JPH0641963A - Open shield construction method and open shield machine - Google Patents

Abstract

PURPOSE:To prevent inflow of back filling earth and sand to the inside of an open shield machine, when back filling is performed in a surplus drilled part in case of execution in a gravel bed or in a curved part, in an open shield construction method. CONSTITUTION:Rotary plates 9 which projectingly open on the sides of a shield machine 1 are provided along the vertical directions of the extreme end parts of the right and left side wall plates 1a, 1b of an open shield machine 1. As back filling 8 is performed outside the right and left side wall plates 1a, 1b of the open shield machine 1, the rotary plates 9 are projected on the sides of the shield machine 1 at advancing the shield machine 1 so as to put the side ends close to the wall of a drilled hole. Further, the back filling part and the front part of the open shield machine 1 are divided from each other by means of the rotary plates 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an open shield construction method for constructing underground structures such as water supply and sewerage systems, common ditches, telegraphs, telephones, and other underground passages, and an open shield machine used therefor.

[0002]

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

The outline is shown in FIGS. 4 to 7, in which 1 is an open shield machine, which is a left and right side wall plate 1a, 1b.
And a side plate 1a, 1b and a bottom plate 1c having the same length and connecting the side plates 1a and 1b. In the open shield machine 1, the tip ends of the side walls 1a and 1b and the bottom plate 1c are formed as blade openings 2,
Further, the propulsion jacks 3 are arranged side by side vertically in the vicinity of the center or the rear ends of the side wall plates 1a and 1b.

Reference numeral 7 in the figure denotes a pressing member provided at the rear end of the propulsion jack 3, which is a frame body made of box steel or shaped steel.

The propulsion jack 3 of the shield machine 1 is extended and a reaction force is applied to the reaction wall in the start pit 6 to advance the shield machine 1 to move the first concrete box 4 forming an underground structure. Suspended from above, the tail part 1d of the shield machine 1
It is set behind the propulsion jack 3 that has been contracted inside. Struts are arranged between the propulsion jack 3 and the reaction wall to adjust the distance as appropriate. Further, the start pit 6 is composed of a retaining wall such as a sheet pile. To start the open shield machine 1, a part of this retaining wall is cut into a mirror, but if necessary, a front portion of the start pit 6 may be injected with a chemical solution or the like. The ground may be improved on the ground.

Then, similarly, the earth and sand are excavated from the front surface or the upper surface of the shield machine 1 and the soil is discharged to advance the shield machine 1, and the second underground is placed in front of the first underground structure 4. The structure 4 is suspended in the tail portion 1d of the shield machine 1.
After that, the same excavation and setting process of the underground structure 4 is repeated to sequentially bury the underground structures 4 in the column, and back-fill them on the rear underground structure 4 as shown in FIG. Although not shown in the figure, if the open shield machine 1 reaches the reaching pit, it is removed and the construction is completed.

In this way, the underground structure 4 is sequentially left behind from the tail portion 1d of the shield machine 1 and buried in the ground as the open shield machine 1 is dug. The space between the underground structure 4 and the open shield machine 1 is filled with water glass-based grout material 20, and the underground structure 4 has a grout material on the outer periphery except for the upper surface.
It is left in the ground as wrapped in 20.

[0008]

With such an open shield machine 1, excavation is performed from the ground surface inside the blade mouth 2 and at the front portion, so the earth and sand at the front portion of the blade mouth loosens, and the ground is displaced. . When excavating the gravel layer, the earth and sand on the outer peripheral portion of the blade tip 2 is dug out, and the width of the excavation hole widens by that amount, and a gap is formed between the excavation hole wall and the side walls 1a and 1b of the open shield machine 1. Will occur.

A so-called backfilling 8 for replenishing earth and sand from the above-ground portion is performed in this gap. However, open shield machine 1
At the time of advancing, the backfill earth and sand is dragged, bypasses the blade opening 2 and flows into the inside of the open shield machine 1, and it is useless to backfill.

The phenomenon of the above-mentioned overburden occurs not only in the gravel layer but also in the case where the open shield machine 1 is bent and advanced in the curve construction. By the way, for curve construction, shield machine 1
The strokes of the propulsion jacks 3 arranged on the left and right inside are different, and the shield machine 1 is bent and moved forward.

