JPH0434678B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to the structure of parallel shield tunnels used in railway tunnels, road tunnels, etc.

[Conventional technology]

Conventionally, when constructing subways etc. using the shield method, if a double-track section or an underground station part were made into one tunnel, the cross section would be large and there would be a lot of wasted space, so two parallel shield tunnels were connected by cutting and widening them. What has been done is known. A reinforced concrete slab or arch structure lining will be constructed between the parallel shield tunnels, and columns and bulkheads will be installed to connect the top and bottom.

In addition, three shield tunnels were constructed so that the approximately circular cross sections of each tunnel overlapped,
The central shield tunnel segment can be used as a temporary roof material to construct a lining for the ceiling, or a large segment with a special shape that can withstand the stress of the connection part can be built into the overlap position, and columns or bulkheads can be used to connect the upper and lower segments. It is also known that it was supported by

[Problem that the invention seeks to solve]

However, if the shield tunnels are cut and widened, it will become structurally unstable during excavation, etc.
Temporary construction work, etc. will increase, and work such as pouring concrete on site will also require a lot of effort and time. Additionally, construction using the shield method is discontinuous, resulting in process losses.

In addition, in order to disperse stress, normal shield tunnels are designed so that the joints of the segments are staggered in the tunnel direction, but when constructing overlapping shield tunnels, it is difficult to design the segments, and there are many types of Using segments makes construction complicated.

This invention aims to solve the problems in the prior art as described above.

[Means for solving problems]

The shield tunnel of the present invention is constructed by arranging shield tunnels with approximately circular cross sections in parallel so as to overlap, and connecting segments with approximately V-shaped cross sections with wing pieces protruding on either the left or right side are used above and below the overlapping portion. This is intended to provide continuity.

The joining segments are joined so that the wing pieces alternately protrude in opposite directions in the tunnel direction, and a pillar or partition is provided between the upper and lower joining segments.

For areas other than the overlapping portions, ordinary arc-shaped segments continuous with the above-mentioned joining segments are joined in the circumferential direction and in the tunnel direction. These joining segments and arcuate segments can be joined by bolts or the like at the rear erector part of the shield tunneling machine. Since the wing pieces of the joint segments are alternately projected in opposite directions, the joint positions of the arcuate segments are also shifted in the tunnel direction, thereby making it possible to disperse stress.

Note that these segments may be steel segments in addition to concrete segments (including reinforced concrete segments).

〔Example〕

Next, the illustrated embodiment will be described.

FIG. 1 shows a cross section perpendicular to the tunnel in one embodiment of the present invention, and FIGS. 2 and 3 show the structure of a combination of segments in a segment ring. The tunnel cross section has a dragonfly-like shape with overlapping approximately circular cross sections, and is formed by sequentially joining segments at the rear of the shield tunneling machine.

The segment is composed of an arcuate segment 11 that divides an arcuate portion, and upper and lower joining segments 1 of the overlapping portion, and a pillar or partition 15 is provided between the upper and lower joining segments 1.

The joining segment 1 has a substantially V-shaped cross section, and as shown in FIGS. 4 to 6, a wing piece 3 forming a part of an arc protrudes from the base 2 to one side, and as shown in FIG. The pieces 3 are joined so that they alternately protrude in opposite directions. In the figure, reference numeral 4 indicates a tunnel joint fitting, and numeral 5 indicates a circumferential joint fitting, in which a steel plate with a bolt insertion hole is embedded in the concrete surface, and bolt connection can be performed using a notch on the back side. Further, the base portion 2 and the wing piece 3 are provided with an erector attachment hole 6 and a backfilling material injection hole 7, respectively. Further, in the figure, 8 is a seal groove, 9 is a bolt hole for connecting a column or partition wall 15, and 10 is a concrete injection hole for embedding and fixing.

In this embodiment, each arcuate segment 11 has the same size, and the shape itself is as shown in FIGS. 7 to 9.
It is the same as that used as a conventional concrete segment as shown in the figure. 12 in the diagram
13 is a tunnel direction joint fitting, 13 is a circumferential direction joint fitting, and 14 is an erector mounting hole and a backfilling material injection hole. Corresponding to the wing pieces 3 of the joining segment 1 protruding alternately in the tunnel direction, they are joined in a staggered manner in the tunnel direction, thereby dispersing stress.

[Effect of the invention] As the shield machine excavates, a continuous segment ring is formed in the parallel shield tunnels via the joint segments of the overlap part, and columns or partition walls are provided between the upper and lower joint segments, so that tunnel formation is prevented. Requires less temporary materials.

The shield construction method can be applied as is, and there is no need to interrupt the construction of the shield machine, so there is no loss in the process.

The joining segment has wings that protrude in one direction, and the joint position of the segment is shifted in the tunnel direction, so that stress can be distributed.

Joint segments are not larger than necessary;
It can be assembled directly at the rear of the shield machine and is easy to install.

[Brief explanation of drawings]

Fig. 1 is a sectional view perpendicular to the tunnel showing an embodiment of the shield tunnel of the present invention, Fig. 2 is a side view of one segment ring, Fig. 3 is a plan view of three segment rings, and Fig. The figures are a front view showing the shape of the joint segment, Fig. 5 is a bottom view, Fig. 6 is a right side end view, Fig. 7 is a front view showing the shape of the arc-shaped segment, Fig. 8 is a bottom view, and Fig. 9 is a front view showing the shape of the joint segment. is a right side view. DESCRIPTION OF SYMBOLS 1... Joint segment, 2... Base, 3... Wing piece, 4... Tunnel direction joint fitting, 5... Circumferential direction joint fitting, 6... Erector mounting hole, 7... Backfilling material injection hole, 8...Sealing material, 9...Bolt hole, 10...Concrete injection hole, 11...Circular segment, 12...Tunnel direction joint fitting,
13...Circumferential joint fitting, 14...Erector mounting/injection hole, 15...Column or partition wall.

Claims (1)

[Claims] 1 Shield tunnels are arranged in parallel so as to overlap, and above and below the overlapping part, a joint segment having a substantially V-shaped cross section with wing pieces protruding on one side is installed in the tunnel so that the wing pieces alternately protrude in the opposite direction. A shield tunnel characterized in that the upper and lower joint segments are joined in the same direction, and a column or a partition is provided between the upper and lower joined segments.