JPH07173848A - Underground space construction method - Google Patents

Abstract

PURPOSE:To secure an underground space with safety and efficiency by building at least four tunnels underground and installing an earth retaining material in the horizontal and vertical directions from inside the tunnels so that the tunnels may be closed. CONSTITUTION:Four tunnels 1 are built up based on a longitudinal ridge of an excavation scheduled rectangular parallelepiped as its central axis. Earth retaining materials 2a and 2b in the horizontal and vertical directions are installed from inside the tunnels in such a fashion that they may close the region between the tunnels 1. Using a steel pipe circular-shaped in cross section, earth retaining materials 2a and 2b which adjoin each of the earth retaining materials 2 and 2b and provided with a cut-off blade are used in the case when an underground water level is high. Then, the internal parts of the space closed by the earth retaining materials 2a and 2b are excavated so as to obtain a space whose size is specified. This construction makes it possible to prevent the ground collapse even when an initial scheduled site is excavated and omit the ground excavation from the ground to the ceiling site which is scheduled for excavation and secure the underground space with safety and efficiency.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing an underground space, and is particularly suitable for constructing an underground structure such as a diameter expansion part of an underground platform or an underground station whose sectional area in the axial direction of the tunnel changes, or underground. The present invention relates to an underground space construction method suitable for obtaining a large-section space.

[0002]

2. Description of the Related Art Conventionally, an excavation method has been generally adopted and practiced for constructing a complex structure of this kind underground. In addition, in place of the open-cut method, a modified cross-section shield method has also been proposed.

[0003]

However, the above-mentioned excavation method can change the cross section of the underground space, and it is also possible to obtain a large cross-section underground space, but since it is construction from the ground, If an underground structure is planned to be under the road, occupying a part of the road causes a problem such as causing traffic congestion.

Further, when underground wiring such as electric wiring, gas pipes, water and sewer pipes, telephone lines and the like are complicated under the road, it is necessary to turn around or protect the underground underground, which is economical. There was a problem that there was a lot of waste both in terms of time and construction period.

Further, recently, the depth of construction of these underground structures tends to be deeper and deeper, and as the depth becomes deeper, the excavation method becomes large-scale and difficult construction, the construction cost is high, and the construction period becomes long. have.

Further, the conventional irregular cross-section shield construction method is not a single circular cross section such as a double circle or an ellipse at this stage even though it is called an irregular shape, and a method of reducing the tunnel diameter in the middle is proposed. However, there is a problem that it cannot be realized until the cross-sectional area of the underground space is appropriately changed on the way. In addition, although the size of the cross-section of the modified cross-section shield method is not particularly limited, due to factors such as the manufacturing cost of the shield machine, the earth pressure for stabilizing the face, the difficulty of setting the mud pressure, etc. Those with a diameter of a few dozen meters or less have no construction record. Therefore, in order to change the cross-sectional area and obtain a large cross-section underground space by this type of variant cross-section shield method, a diameter expansion post-construction method is required. As a general rule, an auxiliary construction method such as this is required, and this post-diameter expansion construction method has a problem that it involves danger and an increase in construction cost.

Therefore, the present invention has been made in view of the above problems, and it is an object of the present invention to provide a method for constructing an underground space in which a space for constructing a structure having a complicated shape in advance can be secured safely and efficiently. It is intended.

[0008]

In order to solve the above-mentioned problems, the structure of the present invention, which is based on the above-mentioned claims and has the above-mentioned object, has at least four or more tunnels 1 built underground, Mountain retaining materials 2a, 2 laterally from inside the tunnel 1
a, 2a ... and vertical mountain retaining materials 2b, 2b, 2b.
.. are installed so as to close the tunnels 1, 1, 1 ... And the technical means for excavating the inside closed by the group of mountain retaining materials 2a, 2b is taken.

Further, in the invention of "claim 2", at least two or more tunnels 1 are constructed underground, and the mountain retaining materials 2a, 2a, 2a ... , 1 are installed so that they are closed, and further, the mountain retaining materials 2b, 2b, 2b, etc. in the vertical direction from inside both tunnels are installed to the required rooting depth, and the mountain retaining materials are installed in a gate shape. Two
The technical means for excavating the inside of the a and 2b groups was taken.

