JPH0819825B2 - Construction method of underground space - Google Patents

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 body such as a road tunnel or a subway tunnel, and in particular, it is necessary to expand a tunnel cross section from a general portion like a subway station. The present invention relates to a construction method of an underground space body suitable for a case.

[0002]

2. Description of the Related Art Generally, an underground space body such as a road tunnel and a subway tunnel, which is constructed underground in an urban area, particularly a station portion requiring a large cross section, is constructed by an excavation method.

However, this open-cutting method not only has many construction steps, but also involves many nighttime operations, which leads to a longer construction period and an increase in construction costs. Particularly, the shortage of skilled workers in recent years makes it more difficult to carry out the construction. There is. Further, this excavation method has a problem in that the subsidence, noise, vibration, etc. are generated, so that the surrounding area is greatly affected.

Therefore, recently, a shield construction method has been used in place of such an excavation construction method. Among them, the construction of a station section requiring a particularly large cross section is shown in FIG.
A roof shield construction method and a kanzashi girder construction method as shown in Fig. 5 or a circular multiple shield construction method have been proposed.

In the roof shield construction method, a semicircular segment 30 is bridged between tunnels 20 which are excavated in parallel at appropriate intervals to form a roof, and in the kanzashi girder construction method, excavation is performed at appropriate intervals. The kanzashi girder 40 is bridged between the tunnels 20. Further, the circular multiple shield construction method connects a plurality of circular tunnels.

[0006]

However, since the roof shield construction method and the Kanzashi girder construction method are constructed by partially destroying the side surfaces of the tunnels excavated in parallel, the solidification construction method, the freezing construction method, etc. Has to be improved over a wide range, leading to an increase in construction cost and a longer construction period,
There was also the problem of low safety.

Further, the circular multiple shield construction method has a complicated segment shape, is heavy and is difficult to construct, and since it is premised on full-section excavation, it is great for discharging excavated earth and sand from a shield machine. Requires extensive ground equipment,
There was a problem that construction costs were high and it was difficult to secure a construction site. In particular, the investment efficiency is very poor in a portion where a widening of about 200 m to 300 m is required such as a station portion, and it is not possible to meet social needs.

The present invention has been made in view of the above problems, and an object thereof is to provide an underground space body such as a large-section road tunnel or subway tunnel with a short period and at low cost. It is to provide a construction method for an underground space body that can be easily constructed.

[0009]

[Means for Solving the Problems] To solve the above problems
The means of the present invention for
A construction method to build an underground space body in the ground between the shafts of
Using a shield machine with a rectangular cross section between the shafts
Cross section of external tunnels of rectangular cross section in parallel at appropriate intervals
It is constructed in a ring and the ground between these parallel external tunnels is
External tunnels adjacent to each other using the gap formed by excavation
Connect each other with a connecting tool and connect to the gap.
An external structure that is endlessly connected and integrated in a cross-sectional view is constructed by driving a reet, and the external structure is used .
This is the construction of an internal tunnel by excavating and lining the enclosed inner ground.

[0010]

According to the above construction, by constructing the external tunnels at appropriate intervals by using the rectangular shield excavator, it is possible to achieve an arbitrary cross-sectional shape at a low cost without increasing the scale of ground facilities. -Allows the construction of external structures with dimensions.

Further, by constructing an integral external structure by connecting the external tunnels to each other, it is possible to bear the load and stop the water, so that the inside of the external structure can be safely protected. It is possible to excavate in a dry state, and by lining the space after excavation, it becomes possible to use the internal tunnel as an underground space body.

Further, since the excavated soil remaining inside the external structure can be discharged through the external tunnels and the excavated soil can be effectively utilized for the internal construction of each external tunnel, workability and workability can be improved. Can be planned. Further, the underground space body can be easily enlarged or reduced by changing the construction interval of the outer tunnel or appropriately changing the shape of the lining segment.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a construction method for an underground space body of the present invention will be described in detail below with reference to the drawings. 2 is an explanatory view showing the excavation process, FIG. 3 is a plan view showing the excavation process, and FIG.
Is an enlarged sectional view of the outer tunnel, FIG. 4, FIG. 6, and FIG.
Reference numeral 0 is a cross-sectional view showing the construction method of the underground space body of the present invention.

