JPH0428044B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an open shield construction method among construction methods for underground structures.

[Conventional technology]

The open shield construction method takes advantage of the respective strengths of the open-cut construction method and the shield construction method for construction of underground structures that form water, sewage, telegraph, telephone, and other underground passages, making it safe and easy even in urban areas and on soft ground. It was designed so that construction work could be carried out.

First, a general example of this open shield construction method will be explained for each step. First, as shown in Fig. 4, a U-shaped shield machine 1 with an open top and a propulsion jack 2 is installed in a launch shaft 3, and then launched. The earth retention 4 in front of the shaft 3 is cut, and the reaction wall 5 formed in the starting shaft 3 is used as a reaction force to extend the propulsion jack 2 and make it dig into the ground. During the excavation, the earth and sand will be discharged using a shovel such as a excavator 7, an auger, etc.

Next, a concrete box 6 and the like are suspended from the ground on the tail portion of the U-shaped shield machine 1, and the U-shaped shield machine 1 is further dug by using the concrete box 6 as a reaction force.

After a plurality of concrete boxes 6 are arranged in tandem in this manner, backfilling soil 8 is applied to the upper surface thereof, and the surroundings of the boxes 6 are grouted using a grout pump 9.

This process is repeated, and if necessary, the road surface is paved with tire rollers 10, etc. as temporary road restoration work, and when the U-shaped shield machine 1 reaches the reach hole 15, it is removed and the work is completed. .

By the way, in order to simultaneously construct a plurality of underground structures such as a concrete box 6 and a humid pipe 12 as shown in FIGS. 8 and 9, it is necessary to use a U-shaped shield machine 1 with a correspondingly large rectangular cross section. Construction is underway.

[Problem that the invention seeks to solve]

Figure 8 shows the case where the hume pipe 12 is installed on one side of the concrete box 6, and Figure 9 shows the case where the hume pipe 12 is installed on both sides of the box 6, but in both cases a large U-shaped shield is used. Since Machine 1 is used, the amount of excess excavation becomes large, increasing the construction period and construction cost. The amount of backfilling soil also increases, further increasing the construction period and cost.

Furthermore, as mentioned above, the U-type shield machine 1 excavates using the concrete box 6 as a reaction force, and the cross section of this concrete box 6 is similar to that of the shield machine 1.
Since it is smaller than the above, the arrangement of the propulsion jacks will be unbalanced vertically and horizontally. As a result, the direction of excavation is likely to be deviated.

The purpose of the present invention is to eliminate the disadvantages of the conventional example,
Even when constructing multiple underground structures at the same time, by excavating only the necessary areas as much as possible, it is possible to prevent an increase in the amount of excess digging and backfilling when excavating with a shield machine, and reduce the construction period and cost. Another object of the present invention is to provide a method of constructing an underground structure with good directionality during excavation.

[Means for solving problems]

In order to achieve the above object, the present invention provides an open shield construction method in which a U-shaped shield machine with an open top and a propulsion jack is used as a reaction force to excavate concrete boxes sequentially arranged behind the shield machine. The gist of this method is to partially bulge out the side wall or bottom plate of the U-shaped shield machine, and simultaneously construct a side groove for arranging a small underground structure at the bulged portion.

[Effect]

According to the present invention, when simultaneously constructing a large concrete box and a small underground structure such as a humid pipe,
Since the small underground structure is disposed using the bulge on the side wall or bottom plate of the U-shaped shield machine, the entire shield machine does not need to be so large. Therefore, the amount of over-excavation and backfilling does not increase significantly, the concrete box and shield machine do not differ in size more than necessary, and the vertical and horizontal balance of the propulsion jack installed between them does not collapse. .

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

Figure 1 is a front view showing one embodiment of the underground structure construction method of the present invention, and 1 in the figure is for the open shield construction method, with an open top surface and a propulsion jack (not shown) inside or at the rear end. ) U-type shield machine 1
shows.

The U-shaped shield machine 1 used in the construction method of the present invention partially bulges out one side wall 1a,
A bulge 13 that is continuous in the length direction was formed.

As another embodiment, the bulging portion 13 may be formed on both side walls 1a, 1a of the shield machine 1 as shown in FIG. 2, and as another embodiment, as shown in FIG. 1b.

Next, the construction method of the present invention using such a U-shaped shield machine 1 will be explained.

For the entire open shield construction method, see Section 4 above.
This is as explained in Figures to Figure 7, and the concrete box 6 is sequentially arranged behind the U-type shield machine 1, and the shield machine 1 is moved forward using this as a reaction force, so detailed explanation will be omitted. do.

The U-shaped shield machine 1 excavates the bulge 13.
This is also done, and the side grooves 14 are also continuously formed in this bulged portion 13.

Therefore, it is sufficient to arrange the concrete fume pipe 12, steel pipe, etc. in the side groove 14 and connect them one after another.

In this way, the concrete box 6 and the humid pipe 12 can be installed at the same time.

〔Effect of the invention〕

As described above, the construction of the underground structure of the present invention is an open structure in which the concrete box is opened at the top and a U-shaped shield machine equipped with a propulsion jack is sequentially arranged behind the shield machine. In the shield construction method, when constructing concrete boxes and small underground structures such as humid pipes at the same time, a shield machine that is uniformly large throughout is not used.
There is less need for over-digging, and the amount of backfilling soil is also smaller. As a result, the construction period was drastically shortened,
Moreover, cost reduction can be realized.

Furthermore, since the difference in size between the shield machine and the concrete box is not that large, the placement of the propulsion jacks between them will not be unbalanced vertically or horizontally, and the propulsion jacks will be able to use the concrete box as a reaction force. There is less risk of the shield machine going out of direction when extruding it while being stretched, making it highly reliable.

[Brief explanation of drawings]

FIG. 1 is a front view showing a first embodiment of the method for constructing an underground structure of the present invention, FIG. 2 is a front view showing a second embodiment of the same, and FIG. 3 is a front view showing a third embodiment of the same. 4 to 7 are explanatory views showing each step of a general example of the open shield construction method, and FIGS. 8 and 9 are front views showing conventional examples, respectively. 1...U-type shield machine, 1a...side wall, 1b...
...Bottom plate, 2...Propulsion jack, 3...Starting shaft, 4
... Earth retention, 5 ... Reaction wall, 6 ... Concrete box, 7 ... Backfill, 8 ... Backfill soil, 9 ...
Grout pump, 10... Tire roller, 11
...Road surface pavement, 12...Huyum pipe, 13...Bulging part, 14...Side ditch, 15...Reaching shaft.

Claims (1)

[Claims] 1. In the open shield construction method in which a U-shaped shield machine with an open top and a propulsion jack is used as a reaction force to excavate concrete boxes sequentially arranged behind the shield machine, the side wall or bottom plate of the U-shaped shield machine A method for constructing an underground structure, characterized by partially bulging out the bulge, and simultaneously constructing a side ditch for arranging a small underground structure in the bulge.