JPH0860979A - Method for joining tunnel - Google Patents

Abstract

PURPOSE: To make a tunnel junction method easily applicable even to an unhardened, water-bearing natural ground where water collects and to achieve a reduction in excavation cost and enhancement of working efficiency by constructing a vertical shaft at one end of a tunnel junction, propelling shield rails from the vertical shaft to the other end, performing excavation using shields from the opposite direction, and joining the shield rails together. CONSTITUTION: A vertical shaft 2 is constructed at a connection point at the right end of a tunnel junction. At the same time, shield rails S-1 , S-2 are propelled toward the vertical shaft 2 from right vertical shafts. Tunnels 3, 4 are constructed. Before the shield rails S-1 , S-2 reach the vertical shaft 2, a shield rail S-3 is unloaded from the vertical shaft 2 and propelled leftward. Thereafter, the shield rails S-1 , S-2 are removed from the vertical shaft 2. Next, the shield rail S-3 is propelled to a docking point 5. At the same time, the shield rails S-1 , S-2 are propelled toward the point 5 from left vertical shafts. After the shield rails have reached the point 5, the two face plates of the shield rails S-1 , S-3 are opposed and joined together, and the shield rails are made to pass through tunnels 6, 7. Therefore, the tunnels can be constructed with safety.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used for constructing, for example, a ramp branch merging portion of an underground road and a main line, a ramp tunnel, a subway station and a twin tunnel portion, a sewer pipe merging portion, etc. by a shield construction method. The present invention relates to a tunnel branch and merge method applied.

[0002]

2. Description of the Related Art In this type of tunnel branching / merging portion, a necessary space has been constructed mainly by an excavation method. For example, in the case of a subway station, a reinforced concrete structure is constructed by excavating a portion of the station by an excavation method, and a tunnel is constructed between the stations by a shield method. In addition, a so-called NATM method for holding the ground by using spraying and rock bolts may be applied.

Further, as an example of using the shield construction method, two shield machines are used to excavate a shield tunnel in parallel at the junction of the tunnel branches, and excavate and remove the residual soil between the shield tunnels to construct a necessary space. There is a way.
In addition, when constructing a subway station, etc., prepare a large-diameter shield machine for the station part, and when excavating to one end of the station part with a normal shield machine, excavate a large vertical shaft here, If you replace the shield machine with a large-diameter shield machine and proceed to the station part, and proceed to the other end, you will excavate a larger shaft again and replace the large-diameter shield machine with a normal shield machine and proceed. is there.

[0004]

However, the cutting method has a problem that it has a great influence on the surrounding environment and can be constructed only in a relatively shallow place. In addition, the NATM method has poor reliability in unconsolidated water-bearing grounds that have retained water,
Cannot be used.

Even with the parallel excavation method using two shield machines, the method can be adopted under stable ground conditions, and enormous ground improvement is required for unconsolidated water-bearing grounds that have stagnated water. Also, in the method of using a dedicated large-diameter shield machine, a large and expensive shield machine is required, and two large vertical shafts corresponding to the large-diameter shield machine are required.
Excavation costs are high, and a large-diameter shield machine and a normal shield machine are both raised and lowered in the vertical shaft, resulting in poor work efficiency.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to easily construct a tunnel branching and merging portion even in a water-bearing unconsolidated water-bearing ground. An object of the present invention is to provide a tunnel branching and joining method capable of reducing excavation cost and improving work efficiency.

[0007]

A method of constructing a tunnel branch merging portion according to the present invention is to construct a vertical shaft at one end of the tunnel branch merging portion, and then use the composite circular shield method from the vertical shaft to construct the other end of the tunnel branch merging portion. While digging towards the department,
The composite circular shield tunnel and / or the single circular shield tunnel is excavated from the opposite direction, and the composite circular shield tunnel at the junction and junction of the tunnel and the composite circular shield tunnel and / or the single circle shield tunnel excavated from the opposite side are excavated. It is to join.

[0008]

[Operation] A tunnel branch junction is constructed by the composite circular shield method starting from the vertical shaft, the shield tunnel from one side is connected to the tunnel branch junction at the vertical shaft, and the shield tunnel from the other end is the other end of the tunnel branch junction. Are joined by mechanical docking. The tunnel junction and the tunnels on both sides can be constructed by the shield method, and the tunnel junction can be easily constructed even for unconsolidated water-bearing ground.

Since only a vertical shaft is provided at one end of the tunnel junction, the usual shield construction method can be used,
The excavation cost can be reduced. Further, since the composite circular shield machine is inserted from the vertical shaft and joined at the other end of the tunnel branching and joining section by mechanical docking or the like, work efficiency can be improved.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to an illustrated embodiment. This is an example applied to branch and merge of three tunnels, as shown in FIG. 1. In the figure, by arranging the oblique partition wall 10 at the tunnel branch and merge part 1, two tunnels in each of two directions are formed. The case of branching into a book is shown.

