JPH0426557Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] The present invention is designed to operate a widening shielding machine along the outer periphery of the primary shielding segment in the width line direction for the planned widening area in the tunnel where the primary shielding has been performed. This relates to a sealing device for the widening shield construction method, which widens the tunnel by propelling the tunnel.

[Prior Art] Generally, when widening a tunnel by the widening shield method, as shown in Fig. 3A, from the appropriate position of the primary shield segment 2 against the ground 3 in the area where the primary tunnel 1 is to be widened, Concrete 4 was poured to prevent the collapse of the ground 3 and the infiltration of groundwater, and then the required parts 1 were poured as shown in Figure 3B.
Next, the shield segment 2 is removed, and the ground 3 where the concrete 4 is poured is excavated in a circular shape to form a widening base 6. Next, the widening shield machine is installed inside the widening base 6 as shown in Fig. 3C. 7 is installed, a reaction force receiving member 10 is arranged between the shield jack 8 and the rear side wall 5 of the base 6, and the shield machine 7 is propelled.
Area 9 planned for widening is being excavated. still,
11 is a shield frame, 12 is a tail seal,
13 is a cutter, 14 is a cutter drive motor, 15 is a mud removal pipe, and 16 is a widening segment.

[Problems to be solved by the invention] However, when the primary tunnel 1 is widened using such a shield construction method, groundwater from the area 9 scheduled for widening flows from the outer periphery of the shield frame 11 to the reaction force receiving member 10 and the widening process. There was a risk that the liquid would enter the widening base 6 and further into the primary tunnel 1 through the gap between the segment 16 or the side wall 5, or from the reaction force receiving member 10 itself.

In view of these circumstances, the present invention attempts to prevent groundwater from entering the widening base and further into the primary tunnel.

[Means for Solving the Problems] The present invention has a configuration in which a ring-shaped seal member is interposed between the widening base and the outer periphery of the widening shield machine or the constructed widening segment.

[Operation] Therefore, water flowing out from the area scheduled for widening is blocked by the sealing member, and groundwater is prevented from infiltrating into the widening base and further into the primary tunnel.

[Example] Hereinafter, an example of the present invention will be described based on the drawings.

As shown in FIG. 1, in the present invention, a ring-shaped entrance seal member 20 is arranged at the front outer circumference of the shield machine 7 in the propulsion direction of the wide base 6 so as to be in contact with the outer circumference of the shield frame 11 of the shield machine 7. It is. Note that 17 is a sealing member mounting block, 18 is a sealing member presser, and 19 is a filler.

In such a configuration, when the shield machine 7 is propelled to excavate the area 9 scheduled for widening, the seal member 2
0 initially remains in contact with the outer periphery of the shield frame 11, and as the shield machine 7 advances further, it comes into contact with the outer periphery of the constructed widening segment 16, causing water to flow out from the area 9 scheduled for widening. Even if there is water, it can be blocked by the sealing member 20 and groundwater is prevented from entering into the expanded base 6.

FIG. 2 shows another embodiment of the present invention, in which a reaction force receiving member 10 is flatly embedded in the side wall 5 of the widening base 6 in advance, and a widening segment 16 is assembled with the reaction force receiving member 10 first. A ring-shaped sealing member 21 is interposed between the two, for example, by bolts and nuts 22. In addition, the reaction force receiving member 10
Instead, the side wall 5 itself may be processed in advance to have the function of the reaction force receiving member 10, and bolts for mounting the seal member 21 may be embedded in the side wall 5.

In this case, groundwater from the planned widening area 9 will infiltrate up to the outer periphery of the shield frame 11 and the widening segment 16, but the seal member 21
This prevents further intrusion into the widened base 6.

It should be noted that the present invention is not limited to the above embodiments, and it goes without saying that various changes can be made without departing from the gist of the present invention.

[Effects of the invention] As explained above, according to the sealing device for the widening shield construction method of the present invention, since the sealing member is interposed between the widening base and the shield machine outer periphery or the constructed widening segment, the shield machine It is possible to prevent groundwater from entering the primary tunnel from the widening base, which requires excavation work.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of one embodiment of the present invention, FIG. 2 is an explanatory diagram of another embodiment of the present invention, and FIGS. 3A, 3B, and 3 are explanatory diagrams of the widening shield method. 1 is the primary tunnel, 2 is the primary shield segment, 3 is the ground, 6 is the widening base, 7 is the shield machine,
9 is the planned widening area, 11 is the shield frame, 1
Reference numeral 6 indicates a widened segment, and 20 and 21 indicate sealing members.

Claims (1)

[Scope of utility model registration request] A widening base formed in an annular shape on the outer periphery of the tunnel where primary shielding has been performed and a widening segment constructed on the outer periphery of the widening shield machine installed at the widening base or behind the widening shield machine are sealed watertightly. A sealing device for the widening shield construction method that stops the widening, characterized in that a ring-shaped sealing member is interposed between the widening base and the outer periphery of the widening shield machine or the constructed widening segment.