The underground space A of the present invention is constructed by constructing rectangular outer tunnels 3a at appropriate intervals between the vertical shafts 1 and 2 excavated in the ground B at predetermined intervals, and then constructing the ground between these outer tunnels 3a. A structure in which a mountain is excavated and the external tunnels 3a are connected and integrated with each other to construct an endless external structure 3, and an internal tunnel 12 is excavated and lined inside the external structure 3. Is.

Next, a method for constructing the external structure 3 will be specifically described with reference to the drawings. FIG. 2 shows the arrangement of a total of 13 outer tunnels 3a, which are constructed using four rectangular shield excavators 4 having different cross-sectional shapes and dimensions.

The construction procedure is as follows.
The four points of 1, -1, -1, and -1 are shown in (1) of FIG.
As shown in, the outer tunnel 3a is lined by excavating from the vertical shaft 1 side toward the vertical shaft 2 side. Next, -2 in FIG.
As shown in (2) of FIG. 3, four locations -2, -2, and -2 are excavated from the vertical shaft 2 side toward the vertical shaft 1 side to line the outer tunnel 3a.

Next, -3, -3, -3 in FIG.
As shown in (3) of FIG. 3, while excavating from the vertical shaft 1 side to the vertical shaft 2 side to cover the outer tunnel 3a, the two positions of -4 and -4 in FIG. As shown in (3) of FIG. 3, by excavating from the vertical shaft 2 side toward the vertical shaft 1 side and lining the external tunnel 3a, the external tunnels 3a having a rectangular cross section are opened in the ground at appropriate intervals. Build (Figure 4).

Further, these external tunnels 3a are shown in FIG.
As shown in FIG. 4, a steel segment 5 is lined in the excavation hole 5a excavated by the rectangular shield machine 4, and the back of the shield machine 4 is inserted between the steel segment 5 and the excavation hole 5a. The backfilling material 6 such as gravel concrete is backfilled and injected to an appropriate thickness from the injection pipe 4a (FIG. 5).

The back-filling material 6 also serves to prevent corrosion of the steel segment, and a sufficient fluidizing agent is added to eliminate insufficient filling. The segment 5 is not limited to steel, but a concrete segment may be used, and its shape and dimensions may be arbitrary.

The shield machine 4 is shown in FIGS.
As shown in FIG. 4, four excavation cutters 7 are provided on the front surface of the rectangular body 13, and the excavation cutter 7 advances while excavating to construct a rectangular tunnel.

The excavating cutter 7 is a rotatable drum cutter 7a provided on both sides of a gear case 14 protruding from a partition wall 13a of the machine body 13, and is eccentric with respect to a rotary shaft 15 of the drum cutter 7a between the drum cutters 7a. The drum cutter 7a and the ring cutter 7b are connected to each other via a connecting gear 16 so that they rotate in the same direction.

The drum cutter 7a is connected to a motor 18 on the rear surface of the partition wall 13a via a bevel gear 17a and various other gears 17b, and is driven by the motor 18 to rotate to excavate the natural ground. It is discharged by the sludge discharge pipe 19 which faces the lower part of the cutter 7a.

It should be noted that in the present embodiment, four different shapes and sizes are used.
The case of using the shield excavator 4 of one base was explained, but this is not limited to four, and the underground space body A
The shape and size of the shield excavator 4 can be appropriately changed according to the shape and size, and the shield machine 4 having the same shape and size can of course be used.

Next, the external tunnel 3a is formed by the above method.
After the construction, the gaps 3b are formed by excavating between the outer tunnels 3a. However, if there is a fear of groundwater seepage, for example, a lime injection pipe is used to inject the chemical liquid between the outer tunnels 3a. Then, the ground for water stoppage is improved (Fig. 6).

This excavation is carried out manually by an opening for work formed by removing a part of the steel segment 5, and the excavated soil 8 is transferred from each outer tunnel 3a to a carrier vehicle 9.
And so on. Also, be careful not to concentrate the work in one place by leaving this excavation as a blank and performing it at several places in parallel.

