JP3084476B2 - Open shield machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an open shield machine used in an open shield method for constructing underground structures such as water supply and sewerage and underground passages in an urban area.

[0002]

2. Description of the Related Art The open shield method is an efficient method utilizing the advantages of the open cutting method (open cut method) and the shield method, and the open shield machine 1 used in this open shield method is schematically shown in FIG. Left and right side walls 1a and bottom plate 1b connected to these side walls 1a
The front, rear and upper surfaces of the side wall 1a and the bottom plate 1b are formed as cutting edges, and the propulsion jack 2 is vertically moved toward the center or near the rear end of the side wall 1a. Arrange them side by side. In the figure, reference numeral 3 denotes a partition.

[0003] An open shield method using the open shield machine 1 is not shown in the drawings, but the open shield machine 1 is installed in a starting pit, and the propulsion jack 2 of the shield machine 1 is extended to start. The shield machine 1 was advanced by applying a reaction force to the reaction wall in the mine, and the first concrete box 4 forming the underground structure was suspended from above and shrunk in the tail portion 1c of the shield machine 1. Set behind the propulsion jack 2. A strut is provided between the propulsion jack 2 and the reaction force wall to adjust the distance as appropriate.

The starting pit is constituted by a retaining wall, and the retaining wall is partially mirror-cut in order to start the open shield machine 1. However, if necessary, a ground improvement is performed on a front portion of the starting pit by injecting a chemical solution or the like. May be given.

An excavator 9 such as a shovel excavates earth and sand from the front or upper surface of the open shield machine 1 and discharges the earth. Simultaneously with or after this earth removal step, the propulsion jack 2 is extended to move the open shield machine 1 forward. In the case of this advancing process, a pressing angle 8 composed of a frame using a box steel material or a mold steel is disposed in front of the concrete box 4.

[0006] The first concrete box 4
Before the second concrete box 4 is suspended in the tail part 1c of the shield machine 1. Hereinafter, the same earth removal process, advance process, and setting process of the concrete box 4 are appropriately repeated, and the concrete box 4 is sequentially left under the ground as the open shield machine 1 advances, and the concrete box 4 is further removed. Put backfill soil 5 on the upper surface of 4.

The concrete box 4 is connected to the shielding machine 1
When suspended in the tail portion 1c, a height adjusting member 7 made of a concrete block or the like is disposed below the concrete box 4, and in the tail portion 1c, the left and right and lower gaps of the concrete box 4 are provided. The grout material 6 is filled.

In this way, when the open shield machine 1 reaches the destination pit, it is removed and the construction is completed.

In such an open shield method, the concrete box 4 is connected to the open shield machine 1 as described above.
Left in the ground in tandem with the advance of
Is suspended in the tail portion of the shield machine 1, exits from the tail portion 1 c as the open shield machine 1 advances, and remains in the ground.

The concrete box 4 is made of reinforced concrete and comprises a left side plate 4a, a right side plate 4b, an upper floor plate 4c, and a lower floor plate 4d as shown in FIG. I have.

The upper part of the concrete boxes 4 which are out of the shield machine 1 and are arranged in a column form a groove until the backfill soil 5 is inserted, and a tail portion 1c is provided to prevent collapse of the side as much as possible. Side retaining plate 10 above the rear opening
a 'is extended.

The backfill soil 5 is put on the upper surface of the concrete box 4. In order to prevent the backfill soil 5 from being dislodged to the side of the open shield machine 1, as shown in FIG. Earth retaining plate 10b 'above the rear opening of 1c
Sometimes attached.

Among these retaining plates, the retaining plate 10b 'is located on the same plane as the opening surface of the tail portion 1c.
The side earth retaining plate 10a 'protrudes laterally from the rear part of the tail part 1c in the same direction as the traveling direction of the open shield machine 1, but is either integrated with the tail part 1c or fixed with bolts or the like. Have been.

[0014]

Problems to be Solved by the Invention Open Shield Machine 1
For example, the direction of excavation may be bent to avoid buried objects. In such a case, in particular, regarding the side earth retaining plate 10a 'projecting rearward of the open shield machine 1, since the side earth retaining plate 10a' is integrally fixed to the tail portion 1c, this side earth retaining plate 10a 'is provided. , The overall length of the open shield machine 1 becomes substantially longer, and it becomes difficult to make the open shield machine 1 curve and proceed.