[0010]

Next, the operation of the present invention will be described. According to the method of the present invention, since the group of mountain retaining materials 2a and 2b are installed in advance on the upper and side portions of the planned excavation site, even if the planned excavation site is excavated, the ground collapse can be prevented.

Further, since the method of the present invention installs the group of mountain retaining materials 2a, 2b from the tunnels 1, 1, 1 ... Excavated in advance, it does not affect the ground at all, and the excavation from the ground is planned. Exhibits the effect of omitting ground excavation to the ceiling part of the part.

Further, although the method of the present invention requires excavation of a space having a considerable margin for the structure to be built in the underground space, the excavation amount is so small that it cannot be compared with the open-cut method. Compared with the method of expanding the diameter of the underground space obtained by the Tesumi, modified section shield method, etc., the auxiliary method such as ground improvement can be omitted.

[0013]

Embodiments of the present invention will be described below with reference to the accompanying drawings. In the figure, 1, 1, 1 ... Are tunnels built underground.

The tunnel 1 is provided with a start / reach shaft or a start / reach opening (not shown), a shield construction method, an NA.
Any method can be used as long as it can build a tunnel such as the TM method and the mountain method, and the cross-sectional shape is circular as well as
It may be horseshoe-shaped, rectangular or other non-circular shape.

The tunnel 1 is constructed by at least four or more, and the mountain retaining material 2 extending in the lateral and vertical directions from the inside of the tunnel 1.
The groups a and 2b are installed so that the tunnels 1, 1, 1 ... Are closed. That is, "Fig. 1" is an example of excavating a rectangular parallelepiped space underground, and four tunnels 1 are constructed with a longitudinal axis of the rectangular parallelepiped to be excavated as a central axis. It is needless to say that the tunnels 1, 1, 1 ... Are not necessarily required to be constructed in parallel and may be provided in accordance with the size and shape of the planned excavation space.

The group of mountain retaining materials 2a and 2b installed from the inside of the tunnel 1 can be any conventionally known one, and usually,
A steel pipe with a circular or rectangular cross section is used,
When the groundwater level is high, it goes without saying that it is also possible to use a conventionally known one in which water retaining blades that overlap the mountain retaining materials 2a and 2b adjacent to each other in a proper range are attached to the respective mountain retaining materials 2a and 2b. In addition, the pipe may be filled with concrete or the like so as to withstand the external earth pressure.

Further, the mountain retaining materials 2a and 2b may be made of steel pipes and may be wall bodies formed by a cast-in-place construction method such as an underground continuous wall construction method or a muddy water solidification construction method. The underground continuous wall construction method and the muddy water solidification construction method are well known in the art, and therefore their explanations are omitted.

In the above description, the reason why the number of tunnels 1 is four or more is to enclose the group of mountain retaining materials 2a and 2b vertically and horizontally, and by providing four tunnels in a direction substantially parallel, It is possible to surround the left and right with the mountain retaining material 2. When the distance between a pair of adjacent tunnels is long, intermediate tunnels 1a, 1a may be provided between them as shown in FIG. When it is necessary to enclose it with a group of timber 2b (If the front side of the underground space to be excavated opens to the ground,
It goes without saying that the groups a and 2b are unnecessary in the opening direction. ) May construct a total of 8 or more tunnels, two at the top and two at the back, and install a group of mountain retaining materials 2b in the vertical direction. In this case, the tunnels 1, 1, 1 ... It is efficient to install a group of mountain retaining materials 2a in the lateral direction from the vertical shaft provided for excavating.

Then, the inside closed by the group of mountain retaining materials 2a and 2b (including some tunnels 1, 1, 1 ...) Is excavated to obtain a target space of a predetermined size underground.

The excavation in the group of mountain retaining materials 2a and 2b may be performed from the starting and reaching shafts or the starting and reaching entrances on both sides, but the excavation surrounded by the group of mountain retaining materials 2a and 2b in the middle of the tunnel 1. It is also possible to provide an unillustrated excavation opening that opens within the range and start excavation from this excavation opening.

Since it is necessary to support the intermediate tunnel 1a shown in FIG. 2 during the excavation, the intermediate pillars 3, 3, 3 ... Are installed in advance in this intermediate tunnel 1a.
The middle pillars 3, 3, 3 ... May be installed from inside the intermediate tunnel 1a in the same manner as the mountain retaining material 2, but the mountain retaining materials 2, 2,
2 ... are continuously provided to stop the water, but these may be provided with a space necessary for supporting the intermediate pillars 3, 3, 3 ... Upper intermediate tunnel 1a. is there.

