JPH0581719B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention is applicable to urban areas for water supply and sewerage, public sewerage, telegraph,
This invention relates to an open shield machine used in the open shield construction method for constructing underground structures such as underground passages for laying telephones, etc.

[Conventional technology]

The open shield construction method is a highly rational construction method that takes advantage of the advantages of the cut-and-cover construction method (open construction method) and the shield construction method.

To explain the open shield construction method shown in Figures 3 and 4, 1 in the figure is an open shield machine;
This is a U-shaped shield machine consisting of left and right side wall plates 1a, 1b and a bottom plate 1c connecting them, with openings at the front and rear end surfaces and at the top.

The open shield machine 1 has propulsion jacks 2 arranged vertically and facing rearward. 3 in the figure indicates a partition wall provided within the shield machine 1.

This shield machine 1 is installed in the starting hole with left and right side wall plates 1.
A and 1b are installed so as to be exposed above the ground, and earth and sand in front of the starting shaft is excavated and discharged from the front or top opening of the shield machine 1. Then, the propulsion jack 2 of the shield machine 1 is extended to apply a reaction force to the reaction wall in the launch shaft to advance the shield machine 1, and the first underground structure made of the concrete box 4 is suspended from above. Then, it is set behind the propulsion jack 2 which is retracted within the tail portion 1d of the shield machine 1.

Next, earth and sand are similarly excavated from the front or top surface of the shielding machine 1 using an excavating means 6 such as a shovel, an auger, or a bucket, and the earth is discharged, and the shielding machine 1 is moved forward. The second concrete box 4 is then lowered. below,
The same process of digging and setting the concrete boxes 4 is repeated to sequentially bury the concrete boxes 4 underground in columns to form an underground structure, and then apply grout material 7 to the side of the underground structure at the rear. Filling is performed, and backfilling 5 is applied to the upper part, and when the open shield machine 1 reaches the reaching hole, it is removed and the construction is completed.

[Problem to be solved by the invention]

In recent years, the open shield construction method using the open shield machine 1 as described above has also been implemented for construction of large sections with a depth of about 8 m.

As the depth becomes larger in this way, a large open shield machine 1 with higher left and right side wall plates 1a and 1b will be used.

By the way, when excavating the earth and sand in front of the front or top opening of the shield machine 1 as described above with the excavating means 6 such as a shovel, auger, or bucket, it is important to keep the face of the earth and sand at the angle of repose α to prevent collapse. It is necessary from the point, but if the depth is large, this angle of repose α
It becomes difficult to maintain

The purpose of the present invention is to eliminate the disadvantages of the conventional example,
To provide an open shield machine capable of easily securing an angle of repose and safely excavating even when excavating a large cross section at a large depth.

[Means to solve the problem]

In order to achieve the above object, the present invention provides an open shield aircraft having left and right side wall plates whose upper ends are exposed above the ground, whose front, rear and top surfaces are open, and a propulsion jack provided inside. There are multiple shield machines of different sizes, and the small shield machine is placed in front of the large shield machine, the propulsion jack of the small shield machine can be connected to the large shield machine, and the space between the left and right side walls of the small shield machine is large. The gist is to make the distance between the left and right side wall plates of the shield machine slightly larger than that of the shield machine, and to position the rear ends of the left and right side wall plates of the small shield machine outside the front ends of the left and right side wall plates of the large shield machine.

[Effect]

According to the present invention as set forth in claim 1, in order to move the shield machine forward, earth and sand are first excavated and discharged from the front or upper surface of the small shield machine using excavating means such as a shovel, auger, or bucket. Then, this small shield machine is propelled forward by its propulsion jack, using the large shield machine and the continuous concrete box as a reaction force. In this case, the depth of the earth and sand excavation is commensurate with the height of the left and right side wall plates of the small shield machine, and since it is not so deep, the angle of repose can be secured.

Next, the remaining depth is excavated from the front or top surface of the large shield machine, and the continuous concrete box is moved forward using a reaction force by the propulsion jack of the large shield machine. In this case, the excavation of the earth and sand is not so deep because the upper part that has already been excavated by a small shield machine is removed, and the angle of repose can be easily secured.

Once the large shield machine is advanced in this way, a new concrete box 4 is suspended in front of the existing concrete box within the tail section of the large shield machine, and the same excavation and concrete box construction are carried out. The setting process is repeated to sequentially bury the concrete boxes vertically in the ground to form an underground structure.

According to the invention as set forth in claim 2, the left and right side wall plates of the small shield machine that advances first are always located on the left and right side wall plates of the large shield machine, and both overlap at the front and rear ends, so that the large shield machine The resistance during excavation can be reduced, and the inflow of earth and sand from the sides can also be suppressed.

〔Example〕

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

Fig. 1 is a vertical sectional side view showing one embodiment of the open shield machine of the present invention, and Fig. 2 is a lateral cross-sectional plan view of the same. The symbols are attached.

