JP2679571B2 - Vertical shield method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vertical shield construction method.

[0002]

2. Description of the Related Art There are various methods for constructing a vertical shaft, and one of them is the vertical shield method recently.

[0003]

In this vertical shield construction method, it is necessary to construct a large-scale structure, which is not necessary originally, on the ground portion in order to receive the reaction force when the shield machine starts. There is a drawback that the vertical shaft is easily bent because it is pushed and installed.

[0004]

The present invention eliminates the drawbacks of the conventional method. (A) A pile is driven to a predetermined depth in the ground at the center of the shaft to be constructed, B)
A shield machine equipped with a gripping device composed of a pair of upper and lower grippers that can be freely opened and closed and a telescopic jack connecting the grippers,
(C) The expansion jack is extended with the upper gripper of the gripping device gripped and the lower gripper open, and then the lower gripper grips and the upper gripper grips. This is a vertical shield construction method characterized in that the shield machine is sequentially propelled by utilizing the pull-out resistance of the already staken piles as a reaction force by contracting the telescopic jack in the open state.

The first point of the present invention is that in order to receive a reaction force when the shield machine starts, instead of constructing a large-scale structure in the conventional method, a pile is driven. That is, a pile is first driven into the ground at the center of the shaft to be constructed. The depth of the driving is more than the depth of the vertical shaft to be constructed, but if it is considered that the pulling out drag force is insufficient as the reaction force at the start of the shield machine due to the ground, it is sufficient to drive deeper. Withdrawal resistance.

A second main point of the present invention is that the shield machine is provided with a gripping device, and the gripping device grips an already driven pile so that the shield machine can be propelled along the already driven pile. Is. This gripping device is composed of a pair of upper and lower grippers that can be opened and closed and a telescopic jack that connects the grippers, and the telescopic jack is extended with the upper gripper of the gripping device gripped and the lower gripper opened, and then By contracting the telescopic jack with the lower gripper gripping and the upper gripper being open, the shield machine is propelled downward by one stroke of the telescopic jack. The shield machine is sequentially propelled downward by repeating the gripping and opening of the gripper and the expansion and contraction of the telescopic jack.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.

FIG. 1 shows a gripping device 1B used in the present invention, (a) is a top view and (b) is a side view.

The gripper 1A is a ring which can be opened and closed with a hinge 2 as a fulcrum, and an opening portion of which is a gripping jack 5.
Are connected by Therefore, when the gripping jack 5 is contracted, the gripper 1A grips the already-mounted pile 3, and the gripping jack 5
When it is extended, the gripper 1A releases the already-mounted pile 3. Two grippers 1A are provided above and below, and the two grippers 1A are connected by two telescopic jacks 4 along the already-mounted pile 3. The lower gripper 1A is fixed to the shield machine 6. Since the gripping device 1B has such a configuration, the gripping jack 5 of the upper gripper 1A is contracted to grip the already-placed pile 3, and the gripping jack 5 of the lower gripper 1A is extended to attach the lower gripper 1A to the already-mounted pile 3. When the telescopic jack 4 is released further and the telescopic jack 4 is extended, the shield machine 6 is propelled downward by the extended length of the telescopic jack 4. In this way, by operating the gripping jack 5 and the telescopic jack 4, the shield machine 6 can be propelled along the existing piles 3 in a worm-type manner.

FIG. 2 shows an example of construction by the method of the present invention.

First, the pile 3 is driven to a predetermined depth.
(FIG. 2A) A shield machine 6 including necessary devices such as a gripping device 1B, a segment assembly jack 7, and an excavating cutter 9 is arranged around the pile 3. (FIG. 2 (b)) Several segments 8 are assembled on the segment assembly jack 7. This segment 8 is a pile 3 when the shield machine 6 starts
A weight may be used in place of the segment 8 because it also functions as a weight for reducing the force applied to the. (Figure 2
(C)) Excavating by the excavating cutter 9, and the gripping device 1B
Is operated to propel the shield machine 6 in a scaled manner, and the segment ring 8 assembled on the ground is sequentially lowered.
(FIG. 2 (d)) The segment ring 8 is constructed up to a predetermined depth, necessary materials are carried out of the shaft, and the construction is completed.