When excavating, the mountain retaining materials 2a and 2b are used.
If the group alone cannot resist the lateral soil water pressure, the beams 4, 4, 4 ... May be provided during the excavation process.

The underground space obtained by the above is surrounded by groups of mountain retaining materials 2a and 2b on the upper, lower, left and right sides (in front of the rear if necessary).
a, 2a ... are those that destroy or remove a part or all of the structure when constructing a structure in this underground space, or are usually unnecessary after the construction of an underground structure. In some cases, it may be efficient to omit the mountain retaining materials 2a, 2a, 2a ... On the lower surface. In the construction method of claim 2, at least two tunnels 1 are constructed underground and the tunnel 1 Mountain retaining materials 2a, 2a, 2a ...
Are installed so that the tunnels 1 and 1 are closed, and the mountain retaining members 2b and 2 extending in the vertical direction from the inside of both tunnels 1 and 1
b, 2b ... Are respectively installed up to the required depth of rooting, and the group of mountain retaining materials 2a, 2b installed in a gate shape are excavated.

That is, the vertical mountain retaining members 2b, 2b, 2
By not excavating the underground space to the lower end of b ..., but keeping the floor surface F of the underground space at a depth halfway along the vertical mountain retaining materials 2b, 2b, 2b ... Mountain retaining material 2b,
The lower part of 2b, 2b ... Can be made to resist the earth pressure applied to the floor space F of the underground space from the surroundings.

In addition, the vertical mountain retaining members 2b, 2b, 2
In the method of installing b ... to the required rooting depth, the tunnel 1 is not required below the floor surface F of the underground space to be excavated, so that the number of tunnels 1 may be two or more. However, when the mountain retaining materials 2, 2, 2 ... Are also installed in the front direction of “FIG. 3” and “FIG. 4” by this method, the shaft used in the description of “claim 1” cannot be used. Therefore, it is necessary to build a tunnel 1 in the lateral direction also in the front direction, and a total of 4 tunnels 1 communicate with a flat square or trapezoid (the tunnels in the crossing direction may be vertically displaced).
It is necessary to do so.

The desired structure is constructed in the underground space obtained as described above, and the outer space portion of this underground structure is backfilled as necessary.

[0027]

EFFECTS OF THE INVENTION Since the present invention is as described above, a planned underground space to be excavated is surrounded by a group of mountain retaining materials 2a and 2b in advance. Can be provided.

Further, since the above-mentioned excavation is underground, the excavation capacity can be efficiently reduced, and a method for constructing an underground space that is not affected by the above-ground and buried objects near the above-ground can be provided. It is a thing.

Further, according to the present invention, even in the case of constructing a complicated structure underground, if an underground space of a size capable of accommodating the underground structure is secured, this underground structure can be constructed later. However, the amount of excess excavation for that is small compared to the conventional excavation method, and the ground collapse is more likely to occur than the conventional post-expansion method.
Since it can be prevented by the group b and the ground improvement method is not required, it is possible to provide an economical and efficient underground space construction method for constructing a structure with a varying sectional shape underground.

[Brief description of drawings]

FIG. 1 is a conceptual perspective view illustrating an underground space construction method of the present invention.

FIG. 2 is a conceptual perspective view of another embodiment.

FIG. 3 is a conceptual perspective view of another embodiment.

FIG. 4 is a conceptual perspective view of another embodiment.

[Explanation of symbols]

 1 tunnel 2 Yamadome wood

Claims (2)

[Claims] 1. At least four or more tunnels 1 are constructed underground, and mountain retaining members 2a, 2a, 2a, 2a
2a ... and vertical mountain retaining materials 2b, 2b, 2b ...
Is installed so as to close the tunnels 1, 1, 1 ... And the underground space construction method for excavating the inside closed by the group of mountain retaining materials 2a, 2b. 2. At least two tunnels 1 are constructed underground, and the mountain retaining members 2a, 2a, 2a, 2a, 2a, 2a,
2a ... are installed so that the tunnels 1 and 1 are closed, and the mountain retaining members 2b and 2 extending in the vertical direction from the inside of both tunnels.
b, 2b ... are installed up to the required depth of rooting, respectively, and an underground space construction method for excavating the group of mountain retaining materials 2a, 2b installed in a gate shape.