The object of the present invention is to eliminate the disadvantages of the conventional example and to prevent the backfill earth and sand from flowing into the inside of the open shield machine 1 when backfilling the overditch. To provide a shield method and an open shield machine.

[0012]

In order to achieve the above-mentioned object, the present invention has a propulsion jack provided inside the left and right side wall plates,
A step of excavating and discharging earth and sand in front of the front or upper surface opening of the open shield machine having the front, rear surface and upper surface opened,
The process of extending the propulsion jack and making the concrete box a reaction force to advance the shield machine, and the step of suspending and setting a new concrete box from above behind the propulsion jack contracted in the tail part of the shield machine. In the open shield construction method in which the concrete boxes are sequentially buried in a vertical line by repeating the above and The tip part is axially attached in the vertical direction, and this rotating plate is a part of a V-shaped plate having a bending extension plate, and the bending extension plate enters the inside of the shield machine from the axis attachment part,
It is connected to a driving jack to refill the outside of the left and right side wall plates of the open shield machine, and at the time of forward movement, this rotating plate is projected to the side of the shield machine so that its side end is close to the borehole wall and backfilled. The gist of the present invention is to divide the part and the front of the open shield machine by the rotary plate.

[0013]

According to the present invention, at the time of forward movement, the rotary plate is projected to the side of the shield machine and its side end is brought close to the wall of the borehole, and the backfill section and the front of the open shield machine are partitioned by the rotary plate. Therefore, the backfill soil on the outside of the left and right side wall plates of the open shield machine is not blocked by this rotating plate, bypasses the tips of the left and right side wall boards, and flows into the inside of the open shield machine.

[0014]

Embodiments of the present invention will now be described in detail with reference to the drawings. 1 is a cross-sectional plan view showing an embodiment of an open shield construction method and an open shield machine of the present invention, FIG.
Is a longitudinal side view of the same as above, and FIG. 3 is a partially enlarged transverse plan view, in which the same components as those in FIGS. 4 to 7 showing the conventional example are designated by the same reference numerals.

The open shield machine 1 includes left and right side wall plates 1.
A U-shaped shield machine having front, rear and upper surfaces formed of a and 1b and a bottom plate 1c having a length approximately the same as those of the side walls 1a and 1b and connecting the side plates 1a and 1b. It is the same as the conventional example that the propulsion jacks 3 are arranged side by side vertically in the vicinity and are arranged vertically and the pressing member 7 is provided at the rear end.

In the present invention, the tip portions of the left and right side wall plates 1a and 1b are
That is, the rotary plate 9 is hinged to the part of the blade opening 2 so as to project to the side of the open shield machine 1 along the vertical direction of the blade opening 2 of the left and right side wall plates 1a and 1b. .

The rotating plates 9 are of appropriate height and are vertically arranged. Each rotating plate 9 is a part of a plate 11 having a V-shaped cross section having a bending extension plate 10, and the bending extension plate 10 is Enter the inside of the shield machine 1 from the hinged part by the hinge 12.

Then, the driving jack 13 is attached to the shield machine 1
The inner end of the bending extension plate 10 is pin-connected to the rod of the driving jack 13. The driving jack 13 may be arranged along the inside of the left and right side wall plates 1a and 1b as shown in the drawing, or, although not shown, the left and right side wall plates 1a and 1b are composed of double walls. In some cases, it may be housed inside the hollow. The driving jack 13 is axially attached to the front and rear so that the driving jack 13 itself can rotate in the horizontal direction. At the front portion of this axial attachment, the rod of the driving jack 13 has the blade openings at the tips of the left and right side wall plates 1a and 1b. It projects from the portion 2 and is combined with the bending extension plate 10.

Next, an open shield construction method using the open shield machine 1 will be described. The general outline is the same as in the conventional example, the shield machine 1 is started from the start pit, the earth and sand are excavated from the front surface or the upper surface of the shield machine 1, and the soil is discharged to remove the first underground structure 4 The tail part 1d of the shield machine 1 is attached to the second underground structure 4 before.
Suspend inside. Hereinafter, the same excavation and setting process of the underground structure 4 is repeated to sequentially bury underground structures 4 in the underground, and backfilling is performed on the underground structure 4 at the rear to open shield machine 1. When reaches the reach pit, remove this and complete the construction.