In this example, since the segment 8 is assembled on the ground and sequentially descended into the shaft, a lubricant may be supplied to the clearance between the natural ground and the segment 8 in order to smoothly descend. In addition, in order to prevent rattling due to the formation of a gap between the ground and the segment 8, the pile 3
It is preferable to provide a temporary guide that can be removed after construction between the and the segment ring 8. An example of a temporary guide is shown in FIG.
Shown in

Several spokes 11 are provided on the temporary guide 10 and the ends thereof are fixedly attached to the segments 8.

In this example, the excavation was performed by the excavating cutter 9 provided on the front surface of the shield machine 6, but another type of excavator may be used. May be promoted.

As the shield machine 6, an open type is usually used, but when there is a lot of spring water, the pile 3 and the shield machine 6 are used.
A closed type with a sealed gap is used.

4 and 5 show another example of assembling the segment ring 8 on the shield machine 6 side, which is another example of the method of the present invention.

FIG. 4 (a) shows a method of sequentially excavating and assembling segments while injecting a backfill material into the gap between the ground and the segment 8 to integrate the segment 8 and the ground. In FIG. 4B, an anchor 12 is provided on the segment 8 and the assembled segment 8 is attached to the anchor 1.
2 shows the method of progressively excavating and assembling segments while fixing them to the ground. FIG. 5 shows an example of assembling the segment 8 while preventing the existing segment ring 8 from slipping off. Grasping device 1 provided in the shield machine 6
The same structure as B, but an independent lifting device 14 is fixed to the pile 3 by gripping the pile 3 at an appropriate position of the pile 3, and the existing segment ring 8 above it is supported or simply supported. The hardware 13 is fixed to the pile 3, and the existing segment ring 8 above it is supported. At this time, the above-mentioned temporary guide 10 is attached to the existing segment ring 8 to be supported via the spokes 11.

Thus, in the method of the present invention,
Either a method of assembling the segment ring 8 on the ground to lower it, or a method of assembling the segment ring 8 on the side of the shield machine, which is the mainstream of the shield construction method, can be adopted.

When the shaft has a large depth, instead of first driving the pile to a predetermined depth, one pile is placed and the vertical shaft is constructed using the pile. A method may be adopted in which piles are added on the way and the construction of the vertical shaft is continued by using the piles that have been added.

[0020]

Since the reaction force at the time of starting the shield machine can be taken from the already staken piles, it is not necessary to construct a large-scale structure which is not necessary originally on the ground. In addition, since it is constructed along the existing piles, the vertical shaft will not bend.

[Brief description of the drawings]

1A and 1B show a gripping device used in the present invention, in which FIG. 1A is a top view and FIG. 1B is a side view.

FIG. 2 is a vertical cross-sectional view showing an example of a construction method for assembling segments on the ground according to the present invention, where (a) is the end of pile driving, (b) is the shield machine, and (c) is the shield machine. At the time of starting, (d) shows during construction.

3A and 3B show a temporary guide used in the present invention, in which FIG. 3A is a plan view and FIG. 3B is a vertical sectional view.

FIG. 4 is a vertical cross-sectional view showing an example of a construction method for assembling segments on the shield machine side of the present invention, in which (a) is an injection of backfill material, (b) is an anchor, and the existing segment is integrated with the ground. It is what makes it.

FIG. 5 is a vertical cross-sectional view showing another example of a construction method of assembling the segments on the shield machine side of the present invention, in which the temporary guides and the supporting hardware are used to assemble the segments while preventing the existing segments from sliding off. is there.

[Explanation of symbols]

1A ... Gripping device, 1B ... Gripping device, 2 ... Hinge, 3 ... Pile,
4 ... telescopic jack, 5 ... gripping jack, 6 ... shield machine, 7 ... segment assembly jack, 8 ... segment,
9 ... Excavator, 10 ... Temporary guide, 11 ... Spoke, 12 ... Anchor, 13 ... Support metal, 14 ... Lifting device, 15 ... Backfill material.

Claims (1)

(57) [Claims] 1. A structure in which (A) a pile is driven to a predetermined depth in the ground at the center of a vertical shaft to be constructed, and (B) a pair of upper and lower grippers that can be opened and closed and a telescopic jack that connects the grippers. A shield machine equipped with a gripping device that is arranged around the existing pile, and (C) the upper gripper of the gripping device grips,
Use the pull-out drag force of the existing pile as a reaction force by extending the telescopic jack when the lower gripper is open, then gripping by the lower gripper and contracting the telescopic jack when the upper gripper is open. The vertical shield method is characterized by sequentially promoting the shield machine.