Next, after the excavation between the outer tunnels 3a is completed, an insertion hole is provided at an appropriate position of the steel segment 5, and a connecting tool 10 such as a high tension bolt or a PC steel wire is inserted into the insertion hole. Then, it is bridged between the external tunnels 3a (FIG. 7).

In this case, the space 3 between the outer tunnels 3a
A steel material such as an H-shaped steel can be welded and connected at a portion where b is large. Further, for this joint portion, an appropriate member can be selected according to the required physical strength.

Next, the connecting tool 1 is provided between the outer tunnels 3a.
After laying 0, the gap 3b is filled with concrete M, and after the concrete M is hardened, the connecting tool 10 is tensioned to apply prestress to integrally and endlessly form each outer tunnel 3a. To construct the external structure 3 (FIG. 8).

Next, while the inner side of the outer structure 3 is open-excavated by the power shovel P from the vertical shaft 1 side to the vertical shaft 2 side, the inner formwork 11 is assembled on the inner surface, and the reinforcing bars are arranged in the inner formwork 11. The inner tunnel 12 is constructed by stiffening and placing concrete M (FIG. 9).

The remaining excavated soil 8 at this time is the outer tunnel 3a.
To the outside. Further, by filling the remaining excavated soil 8 inside the segment 5 of the outer tunnel 3a, an inspection passage and a ventilation hole can be constructed in the outer tunnel 3a (FIG. 10).

[0031]

INDUSTRIAL APPLICABILITY The present invention makes it possible to easily construct an underground space body such as a road tunnel or a subway tunnel having an arbitrary shape and size at low cost, and further, to form and size the underground space body. Since it is possible to construct an external tunnel by combining various shield excavators according to the above, it is possible to reduce the amount of soil discharged.

Since the inner ground of the outer structure can be excavated open and the excavated soil can be carried out through the outer tunnel, workability and workability can be improved.

After constructing the inner tunnel, the outer tunnel can be effectively used for inspection passages, ventilation holes, drain holes, and the like.

[0034]

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a construction method of an underground space body.

FIG. 2 is an explanatory diagram showing a construction order of external tunnels.

FIG. 3 is a plan view showing the order of constructing an external tunnel.

FIG. 4 is a cross-sectional view of the outer tunnel excavated at appropriate intervals.

FIG. 5 is an enlarged cross-sectional view of an external tunnel.

FIG. 6 is a cross-sectional view of the excavation between external tunnels.

FIG. 7 is a cross-sectional view in which a connecting tool is bridged between external tunnels.

FIG. 8 is a cross-sectional view in which concrete is filled between outer tunnels.

FIG. 9 is a cross-sectional view in which an inner tunnel is constructed inside the outer structure.

FIG. 10 is a cross-sectional view of an external structure.

FIG. 11 is a vertical sectional view of the shield machine.

FIG. 12 is a front view of the shield machine.

13 is a sectional view taken along line XX of FIG.

14 is a sectional view taken along line YY of FIG.

FIG. 15 is a cross-sectional view of a conventional underground space construction method.

[Explanation of symbols]

 A Underground space B Ground 1, 2 shafts 3 External structure 3a External tunnel 12 Internal tunnel

Claims (3)

[Claims] 1. A plurality of shafts constructed at appropriate intervals.
A method of constructing an underground space body in the ground between
Use a shield machine with a rectangular cross section to cut multiple rectangular sections
The outer tunnels of the surface are parallel to each other at appropriate intervals and have an annular cross section.
Build and excavate the ground between these parallel external tunnels
Using the gap formed by
Connect with a connecting tool and put concrete in the gap.
To construct an external structure that is endlessly connected and integrated in a cross-sectional view and is surrounded by the external structure.
A construction method of underground space body characterized by excavating and lining the inner ground to construct an internal tunnel. 2. The gap is provided between adjacent outer tunnels.
After injecting a chemical solution into the natural area of
The method for constructing an underground space body according to claim 1, wherein the ground material is excavated and formed . 3. The outer tunnel is excavated and formed using a plurality of shield excavators having different cross-sectional shapes and dimensions.
Building construction method of underground space of claim 1, wherein the that.