In the open shield machine 1 as described above, backfilling 8 is performed in the gap between the excavation wall and the left and right side walls 1a and 1b as described above, but before or after the backfilling 8. , The driving jack 13 is operated to extend the rod.

As a result, the end of the bending extension plate 10 is pushed forward, the rotating plate 9 is opened to the side of the shield machine 1 and protrudes,
Its side edge approaches or abuts the borehole wall. as a result,
The rotating plate 9 separates the portion where the backfilling 8 is performed and the front of the open shield machine 1.

Even if the open shield machine 1 is moved forward in this state, since the rotary plate 9 is present, the earth and sand of the backfill 8 is blocked by the rotary plate 9 and bypasses the tips of the left and right side wall plates 1a and 1b to open. It does not flow inside the shield machine 1.

When the driving jack 13 is contracted, the end of the bending extension plate 10 is pulled by this and the rotary plate 9 is closed to return to the original state. However, when the ground is not a gravel layer, When the curve construction is not carried out even on the normal ground, there is no digging and there is no need for backfilling 8, so proceed in this state. At that time, the rotary plate 9 can also serve as blades of the left and right side wall plates 1a and 1b.

[0024]

As described above, the open shield method and the open shield machine of the present invention, when carrying out construction in a gravel layer or a curved construction, perform backfilling in a part of an overditch. It is possible to prevent the sediment from flowing inside the open shield machine.

[Brief description of drawings]

FIG. 1 is a cross-sectional plan view showing an embodiment of an open shield construction method and an open shield machine of the present invention.

FIG. 2 is a vertical sectional side view showing an embodiment of an open shield construction method and an open shield machine of the present invention.

FIG. 3 is a partially enlarged transverse plan view showing an embodiment of the open shield construction method and the open shield machine of the present invention.

FIG. 4 is a vertical sectional side view of a conventional open shield machine.

FIG. 5 is a cross-sectional plan view of a conventional open shield machine.

FIG. 6 is a vertical sectional side view showing an outline of an open shield construction method.

FIG. 7 is a cross-sectional plan view showing an outline of an open shield construction method.

[Explanation of symbols]

 1 ... Open shield machine 1a, 1b ... Side wall plate 1c ... Bottom plate 1d ... Tail part 2 ... Blade part 3 ... Propulsion jack 4 ... Underground structure 5 ... Backfilling 6 ... Start pit 7 ... Pressing member 8 ... Backfilling 9 ... Rotating plate 10 ... Refraction extension plate 11 ... Cross-section plate 12 ... Hinge 13 ... Driving jack 20 ... Grout material

Claims (3)

[Claims] 1. A process of arranging propulsion jacks inside left and right side wall plates, excavating and discharging earth and sand from the front or top opening of an open shield machine having front, rear and top openings, and extending the propulsion jack. Repeat the process of moving the shield machine forward by using the concrete box as a reaction force and the step of suspending and setting a new concrete box from the top behind the propulsion jack contracted in the tail part of the shield machine. In the open shield method of sequentially burying concrete boxes in vertical rows, the tip of the left and right side wall plates of the open shield machine is provided with a rotating plate that opens so as to project to the side of the shield machine along the vertical direction. The outside of the side wall plate is backfilled, and at the time of forward movement, this rotating plate is projected to the side of the shield machine so that its side end is close to the borehole wall and An open shield method characterized by dividing the front of the open shield machine with the rotating plate. 2. In an open shield machine in which propulsion jacks are arranged inside the left and right side wall plates and the front, rear and upper surfaces are opened, the tip ends of the left and right side wall plates are opened so as to project to the side of the shield machine. An open shield machine in which a rotating plate is axially attached along the vertical direction of the tip of the left and right side wall plates. 3. The rotating plate is a part of a plate having a V-shaped cross section having a bending extension plate, and the bending extension plate enters the inside of the shield machine from the shaft attachment portion and connects it to the driving jack. The open shield machine according to claim 2.