JPS6145035B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of expanding the cross-sectional shape of a tunnel lined with segments from inside the tunnel.

Typically, tunnels constructed using the shield method are used for sewerage systems, power and communication wiring pits, subways, and the like.

Such tunnels are formed by excavating earth and sand using the shield method and lining the excavated walls with concrete or steel segments. , or when a cross-sectional area wider than the tunnel cross-section is required, such as a place for wiring, connections, or sewage maintenance, the conventional shield construction method involves excavating a vertical shaft from the ground after excavating the tunnel. It is normal to construct a widened section.

However, in recent years, it has become extremely difficult to acquire land and construct the shafts as described above due to deteriorating road conditions, absolute land shortages, and growing local residents' interest in environmental conservation.

The present invention was developed in view of these problems, and provides a tunnel widening method that can construct a desired widening section from inside the tunnel without excavating a vertical shaft from the ground.

Embodiments of the present invention will be explained with reference to the drawings: 1
is a generally used concrete or steel segment, which lines a tunnel 3 formed by excavating the ground 2 with a shield machine. Reference numeral 4 denotes a segment member for forming a widening wall made of a steel plate, which is pre-assembled in place of the segment 1 in the part where the cross-sectional shape of the tunnel 3 is to be widened, and forms the tunnel 3 together with the segment 1. As seen in FIG. 3, the peripheral wall frame 4a is rectangular in shape and consists of upper and lower side plates 8, 8 and left and right side plates 10, 10, which are parallel to each other and have the same width.
A wall board 6 with an arcuate surface that matches the shape of excavation by the shield machine is provided on the surface on the ground 2 side, and the peripheral edge of this wall board 6 is integrally connected to the peripheral end surface of one end of the peripheral wall frame 4a. Furthermore, a flange plate 14 having an appropriate width is integrally provided around the other end of the peripheral wall frame 4a facing inward.

Reference numeral 5 denotes an earth and sand intake port provided in the wall plate 6 of this widening wall forming segment member 4. In the figure, there are rectangular openings 6a at two locations, upper and lower, and inward from the periphery of the openings 6a. A pyramid-shaped earth and sand introduction cylinder 6b is integrally provided on the opposite side, and a lid plate 12 is attached to the earth and sand outlet opening of the cylinder 6b so as to be openable and closable. are closed to prevent the inflow of earth and sand.

Reference numerals 7 and 9 denote a plurality of bolt holes drilled at predetermined intervals in the circumferential direction in the upper and lower, left and right side plates 8 and 10 of the peripheral wall frame 4a, respectively. The bolt holes 9 provided in the left and right side plates 10 connect the upper and lower side plates 8, 8 to the segments 1, 1 adjacent to each other in the tunnel circumferential direction, and the bolt holes 9 provided in the left and right side plates 10, 10 connect the side plates 10 to the segments 1, 1 adjacent to each other in the longitudinal direction of the tunnel. It is connected to the widening wall forming segment member 4.

Reference numeral 13 denotes bolt holes drilled at regular intervals in the flange plate 14 of the peripheral wall frame 4a.

15 is a rectangular short cylinder having the same shape as the peripheral wall frame 4a of the widening wall forming segment member 4;
As shown in FIG. 6, a flange plate 18 having the same shape as the flange plate 14 of the segment member 4 is integrally provided inwardly around both opening edges, and the segment member 4 is attached to the flange plate 18. A plurality of bolt holes 17 are drilled to engage the bolt holes 13 provided in the flange plate 14 of.

Reference numeral 19 denotes jacks, and a plurality of jacks are arranged perpendicularly to the tunnel on top and bottom, left and right, on a trolley 21 that moves on rails 20, 20 laid in the length direction of the tunnel in the tunnel 3. The cylinder 22 is fixed to a frame 23 erected on one side of the truck 21, and the end of the rod 24 is brought into contact with the flange plate 18 of the short cylinder 15.

Reference numeral 25 denotes a reaction force receiver that comes into contact with the inner circumferential surface of the segment 1 to receive the reaction force of the action of the jack 19, and an adjustment journal jack 26 is interposed between it and the frame 23.

Now, when assembling the segment 1 while excavating the tunnel with a shield machine (not shown), the part of the tunnel to be widened is lined with the segment member 4 for forming widening walls, and the vertically adjacent segments 1 and the widening wall forming segment member 4 are connected to each other through bolt holes by connecting bolts (not shown), and the segment 1 or segment member 4 adjacent in the longitudinal direction of the tunnel is connected by connecting bolts in the same manner. join each other.

After tunnel excavation by the shield machine is completed, the cart 21 is moved and stopped at the position of the segment member 4, and the journal jack 26 is adjusted to bring the reaction force receiver 25 into contact with the segment 1 facing the segment member 4. Next, the short cylindrical body 15 is arranged on the back side of the segment member 4, and the flange plate 1
After aligning the bolt holes 17 of 8 with the bolt holes 13 of the flange plate 14 of the segment member 4 and joining them with bolts, operate the jack 19 to bring the rod 24 into contact with the back side flange plate 18 of the short cylinder body 15. Let them come into contact with you.