As shown in FIG. 1, according to the present invention, the tunnel branching and joining section 1 and the tunnel portions continuous on both sides thereof are constructed only by one vertical shaft 2 and the shield construction method in the tunnel branching and joining section. The shield machine is a single circle shield machine S _-1.
And a double shield machine S _-2 and a triple shield machine S _-3 are used.

Double shield machine S _-2 and triple shield machine S _-3
Is a shield machine in which cutter face plates having the same diameter are displaced in the excavation direction and partially overlapped in the lateral direction and arranged, and mechanical docking in which the respective central axes are aligned and joined is possible. The single-circle shield machine S _-1 is a shield machine having a cutter face plate with a diameter smaller than that of the triple shield machine S _-3 , and it is possible to perform docking with different diameters with the center axis of the shield machine displaced (see Fig. 1 (c)). ).

In the above-mentioned structure,
Perform construction (see Figure 2).

(I) A vertical shaft 2 is excavated and constructed at the junction point at the right end of the tunnel junction unit 1. At the same time, the single-circle shield machine S _-1 and the double shield machine S _-2 are started toward the vertical shaft 2 from each shaft on the right side (not shown) to construct the single-circle shield tunnel 3 and the double shield tunnel 4. .

(II) Before the single circle shield machine S _-1 and the double shield machine S _-2 reach the vertical shaft 2, the triple shield machine S _-1.
-3 is dropped into the shaft 2 and started to the left. After that, the single-circle shield machines S- ₁ and 2 digging from the right side
Reach the vertical shaft 2 of the continuous shield machine S _-2 and collect it on the ground.

(III) The triple shield machine S _-3 is dug up to the docking point 5 at the left end of the tunnel junction 1, and at the same time, the single-circle shield machines S _-1 and 2 are sewn from the respective left shafts (not shown). Start the continuous shield machine S _-2 toward the docking point 5.

(IV) The two face plates of the triple shield machine S _-3 and the double shield machine S _-2 are opposed to each other and joined by mechanical docking. The internal equipment of each shield machine is disassembled and taken out, and the skin plate is buried in the tunnel as it is, and the triple shield tunnel 6 and the double shield tunnel 7 are penetrated. If necessary, the skin plate is lined.

Triple shield machine S _-3 and single circle shield machine S _-1
1 side plates face each other as shown in FIG. 1 (c),
Docking is performed by different-diameter docking, the internal equipment of each shield machine is disassembled and taken out in the same manner as described above, the skin plate is directly embedded in the tunnel, and the triple shield tunnel 6 and the single-circle shield tunnel 8 are penetrated. After that, a tunnel structure is completed by constructing partition walls and the like (see FIG. 1B).

Although the case where three tunnels are branched and merged has been described above, the present invention can be applied to the branch and merge of one tunnel and two tunnels, and the branch and merge of four or more tunnels.

[0020]

As described above, since the tunnel branching and joining method according to the present invention has the above-mentioned structure, it has the following effects.

(1) Since the shield construction method can be used at the tunnel junction, the tunnel junction can be constructed easily and safely even with unconsolidated water-bearing ground.

(2) Since it is sufficient to provide only one vertical shaft at the junction of the tunnel branches, a relatively inexpensive shield machine can be employed, so that excavation cost can be reduced.

(3) Since the shield machine for the tunnel branch and merge part is inserted from the vertical shaft at one end and the shield machines are docked at the other end, the work efficiency can be improved.

[Brief description of drawings]

1A is a schematic plan view showing a method of constructing a tunnel branching / merging portion according to the present invention, FIG. 1B is a schematic plan view showing a constructed tunnel, and FIG. 1C is a docking portion. It is a schematic sectional drawing.

FIG. 2 is a schematic plan view sequentially showing a method for constructing a tunnel branching / merging portion according to the present invention.

[Explanation of symbols]

S _-1 … Single circle shield machine S _-2 … Double shield machine S _-3 … Triple shield machine 1… Tunnel junction / merging section 2… Vertical shaft 3… Single circle shield tunnel 4… Double shield tunnel 5… Docking point 6 … Triple shield tunnel 7… Double shield tunnel 8… Single circle shield tunnel

Claims (1)

[Claims] 1. A vertical shaft is constructed at one end of a junction of the tunnel branch, and the vertical shaft is dug from the vertical shaft toward the other end of the junction of the tunnel branch, and a composite circular shield method is applied from the opposite direction. And / or a tunnel branch characterized by joining the composite circle shield tunnel at the junction with the composite circle shield tunnel and / or the single circle shield tunnel that has been dug from the opposite side How to join.