JPH0723677B2 - Shield tunnel joining method - Google Patents

Description

The present invention relates to a method for joining shield tunnels excavated from both sides of a planned excavation area by a shield excavator.

(Prior Art) Conventionally, as a joining method of this kind, shield excavators c and c ′ provided with cutter parts b and b ′ from both sides of a planned excavation area a as shown in FIGS. 5 and 6, respectively. The shield tunnel d is excavated by excavation, and when both shield excavators c and c ′ reach the planned joining point e of both shield tunnels d, the ground around both shield excavators c and c ′ After constructing the reinforced ground by using a known ground improvement method such as injecting the ground strengthening agent f into the ground, the cutter parts b and b'of the shield excavators c and c'are dismantled and removed, and the cutter parts b and b Generally, the shield segment h is lined on the exposed surface g of the ground corresponding to the removed portion of b'and the inner peripheral surfaces of both shield excavators c, c '.

(Problems to be solved by the invention) The conventional method for joining shield tunnels is such that after removing the cutter parts b, b'of both shield excavators c, c ', the ground corresponding to the removed parts is removed. Since the soil is exposed, the ground may fall during the dismantling and removing work of the cutter parts b, b ′ and the lining work of the shield segment h even if the ground is strengthened by injecting the ground strengthening agent into the ground. Yes, in that case, removal work or lining work becomes extremely dangerous. Moreover, the ground at the joint of both tunnels cannot be improved until after the two shield mowers c, c'arrive at the planned junction point e of the shield tunnel d, and the cutter parts b, b cannot be improved after the ground improvement. Since the dismantling and removal of ′ cannot be carried out, it takes a lot of time in the construction period and there is a problem that the work efficiency is poor.

It is an object of the present invention to provide a method for joining shield tunnels, which enables complete removal of the cutter portion of a shield trench machine and which has good work efficiency.

(Means for Solving Problems) The present invention provides a method for joining both shield tunnels, which are excavated by excavating shield shield machines equipped with cutters from both sides of a planned excavation area. Build a starting base for the expanded shield moat behind the shield mower that arrived first at the planned joining point, and then expand the engraved shield moat from the starting base to the planned junction point of the shield tunnel and expand the shield. The tunnel is excavated, and the other shield excavator that arrives at that point is further advanced from that position, and the one shield excavator that is in contact with this is retracted to expand both shield excavators in the shield tunnel. After dismantling and removing the cutter parts of both shield starters, it is special to fill the gap between the expanded shield tunnel and both shield excavators with filling material. To collect.

(Example) The present invention will be described below with reference to the drawings.

1 to 4 show an embodiment of the present invention.

First, from the both sides of the planned excavation area (1) of the tunnel toward the planned joining points P of the tunnel, respectively, the shield part (2a) (2b) of the shield part (3) is manufactured by the conventional shield excavation method.
The ground is excavated in a) and (3b), and a shield tunnel (5) with a shield segment (4) on the inner surface is created.

Then, when one shield excavator (2a) arrives first at the planned joining point of the tunnel, the ground around the shield tunnel (5) behind the shield excavator (2a) is excavated in the circumferential direction. And expand Shield Horishinki (6) starting base (7)
Then, the expansion shield moat advance machine (6) is assembled in the starting base (7), and the starting base (7) is formed by the conventional expansion shield construction method in the cutter part (8) of the expansion shield moat advance machine (6). ) To the planned joining point P of the tunnel along the outer circumference of the shield excavator (2a) to excavate the ground to form an enlarged shield tunnel (10) with a shield segment (9) on the inner peripheral surface. ..

Next, when the one shield mower (2a) that arrives first at the planned joining point P reaches the other shield mower (2b),
The latter shield moat (2b) is replaced by both shield mowers (2b).
a) A shield boring machine (2
While advancing toward the a) side, the shield excavator (2a) that is in contact with the shield excavator (2a) is retracted, and both shield excavators (2a) (2b) are moved to predetermined positions in the enlarged shield tunnel (10). Then, after dismantling and removing the cutter parts (3a) (3b) of the two shield mowers (2a) (2b), the inner surface of the enlarged shield tunnel (10) and both shield mowers (2a) (2b) From the removed part (12) of both cutter parts (3a) (3b) with the cut part (8) of the enlarged shield moat machine (6) buried in the space (11) between the outer surface of After filling the filling material (13) such as cement, double shield mower (2a)
Line the shield segment (14) on the inner surface of (2b).

In addition, the filling material (1) into the space (11) between the enlarged shield tunnel (6) and both shield excavators (2a) and (2b)
Expanding the filling of 3) May be done after dismantling and removing the cutter part (8) of the shield moat machine (6). When doing so, the cutter section (8) of the enlarged shield trench machine (6) can be reused.

Further, (15) in the figure is a pedestal for both cider mowers (2a) (2b) arranged at a lower position in the enlarged shield tunnel (10).

(Effects of the Invention) As described above, according to the present invention, a starting base for the expanding shield machine is constructed behind the one shield mower that has arrived first at the planned joining point of both shield tunnels, and is expanded from the starting base. Enlarge the shield tunnel machine to the planned junction point of the shield tunnel and excavate the enlarged shield tunnel, and then move the other shield tunnel machine that arrived at that point further forward from that position and make contact with it. After retreating the shield mower and relocating both shield mowers into the expanded shield tunnel, and then dismantling and removing the cutter parts of both shield starters, the gap between the expanded shield tunnel and both shield mowers Since the parts are filled with the filling material, it is possible to dismantle and remove the cutter parts of both shield excavators in the enlarged shield tunnel. Therefore, since the ground is not exposed at the removed part of the cutter part, the removal work of the cutter part can be performed very safely, and along the outer circumference of one shield excavator that arrived first at the planned joining point of both shield tunnels. Since the construction of the expanded shield tunnel can be done prior to the arrival of the other shield excavator at the planned joining point, the construction period can be shortened and work efficiency can be improved. Since the expanded shield tunnel is provided, the joint portion can have a strong double structure, and there is an effect that no reinforcement work is required inside the joint portion.

[Brief description of drawings]

1 to 4 are explanatory diagrams of respective steps showing an embodiment of the present invention, and FIGS. 5 and 6 are explanatory diagrams of respective steps of a conventional example. (1)… Planned excavation area (2a)… One shield trench machine (2b)… Other shield trench machine (3a) (3b)… Cutter section (5)… Shield tunnel (6)… Enlarged shield trench Progress (7)… Starting base, (10)… Enlarged shield tunnel (11)… Gap, (13)… Filling material P… Planned joining point

Claims (1)

[Claims] 1. In a method of joining both shield tunnels, which are excavated by excavating shield shield machines equipped with cutters from both sides of a planned excavation area, one shield that arrives first at a planned joining point of both shield tunnels. Build a start base for the expanded shield moat behind the moat and excavate the expanded shield tunnel by excavating the expanded shield moat from the starting base to the planned joining point of the shield tunnel. While moving the other shield excavator that arrived later forward from that position, the one shield excavator that abuts against this is retracted and both shield excavators are relocated into the expanded shield tunnel, and then both shield excavators are started. After dismantling and removing the cutter part of the shield tunnel, the gap between the enlarged shield tunnel and both shield excavators is filled with a filling material. Method.