The open shield machine of the present invention is composed of a plurality of large and small shield machines, a large shield machine 1 and a small shield machine 1', and the small shield machine 1' is disposed at the front of the large shield machine 1.

The basic configuration of the large shield machine 1 and the small shield machine 1' may be the same as the conventional one, and they consist of left and right side wall plates 1a, 1b, 1a', 1b' and bottom plates 1c, 1c' connecting them. It is a U-shaped shield machine with openings on the front, rear, and top surfaces.

Note that the bottom plates 1c and 1c' are not necessarily necessary, and they can be omitted and the side wall plates 1a and 1c may be replaced with beam members or the like.
b, 1a' and 1b' may be simply connected.

In addition, the open shield machines 1, 1' are arranged with the propulsion jacks 2, 2' facing rearward and arranged vertically,
Partition walls 3, 3' were provided inside.

Left and right side wall plates 1a', 1 of the small shield machine 1'
The height of b′ is large.The left and right side wall plates 1 of the shield machine 1 are large.
a, 1b, and these side wall plates 1a,
The upper ends of 1b, 1a', and 1b' are made to coincide with each other as being exposed above the ground.

In addition, the left and right side wall plates 1a' of the small shield machine 1',
1b' is set slightly larger than the distance between the left and right side wall plates 1a and 1b of the large shield machine 1,
The rear ends of the side wall plates 1a', 1b' are positioned so as to wrap around the outside of the front ends of the side wall plates 1a, 1b.

Further, a reaction force receiving member 8 is provided at the front part of the large shield machine 1, so that the tip of the propulsion jack 2' of the small shield machine 1' can come into contact with this reaction force receiving member 8.

Although not shown in the drawings, the propulsion jack 2' may be fixedly provided on the large shield machine 1 side, and its tip may be brought into contact with the small shield machine 1.

Next, the method of use will be explained. First, earth and sand are excavated from the front or upper surface of the small shield machine 1' using an excavating means (not shown), and the earth and sand are removed. In this excavation, the left and right side wall plates 1a' of the small shield machine 1',
The depth corresponds to the height of 1b', and since it is not so deep, the angle of repose α' can be secured.

Next, the propulsion jack 2' is extended to advance this small shield machine 1' by using the large shield machine 1 and the continuous concrete box 4 as a reaction force.

After that, excavate the remaining depth from the front or top surface of the large shield machine 1, and
The propulsion jack 2 generates a reaction force to move the continuous concrete box 4 forward. In this case, the earth and sand excavation is not so deep because the upper part excavated by the small shield machine 1' is already removed, and the angle of repose α
can be easily secured.

A new underground structure made of a concrete box 4 is suspended from above, and the tail part 1d of the shield machine 1 is
Set it behind the propulsion jack 2 that has been retracted inside.

Thereafter, the same steps of digging with the small shield machine 1' and the large shield machine 1 and setting the concrete boxes 4 are repeated, and the concrete boxes 4 are sequentially buried in the ground in columns to form an underground structure. The side of the underground structure at the rear is filled with grouting material 7, and the top is backfilled with 5, and the open shield machine 1,
1' reaches the reaching shaft, it is removed and the construction is completed.

〔Effect of the invention〕

As described above, the open shield aircraft of the present invention has left and right side wall plates whose upper ends are exposed above the ground, the front, rear, and top surfaces are open, and the propulsion jack is provided inside to face the rear. In this method, even when the excavation depth of a large cross section is large, the angle of repose can be easily secured during excavation and safe excavation can be performed.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional side view showing one embodiment of the open shield machine of the present invention, FIG. 2 is a cross-sectional plan view of the same,
FIG. 3 is a longitudinal cross-sectional side view showing a conventional example, and FIG. 4 is a cross-sectional plan view of the same. 1, 1'...Open shield machine, 1a, 1b,
1a', 1b'...Side wall plate, 1c, 1c'...Bottom plate, 1
d...Tail part, 2, 2'...Propulsion jack, 3,
3'...Partition wall, 4...Concrete box, 5...
... Backfill, 6... Excavation means, 7... Grout material,
8...Reaction force receiving material.

Claims (1)

[Scope of Claims] 1. In an open shield aircraft that has left and right side wall plates whose upper ends are exposed above the ground, the front, rear and top surfaces are open, and a propulsion jack is provided inside, the heights of the left and right side wall plates are different. This open shield machine is characterized by having multiple large and small shield machines, with a small shield machine placed at the front of the large shield machine, and the propulsion jack of the small shield machine being able to be connected to the large shield machine. 2. The distance between the left and right side walls of the small shield machine is slightly larger than that of the large shield machine, and the rear ends of the left and right side walls of the small shield machine are located outside the front ends of the left and right side walls of the large shield machine. Open shield machine described in item 1.