JPH05302328A - Open type shield method and open type shield machine - Google Patents

Abstract

PURPOSE:To prevent such a trouble that backfilling soil flows into the inside of the title machine when the part of overexcavation is backfilled, in the case wherein execution in a gravel layer or at a curved part is done in the title method. CONSTITUTION:Vertically engaging grooves 9, each of which is opened at least above and outside, are respectively provided at the top end parts of side wall plates 1a, 1b, left and right, for the title machine 1. Partition plates 10, each of which is projected beyond the side part of the title machine 1, are separately dropped into these grooves 9 and are set, and backfilling 8 is done at the rear sides of the partion plates 10 and at the outsides of the side wall plates 1a, 1b therefor.

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, 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 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. 3 to 6, 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. The open shield machine 1 has the side walls 1a, 1b and the bottom plate 1c formed with the tips as blade openings 2.
Further, the propulsion jacks 3 are arranged vertically side by side near the center or near the rear ends of the side wall plates 1a and 1b.

Reference numeral 7 in the drawing 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 force 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
Set it behind the propelling 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. 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 move the shield machine 1 forward, so that the second underground structure 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.
Hereinafter, the same excavation and setting process of the underground structure 4 is repeated to sequentially embed the underground structure 4 in the column, and back-fill it 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 between the inside of the blade mouth 2 and the front portion, so the earth and sand at the blade front portion loosen and the ground is displaced. .. Then, when excavating the gravel layer, the earth and sand in the outer peripheral portion of the blade 2 is overexcavated, and the width of the excavation hole widens by that amount, and a gap is created between the excavation hole wall and the side walls 1a and 1b of the open shield machine 1. Will end up.

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 above-mentioned phenomenon of over-excavation occurs even when the open shield machine 1 is bent and excavated by curve construction even if it is not a gravel layer. 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 above-mentioned conventional example and to prevent the backfilled earth and sand from flowing into the inside of the open shield machine 1 when backfilling the overburden portion. To provide a shield method and an open shield machine.

[0012]

In order to achieve the above-mentioned object, the present invention provides a propulsion jack 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 move the shield machine forward, 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 and, the vertical engagement grooves that open at least upward and outward are provided at the tip of the left and right side wall plates of the open shield machine. The gist of the present invention is to set a partition plate projecting to the side of the shield machine into the groove by dropping it from above, and to backfill the outside of the left and right side wall plates of the open shield machine behind this partition plate.

[0013]

According to the present invention, at the time of advancing, a partition plate projecting to the side of the shield machine is dropped from the upper side in the engaging groove and set so that the side end is close to the wall of the borehole, and the backfill portion and the front side of the open shield machine are connected. Is partitioned by the partition plate, the backfill soil on the outside of the left and right side wall plates of the open shield machine is not blocked by the partition plate and bypasses the tips of the left and right side wall plates to flow 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.
3 is a vertical side view of the same, in which the same components as those in FIGS. 3 to 6 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 propulsion jack 3 near the center or the rear end of the side wall plates 1a, 1b with a U-shaped shield machine having front, rear, and upper faces formed by a and 1b and a bottom plate 1c connecting the side wall plates 1a, 1b. It is the same as the above-mentioned conventional example in that they are arranged vertically in the rearward direction and the pressing member 7 is provided at the rear end thereof.

According to the present invention, the left and right side wall plates 1a and 1b are provided with vertical engaging grooves 9 which are open at least upward and outward at the tips thereof, and the partition plates projecting to the side of the shield machine in the engaging grooves 9. 10 can be dropped from above to set.

A steel plate is suitable for the partition plate 10, and the groove width of the engaging groove 9 is slightly larger than the thickness of the partition plate 10.

Next, an open shield construction method using the open shield machine 1 will be described. The overall 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 are repeated to sequentially bury the underground structures 4 in a column, and backfill the rear underground structure 4 to open the 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 partition plate 10 is dropped into the engaging groove 9 from above and set, and the partition plate 10 is projected to the left and right sides of the open shield machine 1.

As a result, the partition plate 10 partially projects from the engagement groove 9 to the side of the shield machine 1, and the side end of the partition plate 10 approaches or abuts against the wall of the excavation hole. As a result, the partition plate 10 separates the portion where the backfilling 8 is performed and the front of the open shield machine 1.

Even when the open shield machine 1 is moved forward in this state, since the partition plate 10 is present, the earth and sand of the backfill 8 is blocked by this partition plate 10 and bypasses the tips of the left and right side wall plates 1a, 1b to open. It does not flow inside the shield machine 1.

When the ground is not a gravel layer,
When curve construction is not performed even on normal ground, since there is no overburden and backfilling 8 is not necessary, the partition plate 10 is pulled out from the engaging groove 9 and is advanced without the partition plate 10.

[0023]

The open shield construction method and the open shield machine of the present invention as described above, when performing backfilling in the overburden portion when performing construction in a gravel layer or curve construction, perform this backfilling. It is possible to prevent 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 vertical sectional side view of a conventional open shield machine.

FIG. 4 is a cross-sectional plan view of a conventional open shield machine.

FIG. 5 is a vertical sectional side view showing an outline of an open shield construction method.

FIG. 6 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 ... Engagement groove 10 ... Partition plate 20 ... Grout material

Claims (2)

[Claims] 1. A step of digging and discharging earth and sand in front of an opening or a front surface of an open shield machine having front, rear and upper surfaces provided with propulsion jacks inside right and left side wall plates, and extending the propulsion jack. Repeat the process of moving the shield machine forward 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 that has been compressed in the tail part of the shield machine. In the open shield construction method of sequentially burying concrete boxes in vertical rows, vertical engagement grooves that open at least upward and outward are provided at the tips of the left and right side wall plates of the open shield machine, and the shield machine is installed in these engagement grooves. Set the partition plate projecting to the side by dropping it from above and backfilling the outside of the left and right side wall plates of the open shield machine behind this partition plate. The characteristic open shield construction method. 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 open shield machine is opened upward and outward at least at the tip of the left and right side wall plates. An open shield machine characterized in that a vertical engaging groove is provided, and a partition plate projecting to the side of the shield machine can be dropped into the engaging groove from above to set.