventional problems as described above and achieving the intended purpose is to use a shield machine having a rotatable cutter ring with a cutting bit at the tip, In the shield connection construction method to the existing tunnel that excavates a new tunnel in the intersecting direction and forms a through hole by cutting the lining of the existing tunnel by advancing the cutter ring at a position close to the existing tunnel, On the inner surface of the existing tunnel connection position of the existing tunnel, when the cutting of the existing tunnel lining is completed by the cutter ring, the end of the cutter ring has a thickness that does not protrude into the existing tunnel or a strength comparable to this. A covering material layer made of a synthetic resin material is formed in advance, and the existing tunnel is covered with the cutter ring. After cutting to the middle of the fine dishing material layer is to be opened through holes by removing the cutter ring inner lining and dishing material layer of the existing tunnel.

  As described above, in the shield connection method to the existing tunnel according to the present invention, when the cutting by the cutter ring of the existing tunnel lining is completed on the inner surface of the existing tunnel connection position of the existing tunnel, the tip of the cutter ring However, the construction material layer made of a concrete material with a thickness that does not protrude into the existing tunnel or a synthetic resin material having the same strength as this is formed in advance, and this is cut by the cutter ring. The lining at the connection position is reinforced with the mounting material layer, and the cutting is performed in a stabilized state, so that the cutting operation can be performed safely.

  Next, an embodiment of the present invention will be described with reference to FIGS.

  In the figure, 10 is an existing tunnel, 11 is a new tunnel to be docked with respect to the existing tunnel, and 12 is a shield machine for excavating the new tunnel.

  The shield machine 12 includes a cutter ring 14 that can be pushed forward inside the skin plate 12a. A cutting bit 15 for overcutting the inside and outside of the cutter ring 14 is fixed to the tip of the cutter ring 14, and although not shown, cooling and cutting debris are discharged from the tip. The water for making it come to be able to be jetted.

  Although not shown in the drawing, the cutter ring 14 is rotated together with the cutter head 13 and is incorporated into the front side of the skin plate 12a by the pushing means so as to be pushed out.

  Next, a shield connection method using the shield machine will be described.

Prior to cutting with the cutter ring, as shown in FIGS. 1 and 2, a building material layer 16 on which concrete is placed is installed on the inner surface of the connection position of the existing tunnel 10. When the cutting material 14 is in a state in which the cutting of the lining 10a of the existing tunnel 10 has been completed by the advancement of the cutter ring 14, the thickness and the width of a certain thickness or more remain on the tip side of the cutter ring 14. Mold.

Moreover, Ready-To-Eat material layer 16 is to form by pouring concrete, Saishi the pouring of the concrete, to cut position water stopping material injection pipe 17 therein, a fixed interval Buried in As shown in FIG. 4, the pipe 17 has a U-shaped folded portion 17 a cut by a cutter ring 14, and the cut portion is formed in the radial direction of a circular cutting groove 18 formed by the advancement of the cutter ring 14. It is buried so as to be opened on the outer surface. The pipe 17 is provided with valves 19 and 19 in tunnel leading portions 17b and 17b at both ends.

  As shown in FIG. 3, in the state in which the serving material layer 16 is formed and the existing tunnel 10 is reinforced from the inside, the cutter ring 14 is rotated and advanced, and the remaining ground and the existing tunnel 10 are The lining 10 a is cut, and a circular cutting groove 18 is formed in the serving material layer 16. After the lining 10a of the existing tunnel 10 is completely cut in this way, the folded portion 17a of the pipe 17 for water-stopping material injection is cut by further cutting the laying material layer 16.

  The pipe 17 is cut by opening a valve 19 at one end of the pipe, and when the pipe 17 is cut by the cutter ring 14, cooling water for cutting is ejected, and the cutting can be confirmed. Close the valve after confirmation.

  In this way, it is confirmed that the pipe 17 is cut, and the cutting by the cutter ring 14 is stopped. At this time, the cutter ring 14 is in a state of being spanned between the existing tunnel 10 and the skin plate 12a in a state where the tip is inserted into a cutting groove 18 obtained by cutting the serving material layer 16 in the existing tunnel 10 into a circle. .

  Thereafter, as shown in FIG. 4, the water stop material 21 is injected from the pipe 17 opened on the outer peripheral surface side of the cutter ring 14. Thereby, the water stop material 20 is filled in the gap between the outer surface side of the cutter ring 14 and the cutting groove 18, and water is stopped between the existing tunnel lining 10 a and the outer peripheral surface of the cutter ring.

  After this water stop operation is completed, as shown in FIG. 5, the inner portion of the cutter ring 16 of the laying material layer 16 is destroyed from within the existing tunnel 10 using human power or an excavator, and the existing portion in the cutter ring is removed. The tunnel lining 10a and ground soil and sand are removed, and the shield machine 12 is dismantled and transported, leaving the cutter ring 14 and the skin plate 12a. Note that the shield machine 12 may be disassembled and the existing tunnel lining 10a and the above-described laying material layer 16 may be removed from the inside of the new tunnel 11 before the removal of the above-described inner portion of the laying material layer 16 cutter ring.

  Thereafter, as shown in FIG. 6, a necessary covering 11a is formed in the skin plate 12a and the cutter ring 14, and the connection between the existing tunnels 10 and 11 is completed.

  In the above-described example, the pipe 17 for injecting the water-stopping material is folded and embedded in a U shape. However, as shown in FIG. 7, the position intersecting the cutting groove 18 so as to be on the inner peripheral surface side of the cutter ring. The other end side may be led out into the existing tunnel 10.

  In addition, the resin material layer 16 can be made of concrete or a synthetic resin material having an equivalent strength.

It is sectional drawing which shows the state before the cutting by the cutter ring in the shield connection construction method concerning this invention. It is a front view which shows the serving material layer part same as the above. It is sectional drawing which shows the cutting state by a cutter ring same as the above. It is an expanded sectional view which shows the backfill material injection | pouring state same as the above. It is sectional drawing which shows the backfilling material layer removal process same as the above. It is sectional drawing which shows a new tunnel connection completion state same as the above. It is sectional drawing which shows the other example of the pipe for backfill material injection | pouring used for this invention method. It is sectional drawing which shows the state before the connection of the conventional method. It is sectional drawing which shows the cutting state by a cutter ring same as the above. It is sectional drawing of a connection completion state same as the above.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Existing tunnel 10a Covering 11 New tunnel 11a Covering 12 Shield engraving machine 12a Skin plate 13 Cutter head 14 Cutter ring 15 Bit 16 Placing material layer 17 Pipe 17a Folding part 17b Deriving part 18 in tunnel Tunnel 19 Valve 20 Water stop material

Claims (1)

Using a shield machine with a rotatable cutter ring with a cutting bit at the tip, excavate a new tunnel in a direction intersecting the existing tunnel, and advance the cutter ring at a position close to the existing tunnel. In the shield connection method to the existing tunnel that forms a through hole by cutting the lining of the existing tunnel,
On the inner surface of the existing tunnel connection position of the existing tunnel, when the cutting of the existing tunnel lining is completed by the cutter ring, the thickness of the cutter ring is such that the tip of the cutter ring does not protrude into the existing tunnel, or the same strength as this. A covering material layer with a synthetic resin material having the above-mentioned structure is formed in advance, and the existing tunnel lining and the covering material layer cutter are cut by the cutter ring to the middle of the lining of the existing tunnel and the covering material layer. A shield connection method to an existing tunnel, characterized by removing the inside of the ring and opening a through hole.

Images