Next, the connecting bolts between the peripheral wall frame 4a of the widening wall forming segment member 4 and other segments are removed, the lid 12 of the segment member 4 is opened to open the soil intake port 5, and the ground is excavated through the intake port 5. At the same time, the jack 19 is activated to press the segment member 4 integrated with the short cylinder 15, and propel it into the ground as excavation progresses.

In this case, if the soil on the ground is soft, the segment member 4 can be propelled while flowing into the tunnel from the soil intake port 5 only by the pressing force of the jack 19; if the soil is hard, the segment member 4 can be manually dug. Alternatively, excavate with an appropriate excavation machine.

In this way, the segment member 4 is propelled into the ground, and when the back surface of the short cylindrical body 15 connected to the segment member 4 reaches the inner peripheral surface of the segment 1, the propulsion is stopped, the lid 12 is closed, and the short cylindrical body 15 is closed. Segment 1 is appropriately fixed with bolts, etc., the rod 24 of the jack 19 is retracted, the next short cylinder 15 is connected to the back of the propelled short cylinder 15, the fixation with the segment 1 is released, and the jack 19 is tightened again. is activated to propel the short cylinder 15 together with the segment member 4 into the ground.

By repeating such operations, the segment member 4 and the short cylindrical body 15 form an expanded portion having a desired width.

Further, when the segment members 4 are attached continuously in the length direction of the tunnel, a long widened portion in the tunnel direction can be created by sequentially performing the above-mentioned width widening operation on the segment members 4.

Further, if the short cylinder body 15 is divided into two parts and assembled to form the short cylinder body, transportation and assembly will be facilitated.

Note that it is a matter of course that a waterproof packing is provided between the segment member 1 and the segment member 4 or the cylindrical body 15.

As described above, the present invention provides an expanded wall by providing a soil intake port having a size that allows manual or mechanical digging on a wall surface facing the ground side, and attaching an opening/closing lid to the soil intake port. The segment member for forming the widening wall is assembled into a part of the segment for lining the tunnel so that it can be press-fitted outward in the direction perpendicular to the length direction of the tunnel. By pressing and propelling the earth from the inside using jacks, etc., the earth and sand are allowed to flow into the tunnel through the earth and sand intake ports of the segment members for forming widening walls, and when the ground is hard, manual digging is carried out through the earth and sand intake ports. Or, because it relates to a tunnel widening method characterized by forming a widening part in a tunnel by driving a widening wall forming segment member into the ground while performing mechanical excavation,
A soil intake port with an opening large enough to allow manual or mechanical digging is provided on the wall surface of the segment member for forming widening walls facing the ground, and an opening/closing lid is attached to the soil intake port. Of course, by closing the earth and sand intake with a lid when assembling the tunnel, natural inflow of earth and sand into the tunnel can be prevented. Press the forming segment member into the ground,
When propelled, earth and sand can be actively flowed into the tunnel from the entrance, and the ground can propel the segment members for width expansion.
Since it does not loosen due to pressure, it is possible to reliably prevent the ground from sinking.Furthermore, if the ground is hard, smooth excavation depending on the geology can be performed by hand or mechanical digging through the earth and sand intake port. This allows the widened portion of the tunnel to be formed efficiently.

As described above, according to the tunnel widening method of the present invention, a desired widening section can be formed from inside the tunnel without the need to excavate a shaft from the ground, and therefore problems such as acquiring land for a shaft can be completely solved. Moreover, widened parts with large and small spatial areas can be easily obtained without being limited by the press-fit distance of segment members or the length in the tunnel direction, and can be used in branch tunnels and subway stations. It can also be used for construction such as.

Furthermore, according to the method of the present invention, after forming the widening section, a sealing machine can be installed on the widening section to use it as the starting mouth of a branch tunnel. It can be formed in either direction.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a cross-sectional view of a tunnel before forming a widening section, FIG. 2 is a cross-sectional view of a tunnel during formation of a widening section, and FIG. 3 is a segment for forming a widening wall. FIG. 4 is a rear view of the member, FIG. 4 is a central vertical sectional view thereof, FIG. 5 is a front view of the short cylinder, and FIG. 6 is a sectional view thereof. 1... Segment, 3... Tunnel, 4... Segment for forming widening wall, 5... Earth and sand intake, 15
...Short cylinder, 19...Jyatsuki.

Claims (1)

[Claims] 1. An earth and sand intake port with an opening large enough to allow manual or mechanical digging is provided on the wall facing the ground side, and an opening/closing lid is attached to the earth and sand intake port to cover the tunnel with segment members for forming widening walls. It is assembled into a part of the segment to be constructed so that it can be press-fitted outward in a direction perpendicular to the length direction of the tunnel.
By pressing and propelling this widening wall forming segment member against the ground from the inside of the tunnel with a jack or the like, earth and sand will flow into the tunnel from the earth and sand intake port of this widening wall forming segment member, and the ground will be A tunnel widening method characterized by forming a widening part in a tunnel by driving a segment member for forming a widening wall into the ground while performing manual or mechanical digging through an earth and sand intake port when the ground is hard.