Although the backfill soil 5 is prevented from flowing into the open shield machine 1 with a repose angle 5a as shown in FIG. 3, if the repose angle 5a is not ensured, the tail portion 1 is prevented.
Since only one earth retaining plate 10b 'is located on the same plane as the rear opening c, the earth retaining may not be sufficiently performed.

An object of the present invention is to solve the above-mentioned disadvantages of the prior art, and to provide an earth retaining plate protruding rearward of an open shield machine, to follow this bending when the open shield machine curves and proceeds. It is an object of the present invention to provide an open shield machine with good workability, which does not bend and does not hinder the advance of the open shield machine, and can completely prevent backfill soil from flowing out to the open shield machine side.

In order to achieve the above object, the present invention provides a first method.
In addition, a propulsion jack is arranged inside the left and right side wall boards,
In an open shield machine with open rear and upper surfaces,
Side retaining plates protruding from the upper portion of the rear opening of the tail portion in the rear extension direction of the left and right side wall plates are pivotally mounted on the tail portion so as to be rotatable, and end portions are provided between the side retaining plates on both sides. Is pivotally mounted on the beam member so that the beam member is permanently installed.

Secondly, a second earth retaining member is provided between the side earth retaining plates at a position parallel to and spaced from the first earth retaining plate disposed above the rear opening and flush with the opening surface. The gist of the present invention is to attach a plate detachably.

Third, a sealing material such as a rubber plate closely attached to the upper surface of the concrete box is attached to the lower part of the first and second retaining plates.

According to the first aspect of the present invention, since the side earth retaining plate is rotatably mounted on the tail portion, when the open shield machine curves and moves forward, it follows the side. The mounting angle of the retaining plate is also variable with respect to the tail. Therefore, the side earth retaining plate does not hinder the advance of the open shield machine.

Further, since the beam member provided between the side retaining plates has its ends rotatably attached to the side retaining plates,
This can be installed as a permanent one, and the angle of attachment to the side retaining plate can be changed following the bending of the side retaining plate on both sides, and the beam member prevents the bending of the side retaining plate There is no.

According to the second aspect of the present invention, the angle of repose of the backfill soil can be maintained by the second retaining plate disposed between the lateral retaining plates. Further, double earth retaining can be performed with the second earth retaining plate and the first earth retaining plate, so that the earth retaining can be reliably performed. And since the 2nd earth retaining plate can be removed freely, it does not get in the way when it is not necessary.

According to the third aspect of the present invention, since a sealing material such as a rubber plate closely attached to the upper surface of the concrete box is attached to the lower part of the first and second retaining plates, The backfill soil can be reliably prevented from entering the open shield machine.

[0024]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a longitudinal sectional side view of a main part showing an embodiment of the open shield machine of the present invention, FIG. 2 is a plan view partially cut away of the same, and the entire configuration of the open shield machine 1 has already been described with reference to FIGS. As described above, the propulsion jack 2 is disposed inside the left and right side wall plates 1a, and the front surface, the rear surface, and the upper surface are opened, so that detailed description is omitted here.

In the open shield machine 1 of the present invention, the side earth retaining plate 10a projecting from the upper portion of the rear opening of the tail portion 1c in the rear extension direction of the left and right side wall plates 1a is attached to the tail portion 1c.
A hinge 11 pivotally attaches to the left and right side wall plates 1a.

As shown in FIG. 2, a beam member 12 spans between the side earth retaining plates 10a on both sides. In this case, the receiving portion is formed on the side earth retaining plate 10a, and the end of the beam member is dropped into the receiving portion to be set detachably. As another embodiment, both ends of the beam member 12 are hinged to the side earth retaining plate 10a.
At 11, it may be rotatably mounted on a shaft, installed and permanently installed.

The distance between the first retaining plate 10b and the first retaining plate 10b disposed on the same plane as the opening surface above the rear surface opening of the tail portion 1c (in the illustrated example, about half the protruding length of the side retaining plate 10a). Position) and the second position between the side earth retaining plates 10a in the parallel position.
The earth retaining plate 10c was detachably attached. As a means for attachment and detachment, a U-shaped guide 14 is attached to the inner wall of the side earth retaining plate 10a so that it can be dropped vertically and pulled out freely.

Further, the first and second retaining plates 10b, 10c
A seal member 13 such as a rubber plate closely attached to the upper surface of the concrete box 4 was attached to the lower part of the box. The sealing member 13 is curved into a substantially L-shaped side surface, and the lower horizontal portion is in close contact with the upper surface of the concrete box 4.

The open shield method using such an open shield machine 1 is as shown in FIG. 3 as an outline of the entire construction method, and detailed description is omitted. By repeating the setting step of 4, the concrete box 4 is sequentially left under the ground as the open shield machine 1 advances, and the backfill soil 5 is put on the upper surface of the concrete box 4.

When the open shield machine 1 moves forward while making a curve, the side earth retaining plates 10a projecting rearward of the left and right side wall plates 1a are rotatably attached to the side wall plates 1a by hinges 11. Therefore, it turns at the hinge 11 and moves forward following the curve of the left and right side wall plates 1a. Therefore, both the left and right side wall plates 1a and the side earth retaining plates 10a smoothly advance, and the collapse of the earth and sand from the rear side of the open shield machine 1 can be reliably prevented.

Further, the second earth retaining plate 10c is dropped along the guide 14 between the side earth retaining plates 10a and set at an interval from the first earth retaining plate 10b. I do.
Then, sandbags and the like are put in the space between the first and second earth retaining plates 10b and 10c to reinforce the second earth retaining plate 10c. This prevents the backfill soil 5 behind the second earth retaining plate 10c from avalanche.

Then, the first and second retaining plates 10b, 10c
A sealing material such as a rubber plate is attached to the lower part of the concrete box, and its horizontal part is in close contact with the upper surface of the concrete box 4, so that the sealing at the sliding part is reliably performed, and the backfill soil 5 is From inside the open shield machine 1 from above.

[0033]

As described above, in the open shield machine of the present invention, first, since the side earth retaining plate is pivotally mounted on the tail portion, the open shield machine is curved and moves forward. Following this, the attachment angle of the side earth retaining plate with respect to the tail portion is also variable. Therefore, the side earth retaining plate does not hinder the advance of the open shield machine.

Also, the beam member provided between the side earth retaining plates is
If the end is rotatably attached to the side retaining plate, even if it is permanently provided, the angle of attachment to the side retaining plate follows the bending of the side retaining plate on both sides And the beam member does not hinder the bending of the side earth retaining plate.

The angle of repose of the backfill soil can be maintained by the second retaining plate disposed between the lateral retaining plates.
Further, since the second earth retaining plate and the first earth retaining plate can perform double earth retaining, the earth retaining can be reliably performed, and the second earth retaining plate can be freely removed. do not become.

Further, since a sealing material such as a rubber plate which is in close contact with the upper surface of the concrete box is attached to the lower portion of the second retaining plate, it is ensured that backfill soil enters the open shield machine from the upper surface of the concrete box. Can be prevented.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view showing a main part of an embodiment of an open shield machine of the present invention.

FIG. 2 is a partially cutaway plan view showing a main part of the embodiment of the open shield machine of the present invention.

FIG. 3 is a vertical sectional side view showing an outline of an open shield method.

FIG. 4 is a vertical sectional side view showing an outline of an open shield method using an open shield machine provided with a retaining plate.

FIG. 5 is a perspective view of a concrete box.

[Description of Signs] 1 ... Open shield machine 1a ... Side wall plate 1b ... Bottom plate 1c ... Tail part 2 ... Propulsion jack 3 ... Partition wall 4 ... Concrete box 4a ... Left wall plate 4b ... Right wall plate 4c ... Top floor plate 4d ... Bottom Floor plate 5 Backfill soil 5a Angle of repose 6 Grout material 7 Height adjustment material 8 Pushing angle 9 Excavator 10 Earth retaining plate 10a, 10a 'Side earth retaining plate 10b, 10b' First Earth retaining plate 10c ... Second earth retaining plate 11 ... Hinge 12 ... Beam member 13 ... Seal material 14 ... Guide 15 ... Opening

Claims (3)

(57) [Claims] 1. An open shield machine having a front jack, a rear face, and an upper face opened inside a left and right side wall plate, and protrudes from an upper portion of a rear opening of a tail portion in a rear extending direction of the left and right side wall plate. A side retaining plate is rotatably mounted on the tail portion, and an end portion is rotatably mounted between the side retaining plates on both sides, and a beam member is permanently installed. Open shield machine with special features. 2. A second retaining plate is provided between the side retaining plates at a position parallel to and spaced from the first retaining plate disposed above the rear opening and flush with the opening surface. The open shield machine according to claim 1, which is detachably attached. 3. The open shield machine according to claim 2, wherein a sealing material such as a rubber plate closely attached to the upper surface of the concrete box is attached to a lower portion of the first and second retaining plates